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This paper, based on the rate equation theory, astablishes a model for optical pump waveguides to generate terahertz laser. By analyzing and solving the rate equation, the expressions of pump absorption coefficient, terahertz small-signal gain coefficient and terahertz output power are obtained. The calculation shows that the THz power increases first and reduces gradually with the increase of pressure of the working material, and it will increase with the increase of pumping power and the decrease of the output mirror reflectivity. The best working pressure increases with the rise of the pumping power. The number of particles in the excited state and the THz flux increase in the waveguide radial direction from the center, while the small-signal gain coefficient shows the opposite trend. Pump saturation, weak pump absorption and excited state terahertz absorption are the primary cause limiting the increase of the laser conversion efficiency. Results based on this model are in good agreement with the data from the relevant literature.
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Keywords:
- terahertz /
- continuous wave /
- optical pump /
- waveguide
[1] Ferguson B, Zhang X C 2002 Nature 1 26
[2] Zhang X B, Shi W 2006 Acta Phys. Sin. 55 5237 (in Chinese) [张显斌, 施卫 2006 55 5237]
[3] He Z H, Yao J Q, Shi H F, Huang X, Luo X Z, Jiang S J, Wang P 2007 Acta Phys. Sin. 56 5802 (in Chinese) [何志红, 姚建铨, 时华锋, 黄晓, 罗锡璋, 江绍基, 王鹏 2007 56 5802]
[4] Cheo P K 1987 Handbook of Molecular Laser (New York: Marcel Dekker Inc.) pp497–636
[5] Jiu Z X, Zuo D L, Miao L, Qi C C, Cheng Z H 2010 Chin. Phys. Lett. 27 024211
[6] Tobin M S 1985 Proc. IEEE 73 61
[7] Zhong K, Yao J Q, Xu D G, Zhang H Y, Wang P 2011 Acta Phys. Sin. 60 034210 (in Chinese) [钟凯, 姚建铨, 徐德刚, 张会云, 王鹏 2011 60 034210]
[8] Zhang T Y, Cao J C 2004 Chin. Phys. B 13 1742
[9] Zhang C H, Wang Y Y, Gai B, Chen J, Tang L, Xu W W, Wu P H 2007 Cryogenics and Superconductivity 35 245 (in Chinese) [张彩虹, 王媛媛, 盖博, 陈健, 康琳, 许伟伟, 吴培亨 2007 低温与超导 35 245]
[10] He Z H 2007 Ph. D. Dissertation (Tianjin; Tianjin University) (in Chinese) [何志红 2007 博士学位论文 (天津: 天津大学)]
[11] Shen J E, Rong J, Liu W X 2006 Infrared and Laser Engineering 35 342 (in Chinese) [申金娥, 荣健, 刘文鑫 2006 激光与红外 35 342]
[12] Yao J Q, Chi N, Yang P F, Cui H X, Wang J L, Li J S, Xu D G, Ding X 2009 Chinese Journal of Laser 36 2213 (in Chinese) [姚建铨, 迟楠, 杨鹏飞, 崔海霞, 汪静丽, 李九生, 徐德刚, 丁鑫 2009 中国激光 36 2213]
[13] Gregory S, Herman 1994 SPIE 2379 291
[14] Xie H Y, Wang L, Zhao L J, Zhu H L, Wang W 2007 Chin. Phys. B 16 1459
[15] Henningsen J O, Jensen H G 1975 IEEE J. Quantum Elect. 11 248
[16] Mansfield D K, Horlbeck E, Bennett C L, Chouinard R 1985 International Journal of Infrared and Millimeter Waves 6 867
[17] DeTemple T, Danielewicz E 1976 IEEE J. Quantum Elect. 12 40
[18] Christenen C P, Freed C, Haus H A 1969 IEEE J. Quantum Elect. 5 276
