共查询到20条相似文献,搜索用时 156 毫秒
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为了实现对锁模飞秒钛宝石激光器的相位控制,采用改进的相移测量装置,使载波包络频移信号的信噪比提高到了40 dB以上.在此优化测量结果的基础上,利用电子锁相环技术,通过PZT改变激光器腔内端镜的倾斜将飞秒激光脉冲的载波包络相位锁定到了微波参考源TV-Rb钟10 MHz标准信号上,同时激光脉冲重复频率也采用另一个PZT控制激光腔长锁定到了同一个TV-Rb钟10 MHz信号上.锁定后的结果显示重复频率的锁定达到了TV-Rb钟本身的稳定度,而载波包络相位锁定后比锁定前稳定度提高了三个数量级. 相似文献
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基于KTP键合晶体采用Hansch-Couillaud频率锁定技术实现了双波长外腔同时共振,理论和实验上分别研究了基于键合KTP晶体的HC频率锁定方案. 研究表明,与采用单KTP晶体的结果相比,采用键合KTP晶体进行HC锁频时,能将激光频率分别锁定到e1光或e2光的共振峰值. 实验中将环形腔腔模频率锁定到938nm激光器的输出频率上,1583nm激光器的输出频率锁定到环形腔腔模频率上,从而实现了三者之间的相位关联锁定.
关键词:
键合KTP晶体
Hansch-Couillaud锁频
双波长外腔共振 相似文献
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基于超导器的连续波运行的高流强质子/氘束被越来越多的大科学装置所采用。在流强低于10 mA情况下,用于加速低段粒子的超导腔的高阶模影响基本可以忽略,但是对于加速百mA强流的低超导腔,其高阶模损耗情况有待研究。近期北京大学设计并加工了一支=0.09、运行频率162.5 MHz的超导半波长谐振腔,用于研究非相对论低超导半波长谐振腔加速100 mA强流质子束时可能涉及到的关键物理问题。重点研究了这支半波长谐振腔内部高阶模损耗的问题,用时域和频域两种方法分别计算了腔的高阶模损失因子,同时计算了考虑加工误差下腔内发生高阶模共振激发的概率。 相似文献
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研究了含Kerr介质高Q腔中单个二能级原子与双模量子化光场发生Raman耦合过程的腔场谱,给出原子初态处于基态而初始光场为数态时的数值结果.发现在一般情况下,两模腔场谱均为双峰结构,Kerr效应对真空场谱结构无影响.在弱场条件下,Kerr效应的增强会导致备模高频峰明显增高,而低频峰明显降低;在强场条件下,各峰峰位都随着Kerr效应增强明显右移,谱结构整体偏离原共振频率. 相似文献
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与双模腔场具有不同耦合常数的两原子辐射谱 总被引:6,自引:4,他引:2
研究了两原子与双模腔场具有不同耦合常数(g2≠g1)时的辐射谱,分析了辐射谱在一般情况下呈现出对称十六峰结构的原因。发现模1、模2腔场在与两原子非简并双光子相互作用过程中的地位相同。讨论了双模腔场分别处于不同数态时,辐射谱的新特点。双模腔场中单原子的辐射谱可作为特例得出 相似文献
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研究了Kerr效应对单个二能级原子与二项式光场相互作用系统腔场谱的影响.研究发现,腔场谱结构对Kerr效应非常敏感,Kerr效应的轻微改变可使腔场谱结构明显变化,谱线劈裂、右移、间距增大、失去原有的对称性.在Kerr效应一定的情况下,一模腔场谱对另一模腔场的强弱也很敏感,一模腔场谱的增强可使另一模腔场谱线劈裂、右移、间距渐大,形成中心峰强,边峰弱,不对称的梳状结构. 相似文献
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Pengcheng Shi Jianguo Chen Lingxuan Qian Diyong Yan Jun Lei 《Optics & Laser Technology》2007,39(5):953-956
For a laser diode array (LDA) positioned in an external cavity of a certain length, a very strong inter-emitter coupling can be established between the off-axis lateral modes of the broad-stripe emitters. Under these circumstances, the phase-locked operation of the LDA due to couplings between off-axis modes of emitters has been observed, for the first time to our knowledge. The observations suggest that phase locking of a broad-stripe LDA can be achieved among different emitter lateral modes by selecting different cavity lengths. 相似文献
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采用反应离子刻蚀技术,设计、制备了一种角反射器耦合的10单元InGaAs应变层单量子阱镇相列阵激光器。在高达4×Ith的工作电流范围内,获得了主单瓣远场输出,单瓣束宽最低达0.64°,接近衍射极限。考虑了角反射器引入的纵模与侧模之间的耦合,及载流子注入引起的反折射率导引,用微扰理论作了模拟计算,表明角反射器耦合是锁相列阵的一种新的耦合机制;主瓣对应于同相锁定,支瓣是由周期性微扰引入的高阶本征模。 相似文献
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Zhiguo Wang Zhiyu Hu Yuan Zhang Rui Zheng Tiancong Liu Yanpeng Zhang 《Annalen der Physik》2023,535(5):2200652
