Create an Account  |   Log In

View All »Matching Part Numbers

Your Shopping Cart is Empty

Harmonic Beamsplitter with Low Dispersion for Ti:Sapphire Wavelengths

  • Separate Light from Ti:Sapphire Lasers into Harmonics
  • Reflects 360 - 440 nm S-Polarized Light
  • Transmits 700 - 900 nm P-Polarized Light
  • Designed for 56° AOI

Harmonic Beamsplitter Separates
Fundamental and Second Harmonic of
Ti:Sapphire Lasers (Not to Scale)



Related Items

Please Wait
Item # UBS20
Diameter 1" (25.4 mm)
Diameter Tolerance +0.00/-0.20 mm
Thickness 4.0 mm
Thickness Tolerance ±0.4 mm
Reflectance @ 56° AOI Rs > 98.5% (360 - 440 nm)
Rp < 0.3% (700 - 900 nm)
Group Delay Dispersion (GDD) |GDD| < 20 fs² (360 - 440 nm)
Transmission Range 700 - 900 nm
Angle of Incidence (AOI) 56°
Clear Aperture >80% of Diameter
Surface Quality 20-10 Scratch-Dig
Surface Flatnessa λ/10 Over Clear Aperture
Substrate UV Fused Silicab
(@ 56° AOI; Raw Data)
  • Measured at 632 nm
  • Click Link for Detailed Specifications on the Substrate
Fixed Polaris Beamsplitter Mount
Click to Enlarge
View Imperial Product List
Item #QtyDescription
POLARIS-B1S1Polaris Ø1" Flexure-Clamp Fixed Mount, Optimized for Beamsplitters
UBS201�1" Low-GDD Ultrafast Harmonic Beamsplitter, Rs > 98.5% (360 - 440 nm), Rp < 0.3% (700 - 900 nm)
POLARIS-CA11Flexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 1/4"-20 Clamping Screw
PLS-P11Ø1" Post for Polaris Mirror Mounts, One 8-32 Tap, L = 1.00"
View Metric Product List
Item #QtyDescription
POLARIS-B1S1Polaris­™ Ø1" Flexure-Clamped Fixed Mount, Optimized for Beamsplitters
UBS201�1" Low-GDD Ultrafast Harmonic Beamsplitter, Rs > 98.5% (360 - 440 nm), Rp < 0.3% (700 - 900 nm)
PLS-P246/M1Ø25 mm Post for Polaris Mirror Mounts, One M4 Tap, L = 24.6 mm
POLARIS-CA25/M1Flexure Clamping Arm for Ø25 mm Posts, Non-Bridging, Stainless Steel, M6 x 1.0 Clamping Screw
POLARIS-B1S Flexure-Clamp Mount with a UBS20 Beamsplitter


  • Beamsplitter for Second Harmonic of Ultrafast Ti:Sapphire Lasers
  • Rs > 98.5% (360 - 440 nm); Rp < 0.3% (700 - 900 nm)
  • >1:300 Suppression Ratio Between Fundamental and Second Harmonic
  • Low Group Delay Dispersion (GDD): < 20 fs2 from 360 nm to 440 nm
  • Ø1" UV Fused Silica Substrate Beamsplitter Coating on Front Surface

Thorlabs' UBS20 Ultrafast Harmonic Beamsplitter, also known as a harmonic separator, is designed to separate the fundamental and second harmonic of light from an ultrafast, Ti:Sapphire laser. It features a coating designed for high reflectance of s-polarized light in the 360 - 440 nm wavelength range and low reflectance of p-polarized light in the 700 to 900 nm wavelength range. The coating is designed for use at a 56° angle of incidence (AOI) to minimize the reflectance of the fundamental component. This beamsplitter is ideal for Ti:Sapphire femtosecond pulsed lasers where pulse broadening is a concern by offering less than 20 fs2 absolute GDD.

The beamsplitter coating is applied to the front surface of the UV fused silica substrate, while the back surface is uncoated. The edge of the substrate is engraved with the part number and an arrow indicating the coated side of the beamsplitter, as illustrated in the diagram above.

Thorlabs also offers a wide selection of ultrafast mirrors and beamsplitters. Additionally, we offer harmonic beamsplitters for Nd:YAG applications.

Click here for raw data.
This data was taken at a 56° angle of incidence.
The blue shaded regions denote the wavelength ranges over which the reflectance is specified.

Posted Comments:
No Comments Posted

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
UBS20 Support Documentation
UBS20Ø1" Low-GDD Ultrafast Harmonic Beamsplitter, Rs > 98.5% (360 - 440 nm), Rp < 0.3% (700 - 900 nm)
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