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Tunable continuous-wave dual-wavelength laser by external-cavity superluminescent diode with a volume Bragg grating and a diffraction grating
K. Vizbaras, E. Dvinelis, I. Simonyte, A. Trinkunas, M. Greibus, R. Songaila, T. Zukauskas, M. Kausylas, and A. Vizbaras, Appl. Phys. Lett. 107, 011103 (2015).
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K. Vijayraghavan, Y. Jiang, M. Jang, A. Jiang, K. Choutagunta, A. Vizbaras, F. Demmerle, G. Boehm, M. C. Amann, and M. A. Belkin, Nat. Commun. 4, 2021 (2013).
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We demonstrate the tunable continuous-wave dual-wavelength laser based on a double external-cavity superluminescent diode (SLD). The double external cavity consisted of a volume Bragg grating (VBG) and a diffraction grating bracketing the SLD's two facets. The VBG was used as an output coupler to enable the external-cavity SLD to achieve a stable wavelength. A narrow bandwidth of 0.25 nm was achieved in single-wavelength operation. The diffraction grating served as an end mirror to create another tunable wavelength external cavity for the SLD. A wavelength tuning range of 23 nm was achieved. The laser output of the double external-cavity SLD had a tunable spectral separation with dual-wavelengths from +6.42 to −16.94 nm. An output power of up to 37.7 mW was achieved with a frequency difference of 7.1 THz.
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