Frequency Stabilization of Highly Coherent AlGaAs Diode Lasers
A solitary diode laser (DL) as compared with a typical gas laser has a large spectral linewidth which limits the attainable frequency stability /1/. One of the most efficient ways to narrow spectral line of a DL is an external optical feedback /2,3/, which makes it possible to decrease the linewidth to 1 kHz /4,5/. An external cavaty diode laser (ECDL) has many advantages but is more complicated than a solitary DL; the first work on DL frequency stabilization /6/ was followed by experiments on ECDL stabilization 12 years later /7/. Here we report on two experiments in which: a fast technique of side-band spectroscopy has been used for an ECDL frequency stabilization to reflection resonance of a confocal interferometer /8/; two ECDLs have been locked to adjacent sub-Dopplerresonances in saturated absorption of 133Cs by using conventional lock in servo systems, and DL frequency stability was estimated on the direct measurement of beat frequency fluctuations /9/.
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