Solid-state lasers with self-pumped phase-conjugate mirrors in an active medium

The generation dynamics of a pulse-periodical Nd:YAG laser with a three-minor interferometer inside a loop cavity is investigated numerically. A parametrical back coupling is made by dynamics gratings in an active element inside the interferometer. An index mirror of the interferometer lets the intensity of colliding reference waves change and influence on the formation of holographic gain gratings, born in the process of four-wave mixing. The mathematical model is based on kinetic equations in the single mode and single frequency approximation in description of radiation propagation in the free space and in an active medium. Also the mathematical model includes the coupled waves equation in the description of four-wave mixing. The mathematical modeling has shown, that the investigated scheme allows to receive larger power output parameters of radiation in a regime of phase-conjugation in LiF:F2, in comparison with an ordinary loop scheme. The comparative analysis of generation dynamics in an offered scheme and in the loop scheme without any three-mirror interferometer showed the differentiation of mechanisms of dynamic gratings formation in Nd:YAG active mediums and defined conditions for optimal work of each schemes. The conditions for optimal work of each schemes were defined.

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“…1. We numerically studied the scheme, in which one phase-conjugated active medium places inside a three-minor interferometer.…”

Section: Resultsmentioning

confidence: 99%

<title>Generation dynamics of a self-starting self-pumped phase-conjugate Nd:YAG laser with a three-mirror interferometer inside the loop cavity</title>

2004

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“…Passive Q-switching of a self-pumped phase-conjugate Nd:YAG loop cavity at lamp pumping was realized for the first time in 4 and investigated in detail in 16 .…”

Section: Passive Q-switching By a F 2 -:Lif Crystalmentioning

confidence: 99%

“…1. The laser multiloop cavities had an open output without an output coupling mirror, but the self-pumped four-wave-mixing phase-conjugate mirror in the active Nd:YAG element provided positive feedback for laser oscillation [3][4][5] . The laser schemes didn't contain a non-reciprocal transmission element 5,7,10 , but in some experiments we used a F 2 -:LiF crystal for a passive Q-switch 3,4 .…”

Section: Cavity Schemesmentioning

confidence: 99%

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Passively Q-switched high-energy all-solid-state holographic Nd:YAG laser with a multiloop cavity

et al. 2015

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A high-energy, high-beam-quality laser based on a single Nd:YAG rod with laser diode side-pumping and multiloop self-adaptive reciprocal cavity is presented. The optimized laser cavity geometry allowed to change the laser oscillation from single 200-ns self-Q-switched pulse followed by low-intensity free-running lasing to repetitive high-intensive pulses by periodically writing and erasing holographic gain gratings in the active Nd:YAG medium. The intensified self-Q-switching pulse train oscillation was realized by the interaction with a diffusely reflecting target placed in the focal plane of a lens at the laser output. Effects of shortening of the repetitive laser pulses down to 70-ns duration, stabilization of the pulse repetition period (~ 5 µs), and mode-locking temporal modulation of the pulses were observed. The use of a passive F 2 -:LiF Q-switch resulted in stable giant pulse train oscillation with total output energy of up to 0.43 J, individual pulse energy of 50 mJ, and its peak power of 4 MW at the individual pulse duration of 12 ns.

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“…Recent interest in the lasers with four wave diffrac tion coupling in which the solid laser medium serves as both laser amplifier and element of optical coupling upon phase conjugation due to four wave interaction [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] has been driven by the progress in the technol ogy of multikilowatt LED pumping. The four wave interaction is based on the recording and reading of dynamic holograms (gain gratings in this work) that are recorded and erased upon development of laser generation and serve as a dynamic phase conjugate mirror.…”

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confidence: 99%

Generation regimes of a pulsed Nd:YAG laser with transverse LED pumping and multiloop self-pumped phase-conjugate cavity

et al. 2014

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The generation regimes in a pulsed Nd:YAG laser with transverse LED pumping and multiloop self pumped phase conjugate cavity on the gain gratings are studied. The differential efficiency of laser is 27% in the free running regime at a pulse energy of up to 1 J and quality parameter M 2 of no greater than 1.5. The pulse energy under passive Q switching is no less than 60% of the pulse energy in the free running regime at the same beam quality. The generation of the narrow band radiation is demonstrated. A generation band of no greater than 1.2 GHz corresponds to the primary single frequency high power laser pulse in the free running mode under conditions for self Q switching on the gain gratings. When additional elements ( :LiF and Cr 4+: YAG crystals) are introduced in the optical scheme of the phase conjugate cavity, similar narrow band single mode generation is observed in the passive Q switching regime as a pulse train or monopulse. The laser pulse power is up to 2 MW at a pulse duration of 20 ns.

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Solid-state lasers with self-pumped phase-conjugate mirrors in an active medium

Cited by 58 publications

References 3 publications

<title>Generation dynamics of a self-starting self-pumped phase-conjugate Nd:YAG laser with a three-mirror interferometer inside the loop cavity</title>

<title>Generation dynamics of a self-starting self-pumped phase-conjugate Nd:YAG laser with a three-mirror interferometer inside the loop cavity</title>

Passively Q-switched high-energy all-solid-state holographic Nd:YAG laser with a multiloop cavity

Generation regimes of a pulsed Nd:YAG laser with transverse LED pumping and multiloop self-pumped phase-conjugate cavity

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