A 527 nm pump laser generating 1.7 mJ energy with peak power of more than 0.12 GW is demonstrated.The theoretical simulation result shows that it has 10^(6) gain in the picosecond-pump optical parametric chirped pulse...A 527 nm pump laser generating 1.7 mJ energy with peak power of more than 0.12 GW is demonstrated.The theoretical simulation result shows that it has 10^(6) gain in the picosecond-pump optical parametric chirped pulse amplification when the pump laser peak power is 0.1 GW and the intensity is more than 5 GW/cm^(2),and that it can limit the parametric fluorescence in the picosecond time scale of pump duration.The pump laser system adopts a master-oscillator power amplifier,which integrates a more than 30 pJ fiber-based oscillator with a 150μJ regenerative amplifier and a relay-imaged four-pass diode-pump Nd glass amplifier to generate a 1 Hz top hat spatial beam and about 14 ps temporal Guassian pulse with<2%pulse-to-pulse energy stability.The output energy of the power amplifier is limited to 4 mJ for B-integral concern,and the frequency doubling efficiency can reach 65%with input intensity 10 GW/cm^(2).展开更多
A special-velocity-matched electro-optic （EO） phase modulator employing a microwave resonant design in lithium niobate is presented. Both the microwave property and phase-modulation performances of the 3.25-GHz modu...A special-velocity-matched electro-optic （EO） phase modulator employing a microwave resonant design in lithium niobate is presented. Both the microwave property and phase-modulation performances of the 3.25-GHz modulator agree well with the numerical simulations. Using this modulator in a single-pass configuration with 1-kW microwave drive power, the spectral bandwidth of a 1053-nm, 3-ns pulse-length laser is broadened to 0.13 nm. With a clear aperture of 5×5 （mm）, the modulator is suited for two- dimensional smoothing by spectral dispersion in high Dower laser systems.展开更多
The experimental performance of beam smoothing by combined one-dimensional （1D） spectral dispersion and lens array （LA） technology is presented, as applied in the ninth beam of SG-II. Using 3w spectral dispersion ...The experimental performance of beam smoothing by combined one-dimensional （1D） spectral dispersion and lens array （LA） technology is presented, as applied in the ninth beam of SG-II. Using 3w spectral dispersion with a bandwidth of 270 GHz and a line dispersion that is 24.9 times the beam＇s diffraction- limited width decreases the focal spot non-uniformity of 80% energy concentration from 46% to 17%. The multiple-beam interference properties of the LA are theoretically and experimentally validated by spatial power spectral density analysis. Peak-spectra suppression ratios of 20 and 10 dB are achieved in the dispersion and orthogonal directions, respectively.展开更多
A 95 W Nd：YAG laser system pumped by a vertical cavity surface emitting laser（VCSEL） array is described.The laser contains an all-fiber-based seeder, an Nd：YAG regenerative amplifier, and a four-pass amplifier. Th...A 95 W Nd：YAG laser system pumped by a vertical cavity surface emitting laser（VCSEL） array is described.The laser contains an all-fiber-based seeder, an Nd：YAG regenerative amplifier, and a four-pass amplifier. The laser operates at 300 Hz with energies up to 317 m J. The beam has a top-hat intensity distribution. The temporal pulse shape is flat in time, and the pulse width can be adjusted in the range of 2–6 ns.展开更多
文摘A 527 nm pump laser generating 1.7 mJ energy with peak power of more than 0.12 GW is demonstrated.The theoretical simulation result shows that it has 10^(6) gain in the picosecond-pump optical parametric chirped pulse amplification when the pump laser peak power is 0.1 GW and the intensity is more than 5 GW/cm^(2),and that it can limit the parametric fluorescence in the picosecond time scale of pump duration.The pump laser system adopts a master-oscillator power amplifier,which integrates a more than 30 pJ fiber-based oscillator with a 150μJ regenerative amplifier and a relay-imaged four-pass diode-pump Nd glass amplifier to generate a 1 Hz top hat spatial beam and about 14 ps temporal Guassian pulse with<2%pulse-to-pulse energy stability.The output energy of the power amplifier is limited to 4 mJ for B-integral concern,and the frequency doubling efficiency can reach 65%with input intensity 10 GW/cm^(2).
文摘A special-velocity-matched electro-optic （EO） phase modulator employing a microwave resonant design in lithium niobate is presented. Both the microwave property and phase-modulation performances of the 3.25-GHz modulator agree well with the numerical simulations. Using this modulator in a single-pass configuration with 1-kW microwave drive power, the spectral bandwidth of a 1053-nm, 3-ns pulse-length laser is broadened to 0.13 nm. With a clear aperture of 5×5 （mm）, the modulator is suited for two- dimensional smoothing by spectral dispersion in high Dower laser systems.
基金supported by the National "863" Project of Chinathe National Natural Science Foundation of China(No.11204043)
文摘The experimental performance of beam smoothing by combined one-dimensional （1D） spectral dispersion and lens array （LA） technology is presented, as applied in the ninth beam of SG-II. Using 3w spectral dispersion with a bandwidth of 270 GHz and a line dispersion that is 24.9 times the beam＇s diffraction- limited width decreases the focal spot non-uniformity of 80% energy concentration from 46% to 17%. The multiple-beam interference properties of the LA are theoretically and experimentally validated by spatial power spectral density analysis. Peak-spectra suppression ratios of 20 and 10 dB are achieved in the dispersion and orthogonal directions, respectively.
文摘A 95 W Nd：YAG laser system pumped by a vertical cavity surface emitting laser（VCSEL） array is described.The laser contains an all-fiber-based seeder, an Nd：YAG regenerative amplifier, and a four-pass amplifier. The laser operates at 300 Hz with energies up to 317 m J. The beam has a top-hat intensity distribution. The temporal pulse shape is flat in time, and the pulse width can be adjusted in the range of 2–6 ns.
