Numerical and experimental results of wavefront aberration caused in a high power laser amplifier

Hong, Hailong; Liu, Q; Huang, Lei; Gong, Mali

doi:10.1088/1612-2011/10/2/025002

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…Although only some familiar aberrations and amplitude pupils are simulated here, we believe they can also be used widely in other conditions if the amplitude is non-uniform. Moreover, although some experiments have already been conducted [23,24], further experiments on wavefront corrections will follow in the near future. Generally speaking, a pure wavefront is difficult to measure with wavefront sensors because it is often mixed with the amplitude.…”

Section: Simulation Of the Optimized Amplitude-weighting Wavefront Co...mentioning

confidence: 99%

An optimized amplitude-weighting wavefront correction algorithm in laser systems

Xue¹,

Huang²,

Yan³

et al. 2013

Laser Phys.

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An optimized amplitude-weighting wavefront correction algorithm is proposed. Conventional correction algorithms do not optimize the Strehl ratio when the amplitude is non-uniform. The new algorithm yields an amplitude-weighted wavefront, aimed at reducing the variance of the weighted wavefront, instead of the variance of the wavefront as in conventional algorithms. The analytical equations explain how the weighted wavefront directly influences the Strehl ratio when the amplitude is non-uniform. The simulation results verify that the amplitude-weighting wavefront correction algorithm optimizes the Strehl ratio effectively in laser systems with Gaussian amplitudes. The new algorithm can improve the beam quality in laser systems compared with that attainable using conventional algorithms.

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Section: Simulation Of the Optimized Amplitude-weighting Wavefront Co...mentioning

confidence: 99%

An optimized amplitude-weighting wavefront correction algorithm in laser systems

Xue¹,

Huang²,

Yan³

et al. 2013

Laser Phys.

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“…The relatively low absorption coefficient of 1 µm laser for a disk-shaped gain medium is compensated by the intra-cavity pumping method [11] . Nevertheless, its poor pumping stability and strong nonlinear coupling can degrade the output laser performances significantly [13,14] . It is then difficult to study the operation characteristics of 1 µm pumped Tm:YAG disk laser in detail.…”

Section: Introductionmentioning

confidence: 99%

Up conversion and excited state absorption analysis in the Tm:YAG disk laser multi-pass pumped by 1 μm laser

Song

Zhu

Wang

et al. 2021

High Pow Laser Sci Eng

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We present a 2 μm Tm:YAG disk laser multi-pass pumped by a 1 μm laser. The transitions in competition of up conversion (UC) and excited state absorption (ESA) are analyzed in detail based on a numerical model that considers stimulated emission, fluorescence, non-radiative decay, UC, andESA, showing good agreement with experiments. The proportions and fractional thermal loads of all transitions are derived quantitatively. The results show that UC and ESA are critical in Tm:YAG disk lasers, resulting in a decrease in the absorbed pump power and temperature after lasing for two different disk thicknesses. In addition, although the absorbed pump power of the 0.5 mm disk is lower than in the 1 mm case, its relatively weak UC and ESA and low total fractional thermal load can improve laser performance. A 0.5 mm Tm:YAG disk laser thus delivered the maximum output power of1.05 W with beam quality of Mx2 = 2.02 and My2 = 2.03.

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“…After introduction of the beam quality parameter, Siegman analyzed the influence of spherical aberration on it in [10]. The effect of different Zernike aberrations on beam quality was studied in particular in [11][12][13][14]. We discuss here the applicability limitations of a polynomial aberration approach to beam quality characterization of self-phase modulated beams.…”

Section: Introductionmentioning

confidence: 99%

Quality deterioration of self-phase modulated Gaussian beams

2014

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The beam quality parameter M x 2 for self-phase modulated Gaussian and super-Gaussian beams has been calculated analytically. These results can be used for experimental measurements of nonlinearities in optical materials. A super-Gaussian beam with a size comparable to a Gaussian one demonstrates much more stable behavior with propagation through Kerr media. The deteriorated beam quality parameter has also been calculated analytically in the case of higher order localized radial phase modes. The presented analysis of beam quality degradation due to localized phase aberrations is more efficient than the standard one based on polynomial aperture aberrations.

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Numerical and experimental results of wavefront aberration caused in a high power laser amplifier

Cited by 7 publications

References 24 publications

An optimized amplitude-weighting wavefront correction algorithm in laser systems

An optimized amplitude-weighting wavefront correction algorithm in laser systems

Up conversion and excited state absorption analysis in the Tm:YAG disk laser multi-pass pumped by 1 μm laser

Quality deterioration of self-phase modulated Gaussian beams

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