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Right Angle Prism Mirrors, Dielectric Coatings


  • Broadband Dielectric Coatings Available
    for 400 - 750 nm or 750 - 1100 nm
  • Seven Leg Dimensions From 3.0 mm to 25.0 mm

MRA20-E03

(L = 20.0 mm)

MRA10-E03

(L = 10.0 mm)

MRA25-E02

(L = 25.0 mm)

MRA03-E02

(L = 3.0 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.
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

  • Two Broadband Dielectric Coatings with Ravg > 99% for 400 - 750 nm or 750 - 1100 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
  • Designed for Angles of Incidence (AOI) from 0° to 45°
  • Fabricated from N-BK7 Glass Substrate
  • Designed for Reflections on the Front Surface of the Hypotenuse

Thorlabs offers right-angle prism mirrors with a broadband dielectric coating for the 400 - 750 nm or 750 - 1100 nm wavelength range. They provide an average reflectance of >99% over these ranges (please see the Graphs tab for more info). 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 dielectric coated surface (see the Specs tab for details). Right angle prism mirrors featuring metallic 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 triangular 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 25.0 mm prisms 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
Item # La Xa Prism
Angular
Tolerance
Reflectance
(Click for Graph)
Broadband Dielectric Coating: 400 nm - 750 nm
MRA03-E02 3.0 mm 4.2 mm ±10 arcmin Ravg > 99%
(400 nm - 750 nm)
MRA05-E02 5.0 mm 7.1 mm ±3 arcmin
MRA10-E02 10.0 mm 14.1 mm
MRA12-E02 12.5 mm 17.7 mm
MRA15-E02 15.0 mm 21.2 mm
MRA20-E02 20.0 mm 28.3 mm
MRA25-E02 25.0 mm 35.4 mm
Broadband Dielectric Coating: 750 nm - 1100 nm
MRA03-E03 3.0 mm 4.2 mm ±10 arcmin Ravg > 99%
(750 nm - 1100 nm)
MRA05-E03 5.0 mm 7.1 mm ±3 arcmin
MRA10-E03 10.0 mm 14.1 mm
MRA12-E03 12.5 mm 17.7 mm
MRA15-E03 15.0 mm 21.2 mm
MRA20-E03 20.0 mm 28.3 mm
MRA25-E03 25.0 mm 35.4 mm
  • As Specified in the Leftmost Drawing
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) 10-5 Scratch-Dig
Clear Aperture 70% of Face Length and Width
  • Click Link for Detailed Specifications on the Substrate
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.

These plots show the reflectance of our -E02 (400 - 750 nm) and -E03 (750 - 1100 nm) dielectric coatings for a typical coating run. 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. For applications that require a mirror that bridges the spectral range between the dielectric coatings, please consider a metallic mirror.

-E02 Coating (400 - 750 nm)

Excel Spreadsheet with Raw Data for -E02 Coating, 8° and 45° AOI

-E03 Coating (750 - 1100 nm)

Excel Spreadsheet with Raw Data for -E03 Coating, 8° and 45° AOI


Posted Comments:
user  (posted 2018-06-28 12:47:17.523)
Why is the specified clear aperture so low ("70% of face length and width"), while the dielectric coating seems to extend until the beveled edge of the prism? For example, the 5mm prism has a specified clear aperture of only 3.5mm (height), but the bevels in the technical drawing seem to be only 0.25mm on each side so it would seem that the coated part of the mirror face is at least 4.5mm. What makes that we cannot use the outer parts of the coated area?
YLohia  (posted 2018-07-03 10:28:44.0)
The mirrors are laid out flat on two rails in the coating chamber with the surface being coated facing downwards and making contact with the rails. These rails are ~0.5mm thick each and cannot be placed on the beveled edges of the mirror surface. So now, the remaining clear aperture is 5 mm - 2*0.25 mm - 2*0.50 mm = 3.5 mm at best, which is the 70% spec. Please contact techsupport@thorlabs.com if you have further questions.
mlippert  (posted 2016-12-07 13:31:07.067)
Hello, I'm using micro-prisms for my research (Ca-Imaging in the brain). Typically these prisms are very tiny (0.2-1 mm length). Would it be possible to take up such small prisms (dielectric or metallic) into your catalog? And I would have another suggestion for an additional product: GRIN Lenses. Currently, the ones you carry are mainly useful for fiber coupling. However, recently people have been starting to do a lot of micro-endoscopy in the brain using GRIN lenses as relay to bring an image plane from deep within the brain to the surface (e.g. Mark Schnitzer and his Inscopix company). While the original lenses are from GRINTECH, GoFoton also now manufactures GRIN lenses for imaging applications. Usually the required lenses would be able to bring a imaging plane of 200 µm in front of one side up to the second side of a lens, which is typically 3,5 or 7 mm long. The wavelengths used are in the blue for excitation and green for emission. If you were to approach GoFoton, they will know which lenses I'm talking about. Maybe they'd be happy to find a distributor. Best, Michael
tfrisch  (posted 2016-12-14 02:15:15.0)
Hello Michael, thank you for your detailed feedback. I will reach out to you directly about our custom capabilities for prisms. As for the GRIN lenses, I have posted your idea in our internal engineering forum. Thank you for the suggestion.
am  (posted 2016-10-11 13:49:20.247)
Can you de prism 3mm? Right Angle Prism Mirrors, Dielectric Coatings
jlow  (posted 2016-10-11 09:54:47.0)
Response from Jeremy at Thorlabs: Yes we can make 3mm prism mirrors. We will release these as stock items online by the end of this month.

