High-stability, high-beam-quality, and pulse-width-tunable 1319  nm laser system for VISAR applications in high-power laser facilities

Abstract

A high-energy, high-beam-quality, and pulse-width-tunable Nd:YAG laser system, pumped by vertical cavity surface emitting laser arrays and laser diodes, is demonstrated and applied to a velocity interferometry system for any reflector (VISAR) application in a high power laser facility. A multistage multipass amplification structure is used to fully extract the amplifier energy and obtain a high-energy pulse. The temporal waveform is compensated to provide a square waveform, with a flatness less than 8% (peak-to-peak value). The peak power is greater than 100 kW with a frequency-doubling efficiency of 25% for a 50 ns pulse width. The laser operates as a single shot with 1–5 Hz repetition frequency and 0.7% rms energy stability.

Partially end-pumped 1319 nm Nd:YAG slab laser

“…1319 nm and 1338 nm possess approximate effective stimulated emission cross sections and only one fifth that of the 1064 nm wavelength. Thus, laser output at 1319nm is hardly ever achieved directly and usually requires methods like reasonable design of the laser-cavity mirror coating 2 , inserting the solid etlon 4,5 or utilizing the dichroic mirror technology 6,7 . In addition, there is a significant thermal gradient in conventional rod crystal media under high pump power, resulting in thermal lens effect and thermal depolarization 8 .…”

1319 nm single-frequency injection seeded Q-switched laser based on ramp-hold-fire

“…One of the main ways to generate 589 nm laser is the sum frequency generation of 1064 nm laser and 1319 nm laser. The main technologies to generate 1319 nm laser with nanosecond pulse duration single-frequency include injection seeded technology [9] and 1319 nm single-frequency continuous wave seed laser external modulation by acousto-optic modulator (AOM) to generate single-frequency nanosecond laser, and then achieve high energy through multi-stage amplification [10][11] . Compared with the injection seeded technology, the output energy of the singlefrequency pulse laser generated by external modulation is micro-joule level.…”

Hybrid Resonator 1319 nm Nd:YAG InnoSlab Laser

“…Therefore, it is challenging to directly obtain the high-power 1319 nm single-wavelength laser output, attributed to the mode competition effect. In recent years, the exploration of 1319 nm laser output was accelerated by the reasonable design of the laser-cavity mirror coating [1], utilizing the dichroic mirror technology [4,5] or inserting the solid etalon [6,7], suppressing the oscillations of undesired laser lines to realize single wavelength operation.…”