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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 Colinear
with Point Source
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
- 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 are first-surface mirrors whose reflective surfaces are equivalent to 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).
Click to Enlarge
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 | |
|||
| 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 | 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 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 counterbores and an alignment pin. Together, these features allow our OAP mirrors to be securely mounted to our extensive selection of optomechanical components. 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.
We do not currently offer a mounting adapter for the Ø3" OAP mirror. However, it can be directly mounted in our KS3 Precision Kinematic Mirror Mount.
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.
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.
| 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.
Zoom
Click to Enlarge
Ø2" OAP Mirror with Hole Parallel to Focused Beam Mounted on a Ø1/2" Post
Using an MP508P2 Adapter
- Contains Three #8 Counterbores and an Alignment Pin for Mounting to 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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