We describe a photothermal technique for wavelength modulation of a room-temperature diode laser at modulation frequencies up to a few kilohertz. This photothermal modulation is accomplished by exposing the diode laser to a low-power, amplitude-modulated helium–neon-laser beam. Advantages of photothermal wavelength modulation compared with the typical injection-current wavelength modulation are discussed.
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Klimcak et al. (1988) studied this question.
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