What is to the authors' knowledge the first experimental demonstration of a nonresonant cw Raman laser pumped by a tunable external-cavity diode laser (ECDL) is presented. The ECDL is phase-frequency locked to a high-finesse Raman laser cavity containing diatomic hydrogen (H2) by the Pound–Drever–Hall locking technique. The Stokes lasing threshold occurs at a pump power of 400 ± 30 μW, and a maximum photon conversion efficiency of 12.0 ± 1.3% is achieved at 1.6 mW of pump power. A 40-nm tuning range of the cw Stokes emission, 1174–1214 nm, is obtained by tuning of the wavelength of the ECDL pump source.
© 2000 Optical Society of America
(140.3550) Lasers and laser optics : Lasers, Raman
(140.3600) Lasers and laser optics : Lasers, tunable
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(300.6340) Spectroscopy : Spectroscopy, infrared
L. S. Meng, K. S. Repasky, P. A. Roos, and J. L. Carlsten, "Widely tunable continuous-wave Raman laser in diatomic hydrogen pumped by an external-cavity diode laser," Opt. Lett. 25, 472-474 (2000)