Analysis of wavefront aberration induced by turbulent flow field in liquid-convection-cooled disk laser

Li, Peilin; Fu, Xing; Liu, Qiang; Gong, Mali

doi:10.1364/josab.30.002161

Cited by 23 publications

(6 citation statements)

References 20 publications

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“…Also, we verified that the wavefront distortion due to the modulation of refractive index by micro-scale eddies, can be well described by the Zernike polynomial of a few certain orders [12]. In addition, using the large-eddy-simulation model, wavefront aberration induced by turbulent flow field in liquid-convection-cooled solid-state laser was investigated [13], which well demonstrated the structure of time-random turbulent eddies and the effects of turbulent eddies on wavefront aberration.…”

Section: Introductionmentioning

confidence: 57%

3kW liquid–cooled elastically-supported Nd:YAG multi-slab CW laser resonator

Fu¹,

Li²,

Liu³

et al. 2014

Opt. Express

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A 3kW liquid-convection-cooled Nd:YAG CW laser resonator with a novel design is developed and demonstrated, in which the straight-through geometry is adopted that the oscillating laser propagates through multiple thin slabs and multiple cooling flow layers in Brewster angle. Using the elastically-supported Nd:YAG single-crystal thin slabs at different doping levels, a multimode laser output with the output power of 3006 W is obtained from the stable cavity at the pump power of 19960 W, corresponding to an optical-optical efficiency of 15.1%, and a slope efficiency of 21.2%.

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Section: Introductionmentioning

confidence: 57%

3kW liquid–cooled elastically-supported Nd:YAG multi-slab CW laser resonator

Fu¹,

Li²,

Liu³

et al. 2014

Opt. Express

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“…Since the thermo-optical coefficient of liquid reaches up to a level of −10 −4 ∕ K (10 −6 ∕ K in solid), the refractive index field in flowing coolant liquid is inhomogeneous. As a result, propagation of laser beams through a flowing coolant liquid brings the challenge that light will be deflected and refracted [6][7][8]. When it comes to this laser configuration, there are two core questions attracting people's attention.…”

Section: Introductionmentioning

confidence: 99%

Resonance spiking by periodic loss in the double-sided liquid cooling disk oscillator

Nie

She

et al. 2017

Laser Phys.

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A double-sided liquid cooling Nd:YAG disk oscillator working at a pump repetition rate of 20 Hz is demonstrated. The output energy of 376 mJ is realized, corresponding to the opticaloptical efficiency of 12.8% and the slope efficiency of 14%. The pump pulse width is 300 µs and the laser pulse width is 260 µs. Instead of being a damped signal, the output of laser comprises undamped spikes. A periodic intra-cavity loss was found by numerical analysis, which has a frequency component near the eigen frequency of the relaxation oscillation. Resonance effect will induce amplified spikes even though the loss fluctuates in a small range. The Shark-Hartmann sensor was used to investigate the wavefront aberration induced by turbulent flow and temperature gradient. According to the wavefront and fluid mechanics analysis, it is considered that the periodic intra-cavity loss can be attributed to turbulent flow and temperature gradient.

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“…With the direct-liquid-cooled configuration, the linear arrangement of multiple thin disks is can be realized since the oscillating laser passes through dozens of thin disks transmissively [3,4], while a high pump intensity is allowed due to its efficient thermal management [5]. Furthermore, a flexible support is easy to realize and the awful wavefront aberration existing in the conventional thin disks that are welded on coolers can be avoided [6][7][8]. The study of direct-liquid-cooled multi-disk SSL has attracted much attention [9,10].…”

Section: Introductionmentioning

confidence: 99%

7kW direct-liquid-cooled side-pumped Nd:YAG multi-disk laser resonator

et al. 2016

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A direct-liquid-cooled side-pumped Nd:YAG multi-disk QCW laser resonator is presented, in which the oscillating laser propagates through multiple thin disks and cooling flow layers in Brewster angle. Twenty Nd:YAG thin disks side-pumped by LD arrays are directly cooled by flowing deuteroxide at the end surfaces. A laser output with the highest pulse energy of 17.04 J is obtained at the pulse width of 250 μs and repetition rate of 25 Hz, corresponding to an optical-optical efficiency of 34.1% and a slope efficiency of 44.5%. The maximum average output power of 7.48 kW is achieved at the repetition rate of 500 Hz. Due to thermal effects, the corresponding optical-optical efficiency decreases to 30%. Under the 12.5 kW pumping condition while not oscillating, the wavefront of a He-Ne probe passing through the gain module is as low as 0.256 μm (RMS) with the defocus and tetrafoil subtracted.

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Analysis of wavefront aberration induced by turbulent flow field in liquid-convection-cooled disk laser

Cited by 23 publications

References 20 publications

3kW liquid–cooled elastically-supported Nd:YAG multi-slab CW laser resonator

3kW liquid–cooled elastically-supported Nd:YAG multi-slab CW laser resonator

Resonance spiking by periodic loss in the double-sided liquid cooling disk oscillator

7kW direct-liquid-cooled side-pumped Nd:YAG multi-disk laser resonator

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