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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 11 — Nov. 1, 2007
  • pp: 2893–2898

Mode-locked Raman laser in H 2 pumped by a mode-locked external-cavity diode laser

Yihan Xiong, Sytil Murphy, Paul Nachman, Kevin S. Repasky, and J. L. Carlsten  »View Author Affiliations


JOSA B, Vol. 24, Issue 11, pp. 2893-2898 (2007)
http://dx.doi.org/10.1364/JOSAB.24.002893


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Abstract

We experimentally demonstrate a far-off resonant mode-locked Raman laser at 1196 nm pumped by an actively mode-locked external-cavity diode laser (ML-ECDL) at 799 nm . Using the Pound–Drever–Hall locking technique, we simultaneously frequency locked all the longitudinal modes from the ML-ECDL to a high-finesse Raman cavity filled with diatomic hydrogen ( H 2 ) . When operating at an average power level slightly above the mode-locked (ML) threshold (which is comparable to the cw threshold), each of the nine pump modes, taken on its own, is below the cw lasing threshold. However, since the modes are in-phase, they can augment each other through four-wave-mixing processes, causing all of them to lase. The measured threshold for this process is approximately 5.4 mW . The FWHM of the ML Stokes output is 310 ps .

© 2007 Optical Society of America

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3550) Lasers and laser optics : Lasers, Raman
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.4780) Lasers and laser optics : Optical resonators
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.5650) Nonlinear optics : Raman effect

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: May 26, 2007
Manuscript Accepted: July 25, 2007
Published: October 31, 2007

Citation
Yihan Xiong, Sytil Murphy, Paul Nachman, Kevin S. Repasky, and J. L. Carlsten, "Mode-locked Raman laser in H2 pumped by a mode-locked external-cavity diode laser," J. Opt. Soc. Am. B 24, 2893-2898 (2007)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-24-11-2893


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References

  1. J. K. Brasseur, P. A. Roos, K. S. Repasky, and J. L. Carlsten, "Characterization of a continuous-wave Raman laser in H2," J. Opt. Soc. Am. B 8, 1305-1312 (1999). [CrossRef]
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  17. Manufacturer's data show Rp(s)≈0.99980, Tp=40+/-5 ppm, and Ts=30+/-5 ppm.
  18. We see eight harmonic beat signals from the pump source through the rf spectrum analyzer, so the number of pump mode is at least nine.
  19. The power ratio of these nine pump modes can get through scanning the HFC to resolve different modes when mismatching the rf synthesizer signal to the FSR of HFC. The ratio we use here is 0.4315:0.2538:0.2031:0.0761:0.01692:0.0152: 0.0017:0.0008:0.0008.
  20. J. K. Brasseur, P. A. Roos, L. S. Meng, and J. L. Carlsten, "Frequency tuning characteristics of a continuous-wave Raman laser in H2," J. Opt. Soc. Am. B 7, 1229-1232 (2000). [CrossRef]

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