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21 April 2017 100μJ-level single frequency linearly-polarized nanosecond pulsed laser at 775 nm (Conference Presentation)
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We report a single frequency, linearly polarized, near diffraction-limited, pulsed laser source at 775 nm by frequency doubling a single frequency nanosecond pulsed all fiber based master oscillator-power amplifier, seeded by a fiber coupled semiconductor DFB laser diode at 1550 nm. The laser diode was driven by a pulsed laser driver to generate ~ 5 ns laser pulses at 260 Hz repetition rate with ~ 50 pJ pulse energy. The pulse energy was boosted to ~ 200 μJ using two stages of core-pumped fiber amplifiers and two stages of cladding-pumped fiber amplifiers. The multi-stage synchronous pulse pumping technique was adopted in the four stages of fiber amplifiers to mitigate the ASE. The frequency doubling is implemented in a single pass configuration using a periodically poled lithium niobate (PPLN) crystal. The crystal is 3 mm long, 1.4 mm wide, 1 mm thick, with a 19.36 μm domain period chosen for quasi-phase matching at 33°C. It was AR coated at both 1550 nm and 775 nm. The maximum pulse energy of ~ 97 μJ was achieved when ~ 189 μJ fundamental laser was launched. The corresponding conversion efficiency is about 51.3%. The pulse duration was measured to be 4.8 ns. So the peak power of the generated 775 nm laser pulses reached ~20 kW. To the best of our knowledge, this is the first demonstration of a 100 μJ-level, tens of kilowatts-peak-power-level single frequency linearly polarized 775 nm laser based on the frequency doubling of the fiber lasers.
Conference Presentation
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wei Shi, Qiang Fang, Jingli Fan, Xuelong Cui, Zhuo Zhang, Jinhui Li, and Guoqing Zhou "100μJ-level single frequency linearly-polarized nanosecond pulsed laser at 775 nm (Conference Presentation)", Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 1008806 (21 April 2017);

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