共查询到19条相似文献,搜索用时 171 毫秒
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采用非相干泵浦、受激辐射和纯退相干的量子主方程研究了量子点腔耦合系统,得出腔与量子点发射光谱解析解.理论分析显示,在非谐振耦合系统中纯退相干能使腔发射谱产生明显的移位效应,从而可以解释“非谐振耦合腔有效发射”效应.为了进一步研究纯退相干在量子点腔耦合系统上的应用,引入了系统有效耦合率和单光子源效率,并通过比较有效耦合率与腔耗散定义出好腔与坏腔机制.选取两组依据实验数据作为参量,在共振与失谐时研究了纯退相干对系统有效耦合率和单光子源效率的影响.结果表明:纯退相干可提高失谐系统有效耦合率与单光子源效率,从而可能使坏腔转变为好腔|两组参量中有较大耦合效率一组在一定范围内满足好腔机制,其单光子源效率明显优于另一组.在非谐振耦合系统比较了好腔机制与坏腔机制的激光,好腔机制是实现单量子点激光的必要条件|由于非谐振耦合系统Fano因子无最大值出现,从而该系统可能无激光阈值. 相似文献
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基于光纤光栅谐振腔的掺镱全光纤激光器设计(英文) 总被引:1,自引:0,他引:1
采用数值分析方法分析了光纤长度、后腔镜反射率等因素对激光器输出阈值泵浦功率、输出功率的影响,为全光纤激光器的优化设计提供了理论基础.在设计过程中采用光纤光栅作为光纤激光器的反馈与选频腔镜,通过锥度光纤实现了泵浦模块与掺镱双包层光纤之间的低损耗连接以及高效率的泵浦激光功率传输,成功研制了具备稳定窄化线宽激光输出的掺镱全光纤激光器.实验得到了波长峰值在1 082 .50 nm,谱线宽度0 .113 nm,最大输出功率8 .5 W,泵浦阈值功率0 .8 W,斜率效率为70 .8 %的稳定激光输出. 相似文献
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用国产双异质结半导体激光列阵(DH-LDA泵浦Nd:YAG激光器进行腔内倍频,得到了0.6mW的535nm激光输出,倍频效率为2%;进行了不同脉宽,不同功率的高重复率泵浦实验,利用位相延迟匹配技术,得到了稳定的信频激光输出.分析计算了泵浦阈值,与实验结果基本一致. 相似文献
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半导体激光(LD)泵浦的高功率光纤激光器具有效率高、体积小、重量轻、稳定性好等优点,在工业加工等诸多领域都有着广泛的应用。为了提高泵浦光吸收率,传统光纤激光器常用915 nm和976 nm波段的LD作为激光的泵浦源。在该类LD泵浦的光纤激光器中,由于量子亏损和泵浦吸收系数相对较高,光纤激光器的热致模式不稳定(TMI)阈值相对较低。为了提高量子效率和潜在的TMI阈值,提出采用大于1 010 nm波段的LD直接泵浦光纤激光器,产生高量子效率激光。搭建了振荡放大一体化的全光纤激光器,采用总泵浦功率为2.56 kW的1 010 nm波段LD泵浦,首次获得输出功率2.05 kW、光束质量M2约1.7的激光。后续将通过进一步增大泵浦功率、优化光纤特性以实现更高功率、更优光束质量的光纤激光输出。 相似文献
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强泵浦下掺Yb3+双包层光纤激光器输出特性数值分析和实验研究 总被引:6,自引:0,他引:6
对强泵浦下线形腔掺Yb3+双包层光纤激光器输出特性进行了理论和实验研究。通过数值模拟,分析了泵浦光及激光在光纤中的分布、输出功率与泵浦功率的关系、光纤长度及腔镜反射率对激光输出功率的影响。在实验中,利用D型掺Yb3+双包层光纤获得了输出功率10 6W的光纤激光输出,斜率效率达86%。测量了在不同输出耦合条件下的输出功率、阈值泵浦功率和斜率效率,理论分析与实验结果基本一致,为进一步提高光纤激光器功率提供了理论和实验依据。 相似文献
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S. G. Li Q. Gong C. F. Cao X. Z. Wang J. Y. Yan Y. Wang H. L. Wang 《Optical and Quantum Electronics》2014,46(5):623-640
Since the external cavity quantum dot laser was first demonstrated, the performances have been improved in terms of operation temperature, output power, pulse generator and tuneability based on the naturally size fluctuation of quantum dot. Nowadays, the external cavity quantum dot sources have been successfully used in different absorption spectroscope techniques, in industry, biomedical and research. In this paper we reviewed the recent developments of quantum dot lasers operated in a grating-coupled external cavity system where a single frequency and wide tunable wavelength range were easily obtained by adjusting the grating angle. In all cases, we mainly stressed the significant progresses in understanding of basic optical and electronic properties to enable the importance steps forward. The prospects for further progress directed towards stability, mode-hoping-free tuning range, miniaturization and integration of the external cavity quantum dot lasers also reviewed. 相似文献
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本文简要综述了硅基III-V族量子点激光器的研究进展. 在介绍了量子点激光器的优势和发展后, 重点介绍了近年来硅基、锗基III-V族量子点材料生长上的突破性进展及所带来的器件性能的大幅提高, 如实现了锗基和硅基1.3 μm InAs/GaAs量子点激光器的室温激射, 锗基量子点激光器的阈值电流低至55.2 A/cm2并可达60 ℃以上的连续激射, 通过锗硅虚拟衬底, 在硅基上实现了30 ℃下以16.6 mW的输出功率达到4600 h的激光寿命, 这些突破性的进展为硅基光电子集成打开了新的大门. 相似文献
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《Physica E: Low-dimensional Systems and Nanostructures》2011,43(10):2489-2492
We demonstrate a photonic crystal nanocavity laser essentially driven by a self-assembled InAs/GaAs single quantum dot gain and its unique photon statistics. Gain tuning measurements and photon correlation measurements indicated that a single quantum dot plays a substantial role in the laser oscillation. Photon correlation measurements showed a distinct transition from anti-bunching to Poissonian via photon bunching around the threshold with the increase of the excitation power. Numerical simulations, including contributions of other light sources besides a single quantum dot, indicated that the photon bunching feature around the threshold can be enhanced by the interfusion of incoherent photons into the cavity mode. 相似文献
