External Cavity Laser
First Claim
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1. An external cavity laser comprising:
- a gain medium having a highly reflective facet and a highly transmissive facet a cavity phase adjustor;
a retro-reflective etalon comprising;
(a) the first linear polarizer (if the emission light from the gain medium is substantially polarized, this polarizer is not necessary), the first quarter waveplate, the etalon filter, the second quarter waveplate, the second linear polarizer, the end mirror reflector;
(b) the end reflector arranged in substantial or perfect parallel to the etalon filter;
(c) the optical axes of the two quarter waveplates arranged in parallel or perpendicular;
(d) the first quarter waveplate to rotate the polarization of the light reflected from the etalon and the first polarizer to absorb the light;
(e) the second quarter waveplate to rotate the polarization of the light reflected from the etalon and the second polarizer to absorb the light;
the highly transmissive facet of the gain medium facing the retro-reflective etalon;
the light reflected back from the retro-reflective etalon being fed back into said gain medium;
the output light of the said laser from the end reflector of the retro-reflective etalon and the highly reflective facet of the gain medium.
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Abstract
An laser cavity including a special wavelength selection filter is disclosed. The special wavelength selection filter comprises of one or two linear polarizer, two quarter waveplates, an etalon filter and an end reflector. The laser may oscillate on single wavelength or multiple wavelengths depending on the selection of the end reflector and the etalon filter. The laser is designed very compact without a wavelength locker to have a stable wavelength output.
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Citations
11 Claims
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1. An external cavity laser comprising:
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a gain medium having a highly reflective facet and a highly transmissive facet a cavity phase adjustor;
a retro-reflective etalon comprising;
(a) the first linear polarizer (if the emission light from the gain medium is substantially polarized, this polarizer is not necessary), the first quarter waveplate, the etalon filter, the second quarter waveplate, the second linear polarizer, the end mirror reflector;
(b) the end reflector arranged in substantial or perfect parallel to the etalon filter;
(c) the optical axes of the two quarter waveplates arranged in parallel or perpendicular;
(d) the first quarter waveplate to rotate the polarization of the light reflected from the etalon and the first polarizer to absorb the light;
(e) the second quarter waveplate to rotate the polarization of the light reflected from the etalon and the second polarizer to absorb the light;
the highly transmissive facet of the gain medium facing the retro-reflective etalon;
the light reflected back from the retro-reflective etalon being fed back into said gain medium;
the output light of the said laser from the end reflector of the retro-reflective etalon and the highly reflective facet of the gain medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification