Manipulation of population transfer by stimulated emission process

两种技术已经开发用于控制级联型放大自发发射途径在NO里德伯态。第一种方法，称为切换，是基于破坏放大所需的种群反转。第二种方法叫播种，是利用外场的注入。在播种细胞中产生的弱ASE辐射与泵浦光束共线传播，充当主细胞中反向介质的播种光。通过光学滤波提取所需的种子波长，实现了所选电子跃迁的放大。此外，利用它们不同的极化特性，在属于同一rydberg体系的旋转跃迁之间实现了选择性增强。最后，我们证明了交换和播种的结合使用提供了旋转选择性。研究了外注入辐射对双光子激光诱导放大自发发射（LI-ASE）的影响。在播种单元中通过相同的LI-ASE过程产生的波充当主单元中产生的反向介质的播种场。在CO分子的B1Z+→A1II（0,3）跃迁中获得了近10倍的增益。我们证明了B1Z+→A1II（0,4）带的单旋转跃迁被激光辐射选择性地放大。这种泵和种子的排列通过简单地调整种子激光频率来促进分子光谱的检测。

Two techniques have been developed for control of cascade-type amplified spontaneous emission pathways in the NO Rydberg states. The first method, referred to as switching, is based on destruction of the population inversion required for amplification. The second method, called seeding, utilizes the injection of external field. The weak ASE radiation generated in a seeder cell travels collinearly with pump beams, acting as seeder light for the inverted medium in a main cell. By extracting desired seeder wavelengths with optical filtering, amplification of the selected electronic transition is realized. In addition, selective enhancement between the rotational transitions belonging to the same inter-Rydberg system is achieved by taking advantage of their different polarization properties. Finally, we demonstrated that the combined use of switching and seeding provided with rotational selectivity.The effect of externally injected radiation on the two-photon laser induced amplified spontaneous emission (LI-ASE) has been investigated. 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 B1Z+→A1II(0, 3) transition of the CO molecule. We demonstrate that the single rotational transition in the B1Z+→A1II(0, 4) band is selectively amplified by injection of laser radiation. This pump and seed arrangement facilitates detection of molecular spectra by simply tuning the seed laser frequency.