Purchase of a Tunable-Wavelength Amplified Femtosecond Laser for Transient Spectroscopy and Microfabrication

在化学研究仪器和设施-多用户仪器（CRIF-MU）计划的支持下，加州大学洛杉矶分校化学与生物化学系将购买可调谐波长放大飞秒激光器。该设备将加强瞬态光谱和微加工领域的研究，包括：1)测量分子罗盘和陀螺仪的旋转运动，并研究“光子制动器”的可能发展；2)利用新型光敏溶胶-凝胶基光刻胶开发直接双光子三维陶瓷金属氧化物微加工；3)利用两脉冲和三脉冲飞秒瞬态吸收和荧光光谱对溶液中的化学键动力学进行基础研究；4)了解如何通过在介孔二氧化硅中封装来控制半导体聚合物链的构象，从而导致新的电子性能。飞秒激光器通过相干可见光或红外光提供峰值功率高的超快脉冲，使研究人员能够研究非线性过程并获得快速发生的化学反应的重要信息。它的使用可能使我们对反应性和非反应性分子性质的理解取得突破。

AbstractWith support from the Chemistry Research Instrumentation and Facilities - Multiuser Instrumentation (CRIF-MU) Program, the Department of Chemistry & Biochemistry at the University of California Los Angeles will purchase a tunable-wavelength amplified femtosecond laser. This equipment will enhance research in a number of areas in transient spectroscopy and microfabrication including: 1) measurement of the rotational motions of molecular compasses and gyroscopes, and investigation of the possible development of a "photonic brake", 2) development of direct two-photon, three-dimensional microfabrication of ceramic metal oxides using novel photosensitive sol-gel-based photoresists, 3) fundamental investigations of chemical bond dynamics in solution using two- and three pulse femtosecond transient absorption and fluorescence spectroscopies, and 4) understanding how controlling the conformation of semiconducting polymer chains via encapsulation in mesoporous silica leads to new electronic properties.A femtosecond laser provides ultrafast pulses with high peak power via coherent visible or infrared light, which enables researchers to study nonlinear processes and obtain important information about fast occurring chemical reactions. Its use may enable breakthroughs in our understanding of the properties of reactive and nonreactive molecules.