共查询到18条相似文献,搜索用时 171 毫秒
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利用偏振光谱对外腔式半导体激光器实现无调制锁频 总被引:2,自引:2,他引:0
将激光器输出频率相对于合适的参考频率标准进行锁定,可以有效地抑制激光器的频率起伏,提高激光器的频率稳定度。对铯原子偏振光谱进行平衡探测,当偏振光谱透射方向与偏振分束棱镜(PBS)偏振面之间的夹角选择合适时,平衡探测后的输出信号即为铯原子D2跃迁线的色散形鉴频信号。实验上实现了波长为852 nm的外腔式半导体激光器对应于铯原子6S1/2(F=4)→6P3/2(F′=5)超精细跃迁线的频率锁定。研究获得在50 s内激光器频率起伏小于±250 kHz,较相同时间内激光器自由运转时的频率起伏3 MHz有显著改善。这种频率锁定的方法不需要对激光器进行调制。 相似文献
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通过入射的半导体激光束与在铷汽泡中产生的受激Raman散射光束之间的拍频,从高速光检测器中将输出一频率为铷原子基态超精细跃迁频率的信号.由于上述过程与暗线共振、电磁诱导透明及原子体系中的相千诱导Raman增益等密切相关,故此拍频信号具有相当窄的线宽和高的频率稳定度,以此为参考频率,可望作成迄今最小的微型原子频标.此外,这种频标对加速度很不敏感,功耗极低,频率稳定度性能适中,因而特别适于恶劣环境下使用(如通讯网中的时间同步、GPS接收机以及许多军事装备等).到目前为止已经提出和试验过若干方案,包括… 相似文献
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在铷原子蒸汽中,同时引入一束强相干光和两束耦合光共同作用在一个多普勒加宽的四能级N模型原子系统中。在原子系统中通过耦合场的引入以及耦合场强度的调节,观察量子光学现象。首先,由原子模型出发,由哈密顿量方程求得密度矩阵,再经由拉氏变换法求解,得出弱探测光的吸收光谱表达式。在光路设计中,采用耦合光与探测光同向,与饱和光反向传播,通过光场参数的调节,可以观察到六个相干光学烧孔和一个电磁感应光透明窗口。同时,采用了两束耦合光分别和探测光反向、同向传播,饱和光与探测光反向传播。此时在吸收光谱中,将同时出现电磁感应光透明和电磁诱导吸收两种现象。进而,在原子系统中,采用光路的不同搭配,在吸收光谱中可以观测到吸收增强或减弱情况的出现,包括形成烧孔的位置和个数的变化;通过驱动场激发原子的相干跃迁,使得在吸收谱线中同时出现电磁诱导透明和电磁诱导吸收两种吸收特性,并通过光场的调节,数据模拟的比较,分析两种量子相干效应的产生和转换,进行深入研究,并得出结论,这些结果对于现在热门的光学量子存储将有较好的理论指导。 相似文献
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实现了利用铯原子圆二向色性激光稳频(DAVLL)技术保证频率的非共振锁定并连续可调。介绍了DAVLL技术用于稳定激光频率的基本原理,指出由于Cs原子复杂的能级结构,导致简单的DAVLL技术此处不再适用,并且发现稳频曲线的零点与磁场强度的大小有关;利用饱和吸收光谱测量磁场对DAVLL谱线鉴频零点的影响,发现激光频率在以Fg=4→Fe=5跃迁红失谐105MHz为中心50MHz范围内线性可调,频率稳定度可达3MHz。 相似文献
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面向芯片化空间激光通信、激光雷达等应用对高功率激光光源的需求,笔者将注入锁定到同一种子光的分布式反馈激光器(DFB激光器)阵列通过平面波导耦合器进行相干合束,解决了单个DFB激光器功率受限的问题。为了研究基于注入锁定技术的DFB激光器阵列的相干合束效果,测量了不同数目的注入锁定激光器在相干合束前后的光功率、相位噪声、相对强度噪声,通过计算得到2、3、4个DFB激光器的合束效率分别为91.6%、87.8%、78.3%,实现了相对于单个激光器的光功率放大,同时通过理论分析和实验研究了相干合束对相位噪声及相对强度噪声的影响。 相似文献
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1560 nm窄线宽激光器作为光学C波段的重要波长成分,在光纤传感和激光雷达等领域有着广泛的应用,实现该波段的激光稳频对光谱学和精密测量具有重要意义。本文采用1560 nm窄线宽光纤激光器作为种子光源,倍频至780 nm波段后,利用调制转移光谱(MTS)将倍频光锁定在铷原子(85Rb)D2线的3-4交叉峰上;并研究探测光和泵浦光功率比、调制解调信号的频率和幅值来优化MTS信号,最终同时实现1560 nm光纤激光器的频率锁定及780 nm的稳频输出。激光器稳频后与低噪声精密锁定的光学频率梳进行拍频,通过频率计测量拍频信号并进行Allan方差分析,积分时间为10 s时,相对频率稳定度为1.4×10-11。 相似文献
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Amplitude-modulation (AM) sideband injection-locking characteristics of 1.3-μm distributed-feedback lasers are studied experimentally. When the master laser light, which is amplitude-modulated, is injected into slave lasers, the slave lasers can be phase-locked to each sideband of the master laser. This means that the frequency separation between slave lasers can be controlled by the modulation frequency of the master laser. By controlling the injection power, it is possible to achieve a very stable AM sideband injection-locked state of slave lasers. Results on phase-noise and phase-modulation measurements, the frequency stabilization between two channels, and the injection locking to a short pulse are presented. On the basis of the experimental results, an example for designing the multifrequency laser transmitter by means of the AM sideband injection-locking and the mode-locking techniques is described 相似文献
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A master optical clock from a mode locked laser is distributed to two slave twin section lasers. One slave laser divides the optical modulation frequency by 2, the other slave laser multiples the frequency by 2. It is also possible to vary the multiplication-division ratio in a slave laser using only DC control of the absorber of the twin section laser.<> 相似文献
