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Products Home / Optical Elements / Optical Mirrors / Off-Axis Parabolic Mirrors / Off-Axis Parabolic Mirrors, Unprotected Gold Coating (0.8 - 20 µm)Off-Axis Parabolic Mirrors, Unprotected Gold Coating (0.8 - 20 µm)
- Unprotected Gold Coating for 800 nm - 20 µm
- Focus or Collimate Light without Spherical or Chromatic Aberrations
- SM-Threaded, Unthreaded, and Post-Mountable Adapters Provide Flexible Mounting Options
MPD399-M03
Ø3", RFL = 9"
MPD129-M03
Ø1", RFL = 2"
MPD019-M03
Ø1/2", RFL = 1"
SM2MP
SM2-Threaded
Mounting Adapter
Ø2" Off-Axis Parabola in
a KS3 Mirror Mount with an
MP508P1 Mounting Adapter
Please Wait
Click to Enlarge
After initial fabrication, all of our off-axis parabolic mirrors are finished on our single-point diamond turning machine. Visit our Custom Mirrors tab for more information.
Click to Enlarge
Engraving on Back of OAP Mirror
Features
- >97% Average Reflectance Over a Broadband Range from 800 nm to 20 µm
- Collimates a Diverging Source or Focuses a Collimated Beam without Spherical or Chromatic Aberrations
- Reflected Focal Lengths: 15 mm to 9" (228.6 mm)
- Surface Roughness: <100 Å (RMS)
- Clear Aperture: >90% of Diameter
- Three Kinds of Mounting Adapters for Ø1/2", Ø1", and Ø2" Mirrors:
- Externally SM-Threaded
- Unthreaded for Use in Mirror Mounts
- With 8-32 (M4) Taps for Post Mounting
- One Mounting Adapter for Ø3" Mirrors with External SM2 Threading and 8-32 Taps for Post Mounting
- Right-Angle Kinematic Mount for 30 mm Cage Systems and Ø1" OAP Mirrors
Thorlabs' Off-Axis Parabolic (OAP) Mirrors are first-surface mirrors which are segments of a parent paraboloid. They achromatically focus a collimated beam or collimate a divergent source, and their off-axis design separates the focal point from the rest of the beam path. The reflective design eliminates phase delays and absorption losses introduced by transmissive optics and makes these well suited for use with femtosecond pulsed lasers.
 Zemax Files |
|---|
| Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available. |
The angle between the focused beam and the collimated beam (off-axis angle) is 90°. As shown to the left, the collimated beam should be normal to the bottom of the substrate to achieve a proper focus. The diamond-turned parabolic surface has an unprotected gold coating which provides >97% average reflectance from 800 nm - 20 µm (see the Graphs tab for a plot of the coating performance). Unprotected gold offers higher reflectance than protected gold but is more delicate. Additionally, these mirrors can be used in applications where the polarization state needs to be strictly maintained or to prevent dispersion due to the overcoat of protected gold mirrors.
The OAP mirrors sold here are fabricated using aluminum substrates. The bottom of each mirror has three tapped mounting holes in a triangle pattern and an alignment hole for use with a mounting adapter (see the Mounting Adapters tab for more details). The non-optical surfaces are black-anodized and laser-engraved with the item number for easy identification as shown in the image to the right.
Care and Handling
The gold layer on unprotected mirrors does not include a protective overcoat. Bare gold does not oxidize in air, but can be easily damaged by fingerprints, aerosols, or the slightest contact with any abrasive material. Unprotected gold mirrors should only be handled when necessary and always held by the sides. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the surface. No attempt should be made to clean the surface other than blowing off dust with clean, dry air or nitrogen. Any other cleaning method may damage the surface.
| Off-Axis Parabolic Mirrors Selection Guidea | |||||
|---|---|---|---|---|---|
| Mirror Coating (See Graphs Tab for Reflectance) |
Wavelength Range |
 90° Off-Axis |
 15°, 30°, 45°, 60° Off-Axis |
 90°, Hole Parallel to Focused Beam |
 90°, Hole Parallel to Collimated Beam |
| UV-Enhanced Aluminum | 250 nm - 450 nm |  |
Customb | ||
| Protected Aluminum | 450 nm - 20 µm | |
|||
| Protected Silver | 450 nm - 20 µm | |
|
|
Customb |
| Protected Gold | 800 nm - 20 µm | |
|
|
|
| Unprotected Gold | 800 nm - 20 µm | |
Customb | |
|
- To view the product presentation for each of our stocked off-axis parabolic mirrors, click the blue check icon (
). - We can manufacture off-axis parabolic mirrors with a variety of coatings, features, and off-axis angles. To request a quote for a custom mirror, please contact Tech Support.
