HW_final - ECE 455: Optical Electronics Homework Final Due:...

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Unformatted text preview: ECE 455: Optical Electronics Homework Final Due: December 1, 2011 1 Laser Design You are tasked with making at 10 W CW laser with a wavelength of somewhere in the region of 1047-1065 nm. The design will use Nd doped into one of the following media: YAG, YVO, YLF or glass. The laser wavelengths, fluorescence lifetimes, stimulated emission cross sections, indices of refraction, pump wavelengths and the absorption coefficient at the pump wavelength for the various materials are given in the table below. Material λ laser (nm) τ 2 ( μ s) σ se ( λ laser ) ( × 10- 20 cm 2 ) n e λ pump (nm) σ abs ( λ pump ) ( × 10- 20 cm Nd:YAG 1064 230 28 1.82 810 7.7 Nd:YVO 4 1064.3 100 156 1.958 809 60 Nd:YLF ( σ ) 1053 480 12 1.4481 804 4.2 Nd:YLF ( π ) 1047 480 18 1.4704 804 4.2 Nd:Glass 1064 230 28 1.53 810 0.6 In neodymium, the lower state lifetime is much shorter than the upper state lifetime, so for this assignment, assume τ 1 = 0. The laser being designed will be optically pumped by another laser, which will make one pass through the gain medium. The contraints are as follows: You can use as much crystal/glass as you would like. The maximum neodymium doping is 5 × 10 20 cm- 3 . Assume that ample pump power is available. The....
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This note was uploaded on 02/28/2012 for the course ECE 455 taught by Professor Eden,j during the Fall '08 term at University of Illinois, Urbana Champaign.

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HW_final - ECE 455: Optical Electronics Homework Final Due:...

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