LD端面泵浦内腔倍频全固态绿光激光器研究进展

激光二极管泵浦的内腔倍频全固态绿光激光器发展迅速,已经在通讯、医疗、激光显示和科学研究等领域得到了较为广泛地应用。研究高效率、高功率、高光束质量和/或高稳定性的全固态绿光激光器仍是当前研究的主要内容。以内腔倍频的方式产生绿光激光,对于平衡这几个方面的激光性能有较大优势。通过分析总结LD端面泵浦内腔倍频绿光激光器的研究历史可以看出,人们在研究绿光激光器的过程中始终以突破其中某一项性能指标或者平衡部分指标来优化性能为目标。对世界范围内的相关研究进行对比,标定目前所达到的研究水平,对于即将开展相关研究的科研工作者是一份有益的参考。目前来看,LD端面泵浦内腔倍频绿光激光器某些单方面的性能指标已经达到相当高的水平,并且很多是国内的研究者率先达到的。目前研究的重点应该是如何采取更好的方法使得激光器各方面突出的性能指标集于一体。     

科学中国人专家委员会委员介绍

沈德忠,中国工程院院士,人工晶体专家,1941年生,贵州省贵阳市人。中材料技集团总公司人工晶体研究院高级工程师,清华大学教授。长期从事无机非金属晶体材料的生长、应用及探索研究。先后生长出铌酸钾（KN）、磷酸氧钛钾（KTP）等10多种晶体;研制成功高光学质量的大单畴KN晶体,使该晶体的批量生产和实际应用成为可能;首次在掺铁KN晶体上实现了室温自泵浦相位共轭;首次用改进熔剂法研制成功大块高光学质量的KTP单晶,不但打破了美国对该晶体的垄断和对我国的禁运,而且批量生产和出口,效益显著。     

PbSe quantum dots for an evanescent wave excited fiber amplifier

A novel quantum dots (QDs) optical fiber amplifier was proposed and demonstrated. It was fabricated by dipcoating the PbSe QDs doped sol onto the taper region of fiber coupler. The PbSe QDs was synthesized according to a colloidal method. A lower refractive index sol was also synthesized as the host of PbSe QDs. A standard single mode fiber was used to make the fusion tapered fiber coupler which had double input and output ports. With the simple structure, a signal and a pump can be injected into the amplifier and excite the PbSe QDs through evanescent wave. The experimental results indicated that the amplified light wave was observed at 1 550 nm wavelength with 980 nm wavelength laser diode as pump.     

基于Nd:YAG/LBO倍频蓝光的全固态激光综合实验系统

基于Nd:YAG/LBO内腔倍频开发了一套多功能全固态激光综合实验系统。创新性地引入准三能级Nd:YAG激光器、非线性光学倍频技术及独立温控技术,扩展了全固态激光器实验教学的内容,能够全面锻炼学生在全固态激光及非线性光学领域的实践能力,尤其是对激光二极管(LD)泵浦源、Nd:YAG晶体能级结构及倍频的相位匹配等概念与技术的理解。该综合实验系统在经济性、适用性、功能性及科学前沿性等方面与现有装置相比均具有明显优势,相关实验受到了学生的欢迎。     

Sensitized Up—Conversion Luminescence of Ho^3＋ in Nd^3＋—Yb^3＋—Ho^3＋ Co—doped ZrF4—Based Glass

Up-conversion processes for the blue, green and red emissions were found two-photon phenomenon, known as the cooperative phenomenon. This phenomenon was assisted by Nd³⁺ → Yb³⁺ → Ho³⁺ energy transfer. The strong green emission due to the Ho³⁺ : (⁵F₄, ⁵S₂)→ ⁵I₈ transitions was observed in Nd³⁺-Ho³⁺ co-doped ZrF₄-based fluoride glasses under 800 nm excitation. As an attempt to enhance Ho³⁺ up-conversion luminescences in the Nd³⁺ – Ho³⁺ co-doped ZrF₄-based glasses, Yb³⁺ ions were added to the glasses. As a result it was found that, in 800 nm excitation of 60 ZrF₄. 30BaF2. (8-x)LaF₃. lNdF₃. xYbF₃. 1HoF₃ glasses (x=0 to 7), sensitized up-conversion luminescences are observed at around 490 nm (blue), 545 nm (green), and 650 nm (red), which correspond to the Ho³⁺ : ⁵F₃ → ⁵I₈, ( ⁵F₄, ⁵S₂)→⁵I₈ and ⁵F₅→ ⁵I₈ transitions respectively. The intensities of the green and red emissions in a 3 mol % YbF₃-containing glass were about 50 times stronger than those glasses without YbF₃. This is based on sensitization due to Yb³⁺ ions. In particular, the green emission was extremely strong and the Nd³⁺-Yb³⁺-Ho³⁺ co-doped ZrF₄-based glasses have a high possibility of realizing a green up-conversion laser glass. In this paper the up-conversion mechanism in the glasses is discussed in detail.     

LD端面泵浦高效Nd:YVO_4激光器的研究

对激光二极管泵浦高效Nd:YVO4固体激光器的输出功率特性进行了研究。在基波光最大输出550mW时,光-光转换效率为55%,激光器的性能比较稳定,输出光斑为TEM00模。并对实验结果进行了简单的分析和讨论。     

腔损耗对规则泵浦单原子微激光的影响

1Introduction Theone atommicromaserhasattractedconsiderable interestsinceitwasrealizedexperimentallyin1985[1]. BecauseitdirectlyapprovestheJaynes Cummings modeloftwo level atominteractionwithasinglemode oftheelectromagneticfieldandexhibitsanumberof quantumfeaturesincludinggenerationofphotonnum bertrappingstates[2,3],highlypureFockstatesof cavityfieldsandPoissonian,sub Poissonianphoton distribution[4,5],etc.Itisatrulyquantum mechanical fieldandprovidesausefulapproachtothestudyofin teraction…     

一种可用于光抽运共振实验的新泵浦源

本文介绍一种可用于光抽运实验的新泵浦源, 该光源具有高稳定、可调节、可调制和多波长范围等特点; 并介绍该源在原子跃迁谱线观测中的一种应用.     

Exact solution to the forward degenerate four-wave mixing intransmission geometry in photo refractive media

A method for exact solution to forward degenerate four-wave mixing in transmission geometry for photo refractive media is presented. The effects of pump depletion and light absorption in the nonlinear dynamic media are taken into account. The energy transfer curves are obtained, and the concvision is compared with previous result in the case of pump light to be constant.     

一组高精度的半导体激光二极管伺服控制电路

介绍一组高精度的半导体激光二极管伺服控制电路，室温下该电路的电流稳定度达10^-3mA，温度稳定优于10^-2K。