共查询到20条相似文献,搜索用时 15 毫秒
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8字形主被动锁模掺Er3+光纤激光器 总被引:6,自引:0,他引:6
在理论上分析了利用非线性光学环形镜作为等效可饱和吸收体压缩脉冲进行锁模的物理机制。利用8字形主被动混合锁模的结构在调制频率2.498749GHz下,在1.543μm处获得了12ps的锁模脉冲输出,对应谱宽0.22nm,时间脉宽积0.33。在抽运功率50mW情况下,输出脉冲平均功率3.715mW。在调制频率2.499344GHz、2.499114GHz和2.498999GHz时分别并获得了2~4阶幅度较为均衡的有理数谐波锁模脉冲序列。 相似文献
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抑制相位噪声实现主动锁模光纤激光器稳定工作 总被引:6,自引:0,他引:6
腔长漂移是引起主动锁模光纤激光器不稳定的一个主要原因。通过理论分析得出了主动锁模光纤激光器输出脉冲相位噪声和腔长漂移的关系,并采用抑制相位噪声的方法实现了主动锁模光纤激光器长达8小时的稳定工作。 相似文献
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Guoqing Chang Caiyun Lou Yuhua Li Yizhi Gao Bingkun Zhou 《International Journal of Infrared and Millimeter Waves》1999,20(12):2063-2074
The time-domain ABCD matrix formalism is based on the propagation of a Gaussian pulse which is characterized by the pulsewidth and chirp. In this paper, we will perfect this method and derive time-domain ABCD matrices for more optical devices. Especially, we extend this perfected theory to analyze the principle of passive mode-locking by reasonable approximation though, as we know, the output pulse generated from passive mode-locking fiber laser is of sech-shape. It is attractive because it can present a fairly apparent view to understand the mechanism of fiber lasers as well as analytic results to understand the pulse characteristics. 相似文献
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用半导体激光器作调制器的双波长可调谐锁模光纤激光器 总被引:3,自引:2,他引:3
提出一种用法布里—珀罗腔半导体激光器(F—PLD)作调制器,用线性凋啾光栅(LCFG)进行波长选择的双波长环形腔主动锁模光纤激光器。利用线性凋啾光栅在腔内的色散效应使两个波长的光脉冲通过饵光纤(EDF)时在时域上分开,从而威小了不同波长的光脉冲同时通过饵光纤时造成的竞争,因此可以在室温下获得波长间隔较小的稳定的双波长光脉冲输出。实验中成功地获得了重复频率约为2GHz,波长间隔为0.92nm的稳定双波长光脉冲,并通过调谐线性凋啾光栅中心波长的位置使激光波长可以在约3nm范围内调谐。 相似文献
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《中国物理快报》2016,(4)
An actively mode-locked Ho:YAG laser pumped by a diode-pumped Tm-doped fiber laser is reported.For the cw operation,we obtain the maximum output power of 3.43 W with a central wavelength 2022.2 nm at the maximum incident pump power of 11.4 W,corresponding to a slope efficiency of 34.5%.The beam quality factor M2 is 1.16,and the output beam is close to fundamental TEM_(00) In the case of the CWML operation,a stable pulse train is generated with an average output power up to 3.41 W with a slope efficiency of 34.3%at the incident pump power of 11.4 W and a pulse duration of 294 ps at a repetition rate of 81.92 MHz.In addition,the maximum single pulse energy is 41.6 n J. 相似文献
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We propose and demonstrate a Raman-assisted passively mode-locked Yb-doped fiber laser in a normal dispersion regime. A section of highly nonlinear fiber is adopted to enhance the nonlinearity to extend the bandwidth of the gain spectrum by the stimulated Raman effect. The mode-locked fiber laser emits a broad spectral bandwidth of 64 nm at the-20 dB level and a highly stable pulse operation with a signal-to-noise ratio of 77 dB. 相似文献
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在理论上详细分析了利用非线性光学环形镜(NOLM)来减小输出脉冲幅度波动,消除噪声并对脉冲进行压缩整形的物理机制。在主动锁模掺铒光纤环形激光器中(AHML-EDFL)接入一个非线性光学环形镜,形成结构新颖的主被动锁模掺铒光纤激光器(APHML-EDFL),利用非线性光学环形镜所具有的饱和吸收体功能,成功地制抑了4阶有理数谐波锁模(RHML)中较大的幅度噪声,在1GHz量级的调制频率下,由主被动锁模掺铒光纤激光器获产生重复频率为5.1GHz,幅度相当稳定的4阶有理数谐波锁模脉冲序列。 相似文献
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We demonstrate a diode-pumped cw mode-locked Nd:YAG by an acousto-optic mode locker. A mode-locked pulse with duration of 345 ps and output power of 12 W is obtained. The resonator design shows three advantages: a larger mode volume, high stability against thermal lens fluctuations, and excellent beam quality with TE00 mode. Different from previous active mode locking designs, we employ a frequency stabilizer and a phase-lock loop circuit to ensure the mode locking stable operation. 相似文献
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Multiwavelength Dispersion-Tuned Actively Mode-Locked Erbium-Doped Fibre Ring Laser with Gain Competition Suppression 下载免费PDF全文
Multiwavelength dispersion-tuned actively mode-locked erbium-doped fibre ring laser is demonstrated by incorporating a section of highly nonlinear fibre (HNLF) in the laser cavity. The HNLF and the time gate element (modulator) in the fibre laser successfully suppress the gain competition in the erbium-doped fibre, and thus enable multiwavelength operation. Simultaneous generation of 10 GHz pulses up to eight different wavelengths is achieved. Wavelength, spacing and modes number tuning are investigated by changing fibre cavity length, dispersion, and erbium-doped fibre amplifier power, respectively. 相似文献
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基于非线性偏振旋转锁模原理、非线性薛定谔方程和色散波干涉理论,建立了被动锁模光纤激光器的光谱分析模型.采用此模型进行数值仿真,研究了腔体长度、增益光纤长度和耦合输出比对光谱边带的影响.并分别采用13 m、16 m和26 m的腔长,0.5 m.1.5 m和3 m的掺铒光纤以及不同的耦合输出比进行了实验,对比了上述情况下激光器的输出光谱.实验与仿真结果表明.要抑制光谱边带,应尽最缩短腔长,适当增加增益光纤的长度和采用较低的耦合输出比.并保证激光器处在基阶锁模状态.理论模型的仿真结果与实验现象吻合较好.取3 m增益光纤、13 m腔长和10%的输出比,获得了光谱边带抑制较好、谱宽20.4 nm的锁模脉冲激光.重复频率为15.87 MHz.单脉冲能最约0.52 nJ,脉冲幅值和光谱谱宽分别存在约4%和2%的波动. 相似文献
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A simple scheme of switchable dual-wavelength passively mode-locked fiber laser is demonstrated. The laser can be flexibly switched among different mode-locked states simply by tuning the cavity loss while keeping all the other cavity parameters fixed. As the cavity loss increases, the mode-locked fiber laser operates at the long-wavelength, dual-wavelength, and short-wavelength states, successively. In addition, these states can be conveniently switched without losing the mode-locked operation and the switching process is reversible as the cavity loss decreases. The mechanism is qualitatively explained by the balance between the fiber gain and the cavity loss. 相似文献