Create an Account  |   Log In

View All »Matching Part Numbers


Your Shopping Cart is Empty
         

Brewster Window Optic Mounts


  • Mount Brewster Windows at Brewster's Angle
  • Design Maximizes Clear Aperture of Window
  • Compatible with Ø1/2" or Ø1" Smooth-Bore Mounts
    or Internally SM1-Threaded Components

Application Idea

BW16M with SM1P1 Adapter
for use in a KS1RS Kinematic
Rotation Mount

BW16M

Compatible with
Ø1" Mounts

BW08M2

Compatible with
Ø1/2" Mounts

BW25M

Compatible with Internally
SM1-Threaded Components

Related Items


Please Wait
BW25M with SM1P1 Adapter mounted in a KS1RS
Click to Enlarge
View Imperial Product List
Item #QtyDescription
BW25021UVFS Brewster Window, 25.0 mm Minor Diameter, 2.0 mm Thick
BW25M1Brewster Window Mount, 25 mm Minor Axis Length, 2 mm Thick Optic
KS1RS1Kinematic Rotation Mount for Ø1" Optics
TR41Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
View Metric Product List
Item #QtyDescription
BW25021UVFS Brewster Window, 25.0 mm Minor Diameter, 2.0 mm Thick
BW25M1Brewster Window Mount, 25 mm Minor Axis Length, 2 mm Thick Optic
KS1RS1Kinematic Rotation Mount for Ø1" Optics
TR100/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
BW2502 Brewster Window in Our BW25M Mount with a KS1RS Kinematic Rotation Mount (No Adapter Necessary)
BW16M with SM1P1 Adapter mounted in a KS1RS
Click to Enlarge
View Imperial Product List
Item #QtyDescription
BW16021UVFS Brewster Window, 16.0 mm Minor Diameter, 2.0 mm Thick
BW16M1Brewster Window Mount, 16 mm Minor Axis Length, 2 mm Thick Optic
SM1P11External SM1 Thread to Ø1" Optic Mount Adapter
KS1RS1Kinematic Rotation Mount for Ø1" Optics
TR41Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
View Metric Product List
Item #QtyDescription
BW16021UVFS Brewster Window, 16.0 mm Minor Diameter, 2.0 mm Thick
BW16M1Brewster Window Mount, 16 mm Minor Axis Length, 2 mm Thick Optic
SM1P11External SM1 Thread to Ø1" Optic Mount Adapter
KS1RS1Kinematic Rotation Mount for Ø1" Optics
TR100/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
BW1602 Brewster Window in Our BW16M Mount with an SM1P1 Thread Adapter and KS1RS Kinematic Rotation Mount
BW08M2 with SM05P05 Adapter mounted in a KS05RS
Click to Enlarge
View Imperial Product List
Item #QtyDescription
BW08021UVFS Brewster Window, 8.0 mm Minor Diameter, 2.0 mm Thick
BW08M21Brewster Window Mount, 8 mm Minor Axis Length, 2 mm Thick Optic
SM05P051External SM05 Thread to Ø1/2" Optic Mount Adapter
KS05RS1Kinematic Rotation Mount for Ø1/2" Optics
TR41Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
View Metric Product List
Item #QtyDescription
BW08021UVFS Brewster Window, 8.0 mm Minor Diameter, 2.0 mm Thick
BW08M21Brewster Window Mount, 8 mm Minor Axis Length, 2 mm Thick Optic
SM05P051External SM05 Thread to Ø1/2" Optic Mount Adapter
KS05RS1Kinematic Rotation Mount for Ø1/2" Optics
TR100/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
BW0802 Brewster Window in Our BW08M2 Mount with an SM05P05 Thread Adapter and KS05RS Kinematic Rotation Mount

Features

  • Holds Brewster Windows with 8 mm, 13 mm, 16 mm, 20 mm, or 25 mm Minor Diameters
  • Steel Flexure Retention Plates for Holding Optics
  • Exit Port for Reflected S-Polarized Light Allows Use in Either Direction
  • Directly Compatible with Ø1/2" or Ø1" Smooth-Bore Mounts or Internally SM1-Threaded Components

Thorlabs' Brewster Window Optic Mounts provide a stable and convenient mounting solution for our line of UV fused silica Brewster windows. These mounts are engineered with a 55° 32’ mounting angle (Brewster’s Angle at 633 nm) that allows for the transmission of p-polarized light while reflecting s-polarized light. To accommodate other wavelengths, these mounts can be attached to a kinematic mount. Our kinematic rotation mounts are particularly well suited for our Brewster windows as they provide adjustment for the reflected beam; please see the table below for compatible kinematic rotation mounts. For information concerning Brewster's angle at other wavelengths, please see the Brewster Window tab.

