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Right Angle Prism Mirrors, Metallic Coatings


  • UV-Enhanced Aluminum, Protected Aluminum,
    Protected Silver, and Protected Gold Coatings Available
  • Seven Leg Dimensions from 3.0 mm to 25.0 mm

MRA15-M01

(L = 15.0 mm)

MRA10-P01

(L = 10.0 mm)

MRA05-F01

(L = 5.0 mm)

MRA25-G01

(L = 25.0 mm)

Related Items


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The KM100PM(/M) can be used to mount our right angle prisms when used in combination with either a PM3(/M) or PM4(/M) clamping arm. Photographed above is an MRA03-E03 mirror.
Right-Angle Prism Figure
The size of these prisms is defined by the leg dimension, L, which is indicated in the product list below. See the Specs tab for full product dimensions.
Right-Angle Prism Dimensions
Schematic that demonstrates how to orient the right angle prism mirror with respect to the incident beam.

Features

  • Reflective Coating on the Hypotenuse for Front Surface Reflections
  • Four Metallic Coatings Available: UV-Enhanced Aluminum, Protected Aluminum, Protected Silver,
    or Protected Gold
  • Seven Sizes Available with Leg Dimensions from 3.0 mm, 5.0 mm, 10.0 mm, 12.5 mm, 15.0 mm, 20.0 mm, or 25.0 mm
  • Designed for 0° to 45° Angles of Incidence (AOI)
  • Fabricated from N-BK7 Glass Substrate

Thorlabs offers right-angle prism mirrors with the following reflective metallic coatings deposited on the prism's hypotenuse: UV enhanced aluminum, protected aluminum, protected silver, or protected gold. The mirrors are designed to reflect light that is externally incident on the hypotenuse of the prism (see figure to the right), which has an optical-quality coated surface (see the Specs tab for details). These mirrors reduce alignment time and increase the rigidity of an optical system. Right angle prism mirrors featuring broadband dielectric coatings and Nd:YAG laser line coatings are also available.

As shown in the images above, there are tooling marks at the right and left edges of the coated hypotenuse. These tooling marks are part of the manufacturing process and do not infringe upon the clear aperture of the mirror (see Specs tab for details).

Please note that reflecting light off of the coated surface from inside the prism is not recommended because of the adhesion layers used in the coating process. As a result, no specifications are given for the polished legs (short sides) of the prism. The top and bottom surfaces of the prism have a fine ground glass finish.

The top surface of each 25.0 mm prism is engraved with the item number for quick identification. These prism mirrors are also available mounted inside our 30 mm cage cubes.

Right Angle Prism Mirror Selection Guide
Metallic Coatings (250 nm - 20 µm)
Dielectric Coatings (400 nm - 1100 nm)
Laser Line (532 and 1064 nm)
Knife Edge (250 nm - 20 µm)
Optical Coating Tutorial
Optic Cleaning Tutorial
Common Specifications
Substrate Material N-BK7a
Dimensional Tolerance ±0.1 mm
Surface Flatness (Coated Surface) λ/10 @ 633 nm (Peak to Valley)
Surface Quality (Coated Surface) 40-20 Scratch-Dig
Clear Aperture 70% of Face Length and Width
  • Click Link for Detailed Specifications on the Substrate
Item # La Xa Prism Angular Tolerance Reflectance
(Click for Graph)
UV Enhanced Aluminum Coating: 250 nm - 450 nm
MRA03-F01 3.0 mm 4.2 mm ±10 arcmin Ravg > 90% (250 nm - 450 nm)
MRA05-F01 5.0 mm 7.1 mm ±3 arcmin
MRA10-F01 10.0 mm 14.1 mm
MRA12-F01 12.5 mm 17.7 mm
MRA15-F01 15.0 mm 21.2 mm
MRA20-F01 20.0 mm 28.3 mm
MRA25-F01 25.0 mm 35.4 mm
Protected Aluminum Coating: 450 nm - 20 µm
MRA03-G01 3.0 mm 4.2 mm ±10 arcmin Ravg > 90% (450 nm - 2 µm)
Ravg > 95% (2 µm - 20 µm)
MRA05-G01 5.0 mm 7.1 mm ±3 arcmin
MRA10-G01 10.0 mm 14.1 mm
MRA12-G01 12.5 mm 17.7 mm
MRA15-G01 15.0 mm 21.2 mm
MRA20-G01 20.0 mm 28.3 mm
MRA25-G01 25.0 mm 35.4 mm
Protected Silver Coating: 450 nm - 20 µm
MRA03-P01 3.0 mm 4.2 mm ±10 arcmin Ravg > 97.5% (450 nm - 2 µm)
Ravg > 96% (2 µm - 20 µm)
MRA05-P01 5.0 mm 7.1 mm ±3 arcmin
MRA10-P01 10.0 mm 14.1 mm
MRA12-P01 12.5 mm 17.7 mm
MRA15-P01 15.0 mm 21.2 mm
MRA20-P01 20.0 mm 28.3 mm
MRA25-P01 25.0 mm 35.4 mm
Protected Gold Coating: 800 nm - 20 µm
MRA03-M01 3.0 mm 4.2 mm ±10 arcmin Ravg > 96% (800 nm - 20 µm)
MRA05-M01 5.0 mm 7.1 mm ±3 arcmin
MRA10-M01 10.0 mm 14.1 mm
MRA12-M01 12.5 mm 17.7 mm
MRA15-M01 15.0 mm 21.2 mm
MRA20-M01 20.0 mm 28.3 mm
MRA25-M01 25.0 mm 35.4 mm
  • As Specified in the Leftmost Drawing
Right-Angle Prism Figure
The size of these prisms is defined by
the leg dimension, L. See the table
to the right for dimensions.
Right-Angle Prism Dimensions
Schematic that demonstrates how to
orient the right angle prism mirror with
respect to the incident beam.

