1975年IEEE/OSA激光工程和应用会议报告目录选辑

一、染料激光器:1.利用Nd:YAG激光泵浦的一种同步锁模染料激光器的非线性混合,放大和微微秒脉冲产生2.横向流动闪光灯泵浦染料激光器3.高功率染料激光器二、一般应用:1.利用光合成和塑料闪烁器的微微秒脉冲研究条纹相机2.高速辐射相机,利用一种脉冲横向模红宝石激光器和水合电子吸收现象3.激光手术应用4.可调激光器-生物学探头     

近红外波段激光调Q染料的结构与性质分析

在相当长的时间里,激光器调 Q 都是用电光或转镜 Q 开关.1965年,开始研究利用可饱和性染料的非线性吸收特性在激光器内实现 Q突变.相继合成出供红宝石激光器使用的花青类染料、钕激光器使用的碳花青染料和(口恶)英鎓盐类染料,它们的共同缺点是工作寿命太短.1980年,我们鉴定了 BDN 染料[双(4-二甲氨基苯-苯乙二硫酮)-镍]染料片,为我国 Nd~(3+):YAG 激光测距仪提供了关键元件。BND 染料的最大优点是光化稳定性好,工作寿命长。     

塑料激光介质的激光特性研究

染料激光器是目前众多激光器中最常用的一种,这与染料作为激光介质本身的优点分不开。它既可以宽频带工作,又可通过附加选频元件,制成波长可调谐激光器。但通常染料激光器都是将染料溶于某种有机溶剂:如甲醇、乙醇等,循环附带系统庞杂。为了简化装置,使器件小型化,携带方便,便于车载、机载,我们试验制作全塑激光器。为此我们试验研制了塑料激光介质,制备了接R—640,掺不同浓度的R—6G激光染料的单掺杂塑     

新型吡哺类激光染料的研究

本文报道新近合成的蓝-绿波段的10个激光染料,测定了这些染料的光谱数据,并用YAG激光器或N_2激光器作泵浦源,研究了它们的激光特性.     

固体激光与铜蒸气激光混合抽运的染料激光放大实验

采用倍频Nd:YAG绿光激光器与铜蒸气激光器混合抽运双级染料激光放大器的实验方法,通过抽运激光器精确的脉冲同步控制和匹配技术,获得了9.0W的染料激光输出,第二级染料激光放大器对抽运激光的提取效率达到了26.6%,系统总提取效率达到了13.6%.实验研究了染料激光输出功率和抽运激光提取效率随染料激光波长的变化关系.     

连续倍频Nd:YAG激光抽运获得微微秒染料激光脉冲

用倍频连续锁模 Nd:YAG 激光器同步抽运若丹明6G 染料激光器,得到了微微秒脉冲。采用温度稳定的铌酸钡钠(Ba_2NaNb_5O_(15))作为 YAG 激光腔外的倍频晶体。脉宽与锁模效率或染料和 YAG 激光腔长匹配以及 Nd:YAG 激光器的振幅稳定性有关。现在同步抽运染料激光器技术的主要优点是特别适于短脉冲放大。     

倍频固体激光抽运双级染料激光放大系统的实验

报道了用倍频Nd∶YAG绿光激光器抽运双级染料激光放大系统的实验过程。实验应用两台高平均输出功率、高脉冲重复频率的倍频Nd∶YAG绿光激光器,通过精确的脉冲同步控制技术,实现了对双级染料激光放大系统的抽运,获得了放大级最高提取效率16. 8% ,总提取效率10. 6% ,最高输出功率9. 2W的实验结果。得到了抽运激光提取效率随染料激光波长、染料溶液浓度和抽运激光峰值功率的变化关系。     

蓝-绿新激光染料J系列的光谱和激光性能

一、引言 蓝-绿染料激光器是海洋通讯、摄影和测绘等的有力工具,在军事上获得重要应用;寻找这个波段的性能优良的激光染料工作就显得很有意义。这里介绍的五种4-甲基-7烃基酰氧基香豆素(J系列)激光染料可以作为这个波段激光染料的候选者。     

掺杂PM597的聚合物固体染料激光特性研究

固态染料激光器结构紧凑、应用简便、无污染、成本低,是目前染料激光器的一个发展方向.PM597是一种高效的激光染料,实验制备了掺杂不同浓度的PM597的聚合物基质的固体染料,并对其荧光光谱、激光光谱和斜率效率进行研究.固体染料具有宽带的荧光特性,荧光谱的带宽约为60 nm;激光光谱半宽约为10 nm,激光光谱的峰值波长随染料浓度的增加而发生相应的红移;PM597的浓度存在一个最佳值(2×10-4 mol/L),使介质的斜率效率达到最高,斜率效率高达50.9%.     

