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推导了描述稳态运行,具有腔内光放大的环形腔单共振光参量振荡器(ICOASRO)的功率特性的高斯光束理论.在这种结构的单共振光参量振荡器(SRO)中,适当地选择光放大器的参数,可以很大程度地降低单共振光参量振荡器的抽运阈值.在平均场近似下无二阶非线性交叉耦合作用的具有腔内光放大的环形腔单共振光参量振荡器的工作范围分成四个工作区域,且存在最小的单共振光参量振荡器的抽运阈值.文中的分析考虑了作为光放大器的激光增益介质的端面抽运特性,考虑了一般化单共振光参量振荡器的特性.
关键词:
单共振光参量振荡器
光放大
阈值 相似文献
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《物理学报》2019,(24)
针对脉冲抽运机制下多光参量振荡器内1.57μm和3.84μm跨周期参量光的能量耦合过程,利用含时波动方程建立起关于时间的能量转换模型,并运用分步积分法对模型进行求解,获得参量光转换效率.模拟多光参量放大器输出参量光波形,证实逆转换和模式竞争是影响多光参量振荡的重要因素.进一步,模拟外腔多光参量振荡器1.57μm和3.84μm跨周期参量光的输出情况.分别对比不同输出透过率、晶体长度和谐振腔长度下转换效率的模拟值,证实了输出镜透过率影响1.57μm和3.84μm跨周期参量光的转换效率,同时表明外腔多光参量振荡器存在最佳晶体长度和谐振腔长度.基于仿真结果,开展外腔多光参量振荡器实验.1.57μm和3.84μm参量光转换效率实验值与理论值相吻合,证实此方法能精准地反演多光参量振荡器的能量转换过程,为优化多光参量振荡器、提高参量光转换效率提供了理论依据. 相似文献
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太阳光直接抽运激光器在空间光通信、遥感等领域有着重要的潜在应用,但是一直以来人们对太阳光抽运激光器的研究局限于以掺Nd3+粒子为增益介质的1μm波段.通过对现有固体激光工作物质的吸收谱进行分析,发现掺Tm3+离子在太阳辐射较强的可见光波段具有强的吸收峰,使2μm人眼安全波段实现太阳光直接抽运激光输出成为可能.本文对Tm:YAG和Tm:YAP两种常见晶体的吸收谱与太阳光谱匹配度进行了分析计算,得出两种材料用于太阳光抽运激光器的阈值抽运功率密度分别为1.14和1.434 kW/cm3.选择与抽运阈值功率密度低的Tm:YAG晶体作为增益介质,使用TracePro软件建立太阳光抽运激光器的二级抽运模型,并对模型进行优化,得到了锥形腔窗口与菲涅耳透镜的最佳距离、晶体棒的最佳长度以及锥形腔最佳锥度.本文的工作为实现太阳光直接抽运2μm激光输出做了理论上的准备. 相似文献
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报道了一种稳定的高功率双共振2?μm 光参量振荡器(OPO). 该OPO使用调Q的线偏振全固态Nd∶YAG激光器作为抽运源,利用双棒串接补偿热致双折射和双Q开关正交放置技术提高了抽运源的输出功率和光束质量,通过腔内抽运单块KTP晶体实现了稳定的高功率2?μm 激光输出. 在调Q频率为5?kHz时,得到了295 W的2?μm 激光输出. 研究了OPO输出功率同KTP晶体温度和声光Q调制频率的关系,并测量了在29W时2?μm激光的功率稳定性. 在1 h内该OPO的功率起伏小于1.4%.