| Common Specifications | ||
|---|---|---|
| Metallic Coating | Unprotected Gold | |
| Reflectance (Average) | >97% from 800 nm to 20 µm | |
| Off-Axis Angle | 90° | |
| Clear Aperture | >90% of Diametera | |
| Surface Roughness (RMS) | <100 Å | |
| Surface Quality | 40-20 Scratch-Dig | |
| Parent Focal Length Tolerance | ±1% | |
| Reflected Focal Length Tolerance | ±1% | |
| Substrate | Aluminum | |
| Manufacturing Process | Diamond Turned | |
| Item # | Diametera | Thicknessa | RFLa,b | PFLa,c | Reflected Wavefront Error (RMS) |
Bottom Mounting Holes |
|---|---|---|---|---|---|---|
| MPD00M9-M03 | 1/2" (12.7 mm) | 20.0 mm (0.79") | 15.0 mm (0.59") | 7.5 mm (0.30") | <λ/4 at 633 nm | 4-40 Taps in Radial Pattern (3 Places) |
| MPD019-M03 | 1/2" (12.7 mm) | 0.74" (18.8 mm) | 1" (25.4 mm) | 1/2" (12.7 mm) | ||
| MPD01M9-M03 | 1/2" (12.7 mm) | 20.0 mm (0.79") | 33.0 mm (1.30") | 16.5 mm (0.65") | ||
| MPD029-M03 | 1/2" (12.7 mm) | 0.74" (18.8 mm) | 2" (50.8 mm) | 1" (25.4 mm) | ||
| MPD039-M03 | 1/2" (12.7 mm) | 0.74" (18.8 mm) | 3" (76.2 mm) | 1.5" (38.1 mm) | ||
| MPD119-M03 | 1" (25.4 mm) | 1.25" (31.7 mm) | 1" (25.4 mm) | 1/2" (12.7 mm) | <λ/2 at 633 nm | |
| MPD129-M03 | 1" (25.4 mm) | 1.25" (31.7 mm) | 2" (50.8 mm) | 1" (25.4 mm) | <λ/4 at 633 nm | |
| MPD139-M03 | 1" (25.4 mm) | 1.25" (31.7 mm) | 3" (76.2 mm) | 1.5" (38.1 mm) | ||
| MPD149-M03 | 1" (25.4 mm) | 1.25" (31.7 mm) | 4" (101.6 mm) | 2" (50.8 mm) | ||
| MPD169-M03 | 1" (25.4 mm) | 1.25" (31.7 mm) | 6" (152.4 mm) | 3" (76.2 mm) | ||
| MPD189-M03 | 1" (25.4 mm) | 1.25" (31.7 mm) | 8" (203.2 mm) | 4" (101.6 mm) | ||
| MPD229-M03 | 2" (50.8 mm) | 2.47" (62.8 mm) | 2" (50.8 mm) | 1" (25.4 mm) | <λ/2 at 633 nm | 8-32 Taps in Radial Pattern (3 Places) |
| MPD239-M03 | 2" (50.8 mm) | 2.47" (62.8 mm) | 3" (76.2 mm) | 1.5" (38.1 mm) | ||
| MPD249-M03 | 2" (50.8 mm) | 2.47" (62.8 mm) | 4" (101.6 mm) | 2" (50.8 mm) | <λ/4 at 633 nm | |
| MPD269-M03 | 2" (50.8 mm) | 2.47" (62.8 mm) | 6" (152.4 mm) | 3" (76.2 mm) | ||
| MPD399-M03 | 3" (76.2 mm) | 3.47" (88.2 mm) | 9" (228.6 mm) | 4.5" (114.3 mm) | <λ/2 at 633 nm |
The shaded region in the graph below denotes the ranges over which we guarantee the specified reflectance. Please note that the reflectance outside of this band is typical and can vary from lot to lot, especially in out-of-band regions where the reflectance is fluctuating or sloped.
The bottom of each off-axis parabolic (OAP) mirror contains three tapped mounting holes in a triangle pattern and an alignment hole. These holes are used to attach our Mounting Adapters, which contain three corresponding counterbore holes or captive screws and an alignment pin (see the image to the right). Together, these features allow our OAP mirrors to be securely mounted. The tapped holes are also useful in OEM applications.
We offer three types of mounting plates for Ø1/2", Ø1", and Ø2" OAP mirrors. The first type is designed to be mounted in any Ø1", Ø2", or Ø3" mirror mount, depending upon the diameter of the OAP mirror. The second type, designed for post mounting, contains an 8-32 (M4) tapped hole on all four sides for direct mechanical compatibility with Ø1/2" Posts. The third type is externally SM threaded for direct compatibility with any of our internally SM-threaded components, such as our rotation mounts. For Ø1" 90° OAP mirrors, the KCB1P(/M) right-angle mount allows for cage system integration. The table below shows all of these options.
