20 December 2004 Tunable dual-wavelength operation of a diode laser
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Abstract
A tunable multiwavelength laser source can find several applications in spectroscopy, wavelength-division multiplexing and optical metrology. We developed a fabrication technique for holographic gratings designed to allow simultaneous lasing at two wavelengths in Littrow configuration. The design of these gratings is based on recording a constant groove spacing grating and a variable groove spacing grating on the same photoresist. Using the gratings as coupler in the external cavity of a semiconductor laser, we obtained simultaneous laser emission at two wavelengths. The gain medium we used was a commercial laser diode emitting at 675 nm. By translating the grating, we demonstrated tuning of the spectral separation of the dual-wavelength output from 0.8 nm to 6.2 nm. The fabrication technique of holographic gratings and the results obtained with the laser diode will be presented.
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Veronique Zambon, Veronique Zambon, Nathalie McCarthy, Nathalie McCarthy, Michel Piche, Michel Piche, "Tunable dual-wavelength operation of a diode laser", Proc. SPIE 5577, Photonics North 2004: Optical Components and Devices, (20 December 2004); doi: 10.1117/12.567453; https://doi.org/10.1117/12.567453
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