共查询到19条相似文献,搜索用时 140 毫秒
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本文研究了光学频率梳输出的整形后飞秒脉冲激光和单频激光的干涉光谱。实验中光学频率梳和单频激光干涉的信号包括直流项、光学频率梳输出的脉冲激光相邻模式之间的干涉项和光学频率梳脉冲激光与单频激光之间的干涉项。实验上研究了光学频率梳脉冲激光与单频激光干涉信号间距和单频激光频率的关系,提供了一种快速直接测量单频激光频率的有效方法。研究了光学频率梳输出的飞秒脉冲光经过铷泡后与单频激光干涉信号和单频激光频率的关系,获得铷原子吸收光谱。该研究工作对于原子分子高精密光谱测量具有一定的意义。 相似文献
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随着科技的进步以及精密测量应用技术的不断提高,超稳微波源的稳定度和噪声水平等技术要求不断提高,应用范围愈加广泛,包括高性能频标研究、网络雷达研制、深空导航系统等方面.基于超稳激光和飞秒光梳的超稳光生微波源是目前频率稳定度最高的微波频率源,相对频率稳定度可达10~(16)@1 s量级.该装置也是未来频率标准(光频标)推广应用的基础,无论是时间的产生还是绝大多数的精密测量,都需要将光频标的输出激光变换为超稳的基带频率信号后才能够实现.本文介绍了超稳光生微波源技术的发展、现状和应用需求.以国家授时中心研制的国内首套超稳微波频率源技术为主线,介绍了超稳光生微波源的原理和结构以及各组成部分的技术发展情况:超稳激光方面,着重介绍超稳光学腔研究和研制的进展以及Pound-Drever-Hall锁频技术、剩余幅度调制等噪声抑制技术;飞秒光梳方面,着重介绍目前最常用的掺铒光纤光梳系统的激光锁模、频率控制等技术发展;低噪声光电探测方面,着重介绍宽带光电探测噪声抑制技术和激光幅度噪声引起微波相位噪声的抑制技术.最后对光生超稳微波技术进行了总结和展望. 相似文献
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随着光子学技术的发展,利用玻璃和光的相互作用改变光的极化态、频率、相干性和单色性,以及产生光子和探测光子的新型光功能玻璃成为光学玻璃发展的主要方向。本文针对光学玻璃及其在光学和信息技术等相关应用领域的重要性和发展作了介绍,重点阐述了非线性光学玻璃、梯度折射率光学玻璃、激光玻璃以及其他光功能玻璃的主要特性和发展状况,并对我国的光学玻璃工业发展作了回顾。 相似文献
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用与大型激光装置输出主激光脉冲同步的梳状脉冲作为时间标尺,标定强激光与靶丸作用的过程,对强场物理实验测量及模拟实现精密化具有重要的意义.报道了一种电光调制结合光学方法产生与主激光精确同步的多频率时标激光脉冲的光纤系统.采用电光调制产生150 ps快光脉冲,通过光纤堆积产生1053 nm的基频梳状脉冲信号,经过放大和倍频输出527和351 nm的绿光及紫外倍频梳状脉冲激光. 系统可稳定地为神光Ⅲ原型装置提供精密物理实验所必需的各种频率的时标激光,并且可根据物理实验需要灵活地调整梳状脉冲间隔和幅度,具有很好的适应性.
关键词:
激光聚变驱动器
时标光
光纤激光系统 相似文献
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Femtosecond-laser-based synthesis of ultrastable microwave signals from optical frequency references
Bartels A Diddams SA Oates CW Wilpers G Bergquist JC Oskay WH Hollberg L 《Optics letters》2005,30(6):667-669
We use femtosecond laser frequency combs to convert optical frequency references to the microwave domain, where we demonstrate the synthesis of 10-GHz signals having a fractional frequency instability of < or =3.5 x 10(-15) at a 1-s averaging time, limited by the optical reference. The residual instability and phase noise of the femtosecond-laser-based frequency synthesizers are 6.5 x 10(-16) at 1 s and -98 dBc/Hz at a 1-Hz offset from the 10-GHz carrier, respectively. The timing jitter of the microwave signals is 3.3 fs. 相似文献
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We introduce a novel concept for optical frequency measurement and division which employs a Kerr-lens, mode-locked laser as
a transfer oscillator whose noise properties do not enter the measurement process. We experimentally demonstrate that this
method opens up the route to phase-link signals with arbitrary frequencies in the optical or microwave range while their frequency
stability is preserved.
Received: 23 July 2001 / Published online: 29 November 2001 相似文献
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A novel scheme which utilizes the microwave photonic filter technique for the optical generation of a microwave signal based on an active mode-locked fiber laser is proposed. A microwave signal generator using a microwave photonic filter based on a 2: 1 optical coupler with a fiber loop which can effectively suppress a low-order frequency component of the microwave signal is demonstrated and a ~10-GHz microwave signal is achieved based on an active mode-locked fiber laser with the original pulse repetition rate of ~5 GHz. 相似文献
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We describe simultaneous generation of ultralow-noise optical pulses and microwave signal with a mode-locked fiber laser in a coupled optoelectronic oscillator configuration. We demonstrate 9.2-GHz optical and microwave signals with the measured phase noise of -140 dBc/Hz at 10-kHz offset frequency. We show that the mode-locked laser in the photonic oscillator serves as a high-Q filter and is responsible for the observed low phase noise. 相似文献
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Precision phase control of an ultrawide-bandwidth femtosecond laser: a network of ultrastable frequency marks across the visible spectrum 总被引:1,自引:0,他引:1
We demonstrate that the stability of the current optical frequency comb generated by a Kerr-lens mode-locked femtosecond laser is limited by the microwave reference used for phase locking the comb spacing. Hence we implement precision frequency/phase control of the entire comb to the fundamental and second-harmonic frequencies of a stable cw laser without any external microwave reference. The stability of a cw iodine-stabilized laser is transferred to millions of comb lines (with an instability of 3 x 10(-13)) covering more than one octave of the optical frequency spectrum. In addition, the mode spacing of the comb can be used as a stable microwave frequency derived directly from a stable optical oscillator. 相似文献
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We report an experimental demonstration of a photonic microwave shifter using a highly chirped mode-locked fiber laser. The system is based on dispersive compression or expansion of highly chirped optical pulses that are amplitude modulated by the microwave signal. Using this technique, we demonstrated frequency shifting of a microwave signal from 10 GHz down to 5 GHz and up to 25 GHz. 相似文献
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Quinlan F Fortier TM Kirchner MS Taylor JA Thorpe MJ Lemke N Ludlow AD Jiang Y Diddams SA 《Optics letters》2011,36(16):3260-3262
We present an optical frequency divider based on a 200 MHz repetition rate Er:fiber mode-locked laser that, when locked to a stable optical frequency reference, generates microwave signals with absolute phase noise that is equal to or better than cryogenic microwave oscillators. At 1 Hz offset from a 10 GHz carrier, the phase noise is below -100 dBc/Hz, limited by the optical reference. For offset frequencies >10 kHz, the phase noise is shot noise limited at -145 dBc/Hz. An analysis of the contribution of the residual noise from the Er:fiber optical frequency divider is also presented. 相似文献
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We synchronize an 8.06 GHz microwave signal from a voltage-controlled oscillator with an optical pulse train from a 77.5 MHz mode-locked Er-fiber laser using a fiber-based optical-microwave phase detector. The residual phase noise between the optical pulse train and the synchronized microwave signal is -133 dBc/Hz (-154 dBc/Hz) at 1 Hz (5 kHz) offset frequency, which results in 838 as integrated rms timing jitter [1 Hz-1 MHz]. The long-term residual phase drift is 847 as (rms) measured over 2 h, which reaches 4×10(-19) fractional frequency instability at 1800 s averaging time. This method has a potential to provide both subfemtosecond-level short-term phase noise and long-term phase stability in microwave extraction from mode-locked fiber lasers. 相似文献
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Two mode-locked femtosecond fiber lasers, connected via a 7 km fiber link, are synchronized to an rms timing jitter of 19 fs, observed over the entire Nyquist bandwidth (half of the 93 MHz repetition frequency). This result is achieved in two steps. First, active cancellation of the fiber-transmission noise reduces timing jitter caused by path length fluctuations to a record level of 16 fs. Second, using a wide bandwidth interactivity actuator, the slave laser is synchronized to the incoming stable pulse train from the reference laser to within 10 fs. These results are confirmed by an optical cross-correlation measurement performed independently of the feedback loop operated in the microwave domain. 相似文献