激光二极管泵浦的Nd：YVO4单频绿光激光器

对激光二极管泵浦单频连续运行的Ｎｄ：ＹＶＯ４腔内倍频激光器进行了理论和实验研究，通过精密调控Ｎｄ：ＹＶＯ４，ＫＴＰ及泵浦泵温度以达到有关参数的最佳匹配，从而获得了较稳定的单横模，单纵模，单偏振的绿光输出，实测最大单频录光功率为７．５ｍＷ，此时会聚磁浦光功率约为４３０ｍＷ，已超过阈值泵浦功率１３倍以上。     

猫眼腔激光器的横模变换与频率分裂

为了产生多种激光横模,以前的系统相对比较复杂,而且一般只能产生基横模和低阶横模,很难产生高阶横模,同时也很难观察到模竞争中一个频率抑制另一个频率的变化过程。基于猫眼谐振腔激光器和频率分裂技术,提出了一种新型的激光原理综合实验系统。该系统利用猫眼逆向器作为He-Ne激光器的一个腔镜,通过调节猫眼逆向器中两镜片间距可输出包括基横模、低阶横模、高阶横模在内的十余种典型横模,并可完成纵模、偏振、出光带宽等多种激光基本特性的实验。同时在基横模状态下,利用谐振腔内加入的石英晶体片可实现激光频率分裂及其频差调节。在此基础上又可实现完整的模竞争过程的观察。     

输出功率12W的全固态连续单横模1.34μm激光器

设计了全固态连续单横模1.34μm激光器。利用880nm激光二极管双端纵向泵浦Nd:YVO4复合晶体,在泵浦功率为51W时,获得12.4W的连续单横模1.34μm激光输出,光-光转换效率达到24.3%,激光器长期功率稳定性优于±1.2%(3h)。     

LD泵浦的Nd：YAG微片激光器实验研究

详细讨论了激光二极管泵浦的Ｎｄ：ＹＡＧ微片激光器输出的纵，横模特性，当泵浦功率小于７４０ｍＷ时，输出为单纵模，基横模，线宽达到仪器分辨极限２５ＭＨｚ。     

激光二极管端面抽运室温Tm,Ho:YLF连续固体激光器

报道了激光二极管端面抽运Tm，Ho：YLF固体激光器的输出特性.室温下，选用不同透过率的输出耦合镜进行了实验研究，确定了最佳输出耦合镜透过率为2%. 利用小孔扫描的方法，得到了激光远场的光强分布，证明激光为基横模输出，并且给出了热焦距随抽运功率的变化关系.通过在激光谐振腔内插入两个固体Fabry-Perot标准具的方法，获得了2μm激光的单频输出，阈值功率为250mW，在抽运功率为2.8W时，单频输出功率为118mW.此单频激光器可用作激光振荡器和激光放大器的种子源. 关键词： 激光光学 激光二极管 Tm Ho:YLF固体激光器 单频     

提高X光激光相干性的镶嵌靶的研究

 在以锗等离子体为增益介质的X光激光实验研究中，使用铜锗镶嵌靶可以获得一维横向宽度很窄的柱状等离子体，这有利于X光激光的单横模输出。本文对铜锗镶嵌靶进行了实验研究。     

几种新型全反射棱镜式环形激光器的模式选择技术

根据全反射棱镜式环形激光器(TRPRL)的矩阵光学理论和环形He-Ne激光器内环形激光的工作理论,研究了TRPRL的激光模式选择技术方法,可令环形激光器内的顺时针和逆时针两个方向上的激光工作在单谱线、单横模、单纵模的状态,从而在环形激光器内形成稳定的驻波,输出到光电探测器上稳定的干涉条纹信号波形。采用缩短TRPRL的毛细管直径方法,可抑制3.39μm谱线;由于TRPRL的特殊的环形激光器结构,采用分立式特殊结构设计的选频光阑,选频光阑可以放到环形激光器的光路任意位置处,而多个选频光阑即可有效抑制1.15μm的谱线;根据不同波长激光腰斑半径的不同,在光腰处采用特制的椭圆小孔光阑,抑制0.63μm激光的高阶横模。对于TRPRL在全反射棱镜式激光陀螺(TRPLG)中的应用具有重要意义。     

激光二极管泵浦固体激光器(DPSSL)应用技术的研究

本文报导了ＤＰＳＳＬ的两项应用：多种横模产生器与激光膜片反射率分布测量装置。前者可稳定地产生ＴＥＭ００至ＴＥＭ２９０各阶单横模输出,各阶模式分布与理论分布非常接近;后者可方便地测量反射率非均匀分布的激光膜片,并有较高的测量精度。     