The shaded region in each graph denotes the spectral range over which the coating is highly reflective. Due to variations in each run, this recommended spectral range is narrower than the actual range over which the optic will be highly reflective. If you have any concerns about the interpretation of this data, please contact Tech Support.

UV-Enhanced Aluminum Coating (250 - 450 nm)

UV-Enhanced Aluminum at Near-Normal Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for UV-Enhanced Aluminum
UV-Enhanced Aluminum at 45 Degree Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for UV-Enhanced Aluminum
UV-Enhanced Aluminum at Near-Normal Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for UV-Enhanced Aluminum
UV-Enhanced Aluminum at 45 Degree Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for UV-Enhanced Aluminum

 


Protected Aluminum Coating (450 nm - 20 µm)

Protected Aluminum at Near-Normal Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for Protected Aluminum
Protected Aluminum at 45 Degree Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for Protected Aluminum

 


Protected Silver Coating (450 nm - 20 µm)

Protected Silver at Near-Normal Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for Protected Silver
Protected Silver at 45 Degree Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for Protected Silver

 


Protected Gold Coating (800 nm - 20 µm)

Protected Gold at Near-Normal Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for Protected Gold
Protected Gold at 45 Degree Incident Angle
Click to Enlarge

Excel Spreadsheet with Raw Data for Protected Gold

Posted Comments:
lebouquj  (posted 2018-09-24 12:00:11.703)
Is the λ/10 @ 633 nm for surface flatness defined as max-to-min or rms ? And is it in surface or reflected beam (twice surface) ? Thanks, Jean-Baptiste
YLohia  (posted 2018-09-25 09:29:54.0)
Hello Jean-Baptiste, when specifying the surface flatness, we use peak-to-valley. Peak-to-valley for flatness speaks to the extremes of the measurements, and comes from using test plates for spot checking. In general, the peak-to-valley tends to be 3-5x greater than the rms, but this can depend case-to-case. For this spec, we are referring to the actual coated surface flatness, not the reflected wavefront error.
lebouquj  (posted 2018-06-07 15:41:12.367)
Hi, we would like to use the reflective surface very close to one of the 45edges. Ideally <100um. Does the coating extend that close to the edge ? The so-called "Knife-Edge prism" are not usable in our case because the coating is on the 'wrong' surfaces. Thanks, Jean-Baptiste
YLohia  (posted 2018-06-13 03:48:30.0)
Hello, Jean-Baptiste, thank you for contacting Thorlabs. No, this coating does not extend all the way to the edge. The clear aperture is specified to be 70% of the length and the width of the mirror. The coating towards the edges is not expected to perform well.
zuomin.zhao  (posted 2017-08-10 10:30:36.757)
Hi, We ordered a UV fused silica right-angle prism (15 mm)from Thorlabs. Could you please directly vacuum evaporate a aluminum film (~200 micron thickness)on the Hypotenuse of the prism without any glue? The aluminun film should be a mirror without pores. Please tell me how the cost if you can do it for us, thank you r very much.
tfrisch  (posted 2017-08-16 05:37:12.0)
Hello, thank you for contacting Thorlabs. Our metallic coatings are not glued, they are evaporated coatings. I will reach out to you directly about your application, but MRA15-G01 seems similar to what you are describing.
nicolas  (posted 2017-02-14 17:40:09.093)
What is the thickness of - the silver mirror? - the SiO2 protective layer? Thanks.
tfrisch  (posted 2017-02-16 02:54:48.0)
Hello, thank you for contacting Thorlabs. Unfortunately, the thicknesses of our coating layers are proprietary. I will reach out to you directly about your application.
th6187  (posted 2014-05-21 10:33:29.11)
