100-watt fiber-based green laser with near diffraction-limited beam quality
2010
An air-cooled, light-weight, fiber-based, high power green laser has been prototyped. The system consists of an all-fibercoupled
IR pump laser at 1064 nm and a frequency-conversion module in a compact and flexible configuration. The IR
laser operates in QCW mode, with 10 MHz pulse repetition frequency and 3-5 ns pulse width, to generate sufficient peak
power for frequency doubling in the converter module. The IR laser can produce more than 200 W in a linearlypolarized
diffraction-limited output beam with high spectral brightness for frequency conversion. The converter module
has an input telescope and an oven with a nonlinear crystal to efficiently convert the 1064-nm IR fiber laser output to
532-nm green output. The IR laser and conversion module are connected via a stainless-steel protected delivery fiber for
optical beam delivery and an electrical cable harness for electrical power delivery and system control. The beam quality
of the 532 nm output remains near diffraction-limited, with M 2 <1.4. Up to 101 W of 532 nm output was demonstrated
and multi-hour runs were characterized at 75 W output. The weights of the IR laser package and doubler are 69 lbs and
14 lbs respectively. An overview of the system and full characterization results will be presented. Such compact, highbrightness
green laser sources are expected to enable various scientific, defense and industrial applications.
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