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Proceedings Paper

LD dual-end-pumped CW Tm:YLF laser
Author(s): Xin-yu Chen; Yu Zhang; Yong-ji Yu; Chao Wang; Guang-yong Jin
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Paper Abstract

We report on a LD dual-end-pumped 792nm continuous wave operation Tm:YLF laser. Firstly, the rate equation of LD end-pumped CW operation Tm:YLF laser were established, in which the energy transfer upconversion and without energy transfer upconversion under continuous-wave considerate were considered, as well the pump threshold and the slope efficiency of the laser system were analyzed. Simultaneously, the cavity stability condition and the pattern matching of the plano- concave resonator were analyzed according to ABCD Matrix theory. Comparing respectively the laser threshold and the slope efficiency and optical-optical conversion efficiency under circumstances which the output mirror transmittance of 15% and 23%. In addition, the M2 of the output laser were contrasted and analyzed in adjusting the resonator cavity length by using different radius of curvature of the output mirror in 150mm, 200mm and 300mm all in the above case. As the process of thermal lens focal length changing greater than 90mm, it exhibited that the two fundamental modes in the cavity resonator matched well in numerical simulation when the radius of curvature of the output mirror was 300mm, as well the two fundamental modes matched well when it more than 100mm in a certain pump power. We designed a single LD dual-end-pumped continuous wave operation Tm:YLF laser. Using Tm:YLF (3 at.%) crystal for gain medium, which the size was 3×3×14mm3. In experiments, the Tm:YLF laser crystal keeps 291K and the temperature control method is water cooling. The length of the resonator was 135mm when L shape plano-concave resonator was applied, and the radius of curvature output mirror was 300mm, as well as the temperature of the Tm:YLF laser crystal was 291K. The output laser we observed by this system and the central laser wavelength was 1944nm. The threshold power was 8.11W and the highest output power reaches to 4.01W when the totally input pump power was 17W, and the optical conversion efficiency was 23.6%. The far-field divergence angle was 3.8mrad after calculation. Respectively. The experimental results are coinciding with the theory.

Paper Details

Date Published: 17 September 2013
PDF: 10 pages
Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 890417 (17 September 2013); doi: 10.1117/12.2034533
Show Author Affiliations
Xin-yu Chen, Changchun Univ. of Science and Technology (China)
Yu Zhang, Changchun Univ. of Science and Technology (China)
Yong-ji Yu, Changchun Univ. of Science and Technology (China)
Chao Wang, Changchun Univ. of Science and Technology (China)
Guang-yong Jin, Changchun Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 8904:
International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications
Andreas Tünnermann; Zejin Liu; Pu Wang; Chun Tang, Editor(s)

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