溶胶-凝胶和聚合物固体激光染料的特性

采用溶胶-凝胶(sol-gel)和聚合物聚甲基丙烯酸甲酯(PMMA)为基质,Pyrromethene-567(PM567)为增益介质,调Q倍频Nd:YAG激光为抽运源,实现了宽带固体染料脉冲激光输出。溶胶-凝胶基质和聚合物基质输出谱线中心分别为560nm和561nm,半峰全宽(FWHM)分别为9nm和8nm;采用透过率为50%的输出镜,激光斜率效率分别为43%和26.3%,最高输出能量分别为13mJ和99mJ。     

4～5μm全固化可调谐激光实验研究

报道了采用KTP晶体和LiIO3晶体实现4~5μm可调谐激光输出的光参量振荡器(OPO)至差频产生器(DFG)的全固化结构和相应的实验结果。其中光参量振荡器的抽运源为倍频Nd∶YAG激光,差频产生器的抽运源分别是上述光参量振荡器激光和Nd∶YAG基频激光经KTP倍频晶体后剩余的1.064μm激光。实验中Nd∶YAG基频脉冲激光脉宽12 ns,单脉冲能量300 mJ。观察到最大倍频效率达到66.7%,KTP参量量子转换效率达到50%,差频量子转换效率为1.5%,在4.45μm得到了单脉冲100μJ的激光输出。差频光的调谐范围为4.1~4.5μm,发散角为垂直方向12 mrad,水平方向4 mrad。     

中红外高能量输出复合腔抽运光参量振荡器

报道了采用复合腔技术研究Nd:YAG激光抽运LiNbO₃晶体光参量振荡器(OPO)的实验研究结果。得到OPO输出单脉冲平均能量56.4mJ,闲频光(3097nm)脉冲平均能量22.8mJ,脉宽8ns,抽运光转换成参量光输出效率46%(重频1Hz～10Hz)。测得角度调谐的波长范围是:信频光1479nm～1621nm,闲频光3097nm～3793nm。     

深紫外固体激光系统

报道了一种利用非线性光学频率变换技术生成深紫外激光的固体激光系统.此系统采用基于CLBO晶体和频的频率变换方案,参与和频过程的两路激光分别是一台全固态声光调Q Nd:YVO;激光器输出的1064 nm近红外激光和一台灯抽运电光调Q倍频Nd:YAG激光器抽运的钛宝石激光器输出的三倍频238.7 nm紫外激光.对系统中的调Q倍频Nd:YAG激光器、钛宝石激光器、BBO三倍频模块、调Q Nd:YVO4激光器以及CLBO和频模块进行了详细描述.最后,在实验中获得了最高功率217 μW,重复频率10 Hz的195 nm深紫外激光输出.     

LD抽运免调试谐振腔被动调Q的固体激光器

将免调试谐振腔应用于二极管抽运固体激光器 ,采用Cr4 + ∶YAG晶体被动调Q ,准连续二极管侧向非均匀抽运Nd∶YAG激光棒 ,传导冷却 ,KTP腔外倍频 ,具有结构紧凑、抗失调能力强的特点。获得了远场近似平顶高斯分布的激光输出 ,输出波长 0 5 3μm ,能量 5 2 2mJ pulse ,稳定性 0 5 % ,电 光转换效率 3 4 % ,脉宽～ 6ns,重复频率 10～ 4 0Hz,发散角 2 8mrad。     

1319nm Nd:YAG脉冲电光调Q激光器的研究

为了研究脉冲输出波长为1319nm的Nd:YAG激光器,通过分析Nd:YAG激光介质的辐射跃迁能级,采用镀制高选择性介质膜的方法抑制1064nm等其它波长的起振,最终实现1319nm激光单脉冲输出。实验中采用闪光灯抽运、水冷Nd:YAG激光器,KD*P调Q,平平腔结构,获得1319nm激光静态输出能量340.9mJ,动态输出76.8mJ,重频1Hz,脉宽17ns,束散角2.7mrad。结果表明,通过镀制高选择性介质膜的方法可以实现1319nm激光调Q脉冲输出。     