Dear Thorlabs team, you sell uncoated prism down to a size of L = 3 mm (e.g. PS605), but the smallest coated ones have L = 5 mm (e.g. MRA05-P01). Is it possible to get a 3 mm right-angle prism mirror (preferably with protected silver coating)? If yes, what would the costs and lead time be? And could you tell me the approximate damage threshold of a protected silver coating for a 532 nm CW laser? Thank you! SR
besembeson  (posted 2014-05-21 05:00:28.0)
A response from Bweh Esembeson at Thorlabs USA: Thanks for contacting Thorlabs. We can provide this to you as a custom item. I will follow-up with you by email for a quotation. Regarding the damage threshold for the protected silver, this can be found at the following link under the “Specs” tab, http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=905&pn=MRA05-P01#3360.
mt_Reilly  (posted 2013-09-22 05:04:40.967)
I have a question about silver vs. Gold coatings for front surface reflectors. Silver oxidizes far more readily that the somewhat chemically inert gold. Silver is a slightly better reflector though. Do you coat the silver to protect it from oxidation? Also, how well does the gold adhere to the substrate? I understand that there are concerns on this front too. Thanks for your time. Mike
jlow  (posted 2013-09-24 12:51:00.0)
Response from Jeremy at Thorlabs: There's a SiO2 protective layer on the silver mirror. Both the gold and silver mirrors have adhesion layer to help it adhere to the substrates.
bdada  (posted 2011-11-07 17:31:00.0)
Response from Buki at Thorlabs: Thank you for your interest in our prism mirrors. We can provide custom sizes. We have contacted you for more information so we can generate a quote.
Martin. Vogel  (posted 2011-11-04 21:28:29.0)
Would it be possible to get these prisms 30 mm in height?
bdada  (posted 2011-09-29 12:52:00.0)
Response from Buki at Thorlabs: The damage threshold for the dielectric coating is 2kW/cm^2 at 532nm for CW light. The damage threshold for the UV enhanced aluminum coating is 50W/cm^2 at 1064 nm and 2000kW/cm2 for the gold coating. Although the damage threshold for the coatings is not always tested at 532nm, you can use the information above as a point of reference. Please contact TechSupport@thorlabs.com if you have further questions.
cristina.martinez-g  (posted 2011-09-27 12:46:30.0)
Hello, I would need to know the damage threshold for your right angle prism mirrors for a continuous wave at 532nnm. Thank you very much cristina
jjurado  (posted 2011-07-22 17:20:00.0)
Response from Javier at Thorlabs to max.stumpf: Thank you for submitting your request. We can certainly offer our right angle prisms coated with the E04 (1280-1600nm) broadband dielectric coating. The price will depend on the quantity required. I will contact you directly to start the quotation process.
max.stumpf  (posted 2011-07-22 06:29:35.0)
Hi, I just wonder, whether Thorlabs could also offer these prisms with an EO4 coating (HR at 1550)? Can you comment on price and lead time for such a customization?
jjurado  (posted 2011-06-27 16:10:00.0)
Response from Javier at Thorlabs to dvsunm: Thank you very much for contacting us. I will send you theoretical reflectivity plots for our protected metal coatings shortly. Regarding the thickness of the coating, the typical value for this specification is 0.1 to 0.13 um.
dvsunm  (posted 2011-06-24 18:59:04.0)
Hi, Im interested in response of these mirrors beyond 20 um. Do you by any chance have reflectivity measurement beyond 20um and can you please specify what is the thickness of a metal coating? Thank you Customer Email: dvsunm@gmail.com This customer would like to be contacted.
Tyler  (posted 2008-06-04 11:06:00.0)
A response from Tyler at Thorlabs to Julia: Thank you for pointing out the typo mistakes in the part numbers listed in the "Specs" tab. They have been corrected.
j.staehler1  (posted 2008-06-04 10:21:13.0)
Hi, I just wanted to let you know that the product numbers for the metal coated prism mirrors of the overview page and the "specs" page do not coincide. Cheers Julia

