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Harmonic Beamsplitters with Low Dispersion for Ti:Sapphire Wavelengths


  • Separate Ti:Sapphire Second Harmonic from Fundamental
  • Transmit 700 - 900 nm P-Polarized Light
  • Reflect 360 - 440 nm S-Polarized Light
  • High Suppression Ratio of Reflected Fundamental
  • Designed for 56° AOI

Our harmonic beamsplitters separate
the fundamental and second harmonic of
Ti:Sapphire lasers (not to scale).

UBS20

Ø1" Round Substrate

UBS21

Elliptical Substrate with
25 mm Minor Diameter

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Specifications
Item # UBS20 UBS21
Optic Shape Round Elliptical
Diameter 1" (25.4 mm) Minor: 25.0 mm (0.98")
Major: 44.2 mm (1.74")
Diameter Tolerance +0.00/-0.20 mm Minor: +0.00/-0.10 mm
Major: N/A
Thickness 4.0 mm 2.0 mm
Thickness Tolerance ±0.4 mm ±0.10 mm
Reflectance 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
Parallelism N/A ≤5 arcsec
Substrate UV Fused Silicab
Reflectance/Transmission
(Raw Data)
Reflectance
Transmission
  • Specified Over Clear Aperture; Measured at 632 nm
  • Click Link for Detailed Specifications on the Substrate

Features

  • Beamsplitter for Second Harmonic of Ultrafast Ti:Sapphire Lasers
  • Rs > 98.5% (360 - 440 nm); Rp < 0.3% (700 - 900 nm)
  • Low Group Delay Dispersion (GDD): < 20 fs2 from 360 nm to 440 nm
  • UV Fused Silica Substrate with Beamsplitter Coating on Front Surface
  • Round Format or Elliptical Format for Circular Aperture at 56° AOI

Thorlabs' Ultrafast Harmonic Beamsplitters, also known as harmonic separators, are designed to separate the fundamental and second harmonic of light from an ultrafast Ti:Sapphire laser. Each optic features a coating designed for high reflectance of s-polarized light in the 360 to 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. These beamsplitters are 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 one surface of the UV fused silica substrate, while the other surface is uncoated. The edge of the round substrate (Item # UBS20) is engraved with the item # and an arrow indicating the coated side of the beamsplitter. The coated side of the elliptical variant (Item # UBS21) may be determined through visual inspection.

These beamsplitters are offered in round or elliptical variants. The elliptical substrate offers a larger clear aperture than the round substrate when mounted at 56° AOI. We recommend mounting Ø1" round beamsplitters in our POLARIS-B1G or POLARIS-B1S Polaris Mounts. For mounting 25 mm elliptical beamsplitters, we offer the BW25M Brewster's Angle Mount. Please refer to the photos below.

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

Fixed Polaris Beamsplitter Mount
Click to Enlarge
View Imperial Product List
Item #QtyDescription
POLARIS-B1S1Polaris Ø1" Flexure-Clamp Fixed Mount, Optimized for Beamsplitters
UBS201Ø1" Round Low-GDD Beamsplitter for Second Harmonic of Ultrafast Ti:Sapphire Lasers
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
UBS201Ø1" Round Low-GDD Beamsplitter for Second Harmonic of Ultrafast Ti:Sapphire Lasers
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 Clamping Screw
UBS20 Round Beamsplitter in a
POLARIS-B1S Flexure-Clamp Mount
Ultrafast Dichroic Brewster's Window
Click to Enlarge

UBS21 Elliptical Beamsplitter in a
BW25M Brewster's Angle Mount

Click here for raw data.
This data was taken at a 56° angle of incidence. Values are typical and will vary from lot to lot.
The blue shaded regions denote the wavelength ranges over which the reflectance is specified.


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Thorlabs offers a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see below for more information.

Harmonic Beamsplitters with Low Dispersion for Ti:Sapphire Wavelengths

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" Round Low-GDD Beamsplitter for Second Harmonic of Ultrafast Ti:Sapphire Lasers
$242.05
Today
UBS21 Support Documentation
UBS2125 mm Minor Diameter Elliptical Low-GDD Beamsplitter for Second Harmonic of Ultrafast Ti:Sapphire Lasers
$310.00
Today
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