Mitigation of Thermal Effects in End Pumping of Nd:YAG and Composite YAG/Nd:YAG Laser Crystals, Modelling and Experiments

Al-Hosiny, N.; El-Maaref, A.A.; El-Agmy, R. M.

doi:10.1134/s1063784221080028

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…The application of such active elements allows reducing the temperature gradient and increasing the gain coefficient. Such elements are made of crystals [11][12][13] or ceramics [14].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Yb:YAG Active Mirrors for High Power Laser Amplifiers

Petrov,

Kuptsov,

Kuptsova

et al. 2023

Photonics

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The work is aimed at the investigation of the influence of nonlinear active ions concentration profiles in Yb:YAG laser elements on temperature distribution and wavefront distortions during amplification using sub-kilowatt level diode pumping. A mathematical model is presented for the theoretical study of the amplification process in crystals with cubic crystal system. A detailed comparison of Yb:YAG active elements with the same thickness and absorbed pumping power, but with various concentration profiles of Yb3+, ions is carried out. It is shown that the use of active elements with an increasing dopant concentration in the pump beam direction allows one to optimize the temperature profile inside the active element and, thus, reduce the thermal-induced wavefront distortions of the amplified radiation. Modeling is carried out for the experimentally grown crystal with linear concentration gradient profile. It is shown that the linear doping profile with a gradient of 0.65 at.%/mm allows increasing the small-signal gain up to 10% and decreasing the thermal-induced wavefront distortions by ~15%.

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“…The application of such active elements allows reducing the temperature gradient and increasing the gain coefficient. Such elements are made of crystals [11][12][13] or ceramics [14].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Yb:YAG Active Mirrors for High Power Laser Amplifiers

Petrov,

Kuptsov,

Kuptsova

et al. 2023

Photonics

View full text Add to dashboard Cite

show abstract

“…Nd:YAG crystals have a high-efficiency four-level structure, but thermal effects limit the further improvement of the average power or energy of Nd:YAG lasers, and they also affect the stability and beam quality. The control of the stable region state of the resonator mainly lies in researching the thermal effect of laser crystals [17][18][19]. Sundar et al [20] reduced the thermal lens effect and improved the output beam quality factor by rotating the pump LDs angle.…”

Section: Introductionmentioning

confidence: 99%

High Repetition Frequency Solid-State Green Laser with Large Stable Area for Water Jet Guided

Wang,

Zhang

2023

Micromachines

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This paper presents the design and experimental results of a long cavity length Nd:YAG laser with a large stable zone for water jet-guided laser (WJGL) applications. The design is based on the light transmission matrix and resonator stability conditions, aiming to achieve a large stable zone and a short cut-off thermal focal length (CTFL). A folded concave resonator is researched to enhance the cavity length, and the influence of the tunable cavity arm length on the oscillating beam in the resonator and in the YAG crystal is theoretically studied. Moreover, the effects of the output mirror curvature and the cavity arm length on the range of the stable area and the cut-off thermal focal length are also investigated. Experimental results show that a stable green laser output is obtained after second harmonic generation (SHG) with a pulse width ranging from 43 to 143 ns within the laser operating frequency range of 5–20 kHz. At an operation frequency of 10 kHz, the output power is 21.33 W, and the instability of the output power within 400 min is 0.88%. The laser source achieves a maximum power of 25.7 W at 20 kHz, and the maximum single pulse energy reaches 2.7 mJ at 6 kHz. Finally, this is used as the laser source to couple with a water jet with a diameter of 100 microns, achieving a lossless water conductivity transmission over 60 mm length. These results demonstrate the suitability of the designed laser source for WJGL technology research. In precision machining applications, this technology exhibits processing advantages of low thermal damage (~2 μm) and large depth (>10 mm), for 7075 aluminum alloy.

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Multiple-beam output, high-peak power passively Q-switched Nd:YAG/Cr4+:YAG laser for ignition application - Modeling of laser pulse characteristics and thermal behavior

Grigore,

Pavel

2024

Results in Engineering

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Mitigation of Thermal Effects in End Pumping of Nd:YAG and Composite YAG/Nd:YAG Laser Crystals, Modelling and Experiments

Cited by 3 publications

References 17 publications

Enhanced Yb:YAG Active Mirrors for High Power Laser Amplifiers

Enhanced Yb:YAG Active Mirrors for High Power Laser Amplifiers

High Repetition Frequency Solid-State Green Laser with Large Stable Area for Water Jet Guided

Multiple-beam output, high-peak power passively Q-switched Nd:YAG/Cr4+:YAG laser for ignition application - Modeling of laser pulse characteristics and thermal behavior

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