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US 3,938,058 AGranted
Tunable laser
AssigneeHitachi, Ltd.
InventorManabu Yamamoto
Life of this patent
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Abstract
A tunable laser is disclosed in which a plurality of laser beams different from one another in wavelength and polarization can be simultaneously oscillated. The tunable laser is advantageous among others in that an atomic absorption spectroscopic analysis can be carried out with very high sensitivity when it is used as, for example, a light source for two-wavelength measurement in the atomic absorption spectroscopic analysis.
Claims7
A tunable laser comprising:
- an optical resonant cavity capable of supporting a plurality of optical wavelengths within only a selectable prescribed wave number range;
- a laser active medium, disposed within said optical resonant cavity, for producing laser radiation;
- pumping means for exciting said laser active medium, for producing laser radiation at said plurality of optical wavelengths;
- and
- interference means, disposed within said optical resonant cavity in the path of said laser radiation, for permitting passage therethrough of only a pair of said laser wavelengths, the respective polarizations of which are different, said interference means including a pair of reflectors separated from each other by optically anisotropic material, the refractive index of said anisotropic material and the distance between said reflectors being such that the difference in the wave number between said pair of laser wavelengths is less than said prescribed wave number range.
2 more elements
Dependencies are inferred from the claim text.