Modeling of a solid-state laser module with pulse transverse diode pumping of Nd3+:YAG active medium

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In this work, a laser module (quantron) with transverse pulse diode pumping of a cylindrical Nd3+:YAG active element by the method of non-sequential ray tracing in the Zemax software environment is modeled. Numerically obtained distributions of the absorbed pump radiation power over the cross section of the active element and calculated the pumping efficiency of the quantron. A methodology for optimizing the quantron design is proposed, which results in an increase in the pumping efficiency of the active element.

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作者简介

S. Garnov

Prokhorov General Physics Institute of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: karina272001@yandex.ru

Corresponding Member of the RAS

俄罗斯联邦, Moscow

K. Galyuk

Prokhorov General Physics Institute of the Russian Academy of Sciences; National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: karina272001@yandex.ru
俄罗斯联邦, Moscow; Moscow

B. Ovcharenko

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: karina272001@yandex.ru
俄罗斯联邦, Moscow

A. Ushakov

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: karina272001@yandex.ru
俄罗斯联邦, Moscow

V. Bukin

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: karina272001@yandex.ru
俄罗斯联邦, Moscow

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2. Fig. 1. Optical scheme of the numerical experiment for measuring the spatial distribution of the intensity of the radiation spot of a diode array (Zemax).

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3. Fig. 2. Spatial distributions of the intensity of the radiation spot of the diode array, obtained in the numerical experiment (Zemax) (red graph) and calculated using the model function and the least squares method (blue graph); a – median horizontal section; b – median vertical section.

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4. Fig. 3. Optical diagram of the experimental setup for measuring the spatial distribution of the intensity of the radiation spot of a laser diode array.

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5. Fig. 4. Optical diagram of the cross-section of the quantron model with five-sided (a) and three-sided (b) diode pumping.

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6. Fig. 5. Absorption spectra of Nd3+:YAG 1% at. (blue graph), LDR emission with a central wavelength of 806 ± 3 nm (purple graph). Three Gaussian curves show the central position of the LDR emission spectrum (solid line) and the limiting cases of shift in the position of the LDR emission spectrum within a batch at a fixed temperature of 25 °C (dashed curves).

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7. Fig. 6. Absorption length in Nd3+:YAG 1% at. in the range of LDR emission wavelengths within a batch.

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8. Fig. 7. Distribution of the absorbed radiation power over the cross section of Nd3+:YAG in the Zemax mathematical model with five-sided (a) and three-sided (b) pumping.

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9. Fig. 8. Spatial distribution of the absorbed radiation power in the middle horizontal section of the cross-section of the active element with five-sided (red graph) and three-sided (blue graph) pumping.

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10. Fig. 9. Values ​​of the pumping efficiency of the active element for different values ​​of Δ – the thickness of the liquid flow and quartz tube (a); H – the distance between the laser diode arrays (b).

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11. Fig. 10. Optical diagram of the cross-section of a model of a quantron with metal reflectors, a – located at a certain distance from the outer surface of the quartz tube, b – deposited on the outer surface of the quartz tube.

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12. Fig. 11. Values ​​of the pumping efficiency of the active element for different values ​​of the radius R of the metal reflector (a), the arc angle φ of the segment of the metal deposition on the quartz tube (b).

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13. Fig. 12. Values ​​of the pumping efficiency of the active element with an acceptable error in the installation of the active element and the quartz tube: (a) ∆y is the displacement of the elements along the y axis; (b) γ is the angle of rotation relative to the center of the active element around the y axis.

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