For compact and lightweight LASERs, producing stable output laser beams in adverse environments,such as high-vibration and high-temperature shock is a global problem. A solid-state high-power pulsed LASER is developed in this study. This LASER adopts tightly set six-channel LD pumped configuration and a single-aperture output scheme employs mutual-injection and confinement technic. By applying the method "confining oscillation and amplification", LASER parameters are: 100 mm × 100 mm × 300 mm in block dimension, 1.06μm in wavelength, 10Hz, 9.66J/pulse@0.5ms, beam quality 5mm × 2mrad, energy instability < 2%, and another beam: 3.1J/pulse@8.39ns, beam quality 5 mm × 2.5 mrad. The LASER is compact, lightweight, highly reliable, and with high pulse energy and excellent beam quality, thus allowing long-pulse and short-pulse operations. The developed approach can be potentially used for future applications.
A pair of special diffractive optical element (DOE) is used in the combining of six Nd:YAG lasers to obtain flat-top output beam. The function of this pair of DOE in the system has been discussed. The property of output beam distribution has been analyzed and simulated. Both the measured far field and near field intensity distributions match the simulated results. Combining output energy of 15.3J is obtained, and the transfer efficiency of the DOEs is about 81%.
The mechanism and characteristics of evanescent-wave coupling in solid-state laser is analyzed theoretically and experimentally. The results shown that self-organized phase locking between laser modes can be realized by evanescentwave coupling in solid-state laser. Based on “mutual injection and evanescent wave” characteristics of corner-cube prism, the paper reveals that far-field output of corner-cube laser is the inner reason and mechanism of coherent combining distribution by theory of evanescent wave and its coherence is better than plane parallel resonator. And “mutually coupled phase locking of six lasers based cube-corner resonator” scheme is proposed on this basis.
An efficient single-pass pumped extracavity singly-resonant optical parametric oscillator at 1.57μm eye-safe range using
a non-critically phase-matched KTP crystal is reported. The pump source is a diode pumped Gaussian unstable resonator
Nd:YAG laser with the high beam quality of M2=1.8. The signal energy of 65mJ with the pulse width of 9ns is obtained
under the input pump pulse of 196mJ 12ns. This result provided a clear demonstration that very high pump-to-signal
energy conversion (up to 33.2%) can be achieved from an extracavity OPO even by single-pass pumped method. The
repetition rate range of the all-solid-state OPO device is 30Hz.
A high efficient ring-cavity optical parametric oscillator at 1.57μm eye-safe range using three non-critically phasematched
KTP crystals is researched and experimentally demonstrated. The primary advantage of the ring-cavity OPO is
that the resonator mirrors are at 30 degrees to the pump beam, so they do not provide any feedback to the pump laser.
The signal energy of 75mJ with the pulse width of 6.6ns is obtained under the input pump pulse of 200mJ. This result
provided a clear demonstration that high pump-to-signal energy conversion (up to 37.5%) can be achieved from the ringcavity
OPO by single-pass pumped method.
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