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Optics Letters

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  • Vol. 25, Iss. 7 — Apr. 1, 2000
  • pp: 472–474

Widely tunable continuous-wave Raman laser in diatomic hydrogen pumped by an external-cavity diode laser

L. S. Meng, K. S. Repasky, P. A. Roos, and J. L. Carlsten  »View Author Affiliations


Optics Letters, Vol. 25, Issue 7, pp. 472-474 (2000)
http://dx.doi.org/10.1364/OL.25.000472


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Abstract

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

OCIS Codes
(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

Citation
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)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-7-472


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References

  1. J. K. Brasseur, K. S. Repasky, and J. L. Carlsten, Opt. Lett. 23, 367 (1998).
  2. K. S. Repasky, L. E. Watson, and J. L. Carlsten, Appl. Opt. 34, 2615 (1995).
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  7. Below the Stokes threshold, the reflected pump power Pr and the transmitted pump power Pt are both linear functions of the incident pump power: Pr=BrPi0 and Pt=BtPi0, where Br=[R(1-T-R)2/(1-R)2]C+R(1-C) and Bt=[T2/(1-R)2]C are two constants related to mirror reflectivity R, transmission T, and cavity coupling efficiency C. From the data below threshold in Fig., we found that Br=0.318±0.0007 and Bt=0.476±0.001. Using R=0.99996±0.00001 measured from cavity ringdown, we can calculate that T=(33±0.1)×10-6 and C=(70.4±0.2)%.
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  11. G. Rempe, R. J. Thompson, and H. J. Kimble, Opt. Lett. 17, 363 (1992). The Stokes cavity ringdown is performed with a laser source at 1178 nm. The mirror reflectivity quoted by the manufacturer (Research ElectroOptics, Inc.) is 0.99995 for both the pump and the Stokes wavelengths.
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