Pump pulse characteristics of quasi-continuous-wave diode-side-pumped Nd:YAG laser

Song, Ze-Xin; Bian, Qi; Shen, Yunfeng; Gong, Keling; Zong, Nan; Qi, Zong; Yang, Bo; Peng, Qinjun

doi:10.1088/1674-1056/ac447f

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…And the experimentally measured thermal focal length value is greater than 3 m. Combined with the measured thermal focal length value and theoretical analyses of laser cavity mode, it can be concluded that the marked ranges a and b correspond to the power-stable region and mode-stable region within LEDpumped CW solid-state laser's optimal working stability zone, while the marked mode-stable region c and power-stable region d within the traditional LD-pumped CW solid-state laser are optima work stability zone. [19][20][21][22][23][24][25]25] Due to the thermal accumulation from LED CW pumping, the temperature difference between the crystal's interior and thermal distortion gradually increase, resulting in a transition from range a to range b in the laser stable area. Moreover, the value of thermal focal length gradually becomes smaller, and the value of the fundamental mode spot radius ω 0 and mode volume also decreases accordingly.…”

Section: Resultsmentioning

confidence: 99%

Continuous wave and active Q-switched operation of Watt-level LED-pumped two-rod Nd,Ce:YAG laser

Shen 沈,

Lu 芦,

Xu 徐

et al. 2024

Chinese Phys. B

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In this paper, we demonstrated a high-performance LED-side-pumped two-rod Nd,Ce:YAG laser with continuous-wave (CW) and acousto-optical (A-O) Q-switched operation. A symmetrical shaped flat-flat cavity with two identical LED-side-pumped laser modules was employed for power scalability. In the CW regime, the maximum output average power of laser at 1064 nm was 4.41 W, corresponding to the highest optical conversion efficiency of 5.3% and a slope efficiency of 12.4%. In the active Q-switched regime, the pulse energy of laser was as high as 0.89 mJ at a repetition rate of 800 Hz with a pulse width of 457.2 ns, corresponding to the highest peak output power was 1.94 kW and the M2 factor was measured to be about 8.8. To the best of our knowledge, this is the first demonstration and the highest performance of an CW LED-side-pumped two-rod laser Nd,Ce:YAG with watt-level output reported so far.

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Section: Resultsmentioning

confidence: 99%

Continuous wave and active Q-switched operation of Watt-level LED-pumped two-rod Nd,Ce:YAG laser

Shen 沈,

Lu 芦,

Xu 徐

et al. 2024

Chinese Phys. B

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“…In this work, we analyze the emission mechanism of LEDs and address the coupling efficiency of LED-pumped lasers using non-diffuse scattering LEDs to rationalize the five-way pumping structure of LEDs. [16][17][18] To further enhance the intracavity photon number density, we adopt a high-efficiency LED-pumped two-rod Nd,Ce:YAG lasercavity structure. Under 80 W pump energy, a maximum average power of 11 W at 1319 nm is achieved at a repetition rate of 100 Hz in quasi-continuous wave (QCW) operation.…”

mentioning

confidence: 99%

An LED-Side-Pumped Intracavity Frequency-Doubled Nd,Ce:YAG Laser Producing a 2W Q-Switched Red Beam

Shen 沈,

Xu 徐,

LU 芦

et al. 2024

Chinese Phys. Lett.

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We reported a high average power acousto-optic (A-O) Q-switched intracavity frequency-doubled red laser based on a high efficiency LED-pumped two-rod Nd,Ce:YAG laser module. Under quasi-continuous wave (QCW) operation conditions, the maximum output power of 1319.08 nm wavelength was achieved at 11.26 W at a repetition rate of 100 Hz, corresponding to the maximum optical efficiency of 13.9 % and a slope efficiency of 17.9 %. In the active Q-switched regime, the pulse energy of laser was as high as 800 μJ at a repetition rate of 10 kHz with the pulse width of 1.5 μs. Under a non-critical phase-matched KTP crystal condition, an average power 2.03 W of 658.66 nm through intracavity frequency-doubling was obtained at a repetition frequency of 10 kHz with a duration of 1.3 μs and the M2 factor was measured to be about 5.8. To the best of our knowledge, this is the highest average power of LED-pumped A-O Q-switched 1319 nm laser and intracavity frequency doubled red laser reported to date.

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The Effect of Cooling Layer Thickness and Coolant Velocity on Crystal Thermodynamic Properties in a Laser Amplifier

et al. 2023

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Laser diode pumped solid-state lasers (DPSSLs) have been widely used in many fields, and their thermal effects have attracted more and more attention. The laser diode (LD) side-pumped amplifier, as a key component of DPSSLs, is necessary for effective heat dissipation. In this paper, instead of the common thermal analysis based only on a crystal rod model, a fluid–structure interaction model including a glass tube, cooling channel, coolant and crystal rod is established in numerical simulation using ANSYS FLUENT for the configuration of an LD array side-pumped laser amplifier. The relationships between cooling layer thickness, coolant velocity and maximum temperature, maximum equivalent stress, inlet pressure and the convective heat transfer coefficient are analyzed. The results show that the maximum temperature (or maximum equivalent stress) decreases with the increase in the coolant velocity; at low velocity, a larger cooling layer thickness with more coolant is not conductive enough for improved heat dissipation of the crystal rod; at high velocity, when the cooling layer thickness is above or below 1.5 mm, the influence of the cooling layer thickness on the maximum temperature can be ignored; and the effect of the cooling layer thickness on the maximum equivalent stress at high velocity is not very significant. The comprehensive influence of various factors should be fully considered in the design process, and this study provides an important reference for the design and optimization of a laser amplifier and DPSSL system.

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Pump pulse characteristics of quasi-continuous-wave diode-side-pumped Nd:YAG laser

Cited by 3 publications

References 21 publications

Continuous wave and active Q-switched operation of Watt-level LED-pumped two-rod Nd,Ce:YAG laser

Continuous wave and active Q-switched operation of Watt-level LED-pumped two-rod Nd,Ce:YAG laser

An LED-Side-Pumped Intracavity Frequency-Doubled Nd,Ce:YAG Laser Producing a 2W Q-Switched Red Beam

The Effect of Cooling Layer Thickness and Coolant Velocity on Crystal Thermodynamic Properties in a Laser Amplifier

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