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Optics Letters

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  • Vol. 11, Iss. 5 — May. 1, 1986
  • pp: 300–302

Operation of continuous-wave 12-μm Raman lasers in NH3 with pump offsets as large as 1.35 GHz

D. F. Kroeker, J. Reid, B. K. Garside, and C. Rolland  »View Author Affiliations


Optics Letters, Vol. 11, Issue 5, pp. 300-302 (1986)
http://dx.doi.org/10.1364/OL.11.000300


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Abstract

Four transitions from a cw CO2 laser were used to pump pure NH3 and obtain cw lasing in the 12-μm region. The pump frequencies were offset by as much as 1.35 GHz from the absorbing transitions in NH3, and a Raman process was generally responsible for the 12-μm gain. At high pump intensity several watts of 12-μm output were obtained, while threshold operation was achieved with less than 1 W of pump power.

© 1986 Optical Society of America

History
Original Manuscript: December 16, 1985
Manuscript Accepted: February 10, 1986
Published: May 1, 1986

Citation
D. F. Kroeker, C. Rolland, J. Reid, and B. K. Garside, "Operation of continuous-wave 12-μm Raman lasers in NH3 with pump offsets as large as 1.35 GHz," Opt. Lett. 11, 300-302 (1986)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-11-5-300


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References

  1. C. Rolland, J. Reid, B. K. Garside, Appl. Phys. Lett. 44, 725 (1984). [CrossRef]
  2. C. Rolland, J. Reid, B. K. Garside, Appl. Phys. Lett. 44, 380 (1984). [CrossRef]
  3. K. J. Siemsen, J. Reid, D. J. Danagher, “Improved cw lasers in the 11- to 13-μm wavelength region produced by optically pumping NH3,” Appl. Opt. (to be published).
  4. K. J. Siemsen, J. Reid, Opt. Lett. 10, 594 (1985). [CrossRef] [PubMed]
  5. C. Rolland, J. Reid, B. K. Garside, H. D. Morrison, P. E. Jessop, Appl. Opt. 23, 87 (1984). [CrossRef] [PubMed]
  6. H. D. Morrison, Ph.D. dissertation (McMaster University, Hamilton, Ont., Canada, 1984).
  7. E. M. Frank, C. O. Weiss, K. J. Siemsen, M. Grinda, G. D. Willenberg, Opt. Lett. 7, 96 (1982). [CrossRef] [PubMed]
  8. P. K. Gupta, A. K. Kar, M. R. Taghizaden, R. G. Harrison, Appl. Phys. Lett. 39, 32 (1981). [CrossRef]
  9. C. Rolland, J. Reid, B. K. Garside, IEEE J. Quantum Electron. QE-18, 182 (1982). [CrossRef]
  10. Calculations based on the model described in Ref. 5 predict that the round-trip gain with 30-W pump power is ~8%, just sufficient to overcome mirror and waveguide losses.
  11. C. Rolland, B. K. Garside, J. Reid, Appl. Opt. 24, 13 (1985). [CrossRef] [PubMed]
  12. R. L. Poynter, J. S. Margolis, Mol. Phys. 51, 393 (1984). [CrossRef]
  13. F. W. Taylor, J. Quant. Spectrosc. Radiat. Transfer 13, 1181 (1973). [CrossRef]
  14. J. Reid, K. J. Siemsen, J. Appl. Phys. 48, 2712 (1977). [CrossRef]
  15. T. A. Znotins, J. Reid, B. K. Garside, E. A. Ballik, Opt. Lett. 5, 528 (1980). [CrossRef] [PubMed]
  16. For these measurements the chopper shown in Fig. 1 was operated with a 20:1 duty cycle to prevent optical damage to the AOM. Identical results were obtained with a 10:1 duty cycle, and no thermal problems are expected even in true cw operation.1 All measured powers are converted to the cw value.
  17. Clearly the optimum offset will depend on the available pump power. It is somewhat fortuitous that the optimum offset for ~30-W pump power appears to be close to 180 MHz—the value used by Rolland et al. in their original experiments on cw Raman lasing.1 When much more power is available, as is the case with pulsed CO2 lasers, efficient lasing has been attained with an offset of 1.35 GHz,8 and lasing has been achieved with offsets as large as 5 GHz.6

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