共查询到20条相似文献,搜索用时 62 毫秒
1.
从双包层光纤激光器的速率方程出发,得到了光纤中泵浦光与激光的功率分布、输出功率与泵浦功率的关系、腔镜反射率及光纤长度对输出功率的影响。研究结果表明:输出激光功率与光纤长度及后腔镜反射率有很强的依赖关系,存在一个输出功率最大的最佳光纤长度。后腔镜反射率越大,输出激光功率越小;当光纤长度较短时,在输出端放置反射镜使泵浦光高反射,可以提高输出功率和效率。通过对端面泵浦掺Yb3+双包层光纤激光器进行理论分析和实验研究,得到输出激光的中心波长为1088.3nm,斜率效率为33.7%,最大输出功率为1.75W。 相似文献
2.
对掺钕双包层光纤放大器中抽运光和信号光沿光纤传播的功率分布进行了数值模拟,以808nm半导体激光器为抽运源,掺钕双包层保偏光纤为增益介质,对种子注入主振荡光纤放大器进行了理论分析和实验研究.利用实验室自制的皮秒锁模激光器为种子源,注入1064nm皮秒锁模脉冲,获得了稳定的放大脉冲.小信号时的放大倍数为300(增益为25dB),获得了平均功率5W的皮秒脉冲.同时利用TDS5104型示波器探测信号光放大前后的波形,并用光谱分析仪得到输出脉冲激光的光谱图.
关键词:
光纤放大器
掺钕保偏光纤
种子注入
反向抽运 相似文献
3.
4.
LD泵浦瓦级单模高掺铒中红外光纤激光器(英文) 总被引:1,自引:1,他引:0
中红外激光在激光医疗、激光光谱学和红外对抗等领域有着广泛的应用前景.为了获得结构紧凑、便携性好的中红外激光源,采用975nm半导体激光器泵浦高掺铒氟化物双包层光纤实现了2.8μm的中红外光纤激光输出.将光纤耦合输出的中心波长为975nm的半导体激光,经过消像差非球面透镜系统耦合进双包层光纤,激光谐振腔由高反镜和具有4%菲涅耳反射率的光纤端面组成,当注入到增益光纤的泵浦功率高于0.37 W时,获得了中红外激光输出.实验结果表明:中红外光纤激光器中心波长为2.785μm,谱宽0.9nm;工作阈值为0.37W,最大输出功率为0.98W,斜率效率为17%,激光工作模式为单模.利用高掺杂浓度铒离子间的能量转移上转换,获得了高效率瓦级单模中红外光纤激光输出. 相似文献
5.
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
6.
研究了一种混合掺铒/铒镱共掺光纤放大器,用掺铒光纤放大器作为输入信号的预放大器,用铒镱共掺双包层光纤放大器作为主放大器。掺铒光纤放大器采用20m长掺铒光纤作为增益介质,采用最大输出功率318mW的单模半导体激光器二极管作为泵浦源,预放大器获得的最大输出功率是113mW。铒镱共掺光纤放大器采用14m长铒镱共掺双包层光纤作为增益介质,采用2个915nm多模半导体激光二极管作为泵浦源,在输入信号功率为10mW、信号波长1555nm时,混合光纤放大器获得了最大输出功率为32.04dBm,即1.6W,与此相应的混合光纤放大器的光-光转换效率为18.5%。 相似文献
7.
以光纤光栅为谐振腔搭建了波长为1020 nm的光纤激光器,并通过两级级联放大获得了590 mW的最大输出功率. 利用获得的波长为1020 nm的激光进行了波长为1064 nm种子光同带抽运放大,实验研究了不同增益光纤长度时放大器的输出功率和转换效率. 当增益光纤长度为8.5 m时,放大器最大输出功率为385 mW,斜率效率为81%. 进行了波长为976 nm的半导体激光器直接抽运波长为1064 nm种子光的实验. 在增益光纤长度最优时,其斜率效率为56.4%. 实验结果表明,同带抽运方式比传统抽运方式具有更高的转换效率. 研究结果可为波长为1020 nm的激光高功率放大和波长为1064 nm的光纤激光高功率同带抽运放大提供一定的参考.
关键词:
同带抽运
光纤放大器
斜率效率 相似文献
8.
9.
10.
主振荡功率放大(main oscillation power amplification, MOPA)结构由于其光束质量良好和参数可调的优点,已成为高功率光纤激光器的主流设计之一。为了改善高功率掺镱光纤激光器(ytterbium-doped fiber laser, YDFL)的输出性能,提高系统的光-光转换效率,文中报道了一台基于915 nm泵浦激光器和双包层掺镱光纤(ytterbium-doped fiber, YDF)的MOPA结构全光纤高功率激光器。该高功率光纤激光器由电调制激光二极管(laser diode, LD)泵浦的种子激光器和掺镱光纤放大器(ytterbium-doped fiber amplifier, YDFA)组成。连续光(continuous wave, CW)工作模式下,激光种子源经过YDFA后,实现了中心波长为1 069.96 nm的激光输出,最大平均输出功率可达945.9 W,MOPA激光器整机的斜率效率高达74.12%,具有良好的稳健性。该研究方案对研制高功率MOPA光纤激光器具有参考意义。 相似文献
11.
