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A frequency stabilization system for semiconductor lasers is described which makes use of a Fiber-Fabry-Perot (FFP) as frequency reference element. The FFP is fabricated from a 3 cm length piece of monomode fiber thus allowing for a compact “all fiber” packaging of the optical part of the system. The electronics includes laser diode and FFP temperature stabilization (± 1 mK) as well as a laser current modulation technique with phase sensitive detection and current control in order to stabilize the laser wavelength to the peak of the FFP transmission curve. Stability of 500 kHz (peak to peak) with respect to the FFP reference is demonstrated as well as insensitivity of this stabilization against substantial variations of the optical intensity coupled into the system.

Intensity-Independent Frequency Stabilization of Semiconductor Lasers Using a Fiber Optic Fabry-Perot Resonator