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的化学与生物化学系将购买一台波长可调的放大飞秒激光器。该设备将加强在瞬变光谱和微制造领域的研究，包括：1)测量分子罗盘和陀螺仪的旋转运动，并研究可能开发的“光子刹车”；2)利用新型光敏溶胶-凝胶型光致抗蚀剂开发直接双光子、三维微制造金属陶瓷氧化物；3)使用双脉冲和三脉冲飞秒瞬时吸收和荧光光谱对溶液中化学键动力学进行基础研究；以及4)了解通过在介孔二氧化硅中包裹半导体高分子链的构象是如何导致新的电子性质的。飞秒激光通过相干可见光或红外光提供具有高峰值功率的超快脉冲，这使得研究人员能够研究非线性过程并获得关于快速发生的化学反应的重要信息。它的使用可能会使我们对活性和非活性分子的性质的理解有所突破。

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.