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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)
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
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 "Experimental results on high-brightness semiconductor lasers", Proc. SPIE 1868, Laser Resonators and Coherent Optics: Modeling, Technology, and Applications, (13 August 1993);

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