激光二极管侧面抽运调Q倍频Nd∶YAG激光器

对高平均功率输出的激光二极管侧面抽运电光调Q倍频Nd∶YAG激光器进行了研究,当采用90个60W的脉冲激光二极管阵列抽运时,在重复频率为10Hz下,实现了最大平均 功率为1180mW的1064nm红外激光输出,光2光转换效率为11%。腔外倍频获得600mW 的 532nm绿光输出,倍频效率达到50%以上。     

二极管抽运200Hz TEM00模Q开关Nd:YAG激光器

用三只QCW-600W激光二极管侧面抽运Nd:YAG激光器,在重复频率为200Hz,单脉冲注入能量为270mJ条件下,实现了29.7mJ,TEM00模调Q激光输出,M2=1.12,脉宽6.4ns,光-光转换效率11%,斜效率16.5%,输出能量不稳定度1.14%.通过KTP晶体腔外倍频,获得了单脉冲能量16.8mJ,脉宽5.6ns的绿光输出,倍频效率56.6%.     

百纳秒脉宽单频大能量1064 nm激光器

报道了基于光纤-固体混合放大的百纳秒脉冲宽度单频大能量1064 nm激光光源的研究工作。采用1064 nm分布反馈(DFB)半导体激光器作为单频连续种子光光源,采用声光调制器将种子光整形为脉冲宽度约为149.0 ns的洛伦兹波形脉冲光,重复频率为60 Hz,经过级联的全保偏光纤放大器放大后,获得单脉冲能量约为2.1μJ、脉冲宽度约为216.7 ns的脉冲光输出。固体放大部分采用激光二极管(LD)端面抽运的Nd∶YVO₄晶体作为高增益的前放大器进行双程放大,采用LD单侧面抽运的Nd∶YAG板条晶体作为预放大器进行双程放大,采用两级LD双侧面抽运的Nd∶YAG板条晶体作为功率放大器,最终获得了单脉冲能量为151.4 mJ、脉冲宽度约为267.8 ns的激光输出。采用光学外差法对输出脉冲激光的线宽进行了测试,线宽约为14.2 MHz。研究结果为星载相干测风激光雷达采用1.06μm的激光光源提供了新的技术路线。     

160 W激光二极管抽运电光调Q主振荡功率放大器绿光激光器

介绍了激光二极管抽运的高重复频率、大能量绿光固体激光器研制成果。激光器采用电一光调Q，主振荡功率放大器（MOPA）结构。根据放大器的设计要求，研制了抽运功率达12kW，占空比为15％的激光二极管侧抽运Nd：YAG棒状激光模块。在重复频率500Hz，脉冲宽度15ns条件下，实现了单脉冲能量1．27J的1064nm输出，光束质量β小于2．5。采用Ⅱ类相位匹配KTP晶体外腔倍频，在基频能量1J，重复频率400Hz，抽运功率密度67MW／cm^2时，获得大于405mJ的绿光输出（平均功率达160W），倍频效率约为40％，绿光光束质量β〈5。     

Structural Changes in the BODIPY Dye PM567 Enhancing the Laser Action in Liquid and Solid Media