激光应用概况

关于激光振荡器,现在研究得较为厉害的是提高CO2激光器的输出功率、波长可调的染料激光器、紫外激光器等。但是实用上最重要的是能长时闾地保持稳定的工作,在工业上最大的课题是提高可靠性。     

新型分步合成法制备的P567固态染料可调谐激光器

采用分步合成方法制备激光染料P567掺杂有机改性凝胶玻璃。利用调QNd:YAG激光器倍频光(532nm)纵向泵浦固态染料,通过光栅调谐,得到了调谐范围超过30nm(553nm～585nm)、最高斜效率9.7%的线偏振激光输出。输出波长为574nm时,脉宽为4ns,线宽0.014nm。实验中还获得了7nm(FWHM)的宽带激光输出,斜效率为69%。在2Hz,0.1J/cm2的532nm激光泵浦下,38000个脉冲后,输出能量降到初始输出的50%。     

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.     

Dye‐Doped Polyhedral Oligomeric Silsesquioxane (POSS)‐Modified Polymeric Matrices for Highly Efficient and Photostable Solid‐State Lasers

Here, the design, synthesis, and characterization of laser nanomaterials based on dye‐doped methyl methacrylate (MMA) crosslinked with octa(propyl‐methacrylate) polyhedral oligomeric silsesquioxane (8MMAPOSS) is reported in relation to their composition and structure. The influence of the silicon content on the laser action of the dye pyrromethene 567 (PM567) is analyzed in a systematic way by increasing the weight proportion of POSS from 1 to 50%. The influence of the inorganic network structure is studied by replacing the 8MMAPOSS comonomer by both the monofunctionalized heptaisobutyl‐methacryl‐POSS (1MMAPOSS), which defines the nanostructured linear network with the POSS cages appearing as pendant groups of the polymeric chains, and also by a new 8‐hydrogenated POSS incorporated as additive to the polymeric matrices. The new materials exhibit enhanced thermal, optical, and mechanical properties with respect to the pure organic polymers. The organization of the molecular units in these nanomaterials is studied through a structural analysis by solid‐state NMR. The domain size of the dispersed phase assures a homogeneous distribution of POSS into the polymer, thus, a continuous phase corresponding to the organic matrix incorporates these nanometer‐sized POSS crosslinkers at a molecular level, in agreement with the transparency of the samples. The silicon–oxygen core framework has to be covalently bonded into the polymer backbone instead of being a simple additive and both the silica content and crosslinked degree exhibit a critical influence on the laser action.     

若丹明6G乙醇溶液中566nm泵浦的高效可调谐激光输出

报道了使用 5 66nm波长的染料激光激发高浓度的若丹明 6G(R6G)乙醇溶液得到波长在 5 72nm -610nm的可调谐染料激光输出 ,光束发散角为 5mrad ,能量转换效率达到 10 %。比较了使用Nd :YAG激光倍频光 ( 5 3 2nm)与 5 66nm染料激光激励R6G乙醇溶液的不同结果。讨论了染料激光浓度调谐机理 ,并从染料溶液的吸收谱及激发谱讨论了染料溶液抽运光波长的选择。     

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。     

Low-threshold dye laser pumped by visible laser diodes

The author describes a continuous-wave (CW) dye laser has been pumped by laser diodes for the first time. Two 10-mW visible laser diodes were polarization-combined to pump a rhodamine 700 dye jet laser. The absorbed pump threshold power was 5.6 mW, and 0.28 mW of output power was produced at 758 nm. The resonator was scalable and generated over 360 mW with a slope efficiency of 57% when pumped with a DCM dye laser at 660 nm     

Nd：GdCOB晶体1331.0nm自倍频特性

计算了Nd:GdCOB晶体的相位匹配角。用Datachroom-5000染料脉冲激光作为泵浦源,在Nd:GdCOB晶体中实现了由1331.0nm到665.5nm的自倍频激光运转,阈值能量为14.2mJ;当泵浦能量为25mJ时,665.5nm激光的输出能量为0.62mJ,相应的转换效率为2.5%。     

Nd∶GdCOB晶体1331.0nm自倍频特性

计算了Nd∶GdCOB晶体的相位匹配角.用Datachroom-5000染料脉冲激光作为泵浦源,在Nd∶GdCOB晶体中实现了由1331.0nm到665.5nm的自倍频激光运转,阈值能量为14.2mJ; 当泵浦能量为25mJ时,665.5nm激光的输出能量为0.62mJ,相应的转换效率为2.5%.     

Phase-conjugation property of one-photon pumped backward stimulatedemission from a lasing medium

Optical phase-conjugation properties of the backward stimulated radiation from a one-photon pumped lasing medium have been studied. The gain medium is a dye solution (pyrromethene 597 in ethanol) or the same dye doped poly(methyl methacrylate) (PMMA) rod pumped with ~7-ns and 532-nm laser pulses. A highly directional and phase-conjugate backward stimulated emission at ~573 nm wavelength could be obtained with a conversion efficiency of ~42% by using a 1-cm-long dye solution sample at the concentration level of d₀=0.000 15 mol/L. The spectral, temporal, output/input, and phase-conjugation properties of this backward stimulated emission are presented in detail. The induced aberration influence, which is much larger than the divergence angle of the input pump beam, can be basically removed by the backward stimulated emission; however, the fidelity of the near-field detail for the backward stimulated emission is relatively poor. A quasi-collinear holographic interaction model and a mathematical analysis are presented to explain the basic experimental results