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辅助光对NaCl(OH-)和KCl(Na+,OH-)晶体中的类F2+型色心激光输出的影响 总被引:1,自引:1,他引:0
文中报进了有关辅助光对NaCl(OH-):(F2+)H及KCl(Na+,OH-):(F2+)AH色心激光输出功率影响的主要研究结果。初步探讨了辅助光作用的物理机制。 相似文献
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本文利用多中心壳模型的Hartree-Fock方法,引进了Volkov型的双高斯Λ-N有效相互作用位,对Λ13C与Λ9Be结合能给出了令人满意的结果。与拟合s波Λ-p散射数据的有效势比较,我们认为Λ-N相互作用中p波至少比s波弱1/3。此外,Majorana交换力也是重要的,但与模型有关。 相似文献
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在RIKEN-RIPS上测量了23Al等丰质子核素的核反应总截面(σR)和平行动量分布(P//). 观察到了23Al核反应总截面的增强, 与以前的实验结果相符. 同时得到了23Al等丰质子核素擦掉一个质子后的P//. 在Few-body Glauber模型下对实验结果进行了讨论. P//的宽度显示23Al基态的外层质子处于d态, 这与g因子测量实验结果一致. 为了同时解释P//和σR的实验测量结果, 我们认为23Al可能有核芯增大的现象. 相似文献
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本文利用重层子模型[1]中得到的介子B-S波涵数讨论介子的轻子型弱衰变、电磁衰变和各种二体强衰变过程. 除了解释fπ≈fK, 1-→l+l-等过程外, 计算得到的各种强衰变宽度也都同实验基本符合. 相似文献
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本文利用我们以前所得到的A-N交换势,计算了A3He和A3H基态结合能之差,此外还计算了A3H的两个低激发态的激发能。我们的计算结果与实验相比较还是合理的。 相似文献
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采用飞片碰撞技术,在TNT/RDX(40/60)炸药中获得了2.5倍于正常爆轰的最大超压值,得到了超压爆轰下爆轰产物物态方程p=Aρk+A1(p-pJ)(p-爆压,单位GPa,ρ-密度,单位kg/m3,A=ρJ/ρkJ,pJ=27.06 GPa,ρJ=2.3×103 kg/m3,k=2.77,A1=2.7×10-3 GPa-1,下表J代表正常爆轰状态)。该方程还可以较好地描述超压爆轰产物的二次冲击状态。 相似文献
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Scattering-enhanced femtosecond optical parametric generation (OPG) has been observed and studied in detail, which may decrease the pump threshold of OPGs dramatically and may make OPGs reliable. The experimental demonstration in a LiNbO3 crystal shows that strong enough OPG can be obtained at pump intensity of only about 30GW/cm2 which is well below the crystal damage threshold Either a synchronized pulsed laser or a cw laser has been used as the scattering source, of which the wavelength, spectral shape and irradiating angle are not strictly required. 相似文献
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We present a high power and efficient operation of the ^4F3/2 → ^4I9/2 transition in Nd:GdVO4 at 912nm. In the cw mode, the maximum output power of 8.6 W is achieved when the incident pump power is 40.3 W, leading to a slope efficiency of 33.3% and an optical-optical efficiency of 21.3%. To the best of our knowledge, this is the highest cw laser power at 912nm obtained with the conventional Nd:GdVO4 crystal. Pulsed operation of 912nm laser has also been realized by inserting a small aeousto-optie (A-O) Q-Switch inside the resonator. As a result, the minimal pulse width of 20ns and the average laser power 1.43 W at the repetition rate of lOkHz are obtained, corresponding to 7.1 kW peak power. We believe that this is the highest laser peak power at 912nm. Furthermore, duration of 65ns has also been acquired when the repetition rate is 100 kHz. 相似文献
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We report that a deep ultraviolet (DUV) laser from the sixth harmonic of a 1064nm laser has been firstly used as light source in an ultrahigh energy-resolution angle-resolved photoemission spectroscopy (ARPES). The wavelength is 177.3nm obtained by using the second harmonic KBe2BO3F2 crystal with a frequency tripled 1064nm Nd:YVO4 laser. The large flux (10^14 - 10^15 photons/s) and narrow line width (0.26 meV) are suitable for the ultrahigh-energy resolution ARPES. The laser-ARPES can be a powerful tool to study the electronic structure at and near the Fermi level of the superconductor and correlated materials. The laser-ARPES has worked more than 500 h already. 相似文献
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D. Jaque J. Capmany J. García Solé A. Brenier G. Boulon 《Applied physics. B, Lasers and optics》2000,70(1):11-14
This work reports for the first time continuous-wave laser action at room temperature around 1.3 7m in Nd3+ doped LiNbO3:ZnO. Optical spectroscopy has been used to determine the main laser characteristics of 4F3/24I13/2 channel, such as emission cross section and excited-state absorption cross section at laser wavelengths. Internal optical losses have been estimated from laser gain experiments. Under non-optimal conditions laser slope efficiencies of 30% have been obtained. 相似文献
