| 摘要 |
A tunable laser has a gain material and a mirror defining an external resonant cavity. A tunable Fabry-Perot etalon disposed along the optical path between the mirror and the gain material includes a liquid crystal layer having a variable refractive index to tune the transmission peaks of the etalon and the resonant frequency of the laser resonant cavity. A second etalon having a fixed set of transmission peaks can also be included in the laser resonant cavity. The tunable etalon is then tuned to select a resonant frequency corresponding to one of the transmission peaks of the fixed etalon.
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