ZnSe:Cr<sup>2+</sup> laser coherently pumped by Er:YAP 1.66 &#956;m laser or Tm: YAP 1.97 &#956;m laser

Maxim Doroshenko; Petr Koranda; Helena Jelínkova D.D.S.; Jan Šulc D.V.M.; Tasoltan T. Basiev D.D.S.; Vitaly K. Komar; Myron B. Kosmyna

doi:10.1117/12.684127

17 April 2006 ZnSe:Cr²⁺ laser coherently pumped by Er:YAP 1.66 μm laser or Tm: YAP 1.97 μm laser

Maxim Doroshenko, Petr Koranda, Helena Jelínkova D.D.S., Jan Šulc D.V.M., Tasoltan T. Basiev D.D.S., Vitaly K. Komar, Myron B. Kosmyna

Author Affiliations +

Proceedings Volume 6190, Solid State Lasers and Amplifiers II; 61901F (2006) https://doi.org/10.1117/12.684127
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

Tunable mid-infrared laser radiation sources are of interest for many applications in spectroscopy, ranging, remote-sensing, medical diagnosis and treatment and also for pumping nonlinear (OPO) and laser materials. The ZnSe:Cr²⁺ is a promising laser active material for lasing in the range of 2-3 μm. Up to now number of sources have been used for pumping ZnSe:Cr²⁺ active medium: Er-fibre laser, color-center laser, Co:MgF₂ laser, Tm lasers, and Raman-shifted Nd:YAG laser [1-4]. In our study we have demonstrated, characterized and compared ZnSe:Cr²⁺ laser coherently pumped either by flashlamp-pumped Er:YAP (wavelength 1.66 μm) or diode pumped Tm:YAP (wavelength 1.97 μm) laser radiations. For the case of ZnSe:Cr²⁺ laser pumping by wavelength 1.66 μm, the Er:YAP laser was constructed. From the measured output radiation characteristics followed that the maximal ZnSe:Cr ²⁺ laser output pulse energy was 5.5 mJ (slope efficiency 23%), and the length of pulse 120-160 μs. With the help of dispersive prism inside the resonator, the generated laser radiation was tunable from 2100 nm to 2450 nm with only 2 times drop in laser efficiency. The temporal profile and spatial structure of the generated laser beam were measured. Consequently, the diode-pumped Tm:YAP laser was constructed for coherently pumped ZnSe:Cr²⁺ laser. LIMO laser diode (40 W) was used for longitudinal pumping of Tm:YAP laser. The output characteristics and tuning curves were measured for various ZnSe:Cr²⁺ laser resonator arrangements and also for various pumping radiation conditions in pulsed regime (pulse duration, repetition rate, duty cycle). The maximal obtained ZnSe:Cr²⁺ laser output pulse energy was 0.35 mJ for the Tm:YAP pump pulse energy 13.5 mJ (pulse radiation 5 ms, repetition rate 20 Hz). The generated laser radiation was tunable from 2100 nm to 2450 nm. The temporal profile and spatial structure of the generated laser beam were measured.

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Maxim Doroshenko, Petr Koranda, Helena Jelínkova D.D.S., Jan Šulc D.V.M., Tasoltan T. Basiev D.D.S., Vitaly K. Komar, and Myron B. Kosmyna "ZnSe:Cr²⁺ laser coherently pumped by Er:YAP 1.66 μm laser or Tm: YAP 1.97 μm laser", Proc. SPIE 6190, Solid State Lasers and Amplifiers II, 61901F (17 April 2006); https://doi.org/10.1117/12.684127

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