Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1997-11-19
1999-08-31
Font, Frank G.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356346, 356352, 356358, G01J 328
Patent
active
059460903
ABSTRACT:
A spectrometric method is disclosed which uses a novel tunable laser as a monochromatic light source to carrying out spectrometry efficiently. As the tunable laser, a tunable laser is used which comprises a laser resonator so provided therein with a laser medium 14 capable of laser oscillation in a predetermined range of wavelength and a birefringent acousto-optic element 100 and which is capable of wavelength selection by selecting a frequency of an acoustic wave to be generated in the birefringent acousto-optic element 100 by means of a piezoelectric element 22 connected to a RF power source 20. The tunable laser is used instead of a spectroscopic light source and a monochromator in a conventional spectrophotometer to thereby carry out spectrometry efficiently. In case of detecting Raman scattered light no influence of fluorescence without using a spectroscope, a tunable laser 140 is controlled by a controlling device 141 to sweep a wavelength of a monochromatic light beam LB with which a sample S is irradiated while alternately switching the wavelength between a first frequency .upsilon..sub.ex1 and a second frequency .upsilon..sub.ex2 having a frequency difference .DELTA..upsilon..sub.ex relative to the first frequency .upsilon..sub.ex1. The resulting scattered light emanated from the sample S is detected by a photodetector 145 through an interference filter 144 which transmits light having an obsrvation frequency .upsilon..sub.ob. Output of the photodetector 145 is subjected to phase synchronous detection by a lock-in amplifier 146 and processed by a signal processor 147 to obtain a Raman spectrum ot the sample S.
REFERENCES:
patent: 4444501 (1984-04-01), Schwiesow
Akagawa Kazuyuki
Tashiro Hideo
Wada Satoshi
Font Frank G.
Ratiff Reginald A.
The Institute of Physical and Chemical Research
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