Analysis on the thermal effect of Pr:YLF crystal for power scaling

Qi, Yaoyao; Zhang, Yu; Huo, Xiaowei; Wang, Jingjing; Bai, Zhenxu; Ding, Jie; Li, Sensen; Wang, Yulei; Lü, Zhiwei

doi:10.1117/1.oe.61.4.046108

Cited by 4 publications

(3 citation statements)

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“…According to Ref. 17, we can obtain the expression of the thermal focal length for Pr:YLF as Eq. (9), and the result of the simulation is shown in Fig.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…The finite-element analysis method was adopted in the whole analysis. 16,17 To achieve optimization of power scaling further, the OEF as a function of the waist position and size of pump beams should be deeply investigated by including the thermal effect into the spatial rate equation analysis. So far, most of the research for mode matching degree is mainly focused on the Nd 3+ -doped crystal.…”

Section: Introductionmentioning

confidence: 99%

“…Our previous work simulated the distribution of temperature, thermal stress, thermal focal length, and thermal load for Pr:YLF crystal with different doping concentrations. The finite-element analysis method was adopted in the whole analysis 16 , 17 . To achieve optimization of power scaling further, the OEF as a function of the waist position and size of pump beams should be deeply investigated by including the thermal effect into the spatial rate equation analysis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of the overlap efficiency factor for power scaling in visible Pr:YLF laser at 607 nm pumped by fiber-coupled GaN laser diodes

Guo

Bai

et al. 2023

Opt. Eng.

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The power scaling of an all-solid-state visible laser is limited by the mode-to-pump ratio related to the thermal effect based on the spatial rate equation. The mode-to-pump ratio is also known as the overlap efficiency factor (OEF). We investigated the thermal effect as a function of pump power, the waist radius of pump beams, and the waist position of pump beams and have simulated the three-dimensional distribution of the OEF as a variable of the waist position and size of pump beams. Also, it is seen that the calculated optimal OEF under a plane-concave cavity is a decreasing function of input pump power, and it is less than unity in the case of high pump power. The practical example of a Pr:YLF laser pumped by 9-W fiber-coupled laser diodes confirms our theoretical analysis. The output power instability was < AE1:625% (RMS) within 1 h. In addition, by changing the cavity length to 38 mm, the output power of 607 nm is up to 103 mW with an OEF of 0.741.

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“…According to Ref. 17, we can obtain the expression of the thermal focal length for Pr:YLF as Eq. (9), and the result of the simulation is shown in Fig.…”

Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of the overlap efficiency factor for power scaling in visible Pr:YLF laser at 607 nm pumped by fiber-coupled GaN laser diodes

Guo

Bai

et al. 2023

Opt. Eng.

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7.56-W continuous-wave Pr³⁺-based green laser via managing thermally induced effects

Zhang,

Wang,

Lian

et al. 2023

Opt. Express

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Blue-laser-diode-pumped Pr3+-based continuous-wave (CW) green lasers have aroused growing research interest in developing optoelectronic applications and deep ultraviolet laser sources due to their simple and compact structural design. However, the obstacle of thermally induced effects limits the available output power of Pr3+-based green lasers. Herein, combined with the theoretical analysis and experimental feedback, we effectively adjust the heat distribution inside the Pr3+:LiYF4 gain crystal by optimizing the crystal dimension and doping concentration. The excellent mode matching between the pump and green lasers is achieved under the consideration of thermally induced effects, yielding a maximum CW output power of 7.56 W. To the best of our knowledge, this is the largest output power of Pr3+-based CW green lasers so far. Moreover, the obtained green laser demonstrates excellent output stability (RMS = 1.27%) and beam quality (M2 = 1.30 × 1.12) under the lasing operation state with the maximum output power. We hope that this study can provide a feasible paradigm for developing blue-laser-diode-pumped visible lasers, especially for high-power lasers.

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Analysis of Thermal Effects in Kilowatt High Power Diamond Raman Lasers

et al. 2022

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Chemical vapor deposition (CVD) diamond crystal is considered as an ideal material platform for Raman lasers with both high power and good beam quality due to its excellent Raman and thermal characteristics. With the continuous development of CVD diamond crystal growth technology, diamond Raman lasers (DRLs) have shown significant advantages in achieving wavelength expansion with both high beam quality and high-power operation. However, with the output power of DRLs reaching the kilowatt level, the adverse effect of the thermal impact on the beam quality is progressively worsening. Aiming to enunciate the underlying restrictions of the thermal effects for high-power DRLs (e.g., recently reported 1.2 kW), we here establish a thermal-structural coupling model, based on which the influence of the pump power, cavity structure, and crystal size have been systematically studied. The results show that a symmetrical concentric cavity has less thermal impact on the device than an asymmetrical concentric cavity. Under the ideal heat dissipation condition, the highest temperature rise in the diamond crystal is 23.4 K for an output power of ~2.8 kW. The transient simulation further shows that the heating and cooling process of DRLs is almost unaffected by the pump power, and the times to reach a steady state are only 1.5 ms and 2.5 ms, respectively. In addition, it is also found that increasing the curvature radius of the cavity mirror, the length and width of the crystal, or decreasing the thickness of the crystal is beneficial to alleviating the thermal impact of the device. The findings of this work provide some helpful insights into the design of the cavity structure and heat dissipation system of DRLs, which might facilitate their future development towards a higher power.

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Analysis on the thermal effect of Pr:YLF crystal for power scaling

Cited by 4 publications

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Optimization of the overlap efficiency factor for power scaling in visible Pr:YLF laser at 607 nm pumped by fiber-coupled GaN laser diodes

Optimization of the overlap efficiency factor for power scaling in visible Pr:YLF laser at 607 nm pumped by fiber-coupled GaN laser diodes

7.56-W continuous-wave Pr³⁺-based green laser via managing thermally induced effects

Analysis of Thermal Effects in Kilowatt High Power Diamond Raman Lasers

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Analysis on the thermal effect of Pr:YLF crystal for power scaling

Cited by 4 publications

References 0 publications

Optimization of the overlap efficiency factor for power scaling in visible Pr:YLF laser at 607 nm pumped by fiber-coupled GaN laser diodes

Optimization of the overlap efficiency factor for power scaling in visible Pr:YLF laser at 607 nm pumped by fiber-coupled GaN laser diodes

7.56-W continuous-wave Pr3+-based green laser via managing thermally induced effects

Analysis of Thermal Effects in Kilowatt High Power Diamond Raman Lasers

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Product

Resources

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7.56-W continuous-wave Pr³⁺-based green laser via managing thermally induced effects