Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier

Victor Hariton; Celso Paiva Jo?o; Hugo Pires; Mario Galletti; Gon?alo Figueira

doi:doi:10.1017/hpl.2020.11

High Power Laser Science and Engineering, 2020, 8 (2): 02000e13, Published Online: Apr. 21, 2020

Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier Download： 637次

Victor Hariton ^1,*Celso Paiva Jo?o ¹Hugo Pires ¹Mario Galletti ²Gon?alo Figueira ¹

Author Affiliations

¹ GoLP/Instituto de Plasmas e Fus?o Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais,1049-001Lisbon, Portugal

² GoLP/Instituto de Plasmas e Fus?o Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais,1049-001Lisbon, Portugal

Figures & Tables

Fig. 1. Measured pump profile at the crystal medium plane ($z=l/2$) for a pump power of 4 kW, 1 ms.

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Fig. 2. Temporal evolution of the input face axial temperature ($r=0$; $z=0$) of a repetitively pumped Yb:YAG crystal. The 1 Hz regime shows a negligible temperature buildup, while for 5 Hz and 10 Hz regimes there is a clear overall temperature offset.

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Fig. 3. Temporal evolution of the $z=0$ radial temperature distribution for a 1 Hz repetition rate pump. The time window ranges from 0 to 10 s, when the maximum temperature is reached. Color scale in kelvin. A maximum pump power was assumed (4 kW, 1 ms) delivered in a $w_{p}=1.35~\text{mm}$ waist radius, resulting in a temperature difference of 13.6 K between the edge and the center of the gain medium.

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Fig. 4. Temporal evolution of the $z=0$ radial temperature distribution at 10 Hz, 1 ms pump pulse. Color scale in kelvin. (a) Time window corresponding to initial evolution (0–1 s), showing a net increase in the peak temperature. (b) Steady state at nearly constant temperature, with periodic fluctuations. Maximum temperature difference between the center and the coolant is 39.4 K.

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Fig. 5. Optical path difference versus radial position inside gain medium for 1 Hz and 10 Hz. Quadratic behavior valid for the pumping region ($r). Significant differences shown for the outer region ($w_{p}).

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Fig. 6. Experimental setup for thermal lens measurement.

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Fig. 7. Performance of the 8-pass amplifier. A maximum output energy of 100 mJ is achieved on a daily basis. The inset shows corresponding spectra for the main stages of the laser setup.

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Fig. 8. Wavefront measurements for the probe beam in units of $\unicode[STIX]{x1D706}$. (a) Input beam. (b) Residual wavefront after removal of the reference wavefront. (c) Example of a measured wavefront.

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Fig. 9. Experimental thermal lens focal length versus pump power for 1 ms, 1 Hz (in red). Each data point represents the mean value of 10 consecutive measurements. The results of the numerical model are shown in black.

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Table1. Thermo-optical properties of Yb:YAG.

Material	()	()	()	Doping (at.%)	(nm)	(nm)	()
Yb:YAG	8.4	590	4.560	3	940	1030	3	0.14

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Victor Hariton, Celso Paiva Jo?o, Hugo Pires, Mario Galletti, Gon?alo Figueira. Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier[J]. High Power Laser Science and Engineering, 2020, 8(2): 02000e13.

Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier Download： 637次

Fig. 1. Measured pump profile at the crystal medium plane ($z=l/2$) for a pump power of 4 kW, 1 ms.

Fig. 2. Temporal evolution of the input face axial temperature ($r=0$; $z=0$) of a repetitively pumped Yb:YAG crystal. The 1 Hz regime shows a negligible temperature buildup, while for 5 Hz and 10 Hz regimes there is a clear overall temperature offset.

Fig. 5. Optical path difference versus radial position inside gain medium for 1 Hz and 10 Hz. Quadratic behavior valid for the pumping region ($r). Significant differences shown for the outer region ($w_{p}).

Fig. 6. Experimental setup for thermal lens measurement.

Fig. 7. Performance of the 8-pass amplifier. A maximum output energy of 100 mJ is achieved on a daily basis. The inset shows corresponding spectra for the main stages of the laser setup.

Fig. 8. Wavefront measurements for the probe beam in units of $\unicode[STIX]{x1D706}$. (a) Input beam. (b) Residual wavefront after removal of the reference wavefront. (c) Example of a measured wavefront.

Fig. 9. Experimental thermal lens focal length versus pump power for 1 ms, 1 Hz (in red). Each data point represents the mean value of 10 consecutive measurements. The results of the numerical model are shown in black.

Table1. Thermo-optical properties of Yb:YAG.

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Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier Download： 637次

Fig. 1. Measured pump profile at the crystal medium plane ($z=l/2$) for a pump power of 4 kW, 1 ms.

Fig. 2. Temporal evolution of the input face axial temperature ($r=0$; $z=0$) of a repetitively pumped Yb:YAG crystal. The 1 Hz regime shows a negligible temperature buildup, while for 5 Hz and 10 Hz regimes there is a clear overall temperature offset.

Fig. 5. Optical path difference versus radial position inside gain medium for 1 Hz and 10 Hz. Quadratic behavior valid for the pumping region ($r). Significant differences shown for the outer region ($w_{p}).

Fig. 6. Experimental setup for thermal lens measurement.

Fig. 7. Performance of the 8-pass amplifier. A maximum output energy of 100 mJ is achieved on a daily basis. The inset shows corresponding spectra for the main stages of the laser setup.

Fig. 8. Wavefront measurements for the probe beam in units of $\unicode[STIX]{x1D706}$. (a) Input beam. (b) Residual wavefront after removal of the reference wavefront. (c) Example of a measured wavefront.

Fig. 9. Experimental thermal lens focal length versus pump power for 1 ms, 1 Hz (in red). Each data point represents the mean value of 10 consecutive measurements. The results of the numerical model are shown in black.

Table1. Thermo-optical properties of Yb:YAG.

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