97-μJ single frequency linearly polarized nanosecond pulsed laser at 775 nm using frequency doubling of a high-energy fiber laser system 
Date: Aug 26, 2017
We report a high-energy (∼97 μJ), high-peak power (∼20 kW), single-frequency, linearly polarized, near diffraction-limited (M2<1.2) ∼4.8-ns pulsed laser source at 775 nm with a 260-Hz repetition rate. This laser was achieved by frequency doubling of a high-energy linearly polarized all-fiber-based master oscillator–power amplifier, seeded by a single-frequency <a href="http://ldselection.com/tutorial/category-of-laser-diode/chapter3-category-of-laser-diode/#3.2">semiconductor distributed feedback laser diode</a> at 1550 nm. The frequency doubling is implemented in a single-pass configuration using a periodically poled lithium niobate crystal, and a conversion efficiency of 51.3% was achieved.