共查询到20条相似文献,搜索用时 93 毫秒
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共孔径元件是强激光发射光学系统极为重要的光学部件。本文研究了隐埋光栅型共孔径分光元件产生色散的机理,提出补偿色散的方法,并给出色散补偿设计实例。 相似文献
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软X射线多层膜色散元件 总被引:1,自引:0,他引:1
介绍研制软X射线多层膜色散元件的初步结果,结合M0/S1、S/S1色散元件的研制实例,讨论了包括设计、性能模拟计算、镀膜工艺、检测等在内的制备过程,这些元件将在X射线光学和X射线光谱学的有关研究工作中得到应用。 相似文献
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We demonstrate that it is possible to perform a fractional Fourier transform of an incident pulse with a continuously variable degree of fractionality, using a dispersive and nonlinear Kerr medium. This medium acts as a linear waveguide for the optical pulse if its intensity is small and if the refractive index is nonlinearly time-dependently modified by a simultaneously launched bright soliton. For optical pulses the dispersive and nonlinear medium is perfectly equivalent to a graded-index refractive medium for optical beams. 相似文献
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Experimental study on the chirped structure of the white-light continuum generation by femtosecond laser spectroscopy 下载免费PDF全文
The chirped structure of the white-light continuum generation (WLCG) pulse produced by focusing 800nm laser pulse with a pulse duration of 150fs (FWHM: full-width-at-half-maximum) onto a 2.4 mm thick sapphire plate was investigated by the optical Kerr gate technique with normal hexane as the optical Kerr gate medium. The observed WLCG was positively chirped, the measured anti-Stokes spectrum of WLCG ranges from 449 to 580nm with a temporal span of 2.56ps. When using metal reflecting mirrors to eliminate the group velocity dispersion (GVD) effect, we found that a span of 1.3ps still remained, indicating that the chirped pulse cannot be accounted for simply by GVD of the pulse propagation in the dispersive media. Our results suggest that the light-induced refractive index change due to the third-order nonlinear optical effect leads to an additional positive group velocity dispersion, which contributes to an important portion of the observed temporal broadening of the chirped WLCG. In addition to using reflective optical elements instead of dispersive optical elements, an effective way of reducing the chirp is to minimize the optical path length of the WLCG medium. 相似文献
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By introducing an intracavity Doppler shift in a resonator with a highly dispersive nonlinear medium, a train of optical pulses is generated whose features are related to the slow/fast-light response of the medium. The cavity transmission is asymmetric and the pulse shape is modified differently depending on the direction of the Doppler shift, hence, on the sign of the group delay provided by the dispersive process. 相似文献
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The transformation of the envelope of a Gaussian pulse incident on and reflecting from a nonlinear dispersive medium is studied.
It is shown that the pulse envelope transforms considerably upon reflection near the optical resonance frequency and the nonlinearity
of the medium may appreciably distort the reflected pulse. Away from the resonance frequency, conditions may arise when the
shift of the reflected pulse does not lead to the loss of the Gaussian form. In this case, the influence of nonlinearity is
insignificant. 相似文献
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Spatiotemporal evolution of continuous-wave field and dark soliton formation in a microcavity with normal dispersion 下载免费PDF全文
Stable dark soliton and dark pulse formation in normally dispersive and red-detuned microcavities are investigated by numerically solving the normalized Lugiato-Lefever equation. The soliton essence is proved by fitting the calculated field intensity profile with the analytical formula of a dark soliton. Meanwhile, we find that a dark soliton can be generated either from the nonlinear evolution of an optical shock wave or narrowing of a locally broad dark pulse with smoother fronts. Explicit analytical expression is obtained to describe the oscillatory fronts of the optical shock wave. Furthermore,from the calculation results, we show that for smaller frequency detunings, e.g., α 3, in addition to the dark soliton formation, a single dark pulse with an oscillatory dip can also arise and propagate stably in the microcavity under proper pump detuning and pump strength combination. The existence region together with various field intensity profiles and the corresponding spectra of single dark pulse are demonstrated. 相似文献
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Optics and Spectroscopy - A theory of optical two-component pulse of self-induced transparency in a dispersive medium has been developed. Using the generalized version of the perturbative expansion... 相似文献
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Frequency-resolved optical gating is used to characterize the propagation of intense femtosecond pulses in a nonlinear, dispersive medium. The combined effects of diffraction, normal dispersion, and cubic nonlinearity lead to pulse splitting. The role of the phase of the input pulse is studied. The results are compared with the predictions of a three-dimensional nonlinear Schr?dinger equation. 相似文献
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O. I. Paseka V. E. Lobanov A. P. Sukhorukov 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(12):1628-1631
A theory of compression of short optical pulses with quadratic phase modulation in a dispersive medium has been developed. The results of numerical simulation of the equation for the light wave field are reported. The conditions are found at which a pulse is compressed to one oscillation period. The optimal phase modulation index providing the maximum pulse compression is estimated. 相似文献
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《Comptes Rendus Physique》2009,10(10):1008-1013
A novel technique to produce large all-optically controlled tunable delays of 100 ps pulse train in optical fibers is demonstrated. The configuration of the delay line basically consists of two main stages: the wavelength conversion via semiconductor optical amplifiers and the group velocity delaying via a dispersive optical medium. The wavelength-converted signal was precisely delayed over a wide temporal range from picoseconds to nanoseconds using a dispersive fiber, preserving the wavelength and the bandwidth of the signal. 100 ps FWHM signal pulses were delayed continuously up to 14 ns with moderate pulse distortion, corresponding to a 140-bit delay. To cite this article: L. Thévenaz, S. Chin, C. R. Physique 10 (2009). 相似文献