共查询到19条相似文献,搜索用时 140 毫秒
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波长无啁啾调谐窄线宽掺Yb3+双包层光纤激光器 总被引:1,自引:0,他引:1
用相位掩模法, 在圆形掺Yb3+双包层光纤上制作了Bragg光纤光栅,并用它作为双包层光纤激光器的输出腔镜, 在光栅反射中心波长1055.2 nm位置得到了窄线宽的激光输出, FWHM为0.271 nm, 信噪比约为40 dB.这种结构的双包层光纤激光器, 在双包层增益光纤和后腔镜间没有连接损耗, 减小了双包层光纤激光器体积. 用自行制作的等强度梁对作为输出腔镜的光纤光栅做双向应力调谐, 实现了激光波长无啁啾调谐输出, 调谐范围1051.1~1060.04nm,调谐量达8.9nm, 调谐过程中激光3 dB线宽基本无变化. 相似文献
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双包层光纤光栅选频双包层光纤激光器 总被引:7,自引:2,他引:5
双包层光纤激光器中多采用法布里珀罗(F-P)线形腔结构,谐振腔为一只二向色镜和光纤端面菲涅耳反射镜(反射率约为4%)构成,这属于一种有缺陷的腔结构,其稳定性不好,产生激光的波长很难得到有效控制,后腔镜不能精确选择激光器的输出波长,激光器的输出谱线较宽。在某些对激光波长有明确要求的应用中,该结构会受到限制。采用布拉格光纤光栅作腔镜,利用其窄带滤波特性,可以得到窄线宽的激光输出,目前报道的作为腔镜的布拉格光纤光栅为在单包层光敏光纤上制作而成,然后分别将不同反射率的光纤光栅与双包层增益光纤熔接,这给腔镜与双包层光纤之间带来很大的耦合损耗,影响了激光器的功率输出。该文报道了用相位掩模法在双包层光纤芯上写入了布拉格光纤光栅,并把此光纤光栅做为后腔镜.对长度为10m、20m的D形掺Yb^3 双包层光纤激光器进行实验研究,在1058nm附近得到稳定的窄线宽激光输出,3dB带宽为0.329nm。激光器最大输出功率为570mW。最后对实验结果进行了理论分析。 相似文献
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设计出一种集可调谐带通滤波器、高精度环形滤波器和光纤环形镜于一体的全光纤复合腔结构可调谐单频窄线宽光纤激光器。采用980 nm半导体激光器作为抽运源,掺镱光纤在谐振腔内分别作为增益介质和可饱和吸收体,成功实现波长为1030~1090 nm稳定的宽谱可调谐单频窄线宽激光输出。当抽运光的抽运功率为300 mW时,在波长为1070 nm处得到的输出功率最大,为18.5 mW,斜率效率达到7.95%,持续1 h内没有出现跳模现象,功率不稳定性小于1%;当抽运功率为200 mW时,利用延迟自外差法测量线宽,得到波长调谐范围内的平均线宽为8.7 kHz,弛豫振荡频率为64 kHz。 相似文献
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《光学学报》2010,(3)
利用两种腔镜组合对XeF激光光谱进行了研究。在同一实验条件下,可同时获得B—X和C—A两种跃迁的激光输出,XeF(B—X)激光比XeF(C—A)激光早800 ns形成。详细研究了XeF_2初始分子数浓度对XeF激光光谱的影响,结果表明,低XeF_2分子数浓度条件不利于XeF(B—X)激光形成,随着XeF_2分子数浓度增高,B—X跃迁光谱呈现出多条分立谱线的特征。给出了两种腔镜组合条件下XeF(C—A)激光光谱,XeF(C—A)激光光谱特征是宽带连续谱,在光谱中可观察到Xe原子的吸收线。选用合适的腔镜组合可实现XeF(C—A)激光的窄带输出,带宽约为7 nm。 相似文献
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宽条形半导体激光器广泛应用于激光泵浦、激光加工等领域。针对宽条型半导体激光器输出光谱宽、调谐范围小的问题,采用衍射效率分别为28%和55%的反射式衍射光栅作为反馈元件构建了宽条形970 nm波长光栅外腔半导体激光器。研究了Littrow结构激光器参数对其性能(调谐范围、功率、阈值电流、线宽)的影响。实验结果表明,通过结构优化可得到窄线宽可调谐激光输出,适当地提高温度和使用较高衍射效率的光栅可增加激光器调谐范围,并且较高衍射效率的光栅可降低激光器的阈值电流。基于S偏振入射方式的光栅外腔激光器最大可实现27.87 nm的波长调谐范围,光谱线宽压窄至0.2 nm,输出功率可达1.11 W。 相似文献
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焦耳量级光抽运XeF蓝绿激光器 总被引:4,自引:0,他引:4
阐述了焦耳量级XeF(C-A)激光器的总体设计及抽运源辐射能力的测试方法,分析了XeF(C-A)激光特性参量与XeF2初始浓度、输出透过率以及气体成分之间的关系。抽运源采用紧凑型结构,有效地减小了放电回路面积,使回路电感降低到330nH,从而使放电沉积效率达到74%,抽运源平均沉积功率密度达到12MW/cm。利用分幅相机拍摄了XeF2光解离波并对抽运源辐射能力进行了诊断,抽运源辐射在140~170nm波段的光子出射通量达到5×1023s-1.cm-2,辐射亮度温度高于25kK。激光器有效激活长度80cm,采用平凹谐振腔,激光器获得了稳定的焦耳级能量输出,最大输出能量2.5J,总转换效率0.1%,激光脉宽约为700ns。 相似文献
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S. Mory H.J. Patzold A. Rosenfeld S. Polze G. Korn J. Tilch 《Optics Communications》1979,29(2):201-203
A resonator arrangement for a cw-dye laser with a holographic grating for spectral narrowing and spectral variation is described. The grating is used at the grazing incidence. With this simple design we have got linewidth smaller than 0.01 nm. 相似文献
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设计了用于脉冲功率装置的4 MV水介质同轴 三平板型输出开关。该脉冲功率装置将由24路相同的独立模块组成,每路模块由Marx发生器、中间储能器、激光触发气体开关、脉冲形成线、水介质脉冲输出开关、脉冲传输线等组成。水介质脉冲输出开关是同轴 三平板结构水介质多通道自击穿开关,由输入输出电极、预脉冲屏蔽板和连接部件组成。进行了有预脉冲屏蔽板结构和无预脉冲屏蔽板结构的自击穿水开关实验研究。有预脉冲屏蔽板结构开关的输入、输出电极都是半球电极,直径分别是8 cm和5 cm;无预脉冲屏蔽板结构开关为针 板结构,输入电极为平板电极,输出电极为直径3 cm的电极棒。Marx发生器充电70 kV,开关的击穿电压为3 MV,放电电流为450 kA。在3 MV等级的击穿电压下,有预脉冲屏蔽板结构开关的抖动约6 ns,没有预脉冲屏蔽板结构开关的抖动减小至3 ns。 相似文献