波导自由电子激光振荡器的三维数值模拟

 建立了带波导的自由电子激光振荡器方程组，能够描述光场衍射、孔耦合输出以及电子运动、腔镜倾斜等三维问题。采用整体数值（INEX）模拟方法，研究了中国工程物理研究院（CAEP）远红外自由电子激光装置的三维问题与横模结构。结果表明：激光器的横模品质好，孔耦合输出方式下仍然是基模为主，在腔功率中所占份额约87%。研究了电子束偏入射、斜入射、腔镜倾斜等不同轴（misalignment）因素对激光器的增益、功率、输出、横模结构等的影响，并给出了最大允许值。     

亚纳秒重频脉冲信号源设计与实验

亚纳秒前沿、数百伏幅度、近似高斯单周波的重频窄脉冲信号源在超宽带探测、电磁兼容测试等领域有着十分广泛的应用。设计了一种全固态Marx电路结构型重频脉冲信号源,选用云母电容、雪崩三极管、贴片电阻、电感等元器件,根据信号输出要求优化印制电路板（PCB）布局及微带线结构,调整匹配电路元件参数,在50Ω电阻负载上获得了脉冲峰值约1 kV、脉宽约650 ps、前沿约450 ps、后沿约700 ps的单极性负脉冲信号,脉冲波形前后沿相似且光滑陡峭,实现了10 kHz重频输出,波形峰值抖动和半高宽抖动均小于10%。     

Evaluation of probe lasers employed in optical diagnostics for phase transformation of thin films during excimer laser crystallization

The stability and reliability of probe laser is an important factor affecting the inspection of the phase transformation process of Si thin films during excimer laser crystallization using in-situ time-resolved optical measurements. The changes in 2D intensity profile, peak power density, and beam wander of the commonly used helium–neon (He–Ne) and diode laser are investigated experimentally. It is found that the peak power density of He–Ne laser is higher than that of diode laser, while the total power of He–Ne laser is lower than that of diode laser. Although the instability in the peak power density of He–Ne laser will increase with increasing the operation time, the beam stability of He–Ne laser is better than that of diode laser. For long-time operation (>24 h) of optical measurements, the diode laser is a good candidate of probe laser. Conversely, the diode laser is suitable for the short-time operation (<24 h) of optical measurements because the beam-wander is higher than that of He–Ne laser.     

Structure and properties of laser quenched 4Cr13 steel

The structure and properties of laser quenched 4Cr13 steel were reported. The results show that: (1) Fine martensite is obtained after laser quenching. The highest content of retained austenite in the surface area 10 μm thick of laser hardened zone is 47. 13 percent, but only 3.6 percent of retained austenite is measured inside the laser hardened layer after the surface layer 10μm thick is worn off. (2) The hardness of laser quenched layer is much higher (HV_(0.1) 690) than that of the substrate (HV_(0.1) 237). (3) The wear resistance of laser quenched layer is 3.3 times higher than that of traditionally treated specimen and the corrosion resistance of 4Cr13 steel is also improved greatly by laser quenching.     

激光二极管纵向抽运（Tm，Ho）：YLF激光器的研究

对激光二极管端面抽运(Tm，Ho)：YLF固体激光器的激光特性进行了研究。根据激光二极管抽运准三能级系统的特性，详尽地分析了能量在Tm^3 离子和Ho^3 离子之间的传递过程，给出了(Tm，Ho)：YLF激光器准三能级的速率方程，对上转换及激光下能级粒子再吸收对激光二极管抽运(Tm，Ho)：YLF激光器运转的影响进行了理论分析，得出了(Tm，Ho)：YLF激光器的阈值抽运功率和斜率效率的解析表达式。同时对(Tm，Ho)：YLF微片激光器的激光特性进行了实验研究，当保持晶体温度为19℃时，阈值抽运功率为425mW，斜率效率为22．5％，最大光—光转换效率为17．4％，并且在将晶体保持在四个不同的温度下，给出了激光输出功率随抽运功率变化的实验结果。将理论与实验结果进行比较，发现吻合得比较好。     

管状预电离可调谐TEA CO2激光器.

