Nonlinear Optics with Two-Colour Lasers

使用双色激光器的非线性光学

• 批准号: 194495-2013
• 负责人: Strickland, Donna
• 金额: $ 2.33万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=546142
• 关键词: Nonlinear; Optics; Two; Colour; Lasers

Lasers transformed optics research 50 years ago and have now spawned innumerable applications. Lasers operate at many wavelengths from the infrared to the ultraviolet, but to completely cover the optical spectrum, nonlinear optics is needed. Ultrashort pulse lasers can now generate far-infrared radiation through a nonlinear process known as optical rectification and can nonlinearly drive the frequency up to the extreme ultraviolet by high order harmonic generation. However, some spectral gaps still exist and this proposal aims to fill in the "molecular fingerpint" spectral region from 6 to 25µm, where almost every molecule has a distinctive signature in its absorption spectra. Along with applications in environmental monitoring and medical applications, this spectral region is becoming increasingly important for trace gas detection of explosives that have strong absorption lines at these wavelengths. At Waterloo, we are developing a two-colour, short pulse fiber laser system, which will generate mid-infrared wavelengths across the fingerprint region with sufficient power for trace gas detection, by difference frequency mixing the two laser outputs in a nonlinear crystal.

50年前，激光改变了光学研究，现在已经产生了无数的应用。激光工作在从红外到紫外的许多波长，但要完全覆盖光谱，非线性光学是必要的。超短脉冲激光器现在可以通过称为光整流的非线性过程产生远红外辐射，并且可以通过高次谐波产生非线性驱动频率到极紫外。然而，一些光谱空白仍然存在，本提案旨在填补6至25µm的“分子指品脱”光谱区域，在该区域，几乎每个分子在其吸收光谱中都有独特的特征。随着在环境监测和医疗应用中的应用，该光谱区域对于在这些波长具有强吸收线的爆炸物的痕量气体检测变得越来越重要。在滑铁卢大学，我们正在开发一种双色短脉冲光纤激光系统，通过在非线性晶体中混合两种激光输出的差频，该系统将在指纹区域产生中红外波长，具有足够的功率用于微量气体检测。