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Abstract
In this paper, it is revealed that, degenerate two-photon lasers can show both lasing without inversion and without lasing, for two proper atom-field coupling coefficients, under the condition of equal atomic decay rates, not too large single-photon detunings, and not too saturation.
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HU XIANG-MING

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[1]	Yang Li-Jun, Ma Teng, Sun Ke-Jia, Feng Xiao-Min.Amplification without population inversion in tree-level system driven by an additional microwave field. Acta Physica Sinica, 2015, 64(6): 064205.doi:10.7498/aps.64.064205
[2]	Zhang Zhi-Ying, Fu Shen-Cheng, Gou Li-Dan, Yao Zhi-Hai.Phase and amplitude-dependent inversionless gain controlled by a three-level closed loop system. Acta Physica Sinica, 2013, 62(10): 104206.doi:10.7498/aps.62.104206
[3]	Zhang Bing, Liu Zhi-Xue, Xu Wan-Chao.Lasing without inversion with considering spontaneously generated coherence. Acta Physica Sinica, 2013, 62(16): 164207.doi:10.7498/aps.62.164207
[4]	Liang Ying, Jia Ke-Ning, Liu Zhong-Bo, Tong Dian-Min, Fan Xi-Jun.Effects of modulation of atomic injection and exit rate on spatial evolution of phase-dependent lasing without inversion gain and intensity in an open V-type system. Acta Physica Sinica, 2012, 61(18): 184207.doi:10.7498/aps.61.184207
[5]	Gao Qiang, Song Tong-Qiang.Laser without inversion in a Δ -configuration three-level system with cyclic transition. Acta Physica Sinica, 2012, 61(14): 144205.doi:10.7498/aps.61.144205
[6]	Yang Yan-Ling, Wang Lei, Liu Zhong-Bo, Lu Hong-Wu, Fan Xi-Jun.Effect of spontaneously generated coherence on transient evolution of LWI gain in an open Ladder type system. Acta Physica Sinica, 2009, 58(5): 3161-3165.doi:10.7498/aps.58.3161
[7]	Ma Hui, Bu Fan-Ge, Qiao Hong-Xia, Tong Dian-Min, Fan Xi-Jun.Phase control of inversionless gain in a closed atomic system with Doppler broadening. Acta Physica Sinica, 2008, 57(1): 206-211.doi:10.7498/aps.57.206
[8]	Chang Zeng-Guang, Liu Jian-Cheng, Yan Ke-Zhu.The comparison of steady-state gain of V-type and Λ-type atomic systems of lasing without inversion. Acta Physica Sinica, 2008, 57(8): 4927-4932.doi:10.7498/aps.57.4927
[9]	Wang Zhen-Hua, Hu Xiang-Ming.Role of selective excitation of dressed populations in lasing without inversion. Acta Physica Sinica, 2004, 53(8): 2569-2575.doi:10.7498/aps.53.2569
[10]	FAN XI-JUN, TIAN SHU-FEN, LI JIAN, LIU JIE, BAI CHENG-JIE.TIME EVOLUTION OF ATOMIC RESPONSE AND LIGHT AMPLIFICATION MECHANISM IN AN OPEN I NVERSIONLESS LASING SYSTEM. Acta Physica Sinica, 2000, 49(9): 1719-1725.doi:10.7498/aps.49.1719
[11]	FAN YA-JING, HU XIANG-MING.ATOMIC COHERENCE CREATED BY SPONTANEOUS EMISSION IN A Λ SYSTEM:LASING WITHOUT INVERSION. Acta Physica Sinica, 1999, 48(12): 2241-2245.doi:10.7498/aps.48.2241
[12]	ZHANG HAN-ZHUANG, GAO JIN-YUE.TRANSVERSE DIFFRACTION EFFECTS OF LIGHT FIELDS ON THE GAIN WITHOUT POPULATION INVERSION. Acta Physica Sinica, 1997, 46(12): 2330-2343.doi:10.7498/aps.46.2330
[13]	HU XIANG-MING, WANG DE-XIN.ATOMIC COHERENCE INDUCED BY TWO-PHOTON PROCESS——TRANSITION FROM LASING WITH INVERSION TO LASING WITHOUT INVERSION. Acta Physica Sinica, 1997, 46(1): 61-68.doi:10.7498/aps.46.61
[14]	Hu Xiang-Ming.. Acta Physica Sinica, 1995, 44(3): 401-408.doi:10.7498/aps.44.401
[15]	LUO ZHEN-FEI, XU ZHI-ZHAN, LIN FU-CHENG.LASING WITHOUT INVERSION: GAIN AND SATURATION. Acta Physica Sinica, 1994, 43(2): 219-224.doi:10.7498/aps.43.219
[16]	LUO ZHEN-FEI, XU ZHI-ZHAN.EXTERNAL-FIELD-INDUCED COHERENCE AND LASING WITHOUT INVERSION: THE V-TYPE SYSTEM. Acta Physica Sinica, 1993, 42(2): 252-255.doi:10.7498/aps.42.252
[17]	LUO ZHEN-FEI, XU ZHI-ZHAN, ZHANG WEN-QI.AN ANY-STATE-INVERSIONLESS LASER. Acta Physica Sinica, 1993, 42(8): 1231-1235.doi:10.7498/aps.42.1231
[18]	HU XIANG-MING.LASERS WITHOUT INVERSION VIA OPTICAL PUMPING. Acta Physica Sinica, 1993, 42(12): 1928-1932.doi:10.7498/aps.42.1928
[19]	HU XIANG-MING.DEGENERATE QUANTUM-BEAT LASER. Acta Physica Sinica, 1992, 41(11): 1782-1788.doi:10.7498/aps.41.1782
[20]	TAN WEI-HAN, LIN ZUN-QI, YU WEN-YAN, GU MIN, CHEN WEN-HUA, ZHENG YU-XIA, WANG GUAN-ZHI, CUI JI-XIU, CHENG RUI-HUA, DENG XI-MING.HIGH SOFT X-RAY POPULATION INVERSION OBSERVED IN A LASER-IRRADIATED MICRO-TUBE. Acta Physica Sinica, 1988, 37(6): 989-995.doi:10.7498/aps.37.989

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Vol. 43, Issue 7 - 1994-04-05

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