共查询到19条相似文献,搜索用时 187 毫秒
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三硼酸铯和硼酸铯锂晶体的晶格振动光谱研究 总被引:1,自引:0,他引:1
本文对新型非线性光学晶体三硼酸铯(CsB3O5∶CBO)和硼酸铯锂(CsLiB6O10∶CLBO)进行了晶格振动光谱研究。首先对两种晶体的基本晶格振动模进行了对称性分类,记录了两种晶体低温下的拉曼光谱和室温下的红外反射光谱,对晶体的晶格振动模进行了认定,将振动模归属于平面六元环(B3O6)和四面体(BO4)。然后比较了CBO,CLBO和LBO(LiB3O5)三种晶体的晶格振动光谱,讨论了阳离子对振动光谱的影响。另外,还讨论了硼酸盐晶体晶格振动模LO TO分裂的大小与晶体非线性光学系数之间的关系。 相似文献
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NdvCa4GdO(BO3)3(简称NdvGdCOB)是一种新型自倍频晶体[1]。利用该晶体实现1060.0nm的自倍频绿光输出,因内外均已有报道[2]。我们利用Datachrom5000型染料激光器泵浦该晶体成功地实现了1331.0nm基频光和665.5nm自倍频红光的输出。NdvGdCOB属单斜双轴晶体,具有明显的偏振吸收特性。生长该晶体所用原料为Ca4Nd0.08Gd0.92O(BO3)3。晶体样品尺寸为3mm×3mm×8mm,通光方向为x(x轴与晶体的c轴的夹角为12°,z轴与a轴的夹… 相似文献
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报道了KDP晶体中的三倍频产生的实验研究,计算了比较了直接三倍频过程和级联过程对KDP晶体三阶有效非线性系数的贡献,并探讨了KDP作为非线性晶体材料三阶非线性系数测量基准的可行性。 相似文献
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新型光学晶体KABO的非线性频率变换特性 总被引:2,自引:0,他引:2
简述了新型非线性晶体KABO的光学特性.根据相位匹配角公式、非线性有效系数公式、走离角公式和允许角公式,详细计算了KABO晶体倍频时的相位匹配角、非线性有效系数、倍频时谐波走离角、允许角随波长变化的理论曲线.特别是对LD泵浦掺钕的全固态激光器532 nm输出时,得到了KABO晶体采用I类相位匹配进行四倍频的相位匹配角、非线性有效系数、倍频时谐波走离角、允许角分别为:58.1°、0.254×10-12m/V、2.8°、1.8233 mrad·mm;并将该晶体与目前可应用于紫外倍频的晶体比较,在考虑走离效应的情况下,研究了四倍频转换效率随KABO晶体长度、基频光光斑半径的变化规律. 相似文献
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低对称性非线性光学晶体硼酸铋(BIBO)的1064nm三倍频性质 总被引:2,自引:2,他引:0
采用高温溶液法成功生长出高光学质量的硼酸铋 (BIBO)晶体 ,尺寸达到 2 4mm× 19mm× 35mm ,质量为4 8g。对BIBO晶体进行了定向 ,并测量了该晶体的主轴折射率。讨论了BIBO晶体的 10 6 4nm三倍频性质 ,包括相位匹配角、有效非线性光学系数deff、容限角、走离角等。结果表明 ,BIBO晶体的最佳三倍频方向为 (137.7°,130°) ,其有效非线性光学系数值达到 3.6 0 pm/V ,属I类相位匹配。就主平面内的相位匹配方向而言 ,(14 6 .4°,90°)具有最大的有效非线性光学系数值 ,为 3.16pm/V。在 10 6 4nm的腔外三倍频实验中 ,(14 6 .4° ,90°)BIBO晶体的转换效率达到 39.5 % ,角度容限半宽为 0 .2 2mrad·cm ,该数值与 0 .175mrad·cm的计算值基本符合。由于(33.6°,90°)BIBO晶体的有效非线性光学系数较小 (0 .31pm/V) ,其三倍频转换效率小于 5 %。 相似文献
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阐述了紫外无机非线性光学晶体分子工程学探索方法的基本特点,具体分析深紫外无机非线性光学晶体硼铍酸锶(SBBO)以氟硼铍酸钾(KBBF)为主要参考晶体的分子设计方法,随后根据晶体结构研究、单晶培养、和非线性光学性能测定等实验结果讨论SBBO作为新型深紫外无机晶体的主要优点,即它既具有更短的紫外吸收边(接近155nm)和较大的非线性光学系数(d22(SBBO)=06×d22(BBO)=138pm/V),同时晶体无明显层状习性,并肯有良好的化学稳定性和机械性能 相似文献
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NdCa4YO(BO3)3(简称NdYCOB)是一种新型的自倍频晶体[1~3]。根据测定的吸收光谱,它有5条较宽的吸收带,因而极适合于用脉冲氙灯进行泵浦。作者利用脉冲氙灯泵浦NdYCOB实现了基频光和自倍频光的运转。实验中所用晶体掺杂的摩尔分数为0.... 相似文献
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本文用自制的Q-YAG的倍频光泵浦Rh·6G染料,用调谐的染料激光束(562—598nm)与YAG的倍频光束在B-BaB2O4(BBO)晶体中和频,获得的连续可调谐范围是271-281.5nm,和频输出能量大子200μJ,最高转换效率为5%.我们用陈创天等人和K.Kato所给BB0晶体的Sellmetier方程计算了和频调谐曲线,它们之间的相位匹配角大约有一度之差.实验曲线与两条理论曲线都有不同程度的偏差.但是,与K.Kato的理论曲线更为接近.我们还讨论了BBO晶体的长度对输出能量的影响,并解释了产生这种影响的原因。 相似文献
