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Products Home / Optical Elements / Optical Mirrors / Off-Axis Parabolic Mirrors / Off-Axis Parabolic Mirrors with Through Holes, Protected SilverOff-Axis Parabolic Mirrors with Through Holes, Protected Silver
- Centered Hole for Superposition of Two Beams
- Protected Silver Coating
- Available with Reflected Focal Lengths of 4", 6", or 9"
- SM-Threaded, Unthreaded, and Post-Mountable Adapters Provide
Flexible Mounting Options
MPD249H-P01
Ø2", RFL = 4"
MPD399H-P01
Ø3", RFL = 9"
SM2MP
SM2-Threaded
Mounting Adapter
Through Beam is Parallel to Focused Beam
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.
Features
- Ravg > 97% from 450 nm - 2 µm; Ravg > 96% from 2 - 20 µm
- Centered Hole for Through Beam Parallel to Focused Beam
- Ø8 mm Entrance Hole Tapers Down to Ø3 mm Hole in Mirror Surface
- Reflected Beam is Focused without Spherical or Chromatic Aberrations
- Reflected Focal Lengths: 4", 6", or 9" (50.8 mm, 101.6 mm, 152.4 mm, or 228.6 mm)
- Surface Roughness: <100 Å (RMS)
- Three Kinds of Mounting Adapters for 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
- Custom Off-Axis Parabolas with Holes Available (Contact Tech Support)
Thorlabs' Off-Axis Parabolic (OAP) Mirrors with Through Holes are designed for applications that require two beams to propagate collinearly through space. Their substrates contain a centered bore that joins a beam traveling through the bore with a beam being reflected and focused by the parabolic surface, as illustrated in the diagram below. The Ø8 mm hole in the back of the substrate tapers down to a Ø3 mm hole as it approaches the mirror surface, permitting the through beam to be focused by a lens as it propagates. For more details, please see the Application Notes section below.
As with the rest of our off-axis parabolas, these mirrors are segments of a parent parabolic mirror. They achromatically focus a collimated beam, and their all-reflective design eliminates phase delays and absorption losses introduced by transmissive optics and makes them well suited for use with femtosecond pulsed lasers.
The angle between the focused beam and the collimated beam (off-axis angle) is 90°. As shown in the diagram to the left, the propagation axis of the collimated beam to be reflected should be normal to the base of the substrate to achieve a proper focus. The diamond-turned parabolic surface has protected silver coating which provides an average reflectance of >96% from 450 nm - 20 µm (see the Graphs tab for plots of the coatings' performance).
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Back View with Tapered Hole
The OAP mirrors are fabricated using aluminum substrates. The non-optical surfaces are black-anodized and laser-engraved with the item number for easy identification. The interior of the conical bore is not anodized.
Care and Handling
Silver coated mirrors require additional care due to their susceptibility to damage from environmental conditions and improper handling. Fingerprints, contact with abrasive surfaces, and environments with high humidity or temperature will diminish the effectiveness of the protective overcoat leaving the silver coating susceptible to oxidation and degradation. When working with silver mirrors, follow standard practices for handling optics. Latex gloves or similar protective coverings are recommended to prevent oil and other residues on the user’s fingers from reaching the optical surface. Even with such precautions, care should be taken not to touch the mirrored face or edges. Silver mirrors should be used and stored in areas at room temperature with minimal humidity. For information on how to clean mirrors and other optics, visit our Optic Cleaning Tutorial.
Application Notes
These optics are often used in electro-optic sampling measurements and other pump-probe experiments, such as time-resolved terahertz spectroscopy (TRTS). In these experiments, it is necessary to illuminate the electro-optic crystal with a pump beam passing through the mirror so that it overlaps with the focus of the THz probe beam that is reflected off of the surface of the parabola, as shown in the diagram to the right.
| 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 | |
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| Protected Silver | 450 nm - 20 µm | |
|
|
Customb |
| Protected Gold | 800 nm - 20 µm | |
|
|
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| 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 | Protected Silver | |
| Reflectance (Average) | >97% from 450 nm to 2 µm >96% from 2 µm to 20 µm |
|
| Off-Axis Angle | 90° | |
| Clear Aperture | >90% of Diametera, Not Including Hole | |
| Hole Orientation | Horizontal | |
| Hole Diameter | 3 mm on Coated Surface 8 mm on Back of Substrate |
|
| Surface Roughness (RMS) | <100 Å | |
| Surface Quality | 40-20 Scratch-Dig | |
| Parent Focal Length Tolerance | ±1% | |
| Reflected Focal Length Tolerance | ±1% | |
| Bottom Mounting Holes | 8-32 Taps in Radial Pattern (3 Places) | |
| Substrate | Aluminum | |
| Manufacturing Process | Diamond Turned | |
| Item # | Diametera | Thicknessa | Reflected Focal Lengtha | Parent Focal Lengtha | Reflected Wavefront Error (RMS) |
|---|---|---|---|---|---|
| MPD249H-P01 | 2" (50.8 mm) | 2.47" (62.8 mm) | 4" (101.6 mm) | 2" (50.8 mm) | <λ/4 at 633 nm |
| MPD269H-P01 | 2" (50.8 mm) | 2.47" (62.8 mm) | 6" (152.4 mm) | 3" (76.2 mm) | |
| MPD369H-P01 | 3" (76.2 mm) | 3.47" (88.2 mm) | 6" (152.4 mm) | 3" (76.2 mm) | <λ/2 at 633 nm |
| MPD399H-P01 | 3" (76.2 mm) | 3.47" (88.2 mm) | 9" (228.6 mm) | 4.50" (114.3 mm) |
The shaded region in the graph denotes the range 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.