In the search for more efficient and photostable solid‐state dye lasers, newly synthesized analogs of the borondipyrromethene (BODIPY) dye PM567, bearing the polymerizable methacryloyloxypropyl group at position 2 (PMoMA) or at positions 2 and 6 (PDiMA), have been studied in the form of solid copolymers with methyl methacrylate (MMA). The parent dye PM567, as well as the model analogs bearing the acetoxypropyl group in the same positions, PMoAc and PDiAc, respectively, have been also studied both in liquid solvents and in solid poly(MMA) (PMMA) solution. Although in liquid solution PMoAc and PDiAc have the same photophysical properties as PM567, PDiAc exhibited a photostability up to 10 times higher than that of PM567 in ethanol under 310 nm‐irradiation. The possible stabilization factors of PDiAc have been analyzed and discussed on the basis of the redox potentials, the ability for singlet molecular oxygen [O₂(¹Δ_g)] generation, the reactivity with O₂(¹Δ_g), and quantum mechanical calculations. Both PMoAc and PDiAc, pumped transversally at 532 nm, lased in liquid solution with a high (up to 58 %), near solvent‐independent efficiency. This enhanced photostabilization has been also observed in solid polymeric and copolymeric media. While the solid solution of the model dye PDiAc in PMMA showed a lasing efficiency of 33 %, with a decrease in the laser output of ca. 50 % after 60 000 pump pulses (10 Hz repetition rate) in the same position of the sample, the solid copolymer with the double bonded chromophore, COP(PDiMA‐MMA), showed lasing efficiencies of up to 37 %, and no sign of degradation in the laser output after 100 000 similar pump pulses. Even under the more demanding repetition rate of 30 Hz, the laser emission from this material remained at 67 % of its initial laser output after 400 000 pump pulses, which is the highest laser photostability achieved to date for solid‐state lasers based on organic polymeric materials doped with laser dyes. This result indicates that the double covalent linkage of the BODIPY chromophore to a PMMA polymeric matrix is even more efficient than the simple linkage, for its photostabilization under laser operation.     

Properties of two-photon pumped cavity lasing in novel dye dopedsolid matrices

Two-photon pumped frequency upconversion cavity lasing at ~600 nm is accomplished in three types of dye-doped solid rods pumped with ~10 ns and 1.06-μm IR laser pulses. The dopant is a new dye, trans-4-[p-(N-ethyl-N-(hydroxyethyl)amino)styryl]-N-methylpyridinium tetraphenylborate, abbreviated as ASPT, which possesses a greater two-photon absorption cross section and stronger upconversion fluorescence emission than common commercial dyes (such as rhodamine). Three different materials were chosen as solid matrices: poly(2-hydroxyethyl methacrylate), VYCOR porous glass, and sol-gel glass. Using a Q-switched Nd:YAG pulse laser as the pump source, strong cavity lasing could be achieved in these three ASPT doped solid rods as well as in ASPT solution in a liquid cell. The spectral, temporal, and spatial characteristics of the cavity lasing output have been systematically investigated. The measured output-input characteristics, lasing lifetime, and damage threshold for the three different rods are presented     

一种主被动激光雷达系统设计及应用

为综合利用激光雷达的光学接收天线,设计了一种可工作于主动状态和被动状态的光学遥感测量系统。处于主动状态时,主振荡激光器辐射1 064 nm 的激光脉冲,经倍频输出523 nm 激光,泵浦罗丹明染料,实现调谐脉冲输出,脉冲最高频率10 Hz,脉冲宽度为3. 0 ns,染料激光器输出脉冲能量可达105 mJ,主振荡输出激光脉冲可达1. 08 J。处于被动状态时,利用大气透过的太阳光谱,选取2 个波长的光谱线,采用比例光谱技术,根据激光雷达光学天线接收的太阳光谱强度,反演大气中反应性气体的柱浓度,再计算体积浓度。系统用于测量SO2 和O3 ,应用结果表明此系统的测量数据与国家相关测量平台数据非常吻合。     

高功率脉冲染料激光振荡-放大器

报道一种用倍频Nd:YAG激光纵向泵浦、双棱镜一维扩束的染料激光系统,经过二级放大,输出总效率达31%.当泵浦光为40 mJ时,得到12.2mJ、 2MW,线宽为0.18(?)的可调谐染料激光输出,重复率可达10次/秒.     

