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S波段光纤拉曼放大器中级联受激布里渊散射串扰的实验研究 总被引:2,自引:0,他引:2
研究了光纤激光器前向抽运的S波段分布式光纤拉曼放大器中级联的受激布里渊散射(SBS)串扰现象。用窄光谱带宽(<100MHz)的可调谐激光二极管作为信号源,通过S波段分布式光纤拉曼放大器,当被放大的信号功率超过单模光纤受激布里渊散射的阈值时,出现了前向受激布里渊散射,这是传导声波布里渊散射在光纤放大器中放大的现象。随着拉曼放大器抽运功率的提高,在斯托克斯区,出现了两阶受激布里渊散射线,在实验中观测到偶数阶的受激布里渊散射谱线功率大于奇数阶的布里渊一瑞利散射线。当进一步增加拉曼放大器的抽运功率,出现了前向级联的多阶受激布里渊散射现象,拉曼放大器的增益下降,被放大的信号功率转换为受激布里渊散射,噪声变大。受激布里渊散射的串扰破坏了拉曼放大器的特性,使拉曼放大器无法在密集波分复用光纤传输系统中使用,因此需要严格地控制入纤的信号功率和放大器的抽运功率。在实验中还观测到在光纤拉曼放大器中被放大的信号光和受激布里渊散射线两侧的伴线。 相似文献
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利用两种颜色的发光层制备了光谱稳定的高效混合WOLED。其中蓝光发光层用14%质量分数的BNE掺杂在BePP2中,橙光发光层用1%质量分数的Ir(bt)2(acac)掺杂在49.5%质量分数的NPB和49.5%质量分数的BePP2组成的混合主体中。在不利用任何光耦合技术的条件下,器件在亮度为100 cd/m2时,功率效率可以达到39 lm/W;当亮度提高到1 000 cd/m2时,效率仅发生轻微滚降至27.5 lm/W。器件的光谱稳定,亮度在1 000 cd/m2和10 000 cd/m2时,CIE坐标分别为(0.37,0.48)和(0.37,0.47)。良好的光谱稳定性归结于设计的双极性中间层平衡了其两侧激子的产生。 相似文献
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Solid-state blue and green light sources are desirablefor high-density optical storage, color displays, optoelec-tronics, and medical diagnostics[1-4]. Tm3+ is the moststudied in rare-earth ions for blue laser operation basedupon upconversion[5,6]. One approach to improving theluminescence efficiency of Tm3+ is to co-dope it withother rare-earth ions[7]. The choice of host materials is avery important factor to obtain high efficient upconver-sion emission. In this case, the main goal of the c… 相似文献
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Strong multi-order forward stimulated Brillouin scattering (SBS) has been observed in the backward pumped S-band distributed fiber Raman amplifier (FRA) with tunable narrow signal source (less than 100 MHz) when the pump power of FRA reached the SBS threshold. This does not obey the theory that only weak backward SBS lines exist according to the conservation of energy and momentum and the wave vector selected rule. This is because the sound waveguide characteristic weakens the wave vector rule, and the forward transmitted sound waveguide Brillouin scattering lines are generated and amplified in FRA.When the pump power is further increased, 11 orders of SBS lines and comb-like profile are observed. For the excited line, the frequency is 197.2296 THz and the power is 0 dBm. The even order SBS lines are stronger than odd order SBS lines, the power of the 2nd and 4th order SBS lines is 1.75 dBm, which is 16 dB higher than that of the 1st and 3rd order SBS lines. The odd order SBS lines are named BrillouinRayleigh scattering lines. 相似文献
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在1250 ̄2000V/cm的静电场变化范围内,用可调谐激发实现Na原子在n=17,m=0斯塔克族各能态布局,采用延迟脉冲场电离方法测量了各斯塔克能态在不同外电场下的寿命,讨论了外电场强度和环境黑体辐射对斯塔克态寿命的影响。 相似文献
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用可调谐激光两步激发Na原子高激发发里德堡态布居,在光激发后施加脉冲电场测量激发态的场电离阈,利用阈值电场和延迟场电离方法测定了ns(n=20~24)和nd(n=19~23)态的寿命值,并与计算值进行了比较,对影响寿命的因素作了讨论。 相似文献
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钠通道阻滞剂作用机制的闸门相关受体假说及模型 总被引:1,自引:0,他引:1
本文提出了钠通道阻滞剂作用机制的新假说——闸门相关受体假说,并建立了相应的数学模型,用此模型模拟分析了利多卡因(Lidocaine Lid)、蝙蝠葛碱(dauricine,Dau)阻滞心肌钠通道的作用。模型预测结果不仅与文献报道的实验结果一致,而且还提供了解释这些药物阻滞钠通道作用机制的新资料。研究表明,闸门相关受体假说能较好地阐明心肌钠通道阻滞剂的作用机制。 相似文献
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Study on forward stimulated Brillouin scattering in a backward pumped fiber Raman amplifier 总被引:2,自引:0,他引:2
Strong multi-order forward stimulated Brillouin scattering (SBS) has been observed in the backward pumped S-band distributed fiber Raman amplifier (PRA) with tunable narrow signal source (less than 100 MHz) when the pump power of FRA reached the SBS threshold. This does not obey the theory that only weak backward SBS lines exist according to the conservation of energy and momentum and the wave vector selected rule. This is because the sound waveguide characteristic weakens the wave vector rule, and the forward transmitted sound waveguide Brillouin scattering lines are generated and amplified in FRA. When the pump power is further increased, 11 orders of SBS lines and comb-like profile are observed. For the excited line, the frequency is 197.2296 THz and the power is 0 dBm. The even order SBS lines are stronger than odd order SBS lines, the power of the 2nd and 4th order SBS lines is 1.75 dBm, which is 16 dB higher than that of the 1st and 3rd order SBS lines. The odd order SBS lines are named Brillouin R 相似文献