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I-FS040-2S2E-1-GH66 product image


For use in the 630–690 nm wavelength range, at an operating frequency of 40 MHz with an active aperture of 2 mm.

Full Product Description
630–690 nm
Active Aperture:
2.0 mm
Operating Frequency:
40 MHz
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Product description

Featuring a low power 15V DC supply requirement and high diffraction efficiency, this device is ideal for use in heterodyne interferometric systems, particularly laser Doppler velocimetry, and has been designed to facilitate double-pass configuration.

This device has an integrated RF driver and reference frequency output, optimized to achieve a high extinction ratio between modes.

Key features

  • Low insertion loss
  • Excellent power handling
  • High diffraction efficiency
  • High extinction ratio between modes
  • Low power requirement


Wavelength630–690 nm
Interaction materialTellurium dioxide
Active Aperture2.0 mm
AR coating reflectivity< 0·2% per surface
Transmission> 95%
Operating Frequency40 MHz
Frequency drift< ±10ppm
Polarization state of input beamLinear, horizontal to base
Polarization state of 1st order beamLinear, vertical to base
Polarization state of zero order beamLinear, horizontal to base
Supply voltage15V dc (±10%)
Power consumption< 1.5 W
Power supply connectionLead-through filter
RF reference output40 MHz sine-wave voltage of 0.5 - 1.0V p-p
RF reference output connectorSMB male
Harmonic distortion< 40 dB @ 40 MHz
Zero to 1st order polarization extinction ratio> 100:1
Separation angle2.4° at 655 nm
Diffraction efficiency> 90%
CoolingConduction through base

Order code


Explanation: Frequency Shifter, 40MHz, 2.0mm active aperture, shear mode, Tellurium Dioxide, 630 - 690nm, SMB male for reference output, GH66 housing.