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Laser induced amplified spontaneous emission from the high Rydberg states of diatomic molecules

双原子分子高里德伯态的激光诱导放大自发发射

基本信息

批准号：
10640497
负责人：
TSUKIYAMA Koichi
金额：
$ 2.11万
依托单位：
Science University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Amplified spontaneous emission (ASE) from single rotational levels of 3dσ, π H ィイD12ィエD1ΣィイD1+ィエD1, H' ィイD12ィエD1Π and nf (n = 4-6) Rydberg states of NO has been investigated through optical-optical double resonance excitation via the A ィイD12ィエD1ΣィイD1+ィエD1 state. The H, H'→ 3pσ, π D ィイD12ィエD1ΣィイD1+ィエD1, C ィイD12ィエD1Π (0, 0) systems were rotationally resolved. The mixing of the C ィイD12ィエD1Π(v = 0) state with the valence B ィイD12ィエD1Π(v = 7) state explained the rotational pattern successfully. The degree of polarization of ASE for these transitions was measured and compared with theoretical values of the corresponding resonant fluorescence. As the major ASE relaxation channels from the 4f and 5f (v = 0) states, transitions down to the 3d and 4d (v = 0) Rydberg series were identified,respectively.A new ASE relaxation pathway,6f → 5g,was found in addition to the 6f → 5d band. The ASE from the 7f (v =1) state located above the ionization threshold was observed for the first time.The effect of externally injected radiation on the two-photon laser induced amplified spontaneous emission (LI-ASE) has been stuied. The wave generated via the same LI-ASE process in a seeder cell acts as a seeder field for the inverted medium created in a main cell. A nearly tenfold gain is achieved in the BィイD11ィエD1ΣィイD1+ィエD1 → AィイD11ィエD1Π (0, 3) transition of the CO molecule. We demonstrate that the single rotational transition in the BィイD11ィエD1ΣィイD1+ィエD1 → AィイD11ィエD1Π(0, 4) band is selectively amplified by injection of laser radiation. The polarization effect of the input laser radiation implied that the inverted medium in the main cell serves as an amplifier while maintaining the polarization anisotropy driven by two-photon excitation.

通过光-光双共振激发，研究了NO分子3dσ，π H D 12 D 1 D 1 + D 1，H'D 12 D 1和nf（n = 4-6）Rydberg态的单转动能级的放大自发辐射（ASE）. H，H ′ → 3pσ，π D → D_（12）→ D_（1 + C）→ D_（12）→ D_（1 + C）→ D_（1 + C → D_（12）→ D_（1）→（v = 0）态与价态B → D_（12）→ D_（1）→（v = 7）态的混合成功地解释了转动模式。测量了这些跃迁的ASE偏振度，并与相应共振荧光的理论值进行了比较。在4f和5 f（v = 0）态的ASE弛豫通道中，分别发现了3d和4d（v = 0）Rydberg系列跃迁，并发现了6 f → 5d的ASE弛豫通道.首次观察到7 f（v =1）态在电离阈值以上的自发辐射，研究了外注入辐射对双光子激光诱导放大自发辐射（LI-ASE）的影响。在种子单元中通过相同的LI-ASE过程产生的波充当在主单元中创建的反转介质的种子场。在CO分子的B → D_（11）（0，3）跃迁中获得了近10倍的增益。我们证明了B能级D11跃迁D1 → A能级输入激光辐射的偏振效应意味着主单元中的倒置介质充当放大器，同时保持由双光子激发驱动的偏振各向异性。