[19] Zhou B K, Gao Y Z, Chen T R, Chen J H 2010 Principles of Laser (Vol.6) (Beijing: National Defence Industry Press) pp123–158 (in Chinese) [周炳琨, 高以智, 陈倜嵘, 陈家骅 2010 激光原理 (第6版) (北京: 国防工业出版社) 第123–158 页]
[20] Freund S M, Duxbury G, Romheld M, Tiedje J T, Oka T 1974 J. Mol. Spectrosc. 52 38
[21] Weitz E, Flynn G W 1973 J. Chem. Phys. 58 2781
[22] Frenkel L, Marantz H, Sullivan T 1971 Phys. Rev. A 3 1640
[23] Abrams R L 1972 IEEE J. Quantum Elect. 8 838
[24] Marcatili E A J, Schmeltzer R A 1964 Bell Syst. Tech. J. 62 1783
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[1] Ferguson B, Zhang X C 2002 Nature 1 26
[2] Zhang X B, Shi W 2006 Acta Phys. Sin. 55 5237 (in Chinese) [张显斌, 施卫 2006 55 5237]
[3] He Z H, Yao J Q, Shi H F, Huang X, Luo X Z, Jiang S J, Wang P 2007 Acta Phys. Sin. 56 5802 (in Chinese) [何志红, 姚建铨, 时华锋, 黄晓, 罗锡璋, 江绍基, 王鹏 2007 56 5802]
[4] Cheo P K 1987 Handbook of Molecular Laser (New York: Marcel Dekker Inc.) pp497–636
[5] Jiu Z X, Zuo D L, Miao L, Qi C C, Cheng Z H 2010 Chin. Phys. Lett. 27 024211
[6] Tobin M S 1985 Proc. IEEE 73 61
[7] Zhong K, Yao J Q, Xu D G, Zhang H Y, Wang P 2011 Acta Phys. Sin. 60 034210 (in Chinese) [钟凯, 姚建铨, 徐德刚, 张会云, 王鹏 2011 60 034210]
[8] Zhang T Y, Cao J C 2004 Chin. Phys. B 13 1742
[9] Zhang C H, Wang Y Y, Gai B, Chen J, Tang L, Xu W W, Wu P H 2007 Cryogenics and Superconductivity 35 245 (in Chinese) [张彩虹, 王媛媛, 盖博, 陈健, 康琳, 许伟伟, 吴培亨 2007 低温与超导 35 245]
[10] He Z H 2007 Ph. D. Dissertation (Tianjin; Tianjin University) (in Chinese) [何志红 2007 博士学位论文 (天津: 天津大学)]
[11] Shen J E, Rong J, Liu W X 2006 Infrared and Laser Engineering 35 342 (in Chinese) [申金娥, 荣健, 刘文鑫 2006 激光与红外 35 342]
[12] Yao J Q, Chi N, Yang P F, Cui H X, Wang J L, Li J S, Xu D G, Ding X 2009 Chinese Journal of Laser 36 2213 (in Chinese) [姚建铨, 迟楠, 杨鹏飞, 崔海霞, 汪静丽, 李九生, 徐德刚, 丁鑫 2009 中国激光 36 2213]
[13] Gregory S, Herman 1994 SPIE 2379 291
[14] Xie H Y, Wang L, Zhao L J, Zhu H L, Wang W 2007 Chin. Phys. B 16 1459
[15] Henningsen J O, Jensen H G 1975 IEEE J. Quantum Elect. 11 248
[16] Mansfield D K, Horlbeck E, Bennett C L, Chouinard R 1985 International Journal of Infrared and Millimeter Waves 6 867
[17] DeTemple T, Danielewicz E 1976 IEEE J. Quantum Elect. 12 40
[18] Christenen C P, Freed C, Haus H A 1969 IEEE J. Quantum Elect. 5 276
[19] Zhou B K, Gao Y Z, Chen T R, Chen J H 2010 Principles of Laser (Vol.6) (Beijing: National Defence Industry Press) pp123–158 (in Chinese) [周炳琨, 高以智, 陈倜嵘, 陈家骅 2010 激光原理 (第6版) (北京: 国防工业出版社) 第123–158 页]
[20] Freund S M, Duxbury G, Romheld M, Tiedje J T, Oka T 1974 J. Mol. Spectrosc. 52 38
[21] Weitz E, Flynn G W 1973 J. Chem. Phys. 58 2781
[22] Frenkel L, Marantz H, Sullivan T 1971 Phys. Rev. A 3 1640
[23] Abrams R L 1972 IEEE J. Quantum Elect. 8 838
[24] Marcatili E A J, Schmeltzer R A 1964 Bell Syst. Tech. J. 62 1783
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