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The beam divergence effects of the input pump laser on a high power nanosecond optical parametric oscillator (OPO) have been numerically simulated. The OPO conversion efficiency is affected due to the angular deviation of real laser beams from ideal phase matching conditions. Our theoretical model is based on the decomposition of the Gaussian beam and assumes each component has a single deviation angle and thus a particular wave vector mismatch. We take into account the variable intensity profile in the spatial and temporal domains of the Gaussian beam, the pump depletion effects for large-signal processes as well as the oscillatory effects of the three waves. Two nonlinear crystals β-BaB2O4 (BBO) and LiB305 (LBO) have been investigated in detail. The results indicate that the degree of beam divergence strongly influences the maximum pump intensity, optimum crystal length and OPO conversion efficiency. The impact of beam divergence is much more severe in the case of critical phase-matching for BBO than in the case of non-critical phase-matching for LBO. The results provide a way to choose the optimum parameters for a high power ns OPO such as the nonlinear material, the crystal length and the pump intensity, etc. Good agreement is obtained with our experimental results. 相似文献
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M. Peltz J. Bartschke A. Borsutzky R. Wallenstein S. Vernay T. Salva D. Rytz 《Applied physics. B, Lasers and optics》2005,81(4):487-495
We report a study of second- and third-harmonic generation in BiB3O6 (BiBO). The effective nonlinearity, phase-matching angle, acceptance bandwidth, and walk-off are calculated and analyzed within the principal planes of the optical indicatrix. In the experiment, the phase-matched harmonic generation is investigated within the xz and yz planes. Also, the temperature dependence of the noncritical phase matching for laser radiation propagating along the z axis is measured for second-harmonic generation (SHG) at crystal temperatures of 25–265^∘C. The corresponding wavelengths of the laser radiation are in the range of 1.16 to 1.34μm. In addition, SHG of 1342-nm radiation of a q-switched Nd:YVO4 laser system is investigated for noncritical and critical phase matching. The achieved conversion efficiencies are 59% and 20%, respectively. Besides SHG, third-harmonic generation (THG) of 1064-nm, ns laser pulses is investigated. The measured conversion efficiency is as high as 34%. For THG the properties of BiBO are compared with those of BBO and LBO. 相似文献
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BBO晶体在CPM非稳腔Nd:YAG激光器中的腔内倍频效应 总被引:1,自引:1,他引:0
本文报道用BBO晶体作为腔内倍频元件,在带抗共振环的对撞脉冲锁模非稳腔Nd:YAG激光器中实现腔内倍频激光输出,获得倍频能量转换效率为50.4%.理论和实验均证明了该激光器的BBO腔内倍频转换效率高于腔外倍频转换效率. 相似文献
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Harmonic and sum-frequency generation of pulsed laser radiation in BBO,LBO, and KD*P 总被引:1,自引:0,他引:1
A. Borsutzky R. Brünger Ch. Huang R. Wallenstein 《Applied physics. B, Lasers and optics》1991,52(1):55-62