Right-Angle Prism Mirrors, Broadband Dielectric Coating (400 nm - 750 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: >99% (400 - 750 nm)

These broadband dielectric-coated right angle prisms are ideal for near-normal and 45° reflections. They perform well with both S- and P-polarized light over their specified wavelength range of 400 - 750 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-E02 Support Documentation
MRA03-E02Right-Angle Prism Dielectric Mirror, 400 - 750 nm, L = 3.0 mm
$59.10
Today
MRA05-E02 Support Documentation
MRA05-E02Right-Angle Prism Dielectric Mirror, 400 - 750 nm, L = 5.0 mm
$85.37
Today
MRA10-E02 Support Documentation
MRA10-E02Right-Angle Prism Dielectric Mirror, 400 - 750 nm, L = 10.0 mm
$104.04
Today
MRA12-E02 Support Documentation
MRA12-E02Customer Inspired! Right-Angle Prism Dielectric Mirror, 400 - 750 nm, L = 12.5 mm
$113.46
Today
MRA15-E02 Support Documentation
MRA15-E02Customer Inspired! Right-Angle Prism Dielectric Mirror, 400 - 750 nm, L = 15.0 mm
$116.62
Today
MRA20-E02 Support Documentation
MRA20-E02Right-Angle Prism Dielectric Mirror, 400 - 750 nm, L = 20.0 mm
$128.17
Today
MRA25-E02 Support Documentation
MRA25-E02Right-Angle Prism Dielectric Mirror, 400 - 750 nm, L = 25.0 mm
$155.04
Today

Right-Angle Prism Mirrors, Broadband Dielectric Coating (750 nm - 1100 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: >99% (750 nm - 1100 nm)

These broadband dielectric-coated right angle prisms are ideal for near-normal and 45° reflections. They perform well with both S- and P-polarized light over their specified wavelength range of 750 - 1100 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-E03 Support Documentation
MRA03-E03Customer Inspired! Right-Angle Prism Dielectric Mirror, 750 - 1100 nm, L = 3.0 mm
$64.35
Today
MRA05-E03 Support Documentation
MRA05-E03Right-Angle Prism Dielectric Mirror, 750 - 1100 nm, L = 5.0 mm
$91.14
Today
MRA10-E03 Support Documentation
MRA10-E03Right-Angle Prism Dielectric Mirror, 750 - 1100 nm, L = 10.0 mm
$110.16
Today
MRA12-E03 Support Documentation
MRA12-E03Customer Inspired! Right-Angle Prism Dielectric Mirror, 750 - 1100 nm, L = 12.5 mm
$118.72
Today
MRA15-E03 Support Documentation
MRA15-E03Customer Inspired! Right-Angle Prism Dielectric Mirror, 750 - 1100 nm, L = 15.0 mm
$121.87
Today
MRA20-E03 Support Documentation
MRA20-E03Right-Angle Prism Dielectric Mirror, 750 - 1100 nm, L = 20.0 mm
$135.53
Today
MRA25-E03 Support Documentation
MRA25-E03Right-Angle Prism Dielectric Mirror, 750 - 1100 nm, L = 25.0 mm
$161.16
Today
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