共查询到18条相似文献,搜索用时 156 毫秒
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高功率窄线宽光纤放大器的输出功率主要受限于受激布里渊散射(SBS)效应,通过相位调制进行线宽展宽可以有效抑制SBS效应.基于窄线宽光纤放大器中的SBS动力学模型,研究了正弦信号、白噪声信号和伪随机编码信号(PRBS)对窄线宽光纤放大器光谱特性与SBS阈值的影响.研究发现,采用不同信号进行相位调制时,调制频率和调制深度等参数对调制后激光光谱的谱线间隔、谱线数目与光谱平整度的影响存在较大差异,进而影响放大器的线宽特性和SBS阈值.通过对比分析,给出了调制信号的类型选择和参数优化原则,能够为窄线宽光纤放大器的相位调制系统设计提供参考. 相似文献
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为了获得不同间隔双波长信号输出,提出一种基于受激布里渊效应产生双波长激光的实验装置,利用不同间隔双波长输出信号进行拍频实验可获得可调的微波信号输出;利用一段10 km长普通单模光纤(SMF)作为布里渊增益介质,一个线宽为5 kHz分布反馈激光器(DFB)作为布里渊抽运源,一段未泵浦的保偏掺铒光纤用作饱和吸收体抑制边模,通过改变未泵浦保偏掺铒光纤的长度,可获得不同间隔输出的双波长光纤激光器,实验获得波长间隔为0.170 nm和0.085 nm的激光信号输出,分别对应20 GHz和10 GHz的微波信号。 相似文献
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由于受到受激布里渊散射(SBS)等非线性效应的限制,单频激光放大器的功率在百瓦量级,以非单频激光多波长激光作为种子源能够有效地抑制SBS并提高放大器功率.与单频激光相干合成相比,非单频率、多波长激光的相干合成有望将输出激光功率成量级地提高.基于随机并行梯度下降(stochastic parallel gradient descent,SPGD)算法,实现了四波长激光的相干合成.在系统闭环时,四路多波长激光合成后的主瓣能量能够提高3倍,达到理想值的75%.验证了多波长、非单频激光相干合成的可行性,为高功率相干合成的发展提供了新的途径. 相似文献
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《光学学报》2017,(1)
将多波长激光光源技术引入瑞利布里渊光时域分析系统,其中抑制载波的微波调制多波长脉冲基底1阶边带会在传感光纤中产生多波长背向瑞利散射;将该散射光作为探测光与多波长传感脉冲发生受激布里渊散射(SBS)作用,可有效地提高光纤SBS阈值和SBS作用效率,进而提高系统信噪比和布里渊频移的测量精度。分析了相位调制器产生多波长激光光源的原理以及利用电光强度调制器产生作为探测光的多波长斯托克斯和反斯托克斯激励光的原理,建模分析了多波长瑞利布里渊光时域分析系统原理,给出了系统信噪比与波长数关系的表达式;搭建了单波长和三波长光纤SBS阈值测量系统及瑞利布里渊光时域分析系统,测量了光纤的SBS阈值和系统性能。实验结果表明,当单波长与三波长瑞利布里渊光时域分析系统的传感脉冲宽度为100ns,峰值功率为100mW,单个波长的脉冲基底功率约为1.3mW,传感光纤长度为2.4km时,三波长较单波长系统的光纤SBS阈值和信噪比分别提高了3倍和2.83倍,在2km光纤内布里渊频移波动由33.4 MHz降至15.6 MHz。 相似文献
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高功率单频激光在激光雷达、光谱学、精密测量等领域具有广阔的应用前景.采用中心波长为1064 nm、光谱线宽为20 kHz、偏振消光比(PER)高于20 dB的单频线偏振分布式反馈光纤激光器做种子源(尾纤输出功率约为10 mW),利用种子注入主振荡功率光纤放大技术,通过两级级联放大实现了128 W高功率单频、线偏振、近衍射极限单模连续激光输出.主放大器光-光效率达到83%,PER高于12 dB.采用分段温控技术有效地提高了光纤中的受激布里渊散射(SBS)阈值,实验中未观察到明显的放大自发辐射和SBS现象,进
关键词:
掺Yb光纤放大器
主振荡功率光纤放大
单频
线偏振 相似文献
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Wenbo Du Xiaolin Wang Yanxing Ma Jiajian Zhu Xiaolin Dong Pu Zhou Xiaojun Xu Bohong Shu 《Optics & Laser Technology》2012,44(1):247-250
Seeding high power fiber amplifier employing multi-tone fiber laser is an effective approach to suppress stimulated Brillouin scattering (SBS). In this paper, a two-stage 1064 nm high power fiber amplification system was set up. Single-, two- and three-tone fiber lasers were employed. SBS threshold powers and maximum output powers of the multi-tone cases are enhanced compared with the single-tone case. The multi-tone amplifiers also show comparable optical-to-optical efficiency to the single-tone amplifier. To demonstrate and validate coherence property of the two multi-tone fiber amplifiers, the output laser beams of the amplifiers were self-interfered in our self-made coherent beam combining system. The laser beams of the multi-tone cases showed good coherence property comparable to the single-tone case, which implied that the high power output laser light of the multi-tone fiber amplifiers could be used for coherent beam combining. 相似文献
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窄线宽纳秒脉冲光纤拉曼放大器在非线性频率变换、遥感探测和量子信息等领域有广泛的应用前景.综合考虑受激拉曼散射(stimulated Raman scattering,SRS)、受激布里渊散射(stimulated Brillouin scattering,SBS)、自相位调制(self-phase modulation)和交叉相位调制(cross-phase modulation)等非线性效应,建立了窄线宽纳秒脉冲光纤拉曼放大器的非线性动力学模型.仿真分析了放大器中脉冲激光的时频演化特性,对比研究了抽运脉冲宽度、光纤长度和信号光功率等因素对放大器性能的影响.研究发现,上述因素会影响放大器的SRS阈值、SBS阈值、输出激光线宽、激光转换效率等.例如,当脉冲宽度为800 ns时,SBS随着抽运功率的增加而发生,限制了激光功率的提升;减短抽运脉宽可以抑制SBS,但是输出激光的线宽易于展宽到数百MHz以上;增加光纤长度可以获得更低的SRS阈值和更高的转换效率,但是SBS效应和光谱展宽程度也随之增强.系统搭建中需要平衡各非线性效应,选择合适的系统参数.研究内容可以为窄线宽纳秒脉冲光纤拉曼放大器的设计搭建提供参考. 相似文献
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Jinyong Leng Shengping Chen Wuming Wu Jing Hou Xiaojun Xu 《Optics Communications》2011,284(12):2997-3003
