Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1995-12-18
1997-08-12
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
372 32, H01S 3098, G01N 2165
Patent
active
056571208
ABSTRACT:
A diffraction grating receives a laser beam from a semiconductor laser diode. Light is diffracted in a first order of diffraction of the grating, through an aperture which selects a desired wavelength, free from side modes of the laser diode. A minor proportion of the light is reflected back by a glass window, and is fed back into the laser diode to stabilise it, preventing mode hopping. The majority of the light of the desired wavelength passes through the window to an output. Because the output light is both free from side modes and not subject to mode hopping, it is suitable for use as the exciting light in spectroscopy, including Raman spectroscopy.
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H. Patrick et al., "Frequency stabilization of a diode laser using simultaneous optical feedback from a diffraction grating and a narrowband Fabry-Perot cavity," Rev. Sci. Instrum. 62 (11), Nov. 1991 pp. 2593-2595.
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Derwent Abstracts: AN 94-135835/16, AN 94-264234/32, AN 94-255567/31, AN 93-067365/08, AN 93-067363/08, AN 92-141387/17, AN 91-109641/15, AN 91-073191/10 and AN 89-060978/08.
McGraw Vincent P.
Renishaw plc
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