Analysis of the temperature characteristics of a Cr,Tm,Ho:YAG laser

GUO Jia-wei; LI Tong; NIU Rui-hua; XUE Liang-ping; LI Yan-ling; WANG Hong-yuan

doi:10.3969/j.issn.1001-3806.2011.06.010

In order to analyze the temperature characteristics in the stimulated emission of a CTH:YAG laser, taking the quasi-three-level characteristics of CTH:YAG and the influence of Tm-Ho quasi-thermal equilibrium system into account, a so-called relative oscillation efficiency parameter was defined based on the photon density in the rate equation. The numerical simulation results show that relative oscillation efficiency is a nonlinear decreasing function of temperature, and there is a stop temperature at which the stimulated emission can not happen. The stop temperature is in direct proportion to the energy stored by Tm-Ho quasi-thermal equilibrium system, and relative oscillation efficiency also augments with the stored energy rising. The analysis provides a theoretical evidence of the temperature characteristics of CTH:YAG, and is useful for optimizing the output pulse.

Analysis of the temperature characteristics of a Cr,Tm,Ho:YAG laser

Corresponding author: NIU Rui-hua, 2008nrh@163.com;

1. Southwest Institute of Technical Physics, Chengdu 610041, China;

2. College of Electronics and Information Technology, Sichuan University, Chengdu 610064, China

Received Date: 2011-01-27

Accepted Date: 2011-03-09

Available Online: 2011-11-25

Abstract: In order to analyze the temperature characteristics in the stimulated emission of a CTH:YAG laser, taking the quasi-three-level characteristics of CTH:YAG and the influence of Tm-Ho quasi-thermal equilibrium system into account, a so-called relative oscillation efficiency parameter was defined based on the photon density in the rate equation. The numerical simulation results show that relative oscillation efficiency is a nonlinear decreasing function of temperature, and there is a stop temperature at which the stimulated emission can not happen. The stop temperature is in direct proportion to the energy stored by Tm-Ho quasi-thermal equilibrium system, and relative oscillation efficiency also augments with the stored energy rising. The analysis provides a theoretical evidence of the temperature characteristics of CTH:YAG, and is useful for optimizing the output pulse.

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Reference (19)

[1]	YE H B,ZHU Ch J,LI Zh J.Present development of Cr,Tm,Ho:YAG laser at 2.1μm wavelength[J].Laser Technology,1996,20(4):253-256(in Chinese).
[2]	YE H B,KUANG N J,ZHU Ch H,et al.Ho:YAG laser with 3J output operating at room temperature and 2.1μm wavelength[J].Laser Technology,1996,20(6):352-355(in Chinese).
[3]	CHEN Ch Sh,WANG J,SONG Zh H,et al.Experimental study of Q-switehed Cr,Tm,Ho:YAG laser[J].Chinese Journal of Quantum Electronics,1998,15(6):564-571(in Chinese).
[4]	JANI M G, BARNES N P,MURRAY K E.Flash-lamp-pumped Ho:Tm:Cr:YAG and Ho:Tm:Er:YLF lasers:experimental results of a single,long pulse length comparison[J].Applied Optics,1997,36(15):3357-3362.
[5]	BOWMAN S R,WININGS M J,SEARLES S,et al.Short-pulsed 2.1μm laser performance of Cr,Tm,Ho:YAG[J].IEEE Journal of Quantum Electronics,1991,27(5):1129-1131.
[6]	YAO Y Ch,LI Zh J,HUANG Ch Y,et al.Study of the medical Cr,Tm,Ho:YAG laser system[J].Applied Laser,2006,26(4):239-242(in Chinese).
[7]	YAO Y Ch,LI Zh J,HUANG Ch Y,et al.Theoretical simulation of Cr,Tm,Ho:YAG laser[J].Acta Photonica Sinica,2007,36(7):1351-1355(in Chinese).
[8]	BOWMAN S R,WININGS M J,AUYEUNG R C Y,et al.Laser and spectral properties of Cr,Tm,Ho:YAG at 2.1μm[J].IEEE Journal of Quantum Electronics,1991,27(9):2142-2149.
[9]	LI Y L,ZENG Q Y,LI T,et al.Experimental study of Cr,Tm,Ho:YAG lasers[J].Laser Technology,2008,32(6):563-565(in Chinese).
[10]	GRUBER J B,HILLS M E,SELTZER M D,et al.Energy levels and crystal quantum states of trivalent holmium in yttrium aluminum garnet[J].Journal of Applied Physics,1991,69(12):8183-8204.
[11]	SOUSA J M,SALCEDO J R,KUZMIN V V.Simulation of laser dynamics and active Q-switching in Tm,Ho:YAG and Tm:YAG lasers[J].Applied Physics,1997,B64(1):25-36.
[12]	GUO J W,LI T,NIU R H,et al.The analysis of the effective inversion reduction factor of Cr,Tm,Ho:YAG laser[J].Laser & Infrared,2010,40(12):1310-1315(in Chinese).
[13]	KOECHNER W.Solid-state laser engineering[M].Beijing:Science Press,2002:14-22,79-80(in Chinese).
[14]	DEGNAN J J.Theory of the optimally coupled Q-switched laser[J].IEEE Journal of Quantum Electronics,1989,25(2):214-220.
[15]	HUANG L L,JI Y X,CHEN X Zh.Spectrum characteristic of YAG crystals doped Cr3+,Tm3+,Ho3+ ions[J].Journal of Synthetic Crystals,1997,26(2):112-116(in Chinese).
[16]	HUANG L L,CHEN X Zh,JI Y X.Optical paramenters of Ho3+ ions in YAG and YLF crystals[J].Optical Instrument,1997,19(4/5):45-50(in Chinese).
[17]	BASIEV T T,ORLOVSKII Y V,PUKHOV K K,et al.Multiphonon relaxation rates measurements and theoretical calculations in the frame of non-linear and non-Coulomb model of a rare-earth ion-ligand interaction[J].Journal of Luminescence,1996,68(5):241-253.
[18]	HUANG L L.Analysis for fluorescence charecteristic of Tm3+ ions in YAG crystal[J].Acta Photonica Sinica,1996,16(4):420-425(in Chinese).
[19]	FAN T Y,HUBER G,BYER R L,et al.Spectroscopy and diode laser-pumped operation of Tm,Ho:YAG[J].IEEE Journal of Quantum Electronics,1988,24(6):924-933.

Analysis of the temperature characteristics of a Cr,Tm,Ho:YAG laser

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