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22 February 2006 Hybrid ECL/DBR wavelength and spectrum stabilized lasers demonstrate high power and narrow spectral linewidth
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Abstract
The use of LiNbO3 based Volume Holographic Gratings (VHGs) to provide spectrally filtered feedback to a semiconductor laser diode was documented in the mid 1980s1, however issues with long term stability had left this technology on the sidelines. Photo-sensitive glass based VHGs do not exhibit long term aging or thermal/photo bleaching effects, and therefore have enabled a new type of External Cavity Laser (ECL). This highly manufacturable "hybrid ECL/DBR" (HECL) laser utilizes precision VHGs and has been used to create high performance lasers with spectrally tailored output. Lasers with fiber coupled output powers in excess of 4.2 W and spectral line widths of less than 0.15 nm have been demonstrated. Additionally, multi-mode lasers have been developed for High Resolution Raman Spectroscopy that exhibit spectral line widths below 0.06 nm (i.e. < 1 wavenumber) with fiber coupled output power in excess of 350 mW. The use of glass based VHGs provides HECL laser wavelength stabilization of better than 0.01 nm/oC, and allows the production of lasers at virtually any wavelength between 650 nm - 2400 nm.
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Scott L. Rudder, John C. Connolly, and Gregory J. Steckman "Hybrid ECL/DBR wavelength and spectrum stabilized lasers demonstrate high power and narrow spectral linewidth", Proc. SPIE 6101, Laser Beam Control and Applications, 61010I (22 February 2006); https://doi.org/10.1117/12.646791
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