Our Ø1/2", Ø1", and Ø2" OAP mirrors can also be adapted to our SM threads by placing them into our SM Thread to Double Bore Adapters. This type of adapter allows rotation of the OAP mirror with respect to the adapter prior to securing its position, whereas when using the SM-threaded adapters offered on this page, the final location of the OAP mirror is dictated either by the threads themselves (when fully threaded into a mount) or by using the provided retaining ring to secure it in place.
For Ø3" OAP mirrors, we offer the SM2MP3 mounting adapter, which contains four 8-32 tapped holes for post mounting and has external SM2 threading for mounting in our SM2-threaded components, such as the K6X2 6-axis kinematic mount.
Alternatively, all of our OAP mirrors may be directly mounted in our Precision Kinematic Mirror Mounts using their outer diameter.
| OAP Mirror Mounting Adapters | |||||
|---|---|---|---|---|---|
| Adapter Type | Example Photo (Click to Enlarge) |
OAP Mirror Diameter | |||
| 1/2" | 1" | 2" | 3" | ||
| Smooth Bore |  |
MP127P1 For Ø1" Mounts |
MP254P1 For Ø2" Mounts |
MP508P1a For Ø3" Mounts |
- |
| Post Mounting |  |
MP127P2(/M) 8-32 (M4) Taps |
MP254P2(/M) 8-32 (M4) Taps |
MP508P2(/M)a 8-32 (M4) Taps |
SM2MP3 8-32 Taps |
| SM-Threaded |  |
SM05MP External SM05 (0.535"-40) |
SM1MP External SM1 (1.035"-40) |
SM2MPa External SM2 (2.035"-40) |
SM2MP3 External SM2 (2.035"-40) |
| Right-Angle OAP Mirror Mount |
 |
- | KCB1P(/M) 30 mm Cage Compatible 1/4"-20 (M6) Tap |
- | - |
Selecting a Mirror Based on Desired Output Beam Diameter
When using an off-axis parabolic mirror to collimate a point source, selection of the appropriate mirror is often done based on the desired output beam diameter. Beam diameter can be calculated using the divergence half-angle of the incident light (Θ) and the reflected focal length of the OAP. To calculate the beam diameter in the small angle approximation, use the following equation:
Beam Diameter = 2 x sin(Θ) x Reflected Focal Length
If you are collimating from a fiber, the equation can be rewritten as:
Beam Diameter = 2 x NA (Fiber) x Reflected Focal Length
The table below lists the output beam diameter as a function of the reflected focal length of the mirror and the divergence half-angle of the incident light. Not listed here is the diameter of the OAP mirror. The clear aperture of the OAP mirror you select should be larger than the desired beam output diameter.
| Reflected Focal Length | Beam Diameter | |||
|---|---|---|---|---|
| 2.5° Source Divergence | 5° Source Divergence | 7.5° Source Divergence | 10° Source Divergence | |
| 15.0 mm (0.59") | 1.3 mm | 2.6 mm | 3.9 mm | 5.2 mm |
| 1" (25.4 mm) | 2.2 mm | 4.4 mm | 6.6 mm | 8.8 mm |
| 33.0 mm (1.30") | 2.9 mm | 5.8 mm | 8.6 mm | 11.5 mm |
| 2" (50.8 mm) | 4.4 mm | 8.9 mm | 13.3 mm | 17.6 mm |
| 3" (76.2 mm) | 6.6 mm | 13.3 mm | 19.9 mm | 26.5 mm |
| 4" (101.6 mm) | 8.9 mm | 17.7 mm | 26.5 mm | 35.3 mm |
| 6" (152.4 mm) | 13.3 mm | 26.6 mm | 39.8 mm | 52.9 mm |
| 8" (203.2 mm) | 17.7 mm | 35.4 mm | 53.0 mm | 70.6 mm |
| 9" (228.6 mm) | 19.9 mm | 39.8 mm | 59.7 mm | 79.4 mma |
Custom Off-Axis Parabolic (OAP) and Aspheric Mirrors
Key Capabilities
- Nanotech® 450UPL Ultra Precision 3-Axis CNC Diamond Turning Lathe for Individual Custom Mirrors
- Custom Sizes, Focal Lengths, Substrates, Coatings, and Clearance Holes
- Off- and On-Axis Parabolic, Conical, and Toroidal Mirrors
- Biconic Surfaces and Irregular Aspheric Optics
Thorlabs' advanced single-point diamond turning capabilities allow us to produce custom OAP and aspheric mirrors in small quantities. We can produce long focal length and large diameter optics, as well as optics with custom shapes.
