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Optics and Spectroscopy

Control of Emission Spectrum of a Diode Laser under VHF Modulation of Injection Current

Савинов Константин Николаевич, А. К. Дмитриев, A. A. Rundau

Published Jul 1, 2021• 3 citations
Publisher

Abstract

Abstract Results of investigation of mechanisms of controlling intervals between pairs of VHF components at spectral sidebands near the frequency of clock transition of rubidium are presented.
DOI
10.1134/s0030400x21060138

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The spatial coherence of a light source can be easily controlled by varying the source size. The temporal coherence of a light source, on the other hand, has proved to be much more difficult to control. The dependence of the laser diode emission wavelength on temperature offers an opportunity for direct control of their temporal coherence. By modulating the Injection current, temperature fluctuations in the semiconductor junction produce a controlled wavelength drift In the emitted radiation. The amount of wavelength drift can be varied by regulating the depth and period of the modulation which over the integration period translates into variable spectral bandwidths. Thus, a wide range of temporal coherence lengths can be synthesized by appropriately modulating the laser diode current. Possible applications of the technique are described.
Frequency-modulation (FM) spectroscopy has been performed on the D(2) transitions of rubidium atoms with an AlGaAs diode laser at 780 nm. Doppler-broadened hyperfine-structure transitions of (85)Rb and (87)Rb were resolved with no residual amplitude-modulation-induced background signal by modulating the injection current of the laser diode at a low frequency (20-50 MHz) compared with the Doppler width. To obtain Doppler-free spectra, we combined FM spectroscopy with saturation spectroscopy. The results show that the FM spectroscopy technique is sensitive and should be useful for high-resolution spectroscopy, although the resolution was instrument limited and unusual double peaks were observed.
We describe a simple modification to a grating-stabilized diode laser intended for use in neutral atom cooling and trapping. Modulation of the laser diode’s driving current at microwave frequencies induces sidebands in the laser’s spectrum that eliminate the need for a second laser in a trapping apparatus, yielding a considerable savings in effort and cost. A detailed description of the process for selection and assembly of microwave components is given. In an appendix we list the hardware used, with vendor and pricing information.