22 February 2013 Compact laser beam analyzer with polarization independent optics and wide dynamic range of neutral density adjustment
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Abstract
An all passive optical design laser beam waist analyzer has been developed which can analyze in real time a focused beam waist independent upon its polarization state and facilitates a wide dynamic range of neutral density adjustment for optimizing the intensity on the sensor in an extremely compact size. The technique is applicable from the UV to the far infrared and tests in the visible and the far infrared are presented.
At the core of the design is a short Fabry-Perot resonator which produces spatial time slices of a focused laser beam and post the resonator is a pair of wire grid polarizers. The Fabry-Perot resonator optics provides a ~ 4.0 optical density for the incoming laser beam. As the intensity of the light following the Fabry-Perot resonator is sufficiently low, a very efficient and compact arrangement of a pair of wire gird polarizers are introduced to provide a wider dynamic range of focus intensity at the sensor plane without the need to add additional neutral density filters. This simple, but unique combination of optics, makes for a very compact and efficient means to evaluate focused laser beams from the ultra violet to the far infrared.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Scaggs, Michael Scaggs, Gil Haas, Gil Haas, } "Compact laser beam analyzer with polarization independent optics and wide dynamic range of neutral density adjustment", Proc. SPIE 8600, Laser Resonators, Microresonators, and Beam Control XV, 86000R (22 February 2013); doi: 10.1117/12.2004311; https://doi.org/10.1117/12.2004311
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