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Opt. Lett., Vol. 12, No. 11. (1 November 1987), pp. 876-878, doi:10.1364/ol.12.000876 Key: citeulike:4085466
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With simple optical geometries a separate resonant Fabry–Perot cavity can serve as an optical feedback element that forces a semiconductor laser automatically to lock its frequency optically to the cavity resonance. This method is used to stabilize laser frequencies and reduce linewidths by a factor of 1000 from 20 MHz to approximately 20 kHz.
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