469nm Fiber Laser Source
- Resource Type
- Conference
- Authors
- Source
- Conference: Presented at: SPIE Photonics West 2005 Symposium, San Jose, CA (US), 01/22/2005--01/27/2005; Other Information: PBD: 20 Jan 2005
- Subject
- 42 ENGINEERING
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS AMPLIFIERS
DESIGN
EFFICIENCY
FIBERS
LASERS
PLATES
POLARIZATION
STANDARD MODEL
WAVELENGTHS
- Language
- English
We have demonstrated 466mW of 469nm light from a frequency doubled continuous wave fiber laser. The system consisted of a 938nm single frequency laser diode master oscillator, which was amplified in two stages to 5 Watts using cladding pumped Nd{sup 3+} fiber amplifiers and then frequency doubled in a single pass through periodically poled KTP. The 3cm long PPKTP crystal was made by Raicol Crystals Ltd. with a period of 5.9 {micro}m and had a phase match temperature of 47 degrees Centigrade. The beam was focused to a 1/e{sup 2} diameter in the crystal of 29 {micro}m. Overall conversion efficiency was 11% and the results agreed well with standard models. Our 938nm fiber amplifier design minimizes amplified spontaneous emission at 1088nm 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 1088nm 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 938nm laser had an M{sup 2} of 1.1 and good polarization (correctable with a quarter and half wave plate to >10:1).