摘要
利用Hg原子6~1S_0—6~1D_2和6~1S_0—6~3D_2双光子共振的四波差频(2ω_1—ω_3),获得了真空紫外相干辐射(ω_4)。当入射光之一(ω_3)波长调谐时,产生的真空紫外光也是调谐的,调谐范围为184.9-187.5nm.本文对非线性频率变换过程的机理,如双光子和单光子共振增强效应,相位匹配等进行了研究。对影响转换效率的有关竞争过程和饱和效应作了分析。利用产生的调谐真空紫外辐射记录了空气中O_2分子的吸收谱。
Vacuum-ultra violet radiation is generated by 6'S0-61D2 or 61S0-63D2 two photon resonant four-wave difference mixing (ω4=2ω1-ω3) in Hg vapor. VUV radiation is tunable when one of the input wave (ωs) is tuned, the tuning range is 184.9-187.5 nm. The mechanism of this frenquency conversion, for example, the two-photon and single-photon resonant enhancement and phase matching have been investigeted. The competing processes and saturation effect on conversion efficiency have been analyzed. Using the generated tunable VUV radiation, we have recorded the absorption spetrum of O2 in air.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第9期1385-1392,共8页
Acta Physica Sinica