Right-Angle Prism Mirrors, UV-Enhanced Aluminum Coating (250 nm - 450 nm)

  • Seven Sizes Available with Leg Dimensions of 3.0 mm, 5.0 mm, 10.0 mm, 12.5 mm, 15.0 mm, 20.0 mm, or 25.0 mm (See Above Diagrams for Details)
  • Average Reflectance: >90% (250 - 450 nm)

These UV-enhanced-aluminum-coated right angle prisms are ideal for near-normal and 45° reflections in the UV. The coating provides high reflectance with both S- and P-polarized light from 250 to 450 nm. For more information on the typical performance of these mirrors, please see the Graphs tab. For detailed specifications on each prism mirror, please see the Specs tab.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
MRA03-F01 Support Documentation
MRA03-F01Right-Angle Prism Mirror, UV Enhanced Aluminum, L = 3.0 mm
$48.33
Today
MRA05-F01 Support Documentation
MRA05-F01Right-Angle Prism Mirror, UV Enhanced Aluminum, L = 5.0 mm
$55.95
Today
MRA10-F01 Support Documentation
MRA10-F01Right-Angle Prism Mirror, UV Enhanced Aluminum, L = 10.0 mm
$67.24
Today
MRA12-F01 Support Documentation
MRA12-F01Customer Inspired! Right-Angle Prism Mirror, UV Enhanced Aluminum, L = 12.5 mm
$70.66
Today
MRA15-F01 Support Documentation
MRA15-F01Customer Inspired! Right-Angle Prism Mirror, UV Enhanced Aluminum, L = 15.0 mm
$74.07
Today
MRA20-F01 Support Documentation
MRA20-F01Right-Angle Prism Mirror, UV Enhanced Aluminum, L = 20.0 mm
$80.64
Today
MRA25-F01 Support Documentation
MRA25-F01Right-Angle Prism Mirror, UV Enhanced Aluminum, L = 25.0 mm
$89.83
Today

Right-Angle Prism Mirrors, Protected Aluminum Coating (450 nm - 20 µm)

  • Seven Sizes Available with Leg Dimensions of 3.0 mm, 5.0 mm, 10.0 mm, 12.5 mm, 15.0 mm, 20.0 mm, or 25.0 mm (See Above Diagrams for Details)
  • Average Reflectance: >90% (450 nm - 2 µm), >95% (2 - 20 µm)

These protected-aluminum-coated right angle prisms are ideal for near-normal and 45° reflections from the UV to the IR. The coating provides high reflectance with both S- and P-polarized light from 450 nm to 20 µm. The aluminum coating features a protective overcoat of SiO2 and has a smaller chance of tarnishing than protected silver in a high humidity environment. For more information on the typical performance of these mirrors, please see the Graphs tab. For detailed specifications on each prism mirror, please see the Specs tab.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
MRA03-G01 Support Documentation
MRA03-G01Right-Angle Prism Mirror, Protected Aluminum, L = 3.0 mm
$48.33
Today
MRA05-G01 Support Documentation
MRA05-G01Right-Angle Prism Mirror, Protected Aluminum, L = 5.0 mm
$55.95
Today
MRA10-G01 Support Documentation
MRA10-G01Right-Angle Prism Mirror, Protected Aluminum, L = 10.0 mm
$65.28
Today
MRA12-G01 Support Documentation
MRA12-G01Customer Inspired! Right-Angle Prism Mirror, Protected Aluminum, L = 12.5 mm
$70.66
Today
MRA15-G01 Support Documentation
MRA15-G01Customer Inspired! Right-Angle Prism Mirror, Protected Aluminum, L = 15.0 mm
$74.07
Today
MRA20-G01 Support Documentation
MRA20-G01Right-Angle Prism Mirror, Protected Aluminum, L = 20.0 mm
$77.49
Today
MRA25-G01 Support Documentation
MRA25-G01Right-Angle Prism Mirror, Protected Aluminum, L = 25.0 mm
$87.21
Today