We offer mounting options for 8 mm (1 or 2 mm thick optic), 13 mm (2 mm thick optic), 16 mm (2 mm thick optic), 20 mm (2 mm thick optic), and 25 mm (2 mm thick optic) minor-axis-length Brewster windows (see the table below for further information). An exit port is provided for the reflected s-polarized light so that the mount may be used in either direction.

The Brewster windows are held in place using a steel flexure retention plate and three locking screws. For the BW08M1 and BW08M2, these locking screws require a 0.035" hex key. For the BW13M, BW16M, BW20M, and BW25M, these locking screws require a 0.05" hex key.

Item # Compatible Brewster Window Compatible Kinematic Rotation Mount
Minor Axis Length Thickness Item # Required Adapter Item # Item #
BW08M1 8 mm 1 mm BW0801 SM05P05 KS05RS
BW08M2 8 mm 2 mm BW0802 SM05P05 KS05RS
BW13M 13 mm 2 mm BW1302 SM1P1 KS1RS
BW16M 16 mm 2 mm BW1602 SM1P1 KS1RS
BW20M 20 mm 2 mm BW2002 SM1P1 KS1RS
BW25M 25 mm 2 mm BW2502 Not Applicablea KS1RS
  • The BW25M Optic Mount has external SM1 threading and does not require an adapter for mounting to internally SM1-threaded components.
Polarization through a Brewster Window
The image above shows the reflection of s-polarized light and transmission of p-polarized light through a Brewster window. Some s-polarized light will be transmitted through the window.

Brewster Windows

Brewster Windows are uncoated substrates that are used as polarizers, typically within a laser cavity. When positioned at Brewster's Angle (55° 32' at 633 nm), the p-polarized portion of the light will pass through the window with no losses, while a fraction of the s-polarized portion will be reflected off the Brewster window. When used in a laser cavity, the Brewster window acts essentially as a polarizer.

Brewster's angle is given by

Brewster's Angle Equation

θB is Brewster's angle.
ni is the index of refraction of the incident medium, which is 1.0003 for air.
nt is the index of refraction of the transmitting medium, which is 1.45701 for fused silica at 633 nm

It should be noted that the index of refraction is wavelength dependent. For fused silica, the index of refraction can be expressed as

Index of Refraction for Fused Silica wavelength dependency.

Please note that that the wavelength needs to be in microns when using the formula above.


Posted Comments:
user  (posted 2019-03-26 15:40:27.44)
Hello, I'm wondering if you could provide tolerances of the critical surfaces related to this mount. Thanks, Chris
YLohia  (posted 2019-03-27 09:22:01.0)
Hello Chris, thank you for contacting Thorlabs. May I ask exactly what you mean by "critical surfaces"? Could you please mark them out on this drawing? https://www.thorlabs.com/_sd.cfm?fileName=24244-E0W.pdf&partNumber=BW13M. I have reached out to you directly to gather more information.
m.hubeny  (posted 2013-10-31 12:14:19.09)
Dear Sir or Madam, we need a Mount for a 25mm Brewster Window, which is suited for UHV conditions, ideally there would be an adapter to a CF-63 flange. Is there such an adapter available? If not, another vacuum tight mount would be ok, too. Thank you, Michael Hubeny
cdaly  (posted 2013-11-07 01:37:11.0)
Response from Chris at Thorlabs: Unfortunately, at this time, we do not have an adapter which would be appropriate for mounting a Brewster window to a conflat port. We will discuss the possibility of introducing this to our product line however. Thank you very much for providing us with this suggestion.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BW08M1 Support Documentation
BW08M1Brewster Window Mount, 8 mm Minor Axis Length, 1 mm Thick Optic
$72.10
Today
BW08M2 Support Documentation
BW08M2Brewster Window Mount, 8 mm Minor Axis Length, 2 mm Thick Optic
$72.10
Today
BW13M Support Documentation
BW13MBrewster Window Mount, 13 mm Minor Axis Length, 2 mm Thick Optic
$72.20
Today
BW16M Support Documentation
BW16MBrewster Window Mount, 16 mm Minor Axis Length, 2 mm Thick Optic
$77.25
Today
BW20M Support Documentation
BW20MBrewster Window Mount, 20 mm Minor Axis Length, 2 mm Thick Optic
$77.25
Today
BW25M Support Documentation
BW25MBrewster Window Mount, 25 mm Minor Axis Length, 2 mm Thick Optic
$87.55
Today
Log In  |   My Account  |   Contact Us  |   Careers  |   Privacy Policy  |   Home  |   FAQ  |   Site Index
Regional Websites: West Coast US | Europe | Asia | China | Japan
Copyright 1999-2019 Thorlabs, Inc.
Sales: 1-973-300-3000
Technical Support: 1-973-300-3000


High Quality Thorlabs Logo 1000px:Save this Image