Generation of an ultimate ultrashort pulse and development of its applications

1.利用氢气中的高阶受激拉曼散射和相干反斯托克斯拉曼散射，研究了超短脉冲从近红外到深紫外光的频率转换。我们获得了足够的光谱范围，实现了极短脉冲的产生，获得了几个飞秒的持续时间。我们还成功地压缩了一个深达50-fs的紫外光脉冲，该脉冲的光谱通过拉曼活性介质中的非线性相互作用而展宽。2.我们证明了受激拉曼散射激发的分子的相干旋转运动调制了近紫外光超短脉冲的光谱展宽。我们还提出了一种利用两种类型的旋转拉曼相干来填充调制光谱凹陷的新方法。在对相位失真进行适当补偿后，得到了11fS的超短紫外光脉冲。3.我们研制了一种基于m…的超短紫外光脉冲测量系统多光子电离/质谱仪作为探测器。这使得我们能够成功地测量作为一氧化二氮和氙气作为电离源的深紫外飞秒脉冲。这为分析分子在极端超快时间区域的行为提供了可能。4.我们以紫外飞秒激光为光源，利用气相色谱/多光子电离/质谱仪对二恶英化合物进行了高灵敏的检测。这使得我们能够检测到五色二苯并呋喃，限量低于0.1pg.5。我们利用受激拉曼散射和相干反斯托克斯拉曼散射在多程拉曼池、中空光子带隙光纤和空心毛细管波导中高效地产生了三基色激光。我们研究了角形芯光子带隙光纤和绝望补偿高精细腔中受激拉曼散射和四波混频的连续波产生。在这种方法中，我们首先展示了相位匹配连续波四波混频和高效的反斯托克斯发射。较少

1.We demonstrated frequency conversion of ultrashort pulses from near infrared to deep ultraviolet by means of high-order stimulated Raman scattering and coherent anti-Stokes Raman scattering in hydrogen gas. We obtained sufficient spectral range to achieve the generation of ultimate ultrashort pulse with a few femtosecond duration. We also successfully compressed a sub-50-fs deep ultraviolet ultrashort pulse the spectrum of which was broadened through nonlinear interaction in Raman active medium.2.We demonstrated that spectral broadening of near ultraviolet ultrashort pulse modulated by coherent rotational motion of molecules excited by transient stimulated Raman scattering. We also proposed that new approach to fill the dip of modulated spectrum using two types of rotational Raman coherence. This provides an 11-fs ultrashort ultraviolet pulse after the appropriate compensation of phase distortion.3.We developed a novel system for measurement of ultrashort ultraviolet pulses using a m … More ultiphoton ionization/mass spectrometer as a detector. This enabled us to successfully measure a deep ultraviolet femtosecond pulse using as nitrogen monoxide and xenon an ionization source. This opens a possibility to analyze behaviors of molecules in extreme ultrafast time region.4.We demonstrated highly sensitive detection of dioxin compound by means of gas chromatography/multiphoton ionization/mass spectrometry using a light source as ultraviolet femtosecond laser. This enabled us to detect the pentachrorinated dibenzofurans with a limit below 0.1 pg.5. We generated efficiently three-primary-color laser arising from stimulated Raman scattering and coherent anti-Stokes Raman scattering in a multi-pass Raman cell and a hollow-core photonic bandgap fiber and hollow-core capillary waveguide using deuterium and methane as a medium.6. We investigated continuous-wave generation of stimulated Raman scattering and four-wave mixing in a horrow-core photonic bandgap fiber and despertion compensated high-finesse cavity. We first demonstrated phase-matched continuous-wave four-wave mixing and highly efficient generation of anti-Stokes emission in this approach. Less