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We report a quantum dot microcavity laser with a cw sub-microW lasing threshold, where a significant reduction of the lasing threshold is observed when a single quantum dot (QD) state is aligned with a cavity mode. The quality factor exceeds 15,000 before the system lases. When no QD states are resonant, below threshold the cavity mode initially degrades with increasing pump power, after which saturation occurs and then the cavity mode recovers. We associate the initial cavity mode spoiling with QD state broadening that occurs with increasing pump power. 相似文献
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YIN Tao DU Jinyu LIAN Peng XU Zuntu CHEN Changhua GUO Weiling LIU Ying LI Shuang GAO Guo ZOU Deshu CHEN Jianxin SHEN Guangdi 《Chinese Journal of Lasers》1999,8(5):397-401
1lntroductionCarhan,aIVcolutnnelement,hasmanyadvantagesinGaAsAlGaAsmaterials,suchasIowdiffudricoefficient,relativelowactivateenergyabout26meV,highincmptiOnconcentratboandhighm0bilityduetothelowcomensaterate.SocarbonhasbeenwidelyusedinGaAsAlGaAsheter0unctionbipoartransistors(HBT),modulationdoPingfieldeffecttransistors(m),tunneldiodes,iInPurityinducedlayerdisorderinglaserdiodeS,anddistributedBraggreflectors(DBRs)intheverticalcavitysurfaceedrittinglasers(VCSEL).Ingeneral,therearesever… 相似文献
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YIN Tao DU Jinyu LIAN Peng XU Zuntu CHEN Changhua GUO Weiling LIU Ying LI Shuang GAO Guo ZOU Deshu CHEN Jianxin SHEN Guangdi MA Xiaoyu CHEN Lianghui 《中国光学快报(英文版)》1999,8(5)
By low-pressure metalorganic chemical vapor deposition (LP-MOCVD) system,InGaAs/AlGaAs graded-index separate-confinement heterostructure strained quantum well lasers are grown with carbon doped the upper cladding layer and the capping layer. Carbon tetracholride (CCl4) is used as the carbon source. 100 μm oxide stripe lasers are fabricated,and the laser output power per facet (uncoated) reaches 1.2 W with 2A injection current under the room temperature continuous wave (CW) operation. The threshold current density is 150 A/cm2 with 1000 μm cavity length. The slope efficiency per facet reaches 0.53W/A,and the total external differential quantum efficiency is above 85%. The relations between the threshold current densities,the differential quantum efficiency and the cavity length are studied. 相似文献
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Alexander I. Nosich Elena I. Smotrova Svetlana V. Boriskina Trevor M. Benson Phillip Sewell 《Optical and Quantum Electronics》2007,39(15):1253-1272
Research into microdisk lasers demonstrates new achievements both in the technology and in the associated physical effects
and applications. Melting and rounding of the disk edge boosts the Q-factors due to improved surface smoothness. In-plane
cavity shape is widely used as a design instrument. Optimal shaping of pumped area lowers the threshold power. Photonic molecules
made of several microdisks as “photonic atoms” show lasing at several closely spaced frequencies. A microdisk with a single
quantum dot as an active region is considered as the most promising system for realisation of a single photon emitter necessary
for quantum computing. These new effects and devices can be simulated with accurate numerical techniques, developed recently
for “warm-cavity” linear modelling, that are able to bring a new vision of the physics of lasing. 相似文献