Diode laser-frequency stabilization by use of frequency modulation by a vibrating mirror

Abstract

Modulation of a laser frequency with a negligibly small residual amplitude modulation component has been demonstrated with a piezoelectric transducer-driven mirror. The vibrating-mirror method has been successfully applied to high-resolution spectroscopy of saturated absorption and to laser-frequency stabilization. The bandwidth of the stabilization feedback loop as wide as 15 kHz has been achieved to suppress acoustic noise in ordinary laboratory environment.

Controlling chaos in some laser systems via variable coupling and feedback time delays

“…It is also noted that modulation of the time delay can be achieved by a vibrating mirror, e.g. with a piezoelectric transducer-driven mirror [45].…”

Frequency Stabilization of a Laser Diode with Use of Light-Induced Birefringence in an Atomic Vapor

“…Although this diagnosis does not always correspond to the frequency fluctuation directly, it is simple and useful. 3,4 When the averaging time was 2 s, the best stability was obtained as 8 ϫ 10 Ϫ14 , which corresponds to a fluctuation of 30 Hz. For a longer term ͑Ͼ1 hour͒, however, drift of the zerosignal level, which is caused mainly by an additional polarization rotation independent of the atomic birefringence, becomes a major problem.…”

“…A dispersionlike signal at the resonance frequency is often required to lock the laser frequency to the center of the atomic spectra with electronic servo controls. The most popular way to obtain this signal is through phase-sensitive detection with frequency modulation spectroscopy, [1][2][3][4] by which the first derivative of absorption profiles can be obtained. This enables us to easily achieve a high signal-to-noise ͑S͞N͒ ratio.…”

Velocity Selective Polarization Spectroscopy for Modulation-Free Dispersion Signals at Detuned Frequencies

“…Error signal for frequency stabilization is typically achieved by using dispersion or dispersion-like spectra because these spectra are zero-crossing at the atom transition frequency and have opposite charge on either side of the frequency fluctuation. The most popular way to obtain the dispersion signal is through phase-sensitive detection with frequency modulation spectroscopy [1,2], by which the first derivative of absorption profiles can be obtained. However, the frequency bandwidth of the locked laser could be limited by both the modulation ranges in frequency and the time constant of a lock-in phase-sensitive detector.…”