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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 31 — Nov. 1, 2004
  • pp: 5855–5859

Highly efficient continuous-wave operation of a Nd:YAG rod laser that is side pumped by p-polarized diode laser bars

Ranganathan Kandasamy, Sundar Raghavachari, Puskar Misra, and Sthanu Nathan. T. P  »View Author Affiliations


Applied Optics, Vol. 43, Issue 31, pp. 5855-5859 (2004)
http://dx.doi.org/10.1364/AO.43.005855


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Abstract

We report on the performance of highly efficient, high-power continuous-wave (CW) Nd:YAG lasers that are side pumped by p-polarized diode laser beams. In this configuration pump light is directly coupled into the Nd:YAG rod through a threefold symmetric gold-coated flow tube. The polarization direction of our pump diode bars is perpendicular to the rod’s axis (p-polarized). In a closed coupled resonator, a maximum output power of 195 W in multimode operation is obtained for a pump power of 423 W, which corresponds to an optical-to-optical efficiency of 46% and an electrical-to-optical efficiency of 23%. This is, to the best of our knowledge, the highest electrical-to-optical efficiency reported for a CW diode side-pumped Nd:YAG laser. By the pump-power leakage analysis method, we measured the pumping efficiency to be approximately 94%. The high efficiency of the system can be attributed to wing pumping, which results in uniform pump-light distribution and better pumping efficiency because of the use of p-polarized pump beams.

© 2004 Optical Society of America

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3530) Lasers and laser optics : Lasers, neodymium
(140.5560) Lasers and laser optics : Pumping

History
Original Manuscript: April 15, 2004
Revised Manuscript: July 20, 2004
Manuscript Accepted: July 20, 2004
Published: November 1, 2004

Citation
Ranganathan Kandasamy, Sundar Raghavachari, Puskar Misra, and Sthanu Nathan. T. P, "Highly efficient continuous-wave operation of a Nd:YAG rod laser that is side pumped by p-polarized diode laser bars," Appl. Opt. 43, 5855-5859 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-31-5855

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