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A method for improving coherence in semiconductor lasers by negative electrical feedback is proposed for stabilization of the center frequency of the field spectrum, linewidth reduction of the field spectrum, frequency tracking to another highly coherent laser, and stable and wideband frequency sweep. Experimental center frequency stabilization of the master laser showed that the magnitude of frequency fluctuations was reduced to 50 kHz at the integration time τ=3 s. The linewidth of the master laser was reduced to 100 kHz, which was 1/50 that of the free running laser. Under these frequency control conditions, the frequency of the slave laser was controlled so that the phase of the heterodyne signal between the master and the slave lasers could be locked to that of a stable microwave synthesizer. The slave laser frequency tracked accurately to the master laser frequency 相似文献
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A relative frequency stabilization technique using optical phase locking of miniature diode pumped Nd:YAG ring lasers is described. The master laser is RF phase modulated with a modulation index up to 7.4, and slave lasers are locked up to 21 master laser sidebands with a frequency stability better than 3 kHz 相似文献
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AM sideband injection locking is demonstrated experimentally using 1.3?m DFB lasers. The slave laser is injection-locked to a 3 GHz AM sideband of the master laser. By controlling the injection power, a very stable injection-locked state of the slave laser can be achieved. The phase noise and phase modulation characteristics are also discussed. 相似文献
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Microwave signal generation with injection-locked laser diodes 总被引:4,自引:0,他引:4
Heterodyne detection of the light from two slave lasers injection locked to FM sidebands of a modulated master laser is used to generate a narrowband microwave signal at 10.5 GHz. 相似文献
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用于布里渊分布式光纤传感的光学锁频系统 总被引:1,自引:0,他引:1
报道了一种用于布里渊分布式光纤传感器(DOFS)的高稳定光学锁频系统。一台波长为1550nm的半导体分布反馈(DFB)激光器作为主激光器用于光纤传感探测,另一台同样的激光器作为从激光器,采用光学锁相的方法将其与主激光器进行频率跟踪,使主激光器与从激光器频率差恒定为11GHz。利用该光源搭建基于自发布里渊的分布式光纤传感系统(BOTDR),可以有效地实现宽带移频,使得探测解调频率降低到百兆赫兹量级,大大降低了探测的噪声,并且降低了BOTDR系统成本。结果表明,采用此光源方案的频率波动范围为±1MHz。 相似文献
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Cotteverte J.-C. Ropars G. Le Floch A. Bretenaker F. 《Quantum Electronics, IEEE Journal of》1994,30(11):2516-2525
The vectorial injection locking of a slave laser by a linearly polarized master laser is theoretically and experimentally investigated, taking the nature and the stability of the eigenstates of the slave laser into account. It is proved that the behavior of the polarization, intensity, and frequency of the slave laser can be described by four nonlinear coupled differential equations, for lasers in which population inversion remains quite constant. In particular, it is shown that the stability of the eigenstates of the slave laser plays a dramatic role in the response of this laser to injection. Isotropic slave lasers are shown to follow adiabatically the polarization of the master laser in the frequency locking range. Loss anisotropic slave lasers exhibit a specific Adler tongue behavior and can support the transfer of the polarization of the master laser only along their eigenstates. Phase anisotropic slave lasers are shown to exhibit two bistable or simultaneous Adler curves and to offer new possibilities of all-optical command. In all of these cases, a good agreement is obtained between theory and experiment and the study of polarization throws light on the physics of injection locking 相似文献