在充满的空心光子晶体纤维中刺激拉曼散射
F Benabid1, J C Knight, G Antonopoulos
1Optoelectronics Group, Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, UK. pysab@bath.ac.uk
Science (New York, N.Y.)
|October 12, 2002
概括
研究人员用气在一米长的空心纤维中实现了刺激的拉曼散射. 这一突破使得基于气体的非线性光学能够在显著较低的能量下实现,从而开辟了新的研究可能性.
科学领域:
- 非线性光学是非线性光学.
- 光纤光学是指光纤的使用.
- 激光物理 激光物理
背景情况:
- 刺激拉曼散射 (SRS) 是一种非线性光学过程.
- 空心光子晶体纤维 (HC-PCF) 为气相非线性光学提供了长的相互作用长度.
- 以前的SRS在气体中的实验需要高脉冲能量,限制了可访问性.
研究的目的:
- 为了在一个长达一米的HC-PCF中研究SRS,充满了气.
- 确定斯托克斯和反斯托克斯生成的能量值.
- 为了评估到斯托克斯的转换效率.
主要方法:
- 使用了一米长的HC-PCF,核心直径为15微米,被2D光子带隙所限制.
- 使用脉冲激光源 (持续时间 6 ns,波长 532 nm).
- 对斯托克斯和反斯托克斯生成的测量脉冲能量和到斯托克斯的转换效率.
主要成果:
- 观察到斯托克斯生成值低至800 +/- 200 nJ.
- 检测到一个反斯托克斯生成值在3.4 +/- 0.7μJ.
- 在4.5μJ脉冲能量下实现了30 +/- 3%的到斯托克斯转换效率.
结论:
- 在气体填充的HC-PCF中,在显著低于先前报告的脉冲能量下,证明了SRS.
- 这项工作降低了基于气体的非线性光学的能源需求,使新的高强度和长相互作用长度实验成为可能.
- 为气体的非线性光学研究打开以前无法访问的参数模式.
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