Visible Molecular Lasers - REU Supplement

这项研究计划是激光实验工作的继续 物理学由NSF资助ECS-8411743支持。 它的目标是 开发新的和有效的可调谐相干辐射源 在可见光和紫外光谱区域， 了解发生在现有和 潜在的新来源。 一个实验旨在证明 可见光泵浦连续HgBr、HgI或PbI激光器。 HgBr 2、HgI 2或PbI 2的电或光解离将是 接着光学激发（用CW UV激光器或弧光灯）， 从基态到B态。 阈值泵浦功率的测量 为了这个激光器和研究使用同位素富集 金属卤化物盐，以提高小信号增益是两个 这是本研究的最初目标。 还建议进行研究， 研究准连续氟化碘（IF）激光泵浦的可行性 通过从N2或CO的最低亚稳态的激发转移。 电子束产生的亚稳态分子将与I2混合， F2在圆柱形喷嘴布置和增益的存在 用连续波染料激光探测到的 微波探测实验将 研究激发态碰撞对能量的限制 活性介质的负载。

This research program is a continuation of experimental work in laser physics supported under NSF grant ECS-8411743. Its goals are the development of new and efficient sources of tunable coherent radiation in the visible and ultraviolet spectral regions, and a better understanding of the fundamental processes occurring in existing and potential new sources. One experiment is designed to demonstrate an optically-pumped, continuous HgBr, HgI or PbI laser in the visible. The electrical or optical dissociation of HgBr2, HgI2 or PbI2 would be followed by optically exciting (with a CW UV laser or an arc lamp) the B state from the ground state. Measuring the threshold pumping power for this laser and investigating the use of isotopically-enriched metal-halide salts to enhance the small-signal gain are two of the primary initial goals of this research. Also proposed are studies to examine the feasibility of a quasi-CW Iodine Fluoride (IF) laser pumped by excitation transfer from the lowest metastable state of N2 or CO. Electron beam-produced metastable molecules would be mixed with I2 and F2 in a cylindrical nozzle arrangement and the presence of gain detected with a CW dye laser. Microwave probing experiments will investigate the limitations posed by excited state collisions on energy loading of the active medium.