Optical Chopper @holmarcproducts

Uploaded December 2024 | Updated September 2026, 13 hours ago

An optical chopper is a mechanical device which physically chops a light beam into discrete light pulses. It is widely used in various optical experiments. It modulates different light sources with given frequency for their subsequent analysis.

The chopping discs come in a variety of slot apertures and can be replaced with ease.

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$Variable Angle Laser Ellipsometer Ellipsometry is a very sensitive optical technique which provides unequaled capabilities for thin film metrology. Ellipsometry exploits phase information and polarization state of light and so can achieve angstrom level resolution. The main advantages of ellipsometry are its non-destructive character, high sensitivity and wide measurement range. The optical parameters like thickness and refractive indices of a thin film can be determined precisely by this technique. In the ellipsometer model no: HO-ED-P15, an elliptically polarized light is made incident on the test substrate and the reflected light which is linearly polarized is analyzed for polarization changes. The instrument consists of two concentrically rotating arms around a precisely graduated disc fixed to a heavy base. A laser source is held on one arm and the detector assembly on the other arm. The graduated disc has 1 scale and 0.1 resolution achieved through a vernier. Power supplies for laser source and detector are placed separately. Polarizer, analyzer and quarter waveplate are held in precision rotary stages in the optical path with precise graduations having 0-360 range and 0.1 resolution.$