The optical properties of the nonlinear crystals lithium borate (LBO), barium borate (BBO) and deuterated potassium phosphate (KD*P) are compared for second and third harmonic generation of Nd:YAG laser radiation. In an experimental investigation the conversion efficiency has been measured as a function of the energy density of 8 ns long laser pulses, generated by a commercial Nd:YAG oscillator-amplifier system. In LBO and BBO the second harmonic generation saturates at an energy density of about 1.5 J cm–2 at efficiencies of 55–60%. In KD*P comparable efficiencies (40–55%) require energy densities of 2–2.6 J cm–2. Similar results are obtained for frequency tripling. In LBO and BBO saturated efficiencies of 20–25% are measured at an energy density of about 1.5 J cm–2. In KD*P efficiencies of 20% are obtained at energy densities exceeding 2 J cm–2. Besides for doubling and tripling of Nd:YAG laser radiation the phase-matching is calculated for frequency conversion of tunable laser light. The results demonstrate that in LBO and BBO phase-matched sum-frequency mixing of UV and infrared laser light generates tunable radiation at wavelengths as short as the transmission cut-off at 160 nm and 190 nm, respectively. 相似文献
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ZHANG Shujun CHENG Zhenxiang LI Guangming WANG Changqing HOU Xueyuan SUN Yuming Y. T. Chow SHAO Zongshu CHEN Huanchu 《中国光学快报(英文版)》2000,9(3)
NdxGd1-xCa4O(BO3)3 (NdGdCOB) is a new self-frequency-doubling (SFD) solid-solution crystal. The second-harmonic generation (SHG) phase-matching (PM) curves were calculated by using refractive indices. The deff of NdGdCOB crystal along different PM directions were calculated according to the sellmeier equation and dijk data in which the (θ=66.8°, φ=132.6°) PM direction has the highest deff. SFD experiments were carried out with Ti:sapphire CW laser and pulsed dye-laser. A green laser output power up to 225 mW at 530 nm was achieved from a 7×3×3 mm3 crystal sample pumped by 1560 mW CW Ti:sapphire laser. The lasing threshold of SFD was lower than 1.8 mW along the PM direction (66.8°,132.6°). The optical-optical conversion efficiency was 14.4%. The conversion efficiency was 7.7% when 10×3×3 mm3 sample was side-pumped by the pulsed dye-laser tuned to 595.4 nm with 17.5 mJ energy and the lasing threshold is 1.2 mJ. 相似文献
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ZHANG Shujun- CHENG Zhenxiang- LI Guangming- WANG Changqing- HOU Xueyuan- SUN Yuming- Y. T. Chow- SHAO Zongshu- CHEN Huanchu- 《Chinese Journal of Lasers》2000,9(3):282-286
1 Introduction Inthepastfewyears,smallsizedSFDlaserhasattractedgreatattentions.Laserdiode(LD)pumpedsolidstatelasershavebeenfoundveryusefulinthefieldsofmilitary,industry,medicaltreatmentandscientificresearchesduetotheadvantagesofhighstability,compactness… 相似文献