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X. J. Zhu C. H. Wang S. X. Liu G. J. Zhang D. F. Hu C. Y. Zhu J. J. Wang E. X. Fang 《Laser Physics》2011,21(9):1625-1628
A tunable, low-repetition rate, all-normal-dispersion Yb-doped fiber laser (YDFL) that is passively mode locked based on a
phase shifted long period fiber grating (PS-LPFG) is demonstrated and proposed. The mode-locking mechanism of the laser is
based on nonlinear polarization evolution (NPE). Using a PS-LPFG as the spectral filter in the laser cavity, the mode-locked
output wavelength can be tuned continuously and smoothly over a spectral range of 10 nm, which is the first time implementation
of a tunable giant chirped pulse with all-fiber format bandpass filter in YDFL. The maximum output pulse energy is 38.9 nJ
at the repetition rate of 2.499 MHz. 相似文献
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Hyungbin Son 《光谱学快报》2013,46(2):79-83
The authors present an external cavity diode laser with high spectral purity for tunable laser Raman spectroscopy. To achieve high spectral purity required for Raman spectroscopy, a laser cavity utilizing a volume phase holographic grating, which has very low stray light, is developed and the first-order diffracted beam from the grating is taken as the output. Raman signals can be obtained from common samples with only a commercial laser rejection filter, greatly simplifying a tunable Raman instrument. 相似文献
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A compact self-seeded pulsed tunable laser is described. Its optical cavity comprises a diffraction grating, operating at
a grazing angle of incidence as a spectral selector and narrow-band spectral gate. The grating couples two partially overlapping
laser channels: a highly selective master laser and a nonselective slave laser. Due to the implemented efficient intracavity
self-seeding the laser emits spectrally pure single-longitudinal-mode radiation at two independently tunable wavelengths,
with an efficiency and output energy that are typical for nonselective lasers. Results of the experimental investigation of
the laser’s output characteristics are presented.
Received: 12 March 2001 / Revised version: 10 December 2001 / Published online: 7 February 2002 相似文献
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V. A. Akulov D. M. Afanasiev S. A. Babin D. V. Churkin S. I. Kablukov M. A. Rybakov A. A. Vlasov 《Laser Physics》2007,17(2):124-129
A compact Yb-doped fiber laser (YDFL) based on a tunable fiber Bragg grating (FBG) with ~6 W output power and ~45 nm tuning around 1080 nm has been developed. The laser output power and its spectral width (~0.15 nm) do not change significantly at the tuning, while the FBG reflection coefficient increases with an increase in FBG compression. It has been shown that this increase is due to stress-induced changes in the FBG’s refractive-index modulation amplitude. Intracavity frequency doubling in the YDFL has also been performed. About 0.4 W of green radiation with tuning in the range 540–548 nm has been achieved with a KTP nonlinear crystal. 相似文献