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Yellow laser light generation by frequency doubling of the output from a master oscillator fiber power amplifier system

Ryser, M. ; Marques, C. ; Nogueira, R.N. ; Romano, V.

Yellow laser light generation by frequency doubling of the output from a master oscillator fiber power amplifier system, Proc SPIE Photonics West, San Francisco, United States, Vol. Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 934410, pp. 1 - 4, February, 2015.

Digital Object Identifier: http://dx.doi.org/10.1117/12.2080203

Abstract
We present a power-scalable approach for yellow laser-light generation based on standard Ytterbium (Yb) doped fibers. To force the cavity to lase at 1154 nm, far above the gain-maximum, measures must be taken to fulfill lasing condition and to suppress competing amplified spontaneous emission (ASE) in the high-gain region. To prove the principle we built a fiber-laser cavity and a fiber-amplifier both at 1154 nm. In between cavity and amplifier we suppressed the ASE by 70 dB using a fiber Bragg grating (FBG) based filter. Finally we demonstrated efficient single pass frequency doubling to 577 nm with a periodically poled lithium niobate crystal (PPLN). With our linearly polarized 1154 nm master oscillator power fiber amplifier (MOFA) system we achieved slope efficiencies of more than 15 % inside the cavity and 24 % with the fiber-amplifier. The frequency doubling followed the predicted optimal efficiency achievable with a PPLN crystal. So far we generated 1.5 W at 1154nm and 90 mW at 577 nm. Our MOFA approach for generation of 1154 nm laser radiation is power-scalable by using multi-stage amplifiers and large mode-area fibers and is therefore very promising for building a high power yellow laser-light source of several tens of Watt.