Technology for Polarization Measurement

High Speed Optical Choppers

The Optical Choppers offered by Hinds Instruments are resonant devices designed to work at one frequency. We offer two ways to chop light: a High Speed Optical Chopper (HSOC) and a Photoelastic Modulator (or PEM).

High Speed Optical Chopper

The HSOC is calibrated for one wavelength, from 400 nm – 750 nm. However, it can be used within a +/- 10% range from the center wavelength without a change in calibration. The frequencies to choose from are 40, 50, and 60 kHz. The HSOC comes in a small, single enclosure package. All optics and drive electronics are included.

Photoelastic Modulator

The PEM is the most versatile choice. The wavelength range can be from 130nm – 18µm depending on the model of optical head chosen and the PEM can be used for non-chopping applications in separate set ups. Its operation as a chopper over large wavelength ranges requires additional optics (one linear and one circular polarizer) to convert the PEM into a chopper system. These can be obtained from Hinds Instruments or purchased separately by the user. The basic PEM comes in three modules: the optical head, the drive electronics and the control electronics. Frequencies range from 20-84 kHz.

All Hinds chopper options offer:

  • Wide acceptance angle
  • No moving parts
  • Minimal heat generation
  • No safety concerns
  • Small footprint and lightweight
  • Quiet operation
  • Low power consumption
  • Meets CE and RoHS compliance regulations


Selecting Your Optical Chopper

High Speed
Optical Chopper
50 kHz Operation * *
Other Frequencies *
Wavelength Adjustable *
Demodulation Electronics Available * *
Software Available for Computer Control * *
Configured for >10 mW/cm2 *
Configured for < 10 mW/cm2 * *
Smallest Footprint *
Lowest Cost *

Contact us to learn more about Hinds' Optical Choppers.