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The angular distributions of CO^+ from the dissociation of CO2^2+ and CO2^+ in intense femtosecond laser fields (45 fs, about 5 × 10^15 W/cm^2) are studied at a laser wavelength of 800nm based on the time-of-flight mass spectra of CO^+ fragment ions. The experimental results show that structural deformation occurs in the charge state of CO2^2+ and the CO^+ maintains linear geometrical structure. 相似文献
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本文应用一维双温激光靶相互作用简化物理模型对脉宽为10ns级系列脉冲激光照射真空中铝靶产生的LSD波进行了数值研究。对于单个脉冲宽度τ_p=10ns,脉冲间距τ_p=50ns的系列脉冲情况,得到了LSD波点火的脉冲个数N_(LSD)与单脉冲归一化强度(I_s/I_(LSD))的关系。分析了系列脉冲激光LSD波点火的积累效应以及LSD波的屏蔽效应。 相似文献
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By using an Ar^+ ion laser, a tunable Rh 6G dye laser (linewidth 0.5cm^-1) pumped by the second harmonic of a YAG:Nd laser and a Coherent 899-21 dye laser as light sources and using a monochromator, a phase-locking amplifier and a computer as the data detecting system, we detect the optical properties of Eu^3+-doped Y2SiO5 crystal. Persistent ,spectral hole burning (PSHB) are observed in the Eu^3+ ions spectral lines (^5 Do-T Fo transition) in the crystal at the temperature of 16K. For 15mW dye laser burning the crystal for 0.1 s spectral holes with hole width about 80 MHz both at 579.62nm and at 579.82nm are detected and the holes can remain for a long time, more than 10h. 相似文献
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Simultaneous Generation of Multi-Wavelength Laser from Nd:YAG Crystals in a Cruciform Cavity 下载免费PDF全文
A cruciform cavity is presented for multi-wavelength laser generation. On the basis of considering the optimal power ratio and good spatial overlap of the two fundamental beams, the maximum output power of 589 nm laser reaches 3.5 W when the pumping power of Nd:YAG A and Nd:YAG B are 311.5 W and 261.8 W, respectively. At the same time, the other wavelength lasers are also obtained with the output power distribution of 2.5 W at 66Onto, 15 W at 532nm, lOOmW at 1319nm and 240mW at 1064nm. The corresponding beam quality factors are M^2 x = 4.93, M^2 y = 5.01 at 589nm, M^2z = 4.51, M^2 y = 4.85 at 660hm, and M^2 x = 4.12, M^2 y = 3.96 at 532nm, respectively. The instabilities of the three visible lights are measured, which are also less than 2% within three hours. 相似文献
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We present a comparison between intracavity cooling and external cavity cooling for optical refrigeration. The results show that the intracavity scheme is preferred at low optical densities (〈 0.008), while the external cavity scheme is preferred at higher optical densities (〉 0.01). We can choose the proper scheme for different eases in experiments. Moreover, under the same conditions, taking Yb^3+-doped ZBLAN (ZrF4-BaF2-LaF3-AlFa-NaF) film as an example, the cooling processes of the two scheme are obtained. The calculated results show that intracavity cooling will achieve a larger temperature drop for a thin film sample. Finally, the diode laser may become a candidate for the intraeavity model briefly discussed. 相似文献
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Distinct orientation of AlN thin films deposited on sapphire substrates by laser ablation 总被引:1,自引:0,他引:1
J. Meinschien F. Falk R. Hergt H. Stafast 《Applied Physics A: Materials Science & Processing》2000,70(2):215-218
We report the experimental characterization of the charged species produced in excimer laser ablation of a superconducting intermetallic compound (YNi2B2C). By using energy-selective time-of-flight mass spectrometry, we have obtained direct measurements of both mass spectra and kinetic energy distributions of ions. The investigation has been carried out in the laser fluence range 1-5 J cm-2, which is typical of laser ablation thin film deposition. High kinetic energies of the charged component (up to 0.4 keV) have been observed even at moderate laser fluences. 相似文献