关键词:
光参量振荡器
2?μm激光器
KTP晶体
双共振 相似文献
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提出一种简单的理论模型,并通过数值模拟详细研究了可调谐光纤环形腔激光器的输出特性随掺铒光纤长度、输出耦合比、抽运功率、腔内损耗等参量的变化关系.理论分析得到,通过参量优化可以实现在铒离子增益范围内超过130nm带宽(1500—1630nm)的激光输出.实验获得了100nm带宽(15185—16185nm)的可调谐激光输出,激光器输出功率高,信噪比在大部分可调范围内高于60dB,实验结果与理论分析符合得较好
关键词:
掺铒光纤
光纤环形腔激光器
可调谐
光纤珐布里珀罗滤波器 相似文献
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掺Er3+光纤环腔激光器的初步研究 总被引:5,自引:1,他引:4
本文报道采用环形腔使用偏振灵敏性光纤隔离器(P-SensitiveISO)构成的掺Er3+光纤激光器的激光输出特性研究结果.用976nm激光作为泵浦激光获得了0.42mW最大功率、中心波长1.5287μm的激光输出,阈值泵浦功率17mW.在改变腔内光纤偏振控制器(PC)的状态时,输出激光光谱分裂为二个分立的峰值,波长分别为1.5317μm和1.5502μm. 相似文献
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Dependence of two-beam coupling gain and phase-shift of the signal beams on the frequency detuning for a coupled unidirectional ring resonators based on non-degenerate two-wave mixing in the photorefractive crystals have been investigated in details. The effects of various parameters characterizing the photorefractive medium such as frequency detuning, absorption strength, two-beam energy coupling strength and pump intensity of the external laser beams, on the two-beam coupling gain and phase-shift of the signal beams for a coupled UPRR have also been studied in details. It has been found that the photorefractive gain of the signal beam in the primary cavity of the coupled UPRR can be enhanced to the higher order by taking the lower value of the frequency detuning of the primary cavity which could exist at much lower value of the absorption strength of the crystal B. This higher value of photorefractive gains in the cavities are responsible for the strong coupling between the modes of the oscillations of the coupled UPRR. 相似文献
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Y. J. Chen Y. F. Lin X. H. Gong H. M. Zhu Z. D. Luo Y. D. Huang 《Applied physics. B, Lasers and optics》2010,98(1):55-60
End-pumped by a single-stripe 805-nm diode laser, a maximum continuous-wave output power of 290 mW with slope efficiency of
42% and 90 mW with slope efficiency of 44% around 2 μm were achieved in a 1.6-mm-thickness, unprocessed 7.2 at.% Tm3+:BaGd2(MoO4)4 cleavage plate in a hemispherical and plano–plano cavities, respectively, when the absorbed pump power was 830 mW. The dependence
of the polarization of output laser on the output coupler transmission was investigated. The influence of upconversion on
the laser performance was analyzed. The results show that the unprocessed Tm3+:BaGd2(MoO4)4 cleavage plate is a promising 2-μm laser gain medium pumped by diode laser around 808 nm. 相似文献
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谐振腔因其具有选频功能而在集成光学领域具有广泛的应用. 通过两个光子晶体环形腔、四个不同尺寸的光子晶体微腔及波导之间的耦合, 实现了1310 nm, 1550 nm, 1600 nm和1650 nm 四个波长的波分解复用.时域有限差分法模拟分析的结果表明, 仅仅通过调制输出波导边缘介质柱的半径, 即可使四个波长的输出效率均达到90%以上. 所设计的器件不但效率高, 而且尺寸小(约为12 μ m× 17 μ m), 在未来的光通信领域中具有潜在的应用价值. 相似文献
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数值模拟并分析了以GaSe晶体为例对光学差频产生太赫兹(THz)波的特性.结果表明:当THz波长为227.5 μm,晶体长度为26.3 mm时,产生THz波功率达到增益饱和,在增益饱和点输出最高峰值功率可以达到945 W.由于晶体吸收的影响,THz波的增益饱和区是输出功率的非稳定区,而THz波的输出稳定区位于增益饱和区之后,在稳定区的THz波稳定性取决于抽运光的稳定性.当THz波波长为227.5 μm时,达到稳定区所需晶体长度为37.9 mm,此时THz波输出峰值功率可以达到735 W.
