Femtosecond Optical Pulse Generation Using Laser Diodes

使用激光二极管生成飞秒光脉冲

• 批准号: 06555010
• 负责人: YAMASHITA Mikio
• 金额: $ 5.82万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555010/
• 关键词: femtosecond optical pulse; mutual induced phase modulation; heterodyne detection; time-division interferometer; nonlinear refractive index; pulse compression; laser diode; fiber; 高屈折率ガラス; 自己位相変調; 縮退4光波混合; 有機材料

The purpose of our study is to develop a highly-nonlinear device responding to femtosecond optical pulses and to find a method for optical pulse monocyclization to break through the present shortest pulse. Results of our study are summarized as follows.1. From the femtosecond optical pulse nonlinear propagation experimetnt in germanium oxide or erbium : germanium oxide doped silica fibers, we first evaluated their nonlinear refractive indices and response times. The nonlinear refractive indices are several times larger than that of a silica fiber and the response times are in a range of a few femtoseconds.2. We built up a highly sensitive femtosecond time-division interferometer using a heterodyne detection technique. With this interferometer, we evaluated the nonlinear refractive index in a highly lead oxide doped silica fiber to be about ten times larger than that of a silica fiber.3. Numerical calculation of femtosecond optical pulse nonlinear propagation in an organic crystal-cored … More fiber whose response time is 30 fs was performed. From this calculation, it was found that the influence of the delayd response on pulse compression can be compensated for by the third-order phase adjustment.4. Using a time-division interferometer, we first measured two (parallel and perpendicular) components of nonlinear-refractive-index change in carbon disulfide with high accuracy. We decomposed each component into three contributions based on decay time constants.5. An approach for generation of an ultrabroad-band optical pulse (550 THz width) is proposed, which is based on mutual induced phase modulation of three synchronized femtosecond pulses in a short fiber. These pulses having equidistant carrier frequencies and constant carrier-phase differences are obtained from the fundamental, the second-harmonic and the second-harmonic-pulse pumped parametric waves. Computer analysis shows that chirp of the composite wave at the fiber output can be compensated for by a spatial phase modulator and a 1.76-cycle pulse is generated. Less

我们的研究目的是开发一种响应飞秒光脉冲的高度非线性器件，并找到一种突破目前最短脉冲的光脉冲单环化方法。我们的研究结果总结如下：1。通过飞秒光脉冲在氧化锗或掺铒氧化锗二氧化硅光纤中的非线性传播实验，我们首先评估了它们的非线性折射率和响应时间。非线性折射率比硅光纤大几倍，响应时间在几飞秒范围内。我们利用外差探测技术建立了一个高灵敏度的飞秒时分干涉仪。利用该干涉仪，我们评估了高氧化铅掺杂二氧化硅光纤的非线性折射率约为二氧化硅光纤的十倍。对响应时间为30fs的有机晶体芯光纤中飞秒光脉冲非线性传输进行了数值计算。通过计算发现，延迟响应对脉冲压缩的影响可以通过三阶相位调整来补偿。首先利用时分干涉仪高精度地测量了二硫化碳非线性折射率变化的两个分量（平行分量和垂直分量）。我们根据衰减时间常数将每个分量分解为三个贡献。提出了一种基于短光纤中三个同步飞秒脉冲的互感应相位调制产生550太赫兹宽度的超宽带光脉冲的方法。这些脉冲具有等距载波频率和恒定载波相位差是由基波、次谐波和次谐波脉冲泵浦参数波获得的。计算机分析表明，复合波在光纤输出端的啁啾可以通过空间相位调制器进行补偿，产生一个1.76周期的脉冲。少

项目成果

R.Morita and M.Yamashita: "Control of femtosecond optical pulses using nonlinear organic materials" Ultrafast and Ultra-parallel Optoelectronics. 94-105 (1995)

R.Morita 和 M.Yamashita：“使用非线性有机材料控制飞秒光脉冲”超快和超并行光电子学。

山下幹雄: "未踏時間域の光波機能技術の創生" フェムト秒テクノロジーII. 17-21,48-50 (1995)

Mikio Yamashita：“在未探索的时域中创建光波功能技术”飞秒技术 II 17-21,48-50 (1995)

山下幹雄: "衝突パルスモード同期色素レーザー,カーレンズモード同期チタンファイアレーザー" レーザー研究. 24. 41- (1996)

Mikio Yamashita：“碰撞脉冲锁模染料激光器、克尔透镜锁模钛火激光器”激光研究。24. 41- (1996)。

R.Morita and M.Yamashita: "Compensation for the influence of the delayed nonlinear response on an organic crystal cored fiber for femtosecond optical pulse compression" Nonlinear Optics. in press (1994)

R.Morita 和 M.Yamashita：“补偿延迟非线性响应对飞秒光脉冲压缩有机晶芯光纤的影响”非线性光学。

M.Yamashita, R.Morita and Y.Sone: "Nonlinear optical properties of organic crystals and femtosecond optical pulse compression" The Rev.Laser Engi. 22. 81-90 (1994)

M.Yamashita、R.Morita 和 Y.Sone：“有机晶体的非线性光学特性和飞秒光脉冲压缩”Rev.Laser Engi。