Abstract
Frequency-stable operation of an extended-cavity GaN diode laser was achieved by resonant optical feedback from a confocal cavity. The observed frequency fluctuations were smaller than 300 kHz peak-to-peak in one second, and the upper limit of the linewidth was measured to be 880 kHz. A continuous frequency scan up to 5 GHz was realized by simultaneous servo control on the optical feedback phase and on the extended-cavity diode laser frequency. The violet laser was used to perform saturation spectroscopy on the 5 2 S 1/2–6 2 P 3/2 transition of rubidium at 420 nm in a gas cell, and resulted in spectra with a linewidth of 2.3 MHz.
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