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Laser Beam Propagation Analyzer

Photonics Spectra
Dec 2012
Ophir, PhotonicsRequest Info
NORTH LOGAN, Utah, Oct. 3, 2012 — Ophir Photonics Group has announced the newest version of the M2-200s camera-based beam propagation analyzer, an ISO 11146-compliant system that automatically measures laser beam quality. It adds support for 64-bit Windows 7, addressing more physical memory, minimizing the time required to swap processes, and speeding up the measurement cycle to <2 min.

Designed for 24/7 use, it features a CCD camera that works with pulsed or CW lasers from 266 to 1300 nm. The portable system measures M2, beam waist location and width, divergence, astigmatism, asymmetry ratio and the Rayleigh range for each axis. Input beam sizes can range from 0.5 to 10 mm. Manual mode is available for beams that are too large or too small, or for wavelengths outside the standard optical train.

It uses a fixed-position lens and a moving detector, enabling measurement even when the laser beam is diverging or converging. The software displays a 2- or 3-D beam profile of the currently measured point in the beam propagation curve. After each run, the beam profile of any measured point can be observed. Outlying or anomalous points can be automatically or manually excluded from the curve-fit calculations.

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beam divergence
Increase in the diameter of an initially collimated beam, as measured in milliradians (mrad) at specified points; i.e., where irradiance is a given fraction (often 1/e2) of peak irradiance.
Rayleigh range
In the region of a Gaussian beam focus by a diffraction-limited lens, it is the axial distance from the point of minimum beam waist (Wo) to the point where the beam diameter has increased to .
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