Study on ultra-fast nonlinear optical functional devices

超快非线性光学功能器件研究

基本信息

批准号：
07555010
负责人：
KAWAGUCHI Hitoshi
金额：
$ 6.21万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555010/
关键词：
Semiconductor laser Semiconductor optical amplifier Four-wave mixing Mode-locking Generation of ultrashort optical pulse Wavelength conversion Optical sampling Compression of optical pulse 偏波面自己変調

项目摘要

We have investigated mainly the following four topics to create new nonlinear optical functional devices.(1) Highly nondegenerate four-wave mixing in a semiconductor optical amplidierWe have demonstrated the highly nonfegenerate four-wave mixing (FWM) among subpicosecond optical pulses in a 1.3-mum multiple-quantum-well (MQW) semiconductor optical amplifier (SOA). We could directly measure the FWM signal in the output spectrum by current pulse pumping of the device. We achieved a high conversion efficiency of over 10% at a frequency conversion range of less than 1 TH_z.(2) Optical sampling using FWM in a SOAWe have demonstrated ultra-fast optical sampling using the FWM process in an SOA.A signal light and a sampling light are injected into an SOA as a probe light and a pump light, respectively. We can measure the sampling waveform as the envelope of the FWM signal. The result shows good linear relation between the FWM intensity and input probe energy for an input energy of 1 fJ to 0.1 pJ.(3) Suppression of multiple pulse formation in mode-locked laser diodesWe have proposed a new method for obtaining short optical pulses without trailing pulses from an actively mode-locked laser diode. A part of the output is reflected back into the laser diode with an orthogonal polarization. The trailing pulses caused both by the excess gain and the residual reflection at the laser diode facet are drastically suppressed. We experimentally demonstrated the reduction of the trailing pulses caused by the excess gain using 1.55mum In G_aA_sP laser diodes.(4) Sub-picosecond optical pulse generation from a mode-locked laser diodeWe have generated short optical pulses (1-2ps) by hibrid mode-locking of a laser diode with a fast saturable absorber. The wavelength could be changed in the range between 1.49mum and 1.54mum. The pulse width was shortened to 800fs using the fiber compression.

我们主要研究了以下四个主题来创建新型非线性光学功能器件。（1）半导体光放大器中的高度非简并四波混频我们证明了1.3-亚皮秒光脉冲之间的高度非简并四波混频（FWM）妈妈多量子阱 (MQW) 半导体光放大器 (SOA)。我们可以通过器件的电流脉冲泵浦直接测量输出频谱中的FWM信号。我们在小于 1 TH_z 的频率转换范围内实现了超过 10% 的高转换效率。 (2) 在 SOA 中使用 FWM 进行光学采样我们已经在 SOA 中演示了使用 FWM 过程的超快速光学采样。采样光分别作为探测光和泵浦光注入 SOA。我们可以测量采样波形作为 FWM 信号的包络。结果表明，对于 1 fJ 至 0.1 pJ 的输入能量，FWM 强度与输入探针能量之间存在良好的线性关系。 (3) 锁模激光二极管中多重脉冲形成的抑制我们提出了一种无需任何条件即可获得短光脉冲的新方法。来自主动锁模激光二极管的拖尾脉冲。输出的一部分以正交偏振反射回激光二极管。由激光二极管端面处的过量增益和残余反射引起的拖尾脉冲被极大地抑制。我们通过实验证明了使用 1.55mum In G_aA_sP 激光二极管可以减少由过量增益引起的拖尾脉冲。(4) 从锁模激光二极管生成亚皮秒光脉冲我们通过混合技术生成了短光脉冲 (1-2ps)具有快速可饱和吸收器的激光二极管的锁模。波长可在1.49mum和1.54mum之间改变。使用光纤压缩将脉冲宽度缩短至 800fs。