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22 March 2007 Rb-saturated absorption profile-based enhancement of semiconductor laser frequency stability
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Abstract
Laser interferometers detect gravitational waves with a degree of accuracy and efficiency unimaginable even a few years ago. The semiconductor lasers that are the primary light source for these devices are small, lightweight, durable and energy-efficient. On the downside, the devices currently available are still marked by broad oscillation spectra, and heightened sensitivity to fluctuations in injection current and /or ambient temperature. By applying a small sine wave to the injection current, we modulate the oscillation frequency. This frequency-modulated beam is introduced to the Avalanche photo diode through the Rb cell in the saturated absorption optical setup. The resulting signal and a reference signal are detected simultaneously and combined, to produce an error signal, which, when fed back to the injection current, stabilizes the diode's oscillation frequency at 2.12x10-12 ⩽ &sgr;(2,τ) ⩽ 5.88x10-11 in the averaging time between 0.4s to 65s. An optical feedback method, which introduces the laser beam reflected by a mirror or a grating to the semiconductor laser itself, is reported to narrow oscillation linewidth and improve frequency stability. We are now combining these two techniques to further improve frequency stability.
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K. Nakano, S. Maehara, M. Yanagisawa, Y. Sekiya, T. Sato, M. Ohkawa, T. Maruyama, and S. Kawamura "Rb-saturated absorption profile-based enhancement of semiconductor laser frequency stability", Proc. SPIE 6468, Physics and Simulation of Optoelectronic Devices XV, 64680C (22 March 2007); https://doi.org/10.1117/12.698300
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