Narrow Pulse Width Green Laser Based on LED‐Pumped Electro‐Optically Q‐Switched Nd:YAG Laser

ABSTRACT In this study, we demonstrate an intracavity frequency‐doubled 532‐nm laser with a high peak power and narrow pulse width based on an LED‐pumped electro‐optically (E‐O) Q‐switched Nd:YAG laser. In the Q‐switched operation mode, a maximum output of 4.35 mJ pulse energy at 1064 nm was obtained at a repetition rate of 200 Hz with a duration of 88 ns and a peak power of 50 kW. By optimizing the incidence angle of the KTP crystal to satisfy the noncritical phase‐matching condition, the output pulse energy for the green laser at 532 nm was 1.55 mJ at a repetition rate of 200 Hz with a duration of 46 ns and a peak power of 33.7 kW by intracavity frequency doubling. To the best of our knowledge, this is the first demonstration of LED‐pumped E‐O Q‐switched 1064‐ and 532‐nm lasers reported to date.