Frequency-doubled Nd:YAG MOPA laser system with programmable rectangular pulses up to 200 microseconds
Abstract
A compact frequency-doubled diode-pumped Nd:YAG master-oscillator power-amplifier laser system with programmable microsecond pulse length has been developed. Analog pulse shaping of the output from a single-frequency continuous-wave Nd:YAG oscillator, and subsequent amplification, allowed the generation of rectangular pulses with pulse lengths on the order of the Nd:YAG fluorescence lifetime. Temporally flat-top pulses of 1064 nm light with 520 mJ pulse energy, 2.6 kW peak power, and 200 μs duration, with linewidth below 10 kHz, were obtained at a repetition rate of 2 Hz. Second harmonic generation in a LBO crystal yielded pulses of 262 mJ and 1.3 kW peak power at 532 nm. The peak power can be maintained within 2.9% over the duration of the laser pulse, and long-term intensity stability of 1.1% was observed. The spatially flat-top beam at 1064 nm used in the amplifier is converted to a Gaussian beam at 532 nm with beam quality factor M2 = 1.41(14) during the second harmonic generation. This system has potential as a pump source for Ti:sapphire, dye, or optical parametric amplifiers to generate tunable high-power single-frequency radiation for applications in precision measurements and laser slowing.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 15, 2021
- Source ID
- 10.1364/oe.427832
Entities
People
- David DeMille
- Eustace R Edwards
- Jack C. Roth
- Maximilian Beyer
Organizations
- Army Research Office
- RTX
- University of California
- University of Chicago
- Vrije Universiteit Amsterdam
- Yale University