Introducing vortices into an Airy beam by the interference between the lobes of the Airy beam for the first time, the modulation of Airy vortices is experimentally and theoretically investigated by electromagnetically induced transparency (EIT) effect and changing the number of side lobes of the Airy beam. The formation and disappearance of vortices in Airy beams can be caused by changing the number of side lobes. The EIT effect can induce the movement of vortex phase singularity by regulating the intensities of lobes in Airy beams. However, changing the number of side lobes can change the energy distribution of the lobes through the energy flow due to the self-healing of Airy beams, thus causing the displacement of vortex phase singularity. In addition, the simulation of the Poynting vector shows that the less the side lobes are blocked, the more energy can be retained in the main lobe and the unblocked side lobes, so that the overall shape of the Airy beam can be better maintained. Such studies provide a new method to acquire and adjust Airy vortex beams and can be applied in the realm of optical micromanipulation. 相似文献
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We present a systematic study of external optical feedback effects on the output characteristics of the two orthogonally polarized modes in a frequency locking dual frequency laser. Accompanied by the change of the external cavity length, the length of the resonance cavity is changed very slowly to set the oscillating modes sweeping across the laser gain curve. Comprehensive results are obtained and a strong mode competition is observed. Particularly, when the laser runs in the middle region of the gain curve, which mode can oscillate is determined by the movement direction of the external feedback mirror. Based on the phenomenon, a displacement sensor with directional discrimination is proposed and its capability is also discussed. 相似文献
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L. Dong P. Yang B. Xu X. Lei Y. Ning W. Liu H. Yan 《Applied physics. B, Lasers and optics》2011,104(3):725-733
Transforming high-order mode Laguerre–Gaussian beams in the far-field using a 127-actuator deformable mirror controlled by
a stochastic parallel gradient descent algorithm is presented. As a phase shift of half wave exists between every neighboring
lobes of high-order mode Laguerre–Gaussian beams, there are multiple lobes in the far-field. The suitable beam radius related
to the aperture size of the deformable mirror is discussed. Three system performance metrics are evaluated, and encircled
energy is preferred. Simulation results show that it is possible to compensate for the phase shifts and other phase aberrations
of a high-order mode Laguerre–Gaussian beam and achieve a single bright lobe with this approach. Transforming the far-field
intensity distribution of high-order mode Laguerre–Gaussian beams into Gaussian and super Gaussian distributions are also
investigated. 相似文献
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A modified spectral beam combining(SBC) approach based on double asymmetrical filters was proposed. By using this scheme, the high-order lateral modes at the edge of the far-field pattern can be suppressed in the external cavity, and the beam quality in the slow-axis direction was improved from 16.1 to 13.4 compared to the conventional SBC. In the meanwhile, the electrical-to-optical efficiency from the modified SBC was more than 40% with an output power of 34.1 W, which is similar to that of the conventional SBC. 相似文献