13 August 1993 Experimental results on high-brightness semiconductor lasers
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Proceedings Volume 1868, Laser Resonators and Coherent Optics: Modeling, Technology, and Applications; (1993) https://doi.org/10.1117/12.150613
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
Abstract
Brightness is power per emitting area per solid angle. Obviously, to achieve high brightness, one needs to have a source with power and the smallest combination of effective emitting area and solid angle. Consider a square with side "d" emitting power "p". For a plane wave in the aperture diffraction theory tells us that the light emitted will diverge with an angle on the order of Aid. This yields; B = p/((d x d) x (A/d) x (A/d)) = P1 (A x A) . Consider the same aperture , but this time the wavefront is curved with a radius "r". The solid angle is now d x d/ (r x r) which can be much larger than A x t/(d x d) , but the effective area is no longer d x d. Diffraction theory says the effective size of the source to fill the aperture is r x Aid. This again yields B = p/(A x A). This leads to the criteria for a useful high brightness source; that it be spatially coherent across the emitting aperture and be correctable to an effectively planar wavefront at some reference plane.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Charles E. Moeller, Charles E. Moeller, "Experimental results on high-brightness semiconductor lasers", Proc. SPIE 1868, Laser Resonators and Coherent Optics: Modeling, Technology, and Applications, (13 August 1993); doi: 10.1117/12.150613; https://doi.org/10.1117/12.150613
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