Right-Angle Prism Mirrors, Protected Silver Coating (450 nm - 20 µm)

  • Seven Sizes Available with Leg Dimensions of 3.0 mm, 5.0 mm, 10.0 mm, 12.5 mm, 15.0 mm, 20.0 mm, or 25.0 mm (See Above Diagrams for Details)
  • Average Reflectance: >97.5% (450 nm - 2 µm), >96% (2 - 20 µm)

These protected-silver-coated right-angle prisms are ideal for near-normal and 45° reflections from the UV to the IR. The coating provides high reflectance with both S- and P-polarized light from 450 nm to 20 µm. For more information on the typical performance of these mirrors, please see the Graphs tab. For detailed specifications on each prism mirror, please see the Specs tab.

The silver coating features a protective overcoat of SiO2. Though the overcoat helps to protect silver from tarnishing, high humidity environments should be avoided. Due to their high reflectivity over the 450 nm - 20 µm range, these mirrors are well suited for use with femtosecond pulsed lasers.

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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
MRA03-P01 Support Documentation
MRA03-P01Right-Angle Prism Mirror, Protected Silver, L = 3.0 mm
$48.33
Today
MRA05-P01 Support Documentation
MRA05-P01Right-Angle Prism Mirror, Protected Silver, L = 5.0 mm
$55.95
Today
MRA10-P01 Support Documentation
MRA10-P01Right-Angle Prism Mirror, Protected Silver, L = 10.0 mm
$65.28
Today
MRA12-P01 Support Documentation
MRA12-P01Customer Inspired! Right-Angle Prism Mirror, Protected Silver, L = 12.5 mm
$70.66
Today
MRA15-P01 Support Documentation
MRA15-P01Customer Inspired! Right-Angle Prism Mirror, Protected Silver, L = 15.0 mm
$74.07
Today
MRA20-P01 Support Documentation
MRA20-P01Right-Angle Prism Mirror, Protected Silver, L = 20.0 mm
$79.59
Today
MRA25-P01 Support Documentation
MRA25-P01Right-Angle Prism Mirror, Protected Silver, L = 25.0 mm
$87.21
Today

Right-Angle Prism Mirrors, Protected Gold Coating (800 nm - 20 µm)

  • Seven Sizes Available with Leg Dimensions of 3.0 mm, 5.0 mm, 10.0 mm, 12.5 mm, 15.0 mm, 20.0 mm, or 25.0 mm (See Above Diagrams for Details)
  • Average Reflectance: >96% (800 nm - 20 µm)

These protected-gold-coated right angle prisms are ideal for near-normal and 45° reflections for use in the IR. The coating provides high reflectance with both S- and P-polarized light from 800 nm to 20 µm. The gold coating features a protective overcoat of SiO2. For more information on the typical performance of these mirrors, please see the Graphs tab. For detailed specifications on each prism mirror, please see the Specs tab.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
MRA03-M01 Support Documentation
MRA03-M01Right-Angle Prism Mirror, Protected Gold, L = 3.0 mm
$48.33
Today
MRA05-M01 Support Documentation
MRA05-M01Right-Angle Prism Mirror, Protected Gold, L = 5.0 mm
$55.95
Today
MRA10-M01 Support Documentation
MRA10-M01Right-Angle Prism Mirror, Protected Gold, L = 10.0 mm
$67.24
Today
MRA12-M01 Support Documentation
MRA12-M01Customer Inspired! Right-Angle Prism Mirror, Protected Gold, L = 12.5 mm
$70.66
Today
MRA15-M01 Support Documentation
MRA15-M01Customer Inspired! Right-Angle Prism Mirror, Protected Gold, L = 15.0 mm
$74.07
Today
MRA20-M01 Support Documentation
MRA20-M01Right-Angle Prism Mirror, Protected Gold, L = 20.0 mm
$85.10
Today
MRA25-M01 Support Documentation
MRA25-M01Right-Angle Prism Mirror, Protected Gold, L = 25.0 mm
$89.83
Today
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