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Proceedings Paper

469-nm fiber laser source
Author(s): Alex Drobshoff; Jay Walter Dawson; Deanna Marie Pennington; Stephen A. Payne; Raymond Beach; Luke Taylor
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Paper Abstract

We have demonstrated 466 mW of 469 nm light from a frequency doubled continuous wave fiber laser. The system consisted of a 938 nm single frequency laser diode master oscillator, which was amplified in two stages to 5 Watts using cladding pumped Nd 3+ fiber amplifiers and then frequency doubled in a single pass through periodically poled KTP. The 3 cm long PPKTP crystal was made by Raicol Crystals Ltd. with a period of 5.9 μm and had a phase match temperature of 47 degrees Centigrade. The beam was focused to a 1/e2 diameter in the crystal of 29 μm. Overall conversion efficiency was 11% and the results agreed well with standard models. Our 938 nm fiber amplifier design minimizes amplified spontaneous emission at 1088 nm by employing an optimized core to cladding size ratio. This design allows the 3-level transition to operate at high inversion, thus making it competitive with the 1088 nm 4-level transition. We have also carefully chosen the fiber coil diameter to help suppress propagation of wavelengths longer than 938 nm. At 2 Watts, the 938 nm laser had an M2 of 1.1 and good polarization (correctable with a quarter and half wave plate to >10:1).

Paper Details

Date Published: 22 April 2005
PDF: 6 pages
Proc. SPIE 5709, Fiber Lasers II: Technology, Systems, and Applications, (22 April 2005); doi: 10.1117/12.591171
Show Author Affiliations
Alex Drobshoff, Lawrence Livermore National Lab. (United States)
Jay Walter Dawson, Lawrence Livermore National Lab. (United States)
Deanna Marie Pennington, Lawrence Livermore National Lab. (United States)
Stephen A. Payne, Lawrence Livermore National Lab. (United States)
Raymond Beach, Lawrence Livermore National Lab. (United States)
Luke Taylor, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 5709:
Fiber Lasers II: Technology, Systems, and Applications
L. N. Durvasula; Andrew J. W. Brown; Johan Nilsson, Editor(s)

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