Abstract
Stable, narrow linewidth operation of red and 1.3 µm free-running laser diodes with external gratings in non-Littrow geometry is demonstrated. The resonance of the saturated fluorescence of an atomic beam with a contrast of 25% and a linewidth of 400 ± 50 kHz of the Ca intercombination line 41 S 0−43 P 1 (λ = 657 nm) is shown. A high-power (110 mW) single-mode external cavity laser diode at 1.3 µm is used for second-harmonic generation in a KTP crystal. The beat signal (signal to noise ratio about 25 dB) of 10 nW second-harmonic radiation at 1.3 µm and the radiation of a laser diode in the visible spectrum, as a step to realize a frequency chain, is observed.
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Akulshin, A.M., Nakagawa, K. & Ohtsu, M. Frequency chain towards the Ca intercombination line based on laser diodes: First step. Appl. Phys. B 58, 529–532 (1994). https://doi.org/10.1007/BF01081085
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DOI: https://doi.org/10.1007/BF01081085