Accession Number:

ADA209627

Title:

End-Pumped Nd:BEL Laser Performance.

Descriptive Note:

Professional paper,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Report Date:

1988-09-01

Pagination or Media Count:

6.0

Abstract:

Performance data for a cw NdBEL laser end pumped by two 500 mW laser diode arrays are presented and compared with the performance data for a NdYAG laser in a similar configuration. The phased arrays used as the pump source are cooled by a temperature-controlled heat sink to permit wavelength tunability. Although the absorption bandwidth for NdBEL is substantially broader than for NdYAG, the NdBEL was found to have a higher threshold for lasing. Both rods gave slope efficiencies of 42. The dependence of the output power on output mirror reflectivity was measured, with NdBEL showing a greater sensitivity to reflectivity than NdYAG. The optimum reflectivities were found to be 0.98 for NdBEL and 0.97 for NdYAG. The maximum TEM00 cw power achieved for each rod at these reflectivities was 250 mW for NdBEL and 283 mW for NdYAG. The observed electrical-to-optical conversion efficiency was factored into a product of analytic component terms, and excellent agreement was found between observed and calculated efficiencies. It is concluded that under the conditions used in this work, both BEL and YAG hosts perform comparably. The conditions under which BEL might out-perform YAG as a host for diode-pumped Nd are discussed. Reprints. RH

Subject Categories:

  • Lasers and Masers
  • Atomic and Molecular Physics and Spectroscopy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE