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飞秒激光脉冲的载波包络相移测量与控制是实现阿秒脉冲与光学原子钟的重要内容,在利用光子晶体光纤扩展飞秒钛宝石激光振荡器光谱的研究基础上,通过自参考技术测量并优化了该激光输出脉冲的载波包络相移所引起的拍频信号.实验上采用半导体抽运的倍频Nd:YVO4532nm激光器作为抽运源,对钛宝石激光器所产生的平均功率500mW、脉宽18fs的光脉冲进行拍频测量后观察到约23MHz的频移,对应于每周期053π的载波包络相移.飞秒激光脉冲载波包络相移测量的实现对于进一步利用电子反馈系统精确控制载波包络相移,从而得到高稳定的飞秒激光频率梳具有重要意义.
关键词:
载波包络相移
光子晶体光纤
飞秒
超连续 相似文献
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飞秒激光双脉冲在研究光泵浦的超快瞬态过程领域具有重要的应用价值,如何实现高准确度的飞秒激光双脉冲的实时测量显得尤为重要.本文提出了一种基于自相关法的飞秒激光双脉冲参量的测量方法,可实现对共光路传输、具有飞秒至皮秒级时间间隔的飞秒激光双脉冲的脉冲间隔、脉冲宽度和强度比的实时测量.实验中采用自相关仪测得了双折射晶体(钒酸钇)分束出的飞秒激光双脉冲的自相关曲线,并用非线性拟合算法求得了飞秒激光双脉冲的脉冲间隔、脉冲宽度和强度比参量.实验结果表明,本文方法与互相关测量方法相比,克服了参考脉冲参量的不确定性对检测准确度的影响,使测量平均准确度提高了48%以上. 相似文献
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飞秒激光双脉冲在研究光泵浦的超快瞬态过程领域具有重要的应用价值,如何实现高准确度的飞秒激光双脉冲的实时测量显得尤为重要.本文提出了一种基于自相关法的飞秒激光双脉冲参量的测量方法,可实现对共光路传输、具有飞秒至皮秒级时间间隔的飞秒激光双脉冲的脉冲间隔、脉冲宽度和强度比的实时测量.实验中采用自相关仪测得了双折射晶体(钒酸钇)分束出的飞秒激光双脉冲的自相关曲线,并用非线性拟合算法求得了飞秒激光双脉冲的脉冲间隔、脉冲宽度和强度比参量.实验结果表明,本文方法与互相关测量方法相比,克服了参考脉冲参量的不确定性对检测准确度的影响,使测量平均准确度提高了48%以上. 相似文献
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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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基于单个BBO非线性晶体,利用非共线光参量放大技术,研究了载波包络相位稳定的高效率可调谐近红外脉冲产生.以载波包络相位稳定的飞秒激光放大系统产生的白光作为种子光,注入一个二类匹配的二级光参量放大器,在1350 nm波段获得抽运-信号光34%的转换效率.利用f—2f光谱相干测量技术,放大脉冲载波包络相位的抖动30 min内小于137 mrad.该方法提供了一种简单高效的载波包络相位稳定的红外脉冲产生技术. 相似文献
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报道了自主研制的面向Li原子D1线频率测量应用的掺铒飞秒光纤光学频率梳,包括飞秒激光源,频率探测及控制单元,光谱展宽及拍频单元.光纤光梳系统中飞秒激光光源是一套基于非线性偏振旋转锁模机制的掺铒飞秒光纤激光器,重复频率为196.5MHz,中心波长为1 572nm.利用f-2f法探测载波包络相移频率,获得信噪比约为40dB的信号(分辨率带宽300kHz).改变飞秒激光光源泵浦控制载波包络相移频率、频率稳定度是3.74×10-18/τ1/2;通过电光晶体和压电陶瓷改变飞秒激光光源腔长来控制重复频率frep、频率稳定度是1.75×10-13/τ1/2.利用高非线性光纤和倍频晶体将光纤光梳直接输出光谱由1 520~1 607nm扩展到671nm,获得了单模功率为208nW的光信号.与671nm单频激光拍频产生约为60dB(分辨率带宽1Hz)信号,满足Li原子D1线频率测量实验的需求. 相似文献
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自衍射效应在飞秒激光领域有非常重要的应用,如提高飞秒脉冲的时域对比度、作为自参考光谱干涉脉冲测量法的参考光、作为频率分辨光学开关法的信号光等.然而,具有较宽光谱带宽的飞秒激光在自衍射效应过程中产生的信号光存在明显的角色散,这给自衍射效应的应用带来不利影响.本文研究发现通过在自衍射效应的一个光路中加入等腰直角棱镜,当到棱镜的入射角为23fi时可以明显地减小飞秒激光脉冲自衍射信号的角色散.这就为以后将自衍射效应更好的应用到飞秒激光脉冲的研究提供了有用的参考. 相似文献
11.
M. G?rbe C. Grebing G. Steinmeyer K. Osvay 《Applied physics. B, Lasers and optics》2009,95(2):273-280
The carrier-envelope offset frequency of a laser oscillator is determined from the visibility of spectrally resolved fringes
in a combined two-path multiple-path interferometer. At maximum visibility the pulses have zero carrier-envelope phase drift,
while the visibility becomes zero for uncorrelated pulses. The method is widely independent of bandwidth and pulse energy.
The effects of carrier-envelope offset phase noise, finite detection time, and dispersion are also discussed.
M. G?rbe and C. Grebing have equally contributed to this paper. 相似文献
12.
Sansone G Benedetti E Caumes JP Stagira S Vozzi C Pascolini M Poletto L Villoresi P De Silvestri S Nisoli M 《Physical review letters》2005,94(19):193903
By using a self-referencing technique, we have experimentally measured the influence of the carrier-envelope phase of femtosecond light pulses on the phase of the electric field of the radiation produced by high-order harmonic generation. We show that, in particular experimental conditions, the temporal evolution of the electric field of the attosecond pulses, is directly controlled by the carrier-envelope phase of the driving pulses. 相似文献
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J.-h. Lee E. B. Kim T. T. Luu W.-K. Lee D.-H. Yu J. Park C. Y. Park T. J. Yu C. H. Nam 《Applied physics. B, Lasers and optics》2011,104(4):793-797
We analyzed frequency-domain characteristics of a femtosecond laser whose carrier-envelope phase (CEP) was stabilized by the
direct locking method (DLM). To evaluate the CEP-stabilized laser with zero carrier-envelope-offset frequency (f
ceo), as imposed by DLM, a self-referencing f-to-2f interferometer with a shifted frequency comb by an acousto-optic modulator was employed in an out-of-loop. The measurement
of the square root of triangle variance confirmed that DLM is a phase-locking method. The tight locking was verified from
a narrow bandwidth of f
ceo, measured using the out-of-loop interferometer, and from a small frequency jitter measured with a frequency counter referenced
to a Rb-clock. The femtosecond laser with CEP stabilized by DLM is, thus, well suited for applications in the frequency domain
as well as in the time domain. 相似文献
14.
L. Bergé C.-L. Soulez C. Köhler S. Skupin 《Applied physics. B, Lasers and optics》2011,103(3):563-570
We numerically study the influence of the initial carrier-envelope phase (CEP) on the filamentation of ultrashort laser pulses
in noble gas. Emphasis is put on the CEP-induced changes of pulses that reach their clamping intensity during near-cycle self-compression.
In other propagation regimes, the CEP does not significantly alter the pulse evolution. Our results indicate that third-harmonic
generation, compared to plasma generation, is dominant in driving these changes. Finally, the stability of the filament CEP
against shot-to-shot fluctuations is examined. 相似文献
15.
Isolated attosecond pulse generation with few-cycle two-color counter-rotating circularly polarized laser pulses 下载免费PDF全文
Most of the schemes for generating isolated attosecond pulses(IAP) are sensitive to the carrier-envelope phase(CEP)of the driving lasers. We propose a scheme for generating IAP using two-color counter-rotating circularly polarized(TCCRCP) laser pulses. The results demonstrate that the dependence of the IAP generation on CEP stability is largely reduced in this scheme. IAP can be generated at most of CEPs. Therefore, the experiment requirements become lower. 相似文献
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The carrier-envelope phase (CEP) characteristics of the tunable infrared laser pulses from a noncollinear optical parametric amplifier (OPA) with passively stabilized CEP are investigated experimentally. We compare the CEP fluctuation of different wavelength outputs from the OPA which is seeded by the idler pulse of a difference frequency generation (DFG) process. It is found that when the OPA output is tuned to a longer wavelength, the CEP fluctuation becomes less sensitive to the jitter of laser intensity and the phase mismatch, and therefore more stable CEP for the longer wavelength output pulses is realized. 相似文献
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J.-H. Lee Y. S. Lee J. Park J. J. Park D. S. Kim T. J. Yu C. H. Nam 《Applied physics. B, Lasers and optics》2009,96(2-3):287-291
We have stabilized the carrier-envelope phase (CEP) of amplified femtosecond laser pulses from a grating-based chirped-pulse amplification femtosecond laser by the direct locking method. Long-term CEP stabilization in the oscillator was achieved by employing a double-feedback loop to control both the pumping power and the cavity dispersion. Large CEP drift, induced during amplification, was compensated by adjusting the grating separation in the pulse compressor, and the CEP stabilization was maintained for four hours with a phase jitter of about 180 mrad. After pulse compression to 5.5-fs pulses in a filamentation pulse compressor, CEP-stabilized laser pulses were applied for high-harmonic generation to confirm the CEP stabilization. 相似文献
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A bandwidth-independent and linear interferometric method for the measurement of the carrier-envelope phase drift of ultrashort pulse trains is demonstrated. The pulses are temporally overlapped in a resonant multiple-beam interferometer. From the position of the spectral interference pattern, the relative carrier-envelope phase between two subsequent oscillator pulses is obtained at data acquisition rates up to 200 Hz. Cross calibration has been performed by f-to-2f interferometry in two independent experiments. The optical length of the interferometer has been actively stabilized, leading to a phase jitter of 117 mrad (rms). These results indicate a reduced noise and quicker data acquisition in comparison with previous linear methods for measuring the carrier-envelope phase drift. 相似文献
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A robust nonoptical carrier-envelope phase (CEP) locking feedback loop, which utilizes a measurement of the left-right asymmetry in the above-threshold ionization (ATI) of Xe, is implemented, resulting in a significant improvement over the standard slow-loop f-to-2f technique. This technique utilizes the floating average of a real-time, every-single-shot CEP measurement to stabilize the CEP of few-cycle laser pulses generated by a standard Ti:sapphire chirped-pulse amplified laser system using a hollow-core fiber and chirped mirror compression scheme. With this typical commercially available laser system and the stereographic ATI method, we are able to improve short-term (minutes) CEP stability after a hollow-core fiber from 450 to 290 mrad rms and long-term (hours) stability from 480 to 370 mrad rms. 相似文献
20.
Ricci A Jullien A Forget N Crozatier V Tournois P Lopez-Martens R 《Optics letters》2012,37(7):1196-1198
We demonstrate compression of amplified carrier-envelope phase (CEP)-stable laser pulses using paired transmission gratings and high-index prisms, or grisms, with chromatic dispersion matching that of a bulk material pulse stretcher. Grisms enable the use of larger bulk stretching factors and thereby higher energy pulses with lower B-integral in a compact amplifier design suitable for long-term CEP control. 相似文献