研制了一种新型的预电离结构--管状预电离器,并将其应用于可调谐TEA CO2激光器.利用光栅选线方案,采用光栅谐振腔,实现了激光的调谐输出.在输出耦合率为50%、气压为40 kPa的条件下,10P(20),10R(20),9P(20),9R(20)四条谱线获得的最高电光转换效率,分别为9.5%,9.7%,9.8%,9....     

A high-power electro-absorption modulated 2d-array laser source for FM/cw scannerless lidar

A scannerless amplitude-modulated (AM) semiconductor lidar (or laser radar) using frequency-modulation continuous wave ranging (FM/cw) techniques is one of the most promising research directions at present. In this lidar system, the high-power AM laser source is a key component of the lidar transmitter. First of all, we present here the architecture of an FM/cw scannerless AM ladar and summarize and analyze various schemes of high-power laser modulation. Then we put forward a new method for obtaining a high-power AM laser output, that is, to compose a two-dimensional (2D) array light source with laser diodes (LDs) and electro-absorption modulation modules (EAMs). Finally, the optical properties of electro-absorption modulated laser arrays are briefly analyzed. The analysis shows that the modulated laser arrays have the features of integration and miniaturization and can realize incoherent light illumination in the far field. This laser array is potentially a more ideal high-power AM laser source applied to an FM/cw scannerless imaging lidar.     

重复频率激光辐照涂层金属材料的温升

 测量了重复频率YAG激光辐照涂层金属材料(30CrMnSiA钢和LF6M铝金壳体)的前后表面温度, 分析了不同频率激光辐照涂层壳体材料的温升特性。实验结果表明:在相同平均功率的条件下, 激光脉冲频率越高, 对材料的加热效率越明显, 重复频率激光对材料的加热优于连续激光。     

基于法布里-珀罗调谐滤波器的傅里叶域锁模扫频激光光源

报道了一个光纤型1300 nm波段的傅里叶域锁模(Fourier domain mode locking, FDML)扫频激光光源, 用于扫频光学相干层析成像技术 (optical coherence tomography, OCT) 成像. 本实验扫频激光光源采用包含增益介质、调谐滤波器和延迟线组成的长腔激光谐振腔以及光功率增强单元. FDML扫频激光光源具有快速和高度稳定运转模式, 相位稳定性好. 基于法布里-珀罗调谐滤波器(fiber Fabry-Perot tunable filter, FFP-TF)的FDML扫频激光光源扫频范围为130 nm, 半高全宽为70 nm, 输出平均功率是11 mW. 与基于FFP-TF的短腔的扫频光源做了对比研究, FDML扫频光源速度从短腔的8 kHz提高到了48.12 kHz, 对应生物组织OCT成像轴向分辨率为7.8 μm, 比短腔的减小了1.9 μm. 关键词： 光学相干层析技术 扫频激光光源 傅里叶域锁模 法布里-珀罗调谐滤波器     

Laser dye mixtures

Properties necessary to obtain efficient laser action from laser dyes are reviewed. It is concluded that the dye added (booster dye) to a laser dye (active dye) solution to increase its efficiency need not necessarily be a laser dye. This is illustrated by considering different spectral locations of a triplet-triplet absorption band present in the booster dye relative to the location of the laser action region (part of the fluorescence spectrum) of the active laser dye. Conditions required for booster dyes to form efficient dye mixtures are given. These observations are used to explain why specific well known laser dye mixtures show efficient, little, or no laser action at all.     

神光-Ⅱ装置三倍频实验中靶场单元技术的改进

 主要介绍为了满足神光-Ⅱ高功率激光装置三倍频光（351nm，3ω）的物理实验要求，靶场三倍频模拟光源和瞄准监视系统两个主要单元技术的改进，即三倍频模拟光源由基频光（1 053nm，3ω）通过腔外的KTP+BBO晶体倍频获得，再经八路分光系统和主激光耦合；瞄准监视系统由透射式光学系统改进为反射式光学系统，避免原系统存在较大的色差，提高瞄准精度。     

Continuous-wave rotational Raman laser in H(2)

A diode-pumped, far-off-resonance cw Raman laser in H(2) with rotational Stokes emission is reported for the first time to our knowledge. The Raman laser can produce single-wavelength emission at either 830 nm (rotational Stokes) or 1180 nm (vibrational Stokes) depending on the frequency tuning of the pump laser. The mirrors for the rotational cw Raman laser are easier to produce; the laser also exhibits a wider continuous tuning range and is less sensitive to thermal effects than the previously studied vibrational Raman laser [Opt. Lett. 26, 426 (2001) and references therein].