Spatial filters for high-peak-power multistage laser amplifiers

Potemkin, A. K.; Barmashova, Tatiana; Kirsanov, A. V.; Martyanov, M.; Хазанов, Е. А.; Shaykin, A. A.

doi:10.1364/ao.46.004423

Cited by 24 publications

(13 citation statements)

References 24 publications

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“…By using the dependences obtained in the paper, we can easily predict this decrease. This undesirable effect can be obviously suppressed by producing beams with large élling factors [21]. Dt I at ln G 0 À0X20 À0X04 0 À0X16 À0X12 À0X08 Figure 8.…”

Section: Discussionmentioning

confidence: 99%

Linear dependence of the time shift of an amplified pulseon the energy extraction from a laser amplifier

Martyanov¹,

Лучинин²,

Potemkin³

et al. 2008

Quantum Electron.

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It is shown that the time shifts of the intensity maximum and B-integral for an ampliéed laser pulse are proportional to the energy extraction from the ampliéer normalised to the saturation energy, the proportionality coefécient being equal approximately to 1/7 and 1/14 of the pulse duration, respectively. Simple analytic expressions are obtained for the maximum values of the output intensity and B-integral. The results are experimentally conérmed by ampliécation observed in a Nd : YLF crystal.

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Section: Discussionmentioning

confidence: 99%

Linear dependence of the time shift of an amplified pulseon the energy extraction from a laser amplifier

Martyanov¹,

Лучинин²,

Potemkin³

et al. 2008

Quantum Electron.

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“…The loss of the SF was about 2%. The use of the SF will decrease the energy density of ASE noise down to negligibly small values (at least 4 orders of magnitude) [18,19].…”

Section: Methodsmentioning

confidence: 99%

82 kW high beam quality quasi-continuous-wave face-pumped Nd:YAG slab amplifier

Chen

Guo

et al. 2015

Appl. Opt.

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An 8 kW level quasi-continuous-wave (QCW) face-pumped 1064 nm slab laser with high beam quality was developed by a master oscillator power amplifier (MOPA) system. A single-mode fiber seed laser was amplified by two-stage single-pass Nd:YAG rod preamplifiers and four face-pumped Nd:YAG slab amplifiers. The slab amplifiers were well designed with uniform pumping and uniform cooling for well-distributed thermal and stress. A dynamically feedbacked optical aberration compensation device was employed to correct low-order optical aberration, and the residue high-order optical aberration was corrected by an adaptive optics system. The QCW MOPA delivered up to an average power of 8.2 kW with a pulse duration of 200 μs at a repetition rate of 400 Hz. The beam quality factor was measured to be β=3.5.

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“…Thus, at home and abroad, research on a high power laser spatial filter is mainly focused on how to design and optimize the physical and geometric parameters of the pinhole and lens pair, and avoid plasma closure near the focus with high flux density for effectively suppressing high-frequency noise. In high power laser systems, relevant research on spatial filters mainly includes two fields: the first is geometric designs of the confocal lens pair and pinhole diameter [3][4][5][6]; the second is optimization of materials and structures of pinholes which try to avoid the problem of plasma closure [7].…”

Section: Introductionmentioning

confidence: 99%

Evolution of low-frequency noise passing through a spatial filter in a high power laser system

Sun

Liu

Zhang

et al. 2011

Sci. China Phys. Mech. Astron.

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The theoretical model of spatial noise passing through a spatial filter is established in high power laser system under the small signal approximation. The transmission characteristic for a noise signal passing through spatial filters with different magnifications is analyzed by numerical simulation, according to the actual structure of the high power laser system. The results show that the spatial modulation period of low-frequency noise getting through the pinhole will be proportional to the magnification of the spatial filter. When the magnification is less than 1, the safe low-frequency noise will be extruded into the high-frequency region, which is the fast increasing part, and finally develops into the most dangerous part which can damage the optical devices. The conclusion of this research improves the relay imaging theory of a spatial filter and provides an important theoretical basis for a general design of high power laser systems.high power laser, spatial filter, spatial modulation frequency, modulation contrast ratio PACS: 42.65.Jx, 41.85.Ct, 42.30.Kq

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Spatial filters for high-peak-power multistage laser amplifiers

Cited by 24 publications

References 24 publications

Linear dependence of the time shift of an amplified pulseon the energy extraction from a laser amplifier

Linear dependence of the time shift of an amplified pulseon the energy extraction from a laser amplifier

82 kW high beam quality quasi-continuous-wave face-pumped Nd:YAG slab amplifier

Evolution of low-frequency noise passing through a spatial filter in a high power laser system

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