Simulations of the gain profile and performance of a diode side-pumped QCW Nd:YAG laser

Lera, Roberto; Valle-Brozas, Francisco; Torres-Peiró, Salvador; Ruiz-de-la-Cruz, Alexandro; Galán, Miguel Á.; Bellido, P.; Seimetz, M.; Benlloch, J.; Roso, L.

doi:10.1364/ao.55.009573

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…( 21) only provides a rough necessary condition for azimuthal uniformity to be achieved; in other words, rather inhomogeneous pumping patterns can be actually obtained if other parameters not appearing in the equation, such as, for instance, the focusing length of each bar, are not optimized. As expected, approaching the limit of 𝑟 → 1 (that is, the diode bars getting closer to the doped region), the total number of diodes 𝑁 𝑠 𝑁 𝑏 and their slow axis divergence angle 𝜑 0 must be appropriately increased to match the condition (21). Eq.…”

Section: Spatial Distribution Of the Absorbed Pump Energymentioning

confidence: 83%

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A model for pumping optimization in edge-pumped disk amplifiers

Palla

Labate

Baffigi

et al. 2022

Optics & Laser Technology

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Section: Spatial Distribution Of the Absorbed Pump Energymentioning

confidence: 83%

“…Edge-pumping has also been considered for rod amplifiers, aiming at pursuing a high repetition rate in Nd-based, nanosecond pump laser systems. For instance, in [21] a configuration involving the usage of six diode bars to pump a Nd:YAG rod was numerically modeled using a ray-tracing method.…”

Section: Introductionmentioning

confidence: 99%

A model for pumping optimization in edge-pumped disk amplifiers

Palla

Labate

Baffigi

et al. 2022

Optics & Laser Technology

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“…Its CPA scheme comprises a regenerative amplifier and two multipass amplification stages. The water-cooled diode pumping modules (Nd:YAG) run up to 100 Hz pulse rate [5]. By now, a maximum energy of 300 mJ in pulses of 55 fs duration (FWHM) has been obtained.…”

Section: Methodsmentioning

confidence: 99%

Proton acceleration with a table-top TW laser

Seimetz

Bellido

Lera³

et al. 2016

J. Inst.

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A: We report on the recent demonstration of proton acceleration from a purpose-made Ti:Sapphire laser system. In the first successful series of autumn 2015, running at 2 TW peak power and 100 Hz diode pump rate, protons up to 0.7 MeV have been spectrally characterised. Subsequently, at increased laser pulse energy and improved contrast, we have obtained maximum particle energies around 1.7 MeV. These results, achieved in single-shot mode with a variety of thin foil targets, are an important step towards our aim of a stable, compact proton accelerator with high rate capacity.

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“…但Yb:YAG晶体阈值高、增益小、自吸收效应严重, 为保证泵浦光被薄片介质完全吸收, 通常需要采用非常复杂的多通耦合结构或键合结构来增加泵浦吸收路径 [13] . 本文采用Nd:YAG薄片作为激光增益介质, 通过侧面折返泵浦的方式降低泵浦耦合结构的系统复杂度 [14] .…”

Section: 光束质量unclassified

Laser-diode-array side-zigzag-pumped polygon thin-disk laser

Chen¹,

Qiu²,

Zhang³

et al. 2021

Acta Phys. Sin.

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The high-average-power diode-pumped solid-state laser is one of the main research directions in the field of international laser technology, and has major applications in the fields like space exploration, precise detection, fusion research, etc. Under high-power pumping conditions, the conventional rods or slabs are not conducive to effectively removing waste heat. And the thermal effect causes the quality of the laser beam to deteriorate, which limits the further increase of the output power. In this article, the polygonal Nd: YAG thin disk is taken as a gain medium for the laser, and experiments verify that the side pumping method can obtain a higher output power of the all-solid-state pulsed laser while ensuring high beam quality. The gain medium is a regular pentagonal Nd: YAG thin disk with a side-cut-angle of 45°, the crystal thickness is 1.5 mm, and the diameter of the inscribed circle on the front face is 16 mm. Five laser diode arrays are placed symmetrically around the disk, and the pump surfaces are parallel to the sides of the disk. The pump laser propagates along the zigzag path between the upper and lower surface of the disk, thus improving the absorptive efficiency and pump uniformity. Through the optimization study of its gain characteristics and optical characteristics, the high-efficiency high-uniform pumping is achieved. Along the pump light coupling transmission path, the fast-axis collimator is used to control the beams in the fast-axis direction to be nearly parallel, and the large-area pump light is compressed through the coupling structure of cylindrical lens and light guide to match the size of the thin disk, and the pump coupling efficiency measured experimentally is 97%. When the Nd<sup>3+</sup> doping concentration in the crystal is 0.3 at.%, the gain medium absorptive efficiency is 87%, and the root mea squared pump absorptive distribution uniformity in the gain medium is 3.21%. The fluorescence distribution of the gain medium is in good agreement with the simulated data. When the pump energy is 2.2 J, a laser output with an energy of 0.85 J is obtained, and optical-to-optical efficiency and slope efficiency are 38.8% and 40.1%, respectively. The single pulse energy stability is 2.7%(RMS) at 1 Hz frequency. In the stable cavity, the beam quality <i>β</i> - factor is measured to be about 10.

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Simulations of the gain profile and performance of a diode side-pumped QCW Nd:YAG laser

Cited by 6 publications

References 6 publications

A model for pumping optimization in edge-pumped disk amplifiers

A model for pumping optimization in edge-pumped disk amplifiers

Proton acceleration with a table-top TW laser

Laser-diode-array side-zigzag-pumped polygon thin-disk laser

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