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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 11 — Apr. 10, 2004
  • pp: 2337–2346

Mode behavior in ultralarge ring lasers

Robert B. Hurst, Robert W. Dunn, K. Ulrich Schreiber, Robert J. Thirkettle, and Graeme K. MacDonald  »View Author Affiliations


Applied Optics, Vol. 43, Issue 11, pp. 2337-2346 (2004)
http://dx.doi.org/10.1364/AO.43.002337


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Abstract

Contrary to expectations based on mode spacing, single-mode operation in very large He-Ne ring lasers may be achieved at intracavity power levels up to ∼0.15 times the saturation intensity for the He-Ne transition. Homogeneous line broadening at a high total gas pressure of 4–6 Torr allows a single-peaked gain profile that suppresses closely spaced multiple modes. At startup, decay of initial multiple modes may take tens of seconds. The single remaining mode in each direction persists metastably as the cavity is detuned by many times the mode frequency spacing. A theoretical explanation requires the gain profile to be concave down and to satisfy an inequality related to slope and saturation at the operating frequency. Calculated metastable frequency ranges are >150 MHz at 6 Torr and depend strongly on pressure. Examples of unusual stable mode configurations are shown, with differently numbered modes in the two directions and with multiple modes at a spacing of ∼100 MHz.

© 2004 Optical Society of America

OCIS Codes
(140.3370) Lasers and laser optics : Laser gyroscopes
(140.3560) Lasers and laser optics : Lasers, ring
(140.3570) Lasers and laser optics : Lasers, single-mode

History
Original Manuscript: July 10, 2003
Revised Manuscript: December 19, 2003
Published: April 10, 2004

Citation
Robert B. Hurst, Robert W. Dunn, K. Ulrich Schreiber, Robert J. Thirkettle, and Graeme K. MacDonald, "Mode behavior in ultralarge ring lasers," Appl. Opt. 43, 2337-2346 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-11-2337


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References

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  10. We estimated ρ by noting the beam power level for the onset of multiple longitudinal mode operation and taking this to correspond to the limiting value of ρ for weak saturation, from the gain profile calculations. Other beam powers were then scaled appropriately.
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