Click to Enlarge
We offer OAP mirrors with custom sizes, focal lengths, substrates, coatings, and clearance holes.
In addition to our stock off-axis parabolic (OAP) mirrors, Thorlabs is also capable of manufacturing a variety of custom aspheric mirrors. Our unique single-point diamond turning (SPDT) capabilities allow us to produce these customs in low quantities at prices that are comparable with our stock offerings. As shown in the video to the right, we engage the slow-slide-servo process of our SPDT machine to polish individual off-axis mirrors by synchronizing the rotational position of the spindle with the linear position of the translation axes.
Click to Enlarge
Toroidal mirrors have two different radii of curvature and are used to image off-axis points without introducing astigmatism.
Click to Enlarge
Conical mirrors provide 360° of illumination.
This unique manufacturing capability allows us to provide OAP mirrors with custom reflected focal lengths and diameters, including long-focal-length and large-diameter optics that cannot be produced by conventional two-axis machining. In addition, we can produce OAP mirrors with a variety of custom substrates (including copper), custom coatings, and custom hole sizes and shapes. The use of copper substrates and other advanced techniques also allow us to offer OAP mirrors with enhanced finishes that exhibit less surface roughness than our our stock products, resulting in improved wavefront quality.
Our SPDT competency also enables us to produce mirrors with other custom biconic surfaces and aspheric shapes, including on-axis parabolic, conical, and toroidal mirrors. These custom mirror shapes can be used in a wide variety of optical instruments and specialized imaging systems. For example, toroidal mirrors, which are used to image off-axis points without introducing astigmatism, are commonly used in compact Czerny-Turner monochromators. Conical mirrors, on the other hand, are ideal for non-imaging applications that require 360° of uniform illumination.
We are generally able to produce custom OAP mirrors and aspheric mirrors with short lead times. For modifications to an existing part, delivery in 4-6 weeks is standard. For custom shapes and long focal length optics, a 6-8 week lead time is typical. To receive more information or a quote for a custom optic, please contact Tech Support.
Our engineers are available to help manufacture optics for your application.
Customs are available in low quantities at prices that are comparable with our stock catalog products.
Please contact techsupport@thorlabs.com with your custom optic requests.
Insights into Off-Axis Parabolic Mirrors
Scroll down to read about the unique properties of off-axis parabolic (OAP) mirrors and how to take advantage of them:
- Focus Collimated Light / Collimate Light from a Point Source
- Benefits of Pairing OAP Mirrors
- Mounting and Aligning an OAP Mirror
Click here for more insights into lab practices and equipment.
Focus Collimated Light / Collimate Light from a Point Source
Parabolic and off-axis parabolic (OAP) mirrors will only provide the expected well-collimated beam or diffraction-limited focal spot when the correct beam type is incident along the proper axis. This due to the parabolic shape of these mirrors' reflective surfaces, which are not symmetric around their focal points.
Parabolic vs. Off-Axis Parabolic Mirrors
The reflective surface of an OAP mirror is a section of the parent parabola that is not centered on the parent's optical axis (Figure 1). A conventional parabolic mirror is illustrated in Figure 2.
The optical axis of an OAP mirror is parallel to, but displaced from the optical axis of the parent parabola. The focal point of the OAP mirror coincides with that of the parent parabola.
The focal axis of the OAP mirror passes through the focal point and the center of the OAP mirror. The focal and optical axes of an OAP mirror are not parallel. In contrast, these axes coincide for parabolic mirrors whose reflective surfaces are centered on optical axis of the parent parabola.
Focus Collimated Light
If a parabolic or OAP mirror is being used to focus a beam of collimated light to a diffraction-limited point, the light must be directed along the mirror's optical axis (Figures 1 and 2).
Collimated light that is not directed parallel to the optical axis will not focus to a unique point (Figure 3).
Thorlabs recommends against directing collimated light along the focal axis of OAP mirrors, or along any direction that is not parallel to the optical axis, since the light will not focus to a diffraction-limited spot.
Collimate Light from a Point Source
To obtain highly collimated light from a point source, the point source should be located at the mirror's focal point.
Light from a point source will be poorly collimated if the point source is placed along the OAP mirror's optical axis, or anywhere else that is not the focal point.
An OAP mirror can also be used to collimate a spherical wave, if its origin coincides with the focal point of the mirror.
Click to Enlarge
Figure 3: When the collimated beam is not directed along the mirror's optical axis, the mirror does not provide a diffraction-limited spot. Instead, the focal region is spread out.
