Light source apparatus and measurement method
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United States of America Patent
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-
Jun 11, 2002
Grant Date -
N/A
app pub date -
Jul 7, 1998
filing date -
Oct 31, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An acousto-optic tunable filter 4 including: an acousto-optic crystal 41; an acoustic wave driver 42; and a piezoelectric transducer 43, is provided in front of a light source section 2 including a plurality of light sources 2A, 2B, . . . 2N having different wavelength characteristics. The frequency of RF generated by the acoustic wave driver 42 is varied in accordance with a desired wavelength. Thus, the light having the desired wavelength is incident on a converging lens 5 as plus and minus first-order light beams, and the light having wavelengths other than the desired wavelength is incident on a converging lens 5 as a zero-order light beam. The converging lens 5 converges the plus and minus first-order light beams and the zero-order light beams at positions different from each other. A selector 6 having openings located at the positions onto which the plus and first-order light beams are converged is provided in front of the converging lens 5. Therefore, only the light having the desired wavelength can pass through the selector 6 and is emitted from the light source apparatus 1.
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