高分子基体的固体染料激光器的制备和研究

制备了用于固体染料激光器的高分子共聚物基体 ,研究了两种激光染料 Rhodamine- B(Rh-B)和 Pyrromethene597(PM- 597)在高分子基质中的光谱性质。以调 Q的 Nd:YAG激光器的倍频光为抽运光源 ,在无外加谐振腔的条件下 Rh- B和 PM- 597掺杂的高分子基体中获得了高转换效率和大能量激光输出 ,可为固体染料激光器的实用化提供关键工作物质     

中红外砷酸钛氧钾光参变振荡器的实验研究

为了得到高能量中红外激光输出,对电光调Q灯抽运1064nm Nd:YAG抽运复合腔砷酸钛氧钾(KTA)光学参变振荡器(OPO)作了实验研究,在工作频率1Hz时得到OPO输出单脉冲能量6mJ,信号光脉宽10ns,闲频光波长407nm,能量11mJ.在5Hz～40Hz范围单脉冲能量随重复频率增高而降低.实验中采用的复合腔抽运技术有利于提高转换效率,降低起振阈值.使用上述光源对中红外成像器件作实验,在成像系统监视器上观察到激光光斑.这一结果对中红外激光器的研究是有帮助的.     

Synthetic Strategies for Hybrid Materials to Improve Properties for Optoelectronic Applications

We report, for the first time to the best of our knowledge, a systematic study to relate the laser action from BODIPY dyes, doped into monolithic hybrid matrices, with the synthetic protocols of the final materials prepared via sol‐gel. To this aim, the influence of both the hydrolysis time, increased in a controlled way, and the nature of the neutralization agent (pyridine, 3‐amino‐propyltriethoxy‐silane (APS), N‐[3‐(trimethoxysilyl)propyl]‐ethylene diamine (TSPDA), and N¹‐[3‐(trimethoxysilyl)propyl]‐ diethylene triamine (TSPTA) on the laser action of PM567, incorporated into hybrid matrices based on copolymers of methyl methacrylate (MMA) and 2‐hydroxyethyl methacrylate (HEMA), with methyltriethoxysilane (TRIEOS) as inorganic precursor, was analyzed. The presence of the amine‐modified silane TSPDA as neutralization agent, which is able at the same time to be anchored to the inorganic network enhancing the inorganic‐organic compatibility through the matrix interphase, and utilization of hydrolysis times lower than 10 minutes, increased significantly the lasing efficiency and photostability of dye. The extension of this study to the laser behavior of BODIPY dyes embedded in other different hybrid materials based on hydrolyzed‐condensed copolymers of MMA with 3‐(trimethoxysilyl)propyl methacrylate (TMSPMA) in a 1/1 volumetric proportion, validates the generalization of the above conclusions, which provide guides for the optimization of the synthesis of organic‐inorganic hybrid materials with optoelectronic innovative applications independently of their composition.     

输出5 W的电光调Q Nd:YAG陶瓷激光器

研究了激光二极管(LD)侧向抽运的Nd:YAG陶瓷电光调Q激光器的激光输出特性.该激光器采用九组激光二极管线阵列(LDA)侧面紧密环绕均匀排布的抽运结构,并用微通道热汇冷却技术冷却.在电光调Q方式下,重复频率为100 Hz,抽运单脉冲能量为416 mJ时,用尺寸为φ5 mm×75 mm,掺杂原子数分数为1%的Nd:YAG陶瓷棒,获得50 mJ的1064 nm激光输出,脉冲宽度为12 ns,斜率效率达24%.并实验测量和分析了偏振片,KD*P晶体,四分之一波片等调Q器件的插入损耗.测量了输出激光时间波形和光斑的光强空间分布.     

Sixteen new IR laser dyes

Sixteen new IR laser dyes are reported. All lased successfully under excitation from a simple linear flashlamp of about 700-ns rise time. Untuned lasing wavelengths ranged from 810 to 972 nm. Laser output pulse energies from the four best of these dyes were 5-15 times greater than from diethylthiatricarbocyanine iodide (DTTC), with peak output of about 50 mJ obtained from 128-J excitation. Solvent effects with four selected laser dyes are also discussed.     

LD侧面抽运的铒玻璃激光器

铒玻璃激光器可以直接输出1.54μm人眼安全激光,主要应用在激光测距。报道了LD侧面抽运的Er+3,Yb+3共掺磷酸盐玻璃激光器的运转。实现了自由振荡输出60mJ;在0.5Hz重复频率下,稳定输出50m J/脉冲,波长1.54μm。实验表明,抽运的对称性和均匀性是设计铒玻璃激光器的关键。