Click to Enlarge
Figure 2: When the collimated beam is parallel to the optical axis of a parabolic or OAP mirror, the light focuses to a diffraction-limited spot.
Click to Enlarge
Figure 1: The focal and optical axes of an OAP mirror do not coincide and are not parallel.
Date of Last Edit: Dec. 4, 2019
Benefits of Pairing OAP Mirrors
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Figure 5: A pair of OAP mirrors can be used to couple light out of one fiber and into another. This provides access to the beam when it is necessary to insert bulk optics into the optical path. Due to the small dimension of the fiber core, light emitted from the fiber end face is similar to a point source.
Click to Enlarge
Figure 4: A pair of OAP mirrors can be used in imaging applications, and/or to relay a beam across a distance.
Relay an Image
A single OAP mirror is not recommended for finite conjugate imaging applications, when neither light beam is collimated, but a pair of OAP mirrors can successfully be used for this purpose. An example setup is illustrated in Figure 4.
The dual OAP configuration facilitates the process of adjusting the distance between mirrors. The leg of collimated light is also convenient for inserting filters and other optical elements into the beam. Another benefit is that distance between the two mirrors can be adjusted to move the focal point across the source and/or target planes without disturbing the alignment of the system.
Provide Access to the Beam in a Fiber Network
A pair of OAP mirrors can be used to create a free-space leg in an optical fiber system, which is one way to provide access to the light beam. The illustration in Figure 5 shows an example of this configuration, which can be useful when filters or other bulk optics need to be inserted into the beam path. The length of the free-space leg can be adjusted without disturbing alignment.
When setting up this system, the fibers' end faces must be aligned so that their cores coincide with the source and target focal points, respectively. The collimated beam paths of both mirrors should be co-linear and completely overlapping.
This configuration is the basis for fiber optic filter / attenuator mounts.
Date of Last Edit: Dec. 4, 2019
Mounting and Aligning an OAP Mirror
Click to Enlarge
Figure 7: When using an OAP mirror to collimate a point source, a shear plate interferometer placed in the output beam can facilitate the alignment process.
Click to Enlarge
Figure 6: The shape of the OAP mirror's reflective profile matches a section of the parent parabola that is not centered on the focal point. Due to this, the OAP's reflective surface is not rotationally symmetric. When mounting the mirror, care should be taken to ensure the mirror does not rotate around its optical axis.
OAP mirrors are not rotationally symmetric. This is due to their reflective surfaces being taken from sections of the parent parabola curve located away from the focal point (Figure 6).
Due the asymmetry of the reflector, when an OAP mirror rotates, the position of its focal point also rotates. Since this could negatively impact the performance of an optical system, the mirror should be fixed so that the reflective surface cannot rotate around its optical axis.
The optical performance of the mirror is also sensitive to alignment drift with respect to the other five degrees of freedom. One way to protect against alignment drift is to use a fixed, rather than a kinematic, mount.
Using a shear plate interferometer can be helpful when aligning an OAP mirror to an input point source. The shear plate interferometer should intercept the output beam (Figure 7), to assess its collimation quality. Alignment is optimized when the quality of the collimated beam is optimized.
Date of Last Edit: Dec. 4, 2019
| Posted Comments: | |
Jaka Mur
(posted 2020-06-02 12:58:42.843) Dear Sir or Madam,
I would like to know if these protected gold parabolic mirrors are suitable for use with 1030 nm (and/or 1064 nm) laser sources when submerged into water.
- What happens to reflectivity due to the protective coating/water interface?
- Is the coating resistant to water submersion?
Best regards,
Jaka Mur nbayconich
(posted 2020-06-02 06:25:04.0) Thank you for contacting Thorlabs. While the coating should remain highly reflective underwater, we do not recommend submerging our coatings. |
Zoom
| Item # | Diametera | RFLa | PFLa | Thicknessa | Off-Axis Angle |
RWE (RMS) |
Mounting Holesb |
|---|---|---|---|---|---|---|---|
| MPD00M9-M03 | 1/2" (12.7 mm) |
15.0 mm (0.59") |
7.5 mm (0.30") |
20.0 mm (0.79") |
90° | <λ/4 at 633 nm |
Three 4-40 Taps on Bottom |
| MPD019-M03 | 1/2" (12.7 mm) |
1" (25.4 mm) |
1/2" (12.7 mm) |
0.74" (18.8 mm) |
|||
| MPD01M9-M03 | 1/2" (12.7 mm) |
33.0 mm (1.30") |
16.5 mm (0.65") |
20.0 mm (0.79") |
|||
| MPD029-M03 | 1/2" (12.7 mm) |
2" (50.8 mm) |
1" (25.4 mm) |
0.74" (18.8 mm) |
|||
| MPD039-M03 | 1/2" (12.7 mm) |
3" (76.2 mm) |
1.5" (38.1 mm) |
0.74" (18.8 mm) |
Care and Handling
The gold layer on unprotected mirrors does not include a protective overcoat. Bare gold does not oxidize in air, but can be easily damaged by fingerprints, aerosols, or the slightest contact with any abrasive material. Unprotected gold mirrors should only be handled when necessary and always held by the sides. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the surface. No attempt should be made to clean the surface other than blowing off dust with clean, dry air or nitrogen. Any other cleaning method may damage the surface.
