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Frequency-doubled Nd:YAG MOPA laser system with programmable rectangular pulses up to 200 microseconds.

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Published on: November 22, 2019

Area of Science:

Lasers and Photonics
Quantum Optics
Materials Science

Background:

Diode-pumped solid-state lasers are crucial for various scientific applications.
Nd:YAG lasers offer excellent performance but require precise pulse shaping for specific applications.
Master-oscillator power-amplifier (MOPA) configurations enhance laser output characteristics.

Purpose of the Study:

To develop a compact, frequency-doubled diode-pumped Nd:YAG laser system.
To achieve programmable microsecond pulse lengths with high energy and stability.
To explore its potential as a pump source for tunable, high-power radiation.

Main Methods:

Utilized analog pulse shaping on a single-frequency continuous-wave Nd:YAG oscillator.
Employed a master-oscillator power-amplifier (MOPA) architecture for amplification.
Implemented second harmonic generation (SHG) using a Lithium Triborate (LBO) crystal.

Main Results:

Generated temporally flat-top 1064 nm pulses (520 mJ, 2.6 kW peak power, 200 μs duration, <10 kHz linewidth) at 2 Hz.
Achieved 532 nm pulses (262 mJ, 1.3 kW peak power) via SHG with a beam quality factor M²=1.41.
Demonstrated high peak power stability (2.9%) and long-term intensity stability (1.1%).

Conclusions:

The developed Nd:YAG MOPA laser system provides programmable microsecond pulses with excellent energy and stability.
The system's output is suitable for pumping other laser systems to generate tunable, high-power radiation.
Potential applications include precision measurements and laser cooling techniques.