| 摘要 |
A tunable laser including an optical gain medium, a diffraction grating, and a tuning mechanism. In general, the optical gain medium is configured to emit a light beam from a front facet and a laser beam from a rear facet. The diffraction grating includes a concave reflective diffractive surface positioned to receive the light beam, and is configured to reflect light of a selected wavelength to the front facet of the optical gain medium. The tuning mechanism is configured to adjust the relative position of the optical gain medium and the diffraction grating.
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