Demonstration of high efficiency third harmonic conversion of high power Nd-glass laser radiation

The design, implementation, and measurements of a high efficiency and high power wideband GaN HEMT power amplifier are presented. Package parasitic effect is reduced significantly by a novel compensation circuit design to improve the accuracy of impedance matching. An improved structure is proposed based on the traditional Class-F structure with all even harmonics and the third harmonic effectively controlled, respectively. Also the stepped-impedance matching method is applied to the third harmonic control network, which has a positive effect on the expansion bandwidth. CGH40025F power transistor is utilized to build the power amplifier working at 0.8 to 2.7 GHz, with the measured saturated output power 20–50 W, drain efficiency 52%–76%, and gain level above 10 dB. The second and the third harmonic suppression levels are maintained at −16 to −36 dBc and −16 to −33 dBc, respectively. The simulation and the measurement results of the proposed power amplifier show good consistency.

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High efficiency third-harmonic generation of broadband Nd: glass laser

High Power Laser and Particle Beams ◽

10.3788/hplpb20112312.3400 ◽

2011 ◽

Vol 23 (12) ◽

pp. 3400-3404

Author(s):

陈英 Chen Ying ◽

钱列加 Qian Liejia ◽

傅喜泉 Fu Xiquan ◽

文双春 Wen Shuangchun ◽

周远 Zhou Yuan ◽

...

Keyword(s):

Harmonic Generation ◽

High Efficiency ◽

Third Harmonic Generation ◽

Glass Laser ◽

Third Harmonic

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Generation of nanosecond soft X-ray pulses as a result of interaction of the Nd: glass laser radiation with gas puff targets

Laser and Particle Beams ◽

10.1017/s0263034600008338 ◽

1994 ◽

Vol 12 (3) ◽

pp. 471-483 ◽

Cited By ~ 13

Author(s):

H. Fiedorowicz ◽

A. Bartnik ◽

Z. Patron ◽

P. Parys

Keyword(s):

Laser Radiation ◽

Vacuum Chamber ◽

High Efficiency ◽

X Rays ◽

Glass Laser ◽

Temperature Plasma ◽

X Ray ◽

Electromagnetic Valve ◽

Nanosecond Pulses ◽

Nd:Glass Laser

A new method of generation of nanosecond soft X-ray pulses with a photon energy around 1 keV is presented. X-rays are generated in a high-temperature plasma, which is created as a result of the interaction of Nd:glass laser radiation with a gas puff target. The target was obtained by puffing a small amount of gas through the nozzle into the vacuum chamber by means of a pressure electromagnetic valve. The pulses of laser radiation, with pulse duration of 1 ns and energy up to 15 J, generated in the system of a high-power Nd:glass laser were used for the target heating. Spatial, spectral, and temporal measurements of X-ray emission have shown that the high-intensity soft X rays are generated as a result of the interaction of nanosecond pulses of Nd:glass laser radiation with the gas puff target. A high efficiency of X-ray generation is suggested to be related to the effect of condensation of the gas outflowing from the valve nozzle and, in effect, to the interaction of laser radiation with matter in a form of aerosol.

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