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Mounting Adapter Installation
Mounting Adapters
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.
For our Ø2" OAP mirrors*, we offer three types of mounting plates. The first type is designed to be mounted in any Ø3" mirror mount. 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 SM2-threaded for direct compatibility with any internally SM2-threaded components, such as our rotation mounts.
Our Ø2" OAP mirrors can also be adapted to our SM threads by placing them into our SM Thread to Double Bore Adapters. This 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 (M4) tapped holes for post mounting and has external SM2 threading for mounting on our SM2-threaded component, such as our 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.
*Please note that these mounting adapters for Ø2" OAP mirrors do not have a centered hole for a through beam parallel to the collimated beam. Our Smooth bore mounting adapters can be used to mount these parts.
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 very easily using the divergence half-angle of the incident light (Θ) and the reflected focal length of the OAP mirror. 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 | |
| 2" (50.8 mm) | 4.4 mm | 8.9 mm | 13.3 mm | 17.6 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 |
| 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.
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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.
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Toroidal mirrors have two different radii of curvature and are used to image off-axis points without introducing astigmatism.
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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:
- The Off-Axis Angle
- Locating the Optical and Focal Axes of an OAP
Click here for more insights into lab practices and equipment.
The Off-Axis Angle
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Figure 2: It is common to measure the width of the parabola with respect to a line that passes through the focus and is perpendicular to the axis.
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Figure 1: One section of the parent parabola provides a 90° off-axis angle.
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Figure 4: Decreasing the width of the parabola increases the off-axis angle. For example, compare this illustration with Figure 2.
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Figure 3: Choosing a section closer to the axis of the parabola results in a smaller off-axis angle.
The off-axis angle ( θ ) of an OAP mirror is measured between the mirror's optical and focal axes. The OAP mirror in Figure 1 has a 90° angle.
The angle depends on the segment of the parent parabola used for the OAP mirror, as well as the width (Figure 2) of the parent parabola.
Proximity of Parabolic Segment and Focal Point
Choosing a segment of the parent parabola closer to the focal point reduces the off-axis angle. The mirror in Figure 3 has a smaller angle than the one in Figure 2, but the only difference between them is that the section of the parabola selected for the OAP mirror in Figure 3 is closer to the focal point.
The location of the parabolic segment also controls the focal length. Choosing a parabolic segment closer to the focal point results in a shorter distance between the center of the mirror and the focal point.
Width of the Parent Parabola
Increasing the width of the parent parabola decreases the off-axis angle. This inverse relationship is illustrated by Figures 3 and 4. The width of the parabola is larger in Figure 3, and this is also the mirror with a smaller angle.
The width of the parent parabola also affects the focal length. The wider the parabola, the longer the focal length.
Available Off-Axis Angles
OAP mirrors are often designed to have a 90° off-axis angle, but OAP mirrors with angles less than 90° are also common.
Date of Last Edit: Dec. 4, 2019
Locating the Optical and Focal Axes of an OAP
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Figure 6: The orientation of the optical axis can be found by noting it is perpendicular to the base of the mirror's substrate. The location of the focal point can be estimated by considering collimated light rays that are directed parallel to the optical axis. These rays reflect symmetrically around the local surface normals and pass through the mirror's focal point.
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Figure 5: OAP mirrors have a flat, round base and a side that varies in height around the circumference. The planar base is normal to the mirror's optical axis. Shown above is the MPD2151-P01.
When working with off-axis parabolic (OAP) mirrors, it can be challenging to identify the optical and focal axes. This is particularly true when the parabolic curvature of the surface is hard to see (Figure 5).
The physical characteristics and dimensions of the mirror's substrate can provide a useful guide when positioning and aligning the mirror.
The mirror's substrate has a flat, round base. The optical axis is oriented normal to this planar base. Therefore, collimated light should be directed normal to the surface of the base.
The substrate has a tall side and a short side, and the reflective surface is sloped between them. The surface normal at different points across the reflector can be roughly estimated by visually examining the surface (Figure 6).
The location of the focal point can be estimated by considering a ray of collimated light, parallel to the optical axis, that reflects from the surface of the mirror. The incident ray reflects symmetrically about the surface normal. The reflected ray will pass through the focal point. By mentally tracing two rays from positions close to the tall and short sides of the mirror, respectively, it should be possible to estimate the location of the focal point.