High power operation of single-frequency Raman fiber amplifiers is usually limited by the onset of stimulated Brillouin scattering. A theoretical investigation on single-frequency Raman fiber amplifier limited by stimulated Brillouin scattering is presented in this paper, based on the intensity equations combining stimulated Brillouin scattering and stimulated Raman scattering. A combination of methods is proposed to increase the output power of single-frequency Raman fiber amplifier. These methods include applying a suitable pump scheme according to the fiber length and seed signal power, using short gain fibers, utilizing a multiple-stage scheme and providing suppression of stimulated Brillouin scattering. 相似文献
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We demonstrate a high-power single-frequency master oscillator power amplifier (MOPA) fiber laser.The central wavelength of the single-frequency fiber laser seed is 1 063.8 nm,with a linewidth narrower than 20 kHz and output power of 120 mW.By using two-stage amplification,a single-frequency fiber laser with an output power of 122 W is obtained,and the optical-optical conversion efficiency is 72%.No significant amplified spontaneous emission (ASE) or stimulated Brillouin scattering (SBS) is observed.The output power can be further increased by launching more pump power. 相似文献
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Stimulated Brillouin Scattering Enhancement Factor Improvement in a 11.6-GHz-Linewidth 1.5-kW Yb-Doped Fiber Amplifier 下载免费PDF全文
《中国物理快报》2016,(7)
The stimulated Brillouin scattering(SBS) threshold enhancement factor in a pure white noise linewidth broadening Yb-doped fiber amplifier(YDFA) with a short large mode area fiber is theoretically and experimentally studied.We demonstrate a 1064.08 nm,11.6 GHz linewidth,1.5kW output power YDFA with an SBS threshold enhancement of ~57(26 W SBS threshold with single frequency seed).The output beam is near-diffraction limited with a beam quality factor of M~2 = 1.15 and a slope efficiency of up to 87%.No SBS or stimulated Raman scattering effects are observed in the whole power range.Further power scaling is limited by the available pump power in our system. 相似文献
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提出利用布里渊放大技术对水中微弱光散射信号进行频谱选择性光放大的方法.根据频率失谐布里渊放大理论模型,分析了Stokes种子光的线宽及频率失谐对布里渊放大的影响,研究了种子光放大率随水温及其功率密度变化的规律,理论和实验符合较好.研究表明,相同频率失谐时,线宽较大的种子光信号放大率更高.选取20℃的CS2为放大介质,不同温度海水产生的Stokes种子光信号均能得到有效的布里渊放大.相同抽运光功率密度情况下,种子光的放大率随其功率密度的增加而减小,当种子光能量约为5μJ时,其放大率达102以上. 相似文献
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X. Wang J. Leng P. Zhou Y. Ma X. Xu Z. Liu 《Applied physics. B, Lasers and optics》2012,107(3):785-790
We demonstrate simultaneous spectral and coherent combining of a three-tone nine-channel all-fiber amplifier array with a total output power of 1.8 kW in a master-oscillator power-amplifier (MOPA) configuration. Three single-frequency seed lasers are spectrally combined and employed as a master oscillator for an all-fiber power amplifier array, which provides robust performance on suppressing of the stimulated Brillouin scattering effect. Three-stage power amplifiers are employed to scale the power from tens of mW to more than 300 W. Active phase locking of the nine-channel spectrally combined amplifiers is implemented by using the stochastic parallel gradient descent algorithm. In the experiment, a nine-channel spectrally combined MOPA array is coherently combined with a total output power of 1.8 kW. The power in the main lobe in closed loop is 4.6 times the value in open loop, and an average visibility of more than 85 % of the interference pattern at the receiving plane is obtained. By only adding pump power in the main amplifiers, the total power of the array could scale up to more than 3 kW. 相似文献