Method for selecting wavelength in wavelength-tunable lasers and laser oscillators capable of selecting wavelengths in wavelength-tunable lasers
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United States of America Patent
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Mar 31, 1998
Grant Date -
N/A
app pub date -
Nov 9, 1995
filing date -
Nov 10, 1994
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Abstract
In order to eliminate a mechanically movable section, such as a rotation mechanism of a diffraction grating, to achieve a compact fabrication of the whole apparatus, and to realize stable action for selecting a wavelength, a laser oscillator selecting a wavelength in a wavelength-tunable laser is composed of a laser resonator consisting of a mirror on the input side and a mirror on the output side; a laser medium which is placed in the laser resonator and can oscillate in a predetermined range of wavelengths; a crystal to which is piezoelectric element is attached, the crystal receiving acoustic waves from the piezoelectric element in accordance with a desired wavelength; and a polarizing plate which is placed in the laser resonator and transmits only the output light beam having a prescribed plane of polarization or having a prescribed direction of light propagation among the output light beams from the laser medium. The apparatus thereby outputs only the desired wavelength.
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