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High Speed Optical Chopper vs. PEM
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 | PEM | |
| 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 | * |
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