18 November 2014 Theoretical analysis of wavelength switchable diode-side-pumped Tm:YAG laser
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Abstract
In the Tm3+ doped YAG crystal, the Tm3+ ions are excited into the 3H4 state from 3H6 state by absorbing pump radiation at ~ 785 nm, and the ions then relax down to the upper lasing level 3F4. The laser radiation takes place between the lower Stark level of 3F4 and the higher Stark level of 3H6. The considerable phonon broadening and high multiplicity of the Stark levels of the 4f electron provides tunability from 1.87 to 2.16 μm. We presented an analysis for the performance of side pumped quasi-three-level laser oscillators. Taking into account reabsorption loss, we present a theoretical model studies of quasi-three-level laser with particular attention given to the Tm:YAG laser. Equation for Tm:YAG quasi three-level laser system is founded, and a formula of the threshold pump power of the laser is described. The threshold pump power with different emission wavelengths versus the transmission of the output coupler is discussed, and we also analysis the influence on the threshold pump power with different emission wavelengths affected by the crystal length. With the same pump power, a lower transmission of the output coupler would result in a higher intracavity intensity. As a result, the lower laser sub-level within 3H6 ground state manifold has higher reabsorption loss and therefore, the higher Stark sub-level within 3H6 ground state manifold has a lower laser threshold and longer laser wavelength.
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Caili Wang, Caili Wang, Yanxiong Niu, Yanxiong Niu, Wenwen Liu, Wenwen Liu, Da Man, Da Man, } "Theoretical analysis of wavelength switchable diode-side-pumped Tm:YAG laser", Proc. SPIE 9266, High-Power Lasers and Applications VII, 92660S (18 November 2014); doi: 10.1117/12.2065232; https://doi.org/10.1117/12.2065232
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