关键词:
光学差频
太赫兹辐射
稳定性 相似文献
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A BaTiO3 crystal was used to amplify an image illuminated by an Ar-laser. The amplification mechanism is two-wave mixing in an electrooptic crystal, usually called dynamic holography. We achieved gain factors of 4000 with pump powers of 150 mW and holographic resolution. As the interaction between signal and pump wave is not effected through excited states of the crystal, the amplification process is virtually noise free. This has to be traded in with slow response, 0.1-1 s. To demonstrate the high optical quality of the amplifier, it was incorporated in a ring resonator as gain medium. It was possible to excite pure discrete transversal modes of higher order. That reveals the high optical homogeneity of the crystal over the mode cross-section of > 1 mm. The coupling process of the pump with the two counter-propagating waves forming the standing resonator wave is not symmetric. Consequently a travelling wave develops in the resonator. 相似文献
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Ramzia Salem A. M. Al-Mansoori M. H. Hizam H. Mohd Noor S. B. Mahdi M. A. 《Laser Physics》2011,21(2):389-394
A multiwavelength laser comb using 2.49 m Bismuth-oxide erbium-doped fiber (Bi-EDF) with different lengths of large effective
area fiber (LEAF) in a ring cavity configuration is realized. The Bi-EDF is used as the linear gain medium and LEAF is used
as the non-linear gain medium for stimulated Brillouin scattering. Out of the four different lengths, the longest length of
25 km LEAF exhibits the widest tuning range of 44 nm (1576 to 1620 nm) in the L-band at 264 mW pump power and 5 mW Brillouin
pump power. In addition, a total of 15 output channels are achieved with total average output power of −8 dBm from this laser
structure. All Brillouin Stokes signals exhibit high peak power of above −20 dBm per signal and their optical signal-to-noise
ratio of greater than 15 dB. 相似文献
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We report a continuous-wave (CW) mid-infrared singly resonant optical parametric oscillator (SRO) based on periodically poled
MgO-doped LiNbO3 (PPMgLN) pumped by a high power, single frequency fiber laser in master oscillator-power amplifier (MOPA) configuration at
1.064 μm. Using four-mirror ring OPO cavities, at the PPMgLN’s grating period of 30.5 μm and the temperature of 23°C, we achieved
the maximum idler output power of 7.2 W at 3.4 μm when the pump power was 52.8 W. The total power-conversion efficiency from
the pump to the idler in this experiment is about 13.6%, and corresponds to ∼44% of quantum-limited performance. 相似文献
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We demonstrate fiber distributed feedback (DFB) lasers using Raman gain in two germanosilicate fibers. Our DFB cavities were 124 mm uniform fiber Bragg gratings with a π phase shift offset from the grating center. Our pump was at 1480 nm and the DFB lasers operated on a single longitudinal mode near 1584 nm. In a commercial Raman gain fiber, the maximum output power, linewidth, and threshold were 150 mW, 7.5 MHz, and 39 W, respectively. In a commercial highly nonlinear fiber, these figures improved to 350 mW, 4 MHz, and 4.3 W, respectively. In both lasers, more than 75% of pump power was transmitted, allowing for the possibility of substantial amplification in subsequent Raman gain fiber. 相似文献
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近年来,直接液体冷却薄片激光器因其体积功率比小,热管理能力强等优势而成为研究热点.本文建立了一套直接液体冷却薄片激光器波前畸变的分析方法.应用该方法研究了直接液体冷却薄片激光器中抽运光均匀性对光束波前畸变的影响.计算分析了均匀性为92%, 80%和70%,且总的抽运功率不变时,激光器高阶像差分布情况.随着均匀性逐渐减弱,激光器中高阶像差逐渐增强,低阶像差量基本保持不变.实验中,设计加入波导和未加入波导结构,构建了均匀性为92%和70%的抽运光分布,分别测量了两种情况下的波前抖动情况以及波前畸变分布,抽运功率为5 k W时,测量获得了整个增益模块的光程差高阶分量(OPDH),其畸变量均方根(RMS)值为0.66μm和0.79μm,实验结果和理论分析结果基本趋势一致. 相似文献