同步泵浦腔内倍频飞秒KTP光参量振荡器

采用光谱物理公司生产的，平均输出工为１．１Ｗ，脉宽为９０ｆｓ的再生锁模掺钛蓝宝石（Ｔｉ：Ｓａｐｐｈｉｒｅ）激光器作为泵浦源，ＫＴＰ作为非线性光学介质，以及ＢＢＯ作为腔内倍频晶体，制成了一台同上泵浦腔内倍频飞秒ＫＴＰ光学参量振荡器，其输出调谐范围５２８ｎｍ至５８６ｎｍ，最佳平均输出功率为２４０ｍＷ左右，脉宽约为１００ｆｓ。在无反馈伺服系统的情况下，该参量振荡器可维持振荡达三个小时。     

Effects of the Solvent Refractive Index and Its Dispersion on the Radiative Decay Rate and Extinction Coefficient of a Fluorescent Solute

It is well known that the probabilities of radiative transitions in a medium differ from those in vacuum. Excitation of a fluorescent molecule and its radiative decay are examples of radiative transitions. The rates of these processes in solution depend on the optical characteristics of the solvent. In this article the radiative decay rate and the extinction coefficient of a fluorescent molecule in solution are expressed in terms of the intrinsic properties of the fluorescent molecule (electronic transition moments) and the optical characteristics of the solvent (refractive index, group velocity of light). It is shown that the group velocity does not enter in the final expressions for the radiative decay rate and the extinction coefficient; this means that the dispersion of the refractive index has no effect on these quantities. The expressions for both the radiative decay rate and the extinction coefficient contain the refractive index of the solvent and the local field correction factor. The latter depends on the cavity model, and, for some cavity models, on the shape of the cavity. Four types of cavity models are discussed; for each model the limits of applicability are examined. Experimental evidence in support of specific cavity models is reviewed.     

Performance Characteristics of Power Build-Up Cavity for Raman Spectroscopic Measurement

Performance characteristics of power build-up cavity (PBC) as the light source of a Raman spectroscopy based gas sensor were studied. The key parameter to optimize stable and high intra-cavity power operation was beam diameter of the back reflected beam from external cavity to diode laser. The optimum diameter determined by an appropriate distance between the cavity and diode laser was found to be comparable with the waveguide cross section of diode laser for the effective spatial filtering, where inevitable cavity coupling loss caused by slight spatial mode mismatching existed. A PBC with a finesse of ∼10300 achieved a stable TEM₀₀ mode in excess of intra-cavity power of 80 watts pumped by a 10 milliwatts diode laser. Simultaneously, the PBC wavelength is found to be passively locked effectively at 670 +/− 0.15 nm where the center of the gain region exists. A Raman spectrum of nitrogen measurement was demonstrated.     

A High Efficiency Yb3+-doped Fiber Ring Cavity Laser with Narrow Line-width

A novel Yb3+-doped fiber ring cavity laser pumped by a 977 nm laser diode is presented with its output laser wavelength of 1060 nm. Based on a fiber Bragg grating (FBG), the laser exhibits 0.20 nm line-width, 7.5 mW laser output power, 40 dB signal-to-noise ratio (SNR) and 66% slope efficiency.     

Measurement of Thermal Lens Focal Length and Its Effect on Laser Output Characteristics in LD End-pumped Nd∶YVO_4 Lasers

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非线性波导腔耦合特性研究

对一种非线性波导耦合腔进行了理论和实验研究。研究表明,该系统的透过率随入射光强变化。对于不同的初始偏置、耦合区长度和入射功率系统具有微分放大、限幅、反常耦合和双稳运行等不同的响应。     

球体谐振腔(Ⅱ)——球体腔中的喇曼振荡

本文对球体谐振腔与法布里-珀罗腔作了比较。详细讨论了球体腔中产生的喇曼振荡、振荡输出谱及场分布等特性。从水滴及酒精液滴的实验结果分析了输出共振和输入共振,对实验中还观察到的液滴中的高阶斯托克斯振荡和组合斯托克斯振荡作了讨论。     

Cavity Field Spectra of the Intensity-Dependent Two-Mode Jaynes–Cummings Model

The cavity field spectrum of a two-level atom interacting with two modes of the radiation field through intensity-dependent coupling in an ideal cavity is investigated. The results for the initial fields in pure number states, coherent states, and squeezed vacuum states are calculated. We find that the frequency of one mode is tuned by the intensity of the other mode when the two modes are both in pure number states or coherent states. A complicated multipeak structure appears when both field modes are in a superposition of number states initially.     

改造测量数据确定空洞位置的数学模型

对所给测量数据加以改造 ,使弹性波的测量长度相同 ,找出了空洞的位置及洞径     

用光腔衰荡光谱法判断钕玻璃体损伤的产生

运用光腔衰荡光谱技术测量钕玻璃在激光辐照下其透过率的变化,判断出钕玻璃体损伤的产生。实验采用直腔型衰荡光腔,通过检测钕玻璃在强激光辐照下产生应力时其透过率的变化,测试出了钕玻璃在强激光辐照下产生体损伤的激光能量密度。该测试方法灵敏度高,且对测试元件无破坏作用。