量子级联激光器的自动锁定模式具有巨大的超快光学非线性
R Paiella1, F Capasso, C Gmachl
1Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974, USA. robertop@lucent.com
Science (New York, N.Y.)
|January 11, 2000
概括
研究人员从中红外量子级联激光器产生了超短脉冲. 这一进步利用半导体纳米结构中的非线性光学特性,在分子指纹区域中增强脉冲生成.
科学领域:
- 光学和光子学 在光学和光子学.
- 半导体物理 半导体物理
- 量子电子学 量子电子学
背景情况:
- 量子级联激光器 (QCL) 是半导体设备,在中红外线发射.
- 这些激光器利用纳米结构中的子带间电子过渡.
- 中红外波长对于分子光谱学 (分子指纹区域) 是至关重要的.
研究的目的:
- 从中红外量子级联激光器产生皮秒自我模式锁定脉冲.
- 研究光学非线性在脉冲生成中的作用.
- 探索分子指纹区域中的应用.
主要方法:
- 使用具有较大的光学非线性和皮秒放松寿命的半导体纳米结构.
- 在量子级联激光器中实现自行模式锁定.
- 使用理论模型来解释实验结果.
主要成果:
- 成功生成了皮秒自动模式锁定脉冲.
- 在分子指纹区域内的波长观察到脉冲生成.
- 证明了依赖强度的折射率会产生非线性波导,在强度增加时减少光学损失.
结论:
- 非线性波导效应增强了超短脉冲的产生.
- 从中红外 QCL 产生皮秒脉冲是可行的.
- 这些发现为先进的光谱应用开辟了道路.
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