Mounting and Alignment Features on Thorlabs' OAP Mirrors
Thorlabs' OAP mirrors have an alignment hole and three tapped mounting holes machined into the bottom surface of their bases. The pattern of tapped holes matches the vertices of an equilateral triangle, and the position of the smooth-bore alignment hole indicates the short side of the OAP mirror. The tapped holes are designed to secure the mirror to mounting adapters or mounting platforms.
Date of Last Edit: Dec. 4, 2019
| Posted Comments: | |
JDavis
(posted 2014-06-23 13:19:50.73) any chance of getting this product with other coating options? jlow
(posted 2014-08-05 01:45:04.0) Response from Jeremy at Thorlabs: We can do other coatings. I will contact you directly about this. You can also e-mail us at techsupport@thorlabs.com for a quote. user
(posted 2014-05-13 11:52:51.217) You drilled the hole in the wrong direction. besembeson
(posted 2014-05-15 02:58:27.0) Response from Bweh E at Thorlabs: Thanks for your feedback. We have a very extensive optics facility that we accommodate various custom solutions for our customers (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6843#ad-image-0). If you have a particular customization for an optic different from what we show on the web, please feel free to contact us and we gladly discuss this with you. tekavec
(posted 2013-11-25 16:02:43.2) I see that you have parabolic mirrors with a hole through the center. Do you offer (or is it possible to get a custom part) flat mirrors with a hole through the center angled at 45 degrees to the surface? tcohen
(posted 2013-11-26 09:14:47.0) Response from Tim at Thorlabs: Thanks for contacting us. We can offer this as a special while we look into the potential for adding it as a new line to our catalog. I've contacted you via email to discuss your requirements. christian.b.schmidt
(posted 2013-06-04 03:28:18.473) I am positively surprised to see a hole in the AOPM. By now we always did this by ourselves. But I am looking for an OAPM like: MPD508254H3-90-M01. (Diameter: 2", 90°, RFL=2" (PFL=1"), gold-coating, with hole) Please let me know, if you can offer this product in the future. tcohen
(posted 2013-06-06 16:01:00.0) Response from Tim at Thorlabs: Thank you for your request. The introduction of this line was inspired by customer requests for them and although we do not currently have plans for this specific product we will discuss it as we are extending our selection of these catalog products. |
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| Item # | MPD249H-P01 | MPD269H-P01 |
|---|---|---|
| Diametera | 2" (50.8 mm) | 2" (50.8 mm) |
| Reflected Focal Length (RFL)a | 4" (101.6 mm) | 6" (152.4 mm) |
| Parent Focal Lengtha | 2" (50.8 mm) | 3" (76.2 mm) |
| Hole Orientation | Parallel to Focused Beam | |
| Hole Diameter | 3 mm on Coated Surface 8 mm on Back of Substrate |
|
| Thicknessa | 2.47" (62.8 mm) | |
| Off-Axis Angle | 90° | |
| Reflected Wavefront Error | <λ/4 at 633 nm | |
| Base Mounting Holesb | Three 8-32 Taps | |
Care and Handling
Silver coated mirrors require additional care due to their susceptibility to damage from environmental conditions and improper handling. Fingerprints, contact with abrasive surfaces, and environments with high humidity or temperature will diminish the effectiveness of the protective overcoat leaving the silver coating susceptible to oxidation and degradation. When working with silver mirrors, follow standard practices for handling optics. Latex gloves or similar protective coverings are recommended to prevent oil and other residues on the user’s fingers from reaching the optical surface. Even with such precautions, care should be taken not to touch the mirrored face or edges. Silver mirrors should be used and stored in areas at room temperature with minimal humidity. For information on how to clean mirrors and other optics, visit our Optic Cleaning Tutorial.
Zoom
| Item # | MPD369H-P01 | MPD399H-P01 |
|---|---|---|
| Diametera | 3" (76.2 mm) | 3" (76.2 mm) |
| Reflected Focal Length (RFL)a | 6" (152.4 mm) | 9" (228.6 mm) |
| Parent Focal Lengtha | 3" (76.2 mm) | 4.5" (114.3 mm) |
| Hole Orientation | Parallel to Focused Beam | |
| Hole Diameter | 3 mm on Coated Surface 8 mm on Back of Substrate |
|
| Thicknessa | 3.47" (88.2 mm) | |
| Off-Axis Angle | 90° | |
| Reflected Wavefront Error | <λ/2 at 633 nm | |
| Base Mounting Holes | Three 8-32 Taps | |
Care and Handling
Silver coated mirrors require additional care due to their susceptibility to damage from environmental conditions and improper handling. Fingerprints, contact with abrasive surfaces, and environments with high humidity or temperature will diminish the effectiveness of the protective overcoat leaving the silver coating susceptible to oxidation and degradation. When working with silver mirrors, follow standard practices for handling optics. Latex gloves or similar protective coverings are recommended to prevent oil and other residues on the user’s fingers from reaching the optical surface. Even with such precautions, care should be taken not to touch the mirrored face or edges. Silver mirrors should be used and stored in areas at room temperature with minimal humidity. For information on how to clean mirrors and other optics, visit our Optic Cleaning Tutorial.
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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.
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