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3 January 1986 Output Power Stabilization of Collimated, Solid-State Laser Emissions As Applied to High Accuracy Attenuance Measurements
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Abstract
Measurement of optical attenuance over long path-lengths and at relatively specific wavelengths, is facilitated by recent developments in laser-diode technology, compared to previous instrumentation methods. Substantial optical power may be coupled into low divergence optical beams and at higher power efficiency compared to other sources. Unfortunately, well-known characteristics of solid-state laser diodes predicate use of complicated bias and modulation stabilization methods to avoid both facet damage and operation below threshold over temperature extremes. Although temperature control of the laser emitter is possible to eliminate these problems and provide mode stabilization, system power efficiency is compromised. The accuracy of the aforementioned feedback methods is discussed relative to temperature effects within the optical and electronic portions of the system. Angular emission changes and wavelength/temperature coefficients of detectors used for feedback limit the accuracy attainable. Examples are given for a specific laser diode operating near 800 nm. Additional correction methods are discussed which result in improved stability without adversely affecting system power efficiency. Experimental verification and overall system accuracy are reported.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Frank M. Caimi "Output Power Stabilization of Collimated, Solid-State Laser Emissions As Applied to High Accuracy Attenuance Measurements", Proc. SPIE 0566, Fiber Optic and Laser Sensors III, (3 January 1986); https://doi.org/10.1117/12.949813
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