We demonstrate the feasibility of utilizing the so-called 'double-dark' scheme of four-level atomic coherence to obtain strong laser gain in the ultra-violet and vacuum ultra-violet. Furthermore, we show a new technique for eliminating Doppler broadening in a large class of multi-level (greater than or equal to 4) schemes. A specific application of these ideas to cw lasing at 253 nm and 185 nm in Hg is presented. (C) 2000 Elsevier Science B.V. All rights reserved.
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Guangdong Univ Technol, Expt Teaching Ctr, Guangzhou 510006, Guangdong, Peoples R China
S China Normal Univ, Inst Optoelect Mat & Technol, Guangzhou 510631, Guangdong, Peoples R ChinaNanchang Univ, Engn Res Ctr Nanotechnol, Nanchang 330047, Peoples R China
Chen Jun
Liu Zheng-Dong
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Nanchang Univ, Engn Res Ctr Nanotechnol, Nanchang 330047, Peoples R China
Nanchang Univ, Inst Modern Phys, Nanchang 330031, Peoples R ChinaNanchang Univ, Engn Res Ctr Nanotechnol, Nanchang 330047, Peoples R China
Liu Zheng-Dong
Zheng Jun
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Nanchang Univ, Inst Modern Phys, Nanchang 330031, Peoples R ChinaNanchang Univ, Engn Res Ctr Nanotechnol, Nanchang 330047, Peoples R China
Zheng Jun
Pang Wei
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Guangdong Univ Technol, Expt Teaching Ctr, Guangzhou 510006, Guangdong, Peoples R ChinaNanchang Univ, Engn Res Ctr Nanotechnol, Nanchang 330047, Peoples R China
Pang Wei
You Su-Ping
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Hangzhou Dianzi Univ, Dept Phys, Hangzhou 310018, Peoples R ChinaNanchang Univ, Engn Res Ctr Nanotechnol, Nanchang 330047, Peoples R China