22 April 2005 469-nm fiber laser source
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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).
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Alex Drobshoff, Alex Drobshoff, Jay Walter Dawson, Jay Walter Dawson, Deanna Marie Pennington, Deanna Marie Pennington, Stephen A. Payne, Stephen A. Payne, Raymond Beach, Raymond Beach, Luke Taylor, Luke Taylor, } "469-nm fiber laser source", Proc. SPIE 5709, Fiber Lasers II: Technology, Systems, and Applications, (22 April 2005); doi: 10.1117/12.591171; https://doi.org/10.1117/12.591171
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