Zoom
| Item # | Diametera | RFLa | PFLa | Thicknessa | Off-Axis Angle |
RWE (RMS) |
Mounting Holesb |
|---|---|---|---|---|---|---|---|
| MPD119-M03 | 1" (25.4 mm) |
1" (25.4 mm) |
1/2" (12.7 mm) |
1.25" (31.7 mm) |
90° | <λ/2 at 633 nm | Three 4-40 Taps on Bottom |
| MPD129-M03 | 1" (25.4 mm) |
2" (50.8 mm) |
1" (25.4 mm) |
1.25" (31.7 mm) |
<λ/4 at 633 nm | ||
| MPD139-M03 | 1" (25.4 mm) |
3" (76.2 mm) |
1.5" (38.1 mm) |
1.25" (31.7 mm) |
|||
| MPD149-M03 | 1" (25.4 mm) |
4" (101.6 mm) |
2" (50.8 mm) |
1.25" (31.7 mm) |
|||
| MPD169-M03 | 1" (25.4 mm) |
6" (152.4 mm) |
3" (76.2 mm) |
1.25" (31.7 mm) |
|||
| MPD189-M03 | 1" (25.4 mm) |
8" (203.2 mm) |
4" (101.6 mm) |
1.25" (31.7 mm) |
Care and Handling
The gold layer on unprotected mirrors does not include a protective overcoat. Bare gold does not oxidize in air, but can be easily damaged by fingerprints, aerosols, or the slightest contact with any abrasive material. Unprotected gold mirrors should only be handled when necessary and always held by the sides. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the surface. No attempt should be made to clean the surface other than blowing off dust with clean, dry air or nitrogen. Any other cleaning method may damage the surface.
Zoom
Click to Enlarge
Ø2" Unprotected Gold OAP Mirror Mounted to a Ø1/2" Post Using an MP508P2 Threaded Adapter Plate
| Item # | Diametera | RFLa | PFLa | Thicknessa | Off-Axis Angle |
RWE (RMS) |
Mounting Holesb |
|---|---|---|---|---|---|---|---|
| MPD229-M03 | 2" (50.8 mm) |
2" (50.8 mm) |
1" (25.4 mm) |
2.47" (62.8 mm) |
90° | <λ/2 at 633 nm | Three 8-32 Taps on Bottom |
| MPD239-M03 | 2" (50.8 mm) |
3" (76.2 mm) |
1.5" (38.1 mm) |
2.47" (62.8 mm) |
|||
| MPD249-M03 | 2" (50.8 mm) |
4" (101.6 mm) |
2" (50.8 mm) |
2.47" (62.8 mm) |
<λ/4 at 633 nm | ||
| MPD269-M03 | 2" (50.8 mm) |
6" (152.4 mm) |
3" (76.2 mm) |
2.47" (62.8 mm) |
Care and Handling
The gold layer on unprotected mirrors does not include a protective overcoat. Bare gold does not oxidize in air, but can be easily damaged by fingerprints, aerosols, or the slightest contact with any abrasive material. Unprotected gold mirrors should only be handled when necessary and always held by the sides. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the surface. No attempt should be made to clean the surface other than blowing off dust with clean, dry air or nitrogen. Any other cleaning method may damage the surface.
Zoom
| Item # | Diametera | RFLa | PFLa | Thicknessa | Off-Axis Angle |
RWE (RMS) |
Mounting Holesb |
|---|---|---|---|---|---|---|---|
| MPD399-M03 | 3" (76.2 mm) |
9" (228.6 mm) |
4.50" (114.3 mm) |
3.47" (88.2 mm) |
90° | <λ/2 at 633 nm | Three 8-32 Taps on Bottom |
Care and Handling
The gold layer on unprotected mirrors does not include a protective overcoat. Bare gold does not oxidize in air, but can be easily damaged by fingerprints, aerosols, or the slightest contact with any abrasive material. Unprotected gold mirrors should only be handled when necessary and always held by the sides. Latex gloves or a similar protective covering should be worn to prevent oil from fingers from reaching the surface. No attempt should be made to clean the surface other than blowing off dust with clean, dry air or nitrogen. Any other cleaning method may damage the surface.
