Development of Cavity-Dumped Ti : sapphire Femtosecond Laser and its Amplifier

钛抛腔蓝宝石飞秒激光器及其放大器的研制

• 批准号: 10554034
• 负责人: TOMINAGA Keisuke
• 金额: $ 8.7万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10554034/
• 关键词: Ti : sapphire laser; femtosecond laser; cavity-dumper; multi-pass amplifire; ultrafast spectroscopy; キャビティ・タンパー; キャビティ・ダンパー

We have developed an intra-cavity dumped femtosecond Ti : sapphire laser system and its multi-pass amplifier to obtain a moderately high energy short pulse, enough to perform third order optical nonlinear experiment in liquid solutions. Currently, commercially available femtosecond Ti : sapphire laser systems are either (1)Ti : sapphire oscillator (general price = 18,000,000 yen), which yields a pulse with an energy of 4 nJ/pulse, or (2)Ti : sapphire oscillator and its amplifier (general price = 50,000,000 yen), which yields a pulse with an energy of 1 mJ/pulse. In order to perform experiment with a short pulse in chemical systems such as transient absorption or photon echo, we need a pulse with an energy around mJ/pulse to sub mJ/pulse. Therefore, a new short pulse laser system is desirable to get s moderately high energy pulse. In this research project we here calculated stability of oscillation for the cavity-dumped Ti : sapphire laser by the ABCD matrix formalism. We have investigated both the five-mirror configuration and six-mirror configuration theoretically and experimentally. The cavity dumper laser produces a pulse width of 13 fs and energy of 67 nJ/pulse at 4 MHz. Currently, a multi-pass (six-pass) amplifier with a Ti : sapphire crystal is being designed and constructed to get a higher energy pulse. The purpose of this amplifier is to get a pulse with an energy more than sub microJ/pulse at 20 kHz. We are also writing a manual to construct this laser system and are planning to distribute it to public.

我们研制了一种腔内倾倒飞秒钛蓝宝石激光系统及其多通放大器，以获得中等高能量的短脉冲，足以在液体溶液中进行三阶光学非线性实验。目前，商业上可用的飞秒Ti：蓝宝石激光系统是：(1)Ti：蓝宝石振荡器（一般价格= 1800万日元），它产生的脉冲能量为4 nJ/脉冲，或(2)Ti：蓝宝石振荡器及其放大器（一般价格= 5000万日元），它产生的脉冲能量为1 mJ/脉冲。为了在瞬态吸收或光子回波等化学系统中进行短脉冲实验，我们需要一个能量在mJ/脉冲附近的脉冲来低于mJ/脉冲。因此，需要一种新的短脉冲激光系统来获得中等高能量的脉冲。在本研究项目中，我们用ABCD矩阵的形式计算了腔倾倒Ti：蓝宝石激光器的振荡稳定性。我们从理论上和实验上研究了五镜构型和六镜构型。空腔转储激光器在4mhz时产生的脉冲宽度为13 fs，能量为67 nJ/脉冲。目前，一个多通（六通）放大器与Ti：蓝宝石晶体正在设计和构造，以获得更高的能量脉冲。该放大器的目的是在20khz时获得能量超过亚微j /脉冲的脉冲。我们也正在编写一个手册，以建立这个激光系统，并计划分发给公众。

项目成果

K.Ohta, T.J.Kang, K.Tominaga, and K.Yoshihara: "Femtosecond Time-resolved Fluorescence Studies of a Dye Molecule in Solution : Ultrafast Processes from a Higher Excited Electronic State"Chem. Phys.. 242. 103-114 (1999)

K.Ohta、T.J.Kang、K.Tominaga 和 K.Yoshihara：“溶液中染料分子的飞秒时间分辨荧光研究：来自更高激发电子态的超快过程”Chem。

K.Tominaga and H.Maekawa: "Development of Two-Dimensional Raman Spectroscopy by Higher-Order Optical Nonlinear Spectroscopy"J. Luminescence. (in press.).

K.Tominaga 和 H.Maekawa：“通过高阶光学非线性光谱开发二维拉曼光谱”J。

H. Shirota: ""Substituent Effect and Deuterium Isotope Effect of Ultrafast Intermolecular Electron Transfer : Coumarin in Electron Donating Solvent""J. Phys. Chem. A. 102. 3089-3102 (1998)

H. Shirota：“超快分子间电子转移的取代基效应和氘同位素效应：给电子溶剂中的香豆素”J。

K.Tominaga: "Recent Development of Nonlinear Spectroscopy in Liquids"Laser Chem.. 19. 117-122 (1999)

K.Tominaga：“液体中非线性光谱学的最新发展”Laser Chem.. 19. 117-122 (1999)

K.Tominaga: "Development of two-Dimensional al Raman Spectroscopy by Higher-Order Optical Nonlinear Spectroscopy"Journal of Lumimescience. (in press).

K.Tominaga：“通过高阶光学非线性光谱开发二维拉曼光谱”Lumimescience 杂志。