LD-pumped Ho,Tm:YLF microchip laser

Abstract

A simple rate equation model for 2µm Tm,Ho:YLF laser is given to study laser dynamics. Under low pump power, the explicit formulae for the threshold pump power and the relation between output power and incident power are obtained. The present model provides a straightforward procedure to design the laser resonator and the optical coupling system for optimization. At the same time, the experimental results are reported. At room temperature the slope efficiency is 22.4% and the typical lasing threshold is about 328mW. The theory is in good agreement with experiment.

Keywords

Tm,Ho:YLF / room temperature / laser diode / rate equation

References

[1] Barnes N P, Rodriguez W J, Walsh. B M. Ho: Tm:YLF laser amplifiers[J]. J Opt Soc Am B, 1996, 13(12): 2872-2882

[2] Walsh B M, Barnes N P, Bartolo B D. On the distribution of energy between the Tm³ F ₄ and Ho⁵ I ₇ manifolds in Tm-sensitized Ho luminescence[J]. Journal of Luminescence, 1997, 75(1): 89-98

[3] Walsh B M, Barnes N P, Bartolo B D. The temperature dependence of energy transfer between the Tm³ F ₄ and Ho⁵ I ₇ manifolds in Tm-sensitized Ho luminescence in YAG and YLF[J]. Journal of luminescence, 2000, 90(5): 39-48

[4] Bourdet G L, Lescroart G. Theoretical modeling and design of a Tm,Ho:YliF4 microchip laser[J]. Appl Opt, 1999, 38(15): 275-3281

[5] Koch G J, Deyst J P, Storm M E. Single-frequency lasing of monolithic Ho,Tm:YLF[J]. Opt Lett, 1993, 18(15): 1235-1237

[6] Lee C J, Han G, Barnes N P. Ho:Tm lasers II: experiments[J]. IEEE Journal of Quantum Electrics, 1996, 32(1): 104-111

[7] Yang Wenqin. Sensitised luminescence of Ho³⁺ by Tm³⁺ in Tm,Ho coped YVO4 crystal[J]. Chinese Journal of Luminescence, 2001, 22(2): 175-181 (in Chinese)

[8] Doshida Minoru, Teraguchi Kazunari, Obara Minoru. Gain Measurement and Upconversion Analysis in Tm³⁺, Ho³⁺ Co-doped Aalumino-zirco-fluoride glass[J]. IEEE Journal of Quantum Electrics, 1995, 31(5): 910-915

[9] Storm M E. Holmium YLF amplifier performance and the prospects for multi-joule energies using diode-laser pumping[J]. IEEE Journal of Quantum Electrics, 1993, 29(2): 440-451

[10] Fan T Y, Byer R L. Diode laser-pumped solid-state lasers[J]. IEEE Journal of Quantum Electrics, 1988, 24(6): 895-911