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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，以创建新的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在1.3 μ m的多量子阱半导体光放大器（SOA）中实现了亚皮秒光脉冲的高度非简并四波混频。通过对器件的电流脉冲抽运，可以直接测量输出光谱中的四波混频信号。在小于1 TH_z的频率转换范围内，我们获得了超过10%的高转换效率。(2)利用SOA中的四波混频过程实现了超快光采样。信号光和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四波混频信号的包络。结果表明，在1 fJ ~ 0.1 pJ的入射能量范围内，四波混频强度与入射探测能量呈良好的线性关系。(3)本文提出了一种从主动锁模半导体激光器中获得无尾脉冲的短光脉冲的新方法。一部分输出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大大抑制。我们实验证明，使用1.55 μ mIn G_aA_sP激光二极管的过度增益所造成的拖尾脉冲的减少。(4)用锁模半导体激光器产生亚皮秒光脉冲我们用半导体激光器与快饱和吸收体的混合锁模产生了1- 2 ps的短光脉冲。波长可以在1.49 μ m和1.54 μ m之间的范围内变化。利用光纤压缩技术，脉冲宽度缩短到800 fs。