Efficient thermal induced birefringence compensation in a QCW diode pumped Nd:YAG laser

Ebadian, H.; Maleki, Abbas

doi:10.1016/j.ijleo.2018.03.101

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…The results of the two processes were compared. Several methods have been reported to measure the thermal focal length in the end-pumped solid-state laser [16][17][18]. The focal length of the induced thermal lens can be calculated using the ABCD matrix approach of an optical resonator [19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal effect on the output characteristics of end-pumped Ho:YLF laser in concave–concave and concave–convex resonators

Tooski¹,

Maleki²,

Ebadian³

et al. 2023

Laser Phys.

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The thermal effect on the output characteristics was analyzed in an end-pumped Ho:YLF laser by applying the Kirchhoff integral analytic solution and finite element analysis using LASCAD software. At a Tm:fiber laser power of 70 W, the maximum temperature of a Ho:YLF crystal with 8 mm diameter was found to be 297.6 K. The temperature distribution results of the two calculation methods were matched with an acceptable error. The calculated thermal lens focal length for the maximum power was −985 and −976 mm in the 3 and 8 mm diameter rods, respectively. The simulation results showed that for the larger diameter crystal, the thermal lens effect is less. Moreover, in this study, the calculation results were validated as experimental results. A focal length of the thermal lens of −1012.6 ± 101.26 mm at double-pass pumping was measured. The experimental study showed that laser characteristics such as the far-field divergence angle were improved in the concave–convex resonator with 0.5% Ho:YLF crystal. The experimentally measured divergence angle was 0.7 mrad, which confirms the simulation results. The output power was 13.5 W, corresponding to 19.3% optical-to-optical efficiency.

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Section: Introductionmentioning

confidence: 99%

Investigation of thermal effect on the output characteristics of end-pumped Ho:YLF laser in concave–concave and concave–convex resonators

Tooski¹,

Maleki²,

Ebadian³

et al. 2023

Laser Phys.

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Long pulse millisecond pumped high-average-power linearly polarized single Nd:YAG rod laser

Lee

Yang

Wang

et al. 2019

Optics Communications

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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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Efficient thermal induced birefringence compensation in a QCW diode pumped Nd:YAG laser

Cited by 3 publications

References 17 publications

Investigation of thermal effect on the output characteristics of end-pumped Ho:YLF laser in concave–concave and concave–convex resonators

Investigation of thermal effect on the output characteristics of end-pumped Ho:YLF laser in concave–concave and concave–convex resonators

Long pulse millisecond pumped high-average-power linearly polarized single Nd:YAG rod laser

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

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