Zoom
- Contain Three #4 Counterbores and an Alignment Pin for Mounting to Ø1/2" OAP Mirrors
- SM05MP: Diameter is Externally SM05 Threaded
- MP127P1: Designed to Fit into Ø1" Mirror Mounts
- MP127P2(/M): Post Mountable in Four Orientations
Our Mounting Adapters for Ø1/2" Off-Axis Parabolic Mirrors provide mounting alternatives to our smooth bore kinematic mirror mounts. Each contains three #4 counterbores that are positioned to align with the 4-40 tapped holes on our Ø1/2" OAP mirrors. Three 4-40 cap screws and the required 3/32" hex key are provided with each adapter.
SM05MP
The SM05MP OAP Mirror Adapter is externally SM05 threaded (0.535"-40), which allows a Ø1/2" OAP mirror to be directly mounted to an internally SM05-threaded component. The adapter is designed to allow easy adaptability to a 16 mm cage system as well as SM05-threaded mirror, translation, and rotation mounts. The included SM05RR retaining ring secures the adapter in place when it is threaded into a mount. An SPW603 Spanner Wrench can be used to tighten the retaining ring against the OAP mirror housing.
MP127P1
The unthreaded MP127P1 OAP Mirror Adapter is sized to fit inside a Ø1" mirror mount, such as the KS1 Mirror Mount shown above.
MP127P2(/M)
The MP127P2(/M) OAP Mirror Adapter contains four 8-32 (M4) taps for post mounting that orient the OAP mirror at right angles. The distance from the center of the optic to the edge of the mount in the MP127P2 is 1/2" (12.5 mm), allowing for standardized optical axis heights when used with a fixed height post, such as our Ø1" Posts. Please note that the MP127P2(/M) is not compatible with Ø1" mirror mounts, and is instead designed for post mounting.
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- Contain Three #4 Counterbores and an Alignment Pin for Mounting to Ø1" OAP Mirrors
- SM1MP: Diameter is Externally SM1 Threaded
- MP254P1: Designed to Fit into Ø2" Mirror Mounts
- MP254P2(/M): Post Mountable in Four Orientations
- KCB1P(/M): Right-Angle Kinematic Mount
Our Kinematic Right-Angle Mount and Mounting Adapters for Ø1" Off-Axis Parabolic Mirrors provide mounting alternatives to our smooth bore kinematic mirror mounts. Each offers three #4 counterbores that are positioned to align with the 4-40 tapped holes on our Ø1" OAP mirrors.
SM1MP
The SM1MP OAP Mirror Adapter is externally SM1 threaded (1.035"-40) which allows a Ø1" OAP mirror to be directly mounted to an internally SM1-threaded component. The adapter is designed to allow easy adaptability to a 30 mm cage system as well as SM1-threaded mirror, translation, and rotation mounts. The included SM1RR retaining ring secures the adapter in place when it is threaded into a mount. An SPW606 and a SPW909 or SPW801 Spanner Wrench can be used to thread the retaining ring and adapter, respectively. Three 4-40 cap screws and the required 0.05" hex key are provided with each adapter.
MP254P1
The unthreaded MP254P1 OAP Mirror Adapter is sized to fit inside a Ø2" mirror mount, such as the KS2 Mirror Mount shown above. Three 4-40 cap screws and the required 3/32" hex key are provided with each adapter.
MP254P2(/M)
The MP254P2(/M) OAP Mirror Adapter contains four 8-32 (M4) taps for post mounting that orient the OAP mirror at right angles. The distance from the center of the optic to the edge of the mount in the MP254P2 is 1" (25.4 mm), allowing for standardized optical axis heights when used with a fixed height post, such as our Ø1" Posts. Please note that the MP254P2(/M) is not compatible with Ø2" mirror mounts, and is instead designed for post mounting. Three 4-40 cap screws and the required 3/32" hex key are provided with each adapter.
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KCB1P Mount is Compatible with 30 mm Cage Systems and SM1 Lens Tubes
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KCB1P Mounting Plate and Housing Body Shown with Ø1" Off-Axis Parabolic Mirror
KCB1P(/M)
The KCB1P(/M) Right-Angle Kinematic Mount provides ±4° of pitch and yaw adjustment for a Ø1" off-axis parabolic (OAP) mirror mounted on a plate that positions the surface of the mirror at a 45° angle. The ports are SM1 threaded (1.035"-40) for compatibility with our SM1 Lens Tubes and each face has four Ø6 mm smooth bore holes for compatibility with the ER rods for our 30 mm Cage System. The top and bottom of the mount also offer 1/4"-20 (M6) mounting holes for compatibility with Ø1/2" and Ø1" Posts.
