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We developed a fast wavelength switchable external cavity diode laser (ECDL) using a DMD as a seed laser for an injection-seeded terahertz (THz) wave parametric generator (is-TPG). Generally, the wavelength of an ECDL is selected by the angle of the mirror or grating; however, in this case, a DMD is used as the wavelength selector. A power output of 300 mW and a tunable range of 26 nm were obtained. Furthermore, high-rate modulation at 6.55kHz was realized. This laser makes it possible to switch the THz wavelengths of is-TPG rapidly to match the absorption spectrum of a reagent.
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Sota Mine, Kodo Kawase, Kosuke Murate, "Fast wavelength switchable external cavity diode laser using digital micromirror device," Proc. SPIE 11667, Components and Packaging for Laser Systems VII, 1166709 (5 March 2021); https://doi.org/10.1117/12.2577932