Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 28: Poster Festkörperlaser
Q 28.1: Poster
Dienstag, 20. März 2007, 16:30–18:30, Poster C
Ranging with Frequency-shifted Feedback Laser — •vladimir ogurtsov1, leonid yatsenko1, vladimir khodakovskyy1, bruce shore2, gerd bonnet2, and klaas bergmann2 — 1Institute of Physics, Ukrainian Academy of Sciences, Ukraine — 2Department of Physics, University of Kaiserslautern, Kaiserslautern
We present experimental characteristics of an Yb3+-doped fiber ring laser operating with frequency-shifted feedback (FSF) through an acousto-optic modulator (AOM) and seeded by both a stationary continuous-wave (CW) laser and spontaneous emission. We show the spectrum and output characteristics for operations with several effective gain bandwidths created by Fabry-Perot etalons inside the cavity and compare spectral parameters with theoretical estimation. The experimental results are in excellent quantitative agreement with the theory developed earlier [L. Yatsenko, et al., Opt. Comm. 236, 183-202 (2004)]. We also demonstrate that the FSF laser, when seeded by a phase-modulated narrow-band radiation field, is a powerful tool for distance measurements to accuracy better than 10 µm and resolution better than 100 µm, for distances of a few meters. The amplitude of the output-signal modulation exhibits a resonance for every distinct signal delay, i.e. for each distinct distance within the laser spot on the target. The use of a phase-modulated input seed allows one to use a very narrow-bandwidth filter when measuring the return signal. These results are in excellent agreement with previous theoretical predictions [L. Yatsenko et al., Opt. Comm. 242, 581 (2004)].