The rear-loading, removable mounting plate features our ball and V-groove design that allows it to be precisely kinematically positioned on the body of the mount. The rear-loading design ensures that the optic remains accessible even after the mount is fitted with cage rods or lens tubes.
For more information on KCB1P(/M) Mount, see the full web presentation.
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Ø2" OAP Mirror with Hole Parallel to Focused Beam Mounted on a Ø1/2" Post
Using an MP508P2 Adapter
- Contain Three #8 Counterbores and an Alignment Pin for Mounting to Ø2" OAP Mirrors
- SM2MP: Diameter is Externally SM2 Threaded
- MP508P1: Designed to Fit into Ø3" Mirror Mounts
- MP508P2(/M): Post Mountable in Four Orientations
Our Mounting Adapters for Ø2" Off-Axis Parabolic Mirrors provide mounting alternatives to our smooth bore kinematic mirror mounts. Each contains three #8 counterbores that are positioned to align with the 8-32 tapped holes on our Ø2" OAP Mirrors. Please note that these adapters will block the through holes on OAP Mirrors with holes parallel to the collimated beam. Our smooth bore mounting adapters can be used to mount these parts.
SM2MP
The SM2MP OAP Mirror Adapter is externally SM2 threaded (2.035"-40), which allows a Ø2" OAP mirror to be directly mounted to an internally SM2-threaded component. The adapter is designed to allow easy adaptability to a 60 mm cage system as well as SM2-threaded mirror, translation, and rotation mounts. The included SM2RR retaining ring secures the adapter in place when it is threaded into a mount. An SPW604 and SPW801 Spanner Wrench can be used to thread the retaining ring and adapter, respectively. Three low profile 8-32 cap screws and the required 5/64" hex key are provided with each adapter.
MP508P1
The unthreaded MP508P1 OAP Mirror Adapter is sized to fit inside a Ø3" mirror mount, such as the KS3 Mirror Mount shown above. Three standard 8-32 cap screws and the required 9/64" hex key are provided with each adapter.
MP508P2(/M)
The MP508P2(/M) OAP Mirror Adapter contains four 8-32 (M4) taps, for post mounting, that orient the OAP mirror at right angles. The distance from the center of the optic to the edge of the mount in the MP508P2 is 1.5" (38.1 mm), allowing for standardized optical axis heights when used with a fixed height post, such as our Ø1" Posts. Please note that the MP508P2(/M) is not compatible with Ø3" mirror mounts, and is instead designed for post mounting. Three standard 8-32 cap screws and the required 9/64" hex key are provided with each adapter.
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Rear View of the SM2MP3 Adapter with an SM1A7 Alignment Target Mounted in the SM1-Threaded Bore
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Ø3" OAP Mirror Threaded into a K6X2 6-Axis Locking Kinematic Mount Using an SM2MP3 Adapter
- Contains Three 8-32 Captive Screws and an Alignment Dowel for Mounting to Ø3" OAP Mirrors
- External SM2 Threading for Mounting in Ø2" Mirror Mounts
- Post Mountable in Four Orientations
- Center Hole for Through Beams Parallel to Collimated Beams
- Internal SM1-Threaded Bore for Mounting Alignments Targets
The SM2MP3 Mounting Adapter for Ø3" Off-Axis Parabolic Mirrors offers a mounting alternative to our smooth bore kinematic mirror mounts. External SM2 threading (2.035"-40) provides a mechanically stable option for mounting Ø3" OAP mirrors into an internally SM2-threaded component. Two holes spaced 1.5" apart on the back can be used to secure the adapter with an SPW801 adjustable spanner wrench. The SM2MP3 adapter also contains four 8-32 taps, for post mounting, that orient the OAP mirror at right angles. Thorlabs offers a selection of screw thread adapters, including the AP8E4M 8-32 to M4 thread adapter, which can be used to mount the SM2MP3 adapter onto M4-threaded posts.
This adapter contains three 8-32 captive screws that are positioned to align with the 8-32 tapped holes on our Ø3" OAP mirrors. Captive screws can be secured with a 5/64" (2 mm) hex key (not included). The SM2MP3 adapter also features a radial alignment slot for use with the included dowel pin to assist when mounting to a mirror. A Ø0.16" (Ø4 mm) through hole at the center of the SM2MP3 adapter provides passage for a through beam parallel to the collimated beam. The back side features an internal SM1-threaded (1.035"-40) bore for mounting externally SM1-threaded alignment tools, such as the SM1A7 alignment disk pictured above to the far right.
90° Unprotected Gold OAPs
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