中介绍了S波段低温低噪声放大器的研制.在15K左右的环境温度下,300MHz带宽内,实测放大器的等效噪声温度≤4.6K,增益≥35dB,增益平坦度≤1.0clB,输入、输出回波损耗≤-20dB.它已经成功运用于射电天文等领域. 相似文献
12.
13.
Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier 下载免费PDF全文
A theoretical analysis of noise in a high-power cascaded fiber amplifier is presented. Unlike the noise theory in low power communication, the noise of a high power system is redefined as the leaked output energy between pulses with coherent beat noise uncounted. This definition is more appropriate for high power usage in which the pulse energy receives more attention than the pulse shape integrity. Then the low power pre-amplifying stages are considered as linear amplification and analyzed by linear theory. In the high-power amplification stages, the inversion is assumed to recover linearly in the time interval between pulses. The time shape of the output pulse is different from that of the input signal because of different gains at the front and back ends of the pulse. Then, a criterion is provided to distinguish the nonlinear and linear amplifications based on the signal-to-noise ratio (SNR) analysis. Then, an experiment that shows that the output SNR actually drops off in nonlinear amplification is performed. The change in the noise factor can be well evaluated by pulse shape distortion. 相似文献
14.
An efficient fluoride-based thulium-doped fiber amplifier (TDFA) is theoretically demonstrated using a double-pass scheme. A reflector is incorporated in the double-pass TDFA to allow double propagation of the test signal in the gain medium and thus improve the gain of the TDFA. The small signal gain improvement of more than 15 dB is obtained in the 1465 nm region. A gain as high as 42 dB is obtained in this region with 300 mW of 1050 nm pump using 20 m of thulium-doped fiber. However, a noise figure penalty of approximately 1 dB is also obtained in this wavelength region. Differential equations are solved using the Runge-Kutta method in the theoretical analysis. The theoretical result is in agreement with the experimental result. 相似文献
15.
16.
《中国物理 B》2021,30(9):94206-094206
A high efficiency compact Yb:KGW regenerative amplifier using an all-fiber laser seed source was comprehensively studied. With thermal lensing effect compensated by the cavity design, the compressed pulses with energy of 1 m J at 1 k Hz and 0.4 m J at 10 k Hz in sub-400-fs pulse duration using chirped fiber Bragg grating(CFBG) stretcher were demonstrated.A modified Frantz–Nodvik equation was developed to emulate the dynamic behavior of the regenerative amplifier. The simulation results were in good agreement with the experiment. Numerical simulations and experimental results show that the scheme can be scalable to higher energy of multi-m J, sub-300 fs pulses. 相似文献
17.
Based on dual-order stimulated Raman scattering (SRS) of a single 1395 nm Raman fiber laser in 75 km single mode fiber and its corresponding dispersion compensation module, a hybrid Raman/Erbium doped fiber amplifier (EDFA) for long wavelength band (L-band) amplification is realized by inserting a segment of EDF within the span. By comparing the performance of gain and noise in four hybrid amplifiers with different span configurations, we find that the distribution of the secondary L-band amplification obtained from the EDF along the link has a great influence on the performance of the hybrid amplifier. Both gain and noise performance of hybrid amplifier can be improved significantly by optimizing the location of the EDF. Moreover, we can extend the flat gain bandwidth from L-band to central wavelength band (C-band) plus L-band by recycling the residual first-order SRS to pump a segment of EDF with proper length. 相似文献
18.
M. H. Ali M. Z. Jamaludin M. H. Al-Mansoori A. K. Abass T. F. Al-Mashhadani 《Fiber and Integrated Optics》2013,32(3):131-144
AbstractThis study demonstrates simulation and experimental validation of a wideband serial hybrid Raman/erbium-doped fiber amplifier. Two configurations are adopted; in type A, a Raman amplifier is the first stage, and in type B, an erbium-doped fiber amplifier is the first stage. At low input signal power, the average gain level is 20 dB with a flat gain bandwidth of 40 nm for both configurations. The noise figure in type B is dominated by the erbium-doped fiber amplifier and produces lower values and flatter spectra than in type A. The gain of the proposed hybrid amplifiers is affected more by the second amplification stage. 相似文献
19.
20.
Soorena Zohoori 《Fiber and Integrated Optics》2018,37(1):37-56
In this paper, a new low-power optical receiver front-end is proposed in 90 nm CMOS technology for 5 Gb/s AApplications. However, to improve the gain-bandwidth trade-off, the proposed Trans-Impedance Amplifier (TIA) uses an active modified inverter-based topology followed by a common-source amplifier, which uses active inductive peaking technique to enhance the frequency bandwidth in an increased gain level for a reasonable power consumption value. The proposed TIA is analyzed and simulated in HSPICE using 90 nm CMOS technology parameters. Simulation results show a 53.5dBΩ trans-impedance gain, 3.5 GHz frequency bandwidth, 16.8pA/√Hz input referred noise, and 1.28 mW of power consumption at 1V supply voltage. The Optical receiver is completed using three stages of differential limiting amplifiers (LAs), which provide 27 dB voltage gain while consume 3.1 mW of power. Finally, the whole optical receiver front-end consumes only 5.6 mW of power at 1 V supply and amplifies the input signal by 80 dB, while providing 3.7 GHz of frequency bandwidth. Finally, the simulation results indicate that the proposed optical receiver is a proper candidate to be used in a low-power 5 Gbps optical communication system. 相似文献