Generation of Intense THz Pulsed Lasers Pumped Strongly by CO2 Pulsed Lasers
QI Chun-Chao, CHENG Zu-Hai
1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 4300742College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
Generation of Intense THz Pulsed Lasers Pumped Strongly by CO2 Pulsed Lasers
QI Chun-Chao, CHENG Zu-Hai
1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 4300742College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
摘要A theoretical method dealing with two intense laser fields interacting with a three-level molecular system is proposed. A discussion is presented on the properties of the solutions for time-independent and time-dependent absorption coefficients and gain coefficient on resonance for strong laser fields, based on analytic evaluation of the rate equations for a homogeneously broadened, three-level molecular system. The pump intensity range can be estimated according to the analytic expression of pump saturation intensity. The effects of pulse width, gas pressure and path length on the energy absorbed from pump light are studied theoretically. The results can be applied to the analysis of pulsed, optically pumped terahertz lasers.
Abstract：A theoretical method dealing with two intense laser fields interacting with a three-level molecular system is proposed. A discussion is presented on the properties of the solutions for time-independent and time-dependent absorption coefficients and gain coefficient on resonance for strong laser fields, based on analytic evaluation of the rate equations for a homogeneously broadened, three-level molecular system. The pump intensity range can be estimated according to the analytic expression of pump saturation intensity. The effects of pulse width, gas pressure and path length on the energy absorbed from pump light are studied theoretically. The results can be applied to the analysis of pulsed, optically pumped terahertz lasers.
[1] Chang T Y and Bridge T J 1970 Opt. Commun. 1423 [2] Zhang X.-C, 2002 Phys. Med. Biol. 47 1 [3] Mittleman D 2003 Sensing with Terahertz Radiation(Berlin: Springer) [4] Peier P, Pilz S, M\"{uller F, Nelson K A and Feurer T2008 J. Opt. Soc. Am. B 25 B70 [5] Singh R, Azad A K, O'Hara J F, Taylor A J and Zhang W L2008 Opt. Lett. 33 1506 [6] Viscovini R C, Cruz F C and Pereira D 2005 IEEE J.Quantum Electron. 41 694 [7] Carelli G, Michele A D and Moretti A 2006 IEEE J.Quantum Electron. 42 378 [8] Javan A 1957 Phys. Rev. 107 1579 [9] Panock R L and Temkin R J 1977 IEEE J. QuantumElectron. 13 425 [10] Heppner J, Weiss C O and Schinn G 1980 IEEE J.Quantum Electron. 16 392 [11] Weiss C O 1976 IEEE J. Quantum Electron. 12580 [12] Bluyssen H J A, McIntosh E R E, van Etteger A F and WyderP 1975 IEEE J. Quantum Electron. 11 341 [13] Written W J 1987 The CO$_2$ Laser (Berlin:Springer) [14] Weitz W and Flynn G W 1973 J. Chem. Phys. 582781 [15] Hodges D T, Foote F B and Reel R D 1976 Appl. Phys.Lett. 29 662 [16] Rosenbluh M, Temkin R J and Button K J 1976 Appl.Opt. 15 2635 [17] Cheo P K 1987 Handbook of Molecular Lasers (NewYork: Dekker)
2009, Vol. 26 
