共查询到20条相似文献,搜索用时 0 毫秒
1.
Paul Mandel 《Optics Communications》1985,54(6):374-376
We study the characteristics of a rectangular pulse used to switch an optical transistor. Three regimes appear. (i) For low intensity pulses, the pulse duration and area decrease exponentially with increasing holding intensity. (ii) For high intensity pulses, the pulse duration and area decrease linearly with increasing holding intensity. (iii) For a holding intensity near the transition region, the only constraint is on the pulse area and not on its duration or intensity separately. 相似文献
2.
V. I. Bukatyi Yu. D. Kopytin S. S. Khmelevtsov D. P. Chaporov 《Russian Physics Journal》1976,19(3):289-293
The self-broadening and intensity self-limiting of millisecond optical pulses in the nonlinear scattering of intense light in model aerosol media are investigated experimentally. The experimental results are compared with existing theoretical calculations.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 33–39, March, 1976. 相似文献
3.
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
4.
5.
6.
强场亚周期光脉冲的产生是未来激光光源发展所追求的先进内容之一,其不仅标志了超快激光技术的前进方向,并且将开启新型强场光与物质相互作用研究的大门。作为当前强场物理研究的一个重要课题——阿秒脉冲技术,强场亚周期光脉冲的出现将带给它新的发展机遇。强场亚周期光脉冲不仅可以直接产生极紫外波段孤立阿秒脉冲,而且其光电场的可裁剪性能够用来优化阿秒脉冲的产生。然而,亚周期光脉冲对应的超宽带光谱,使强场亚周期光脉冲的产生面临很大的挑战性。将多个中心波长不同的少周期超短脉冲进行合并的光场相干合成技术是实现强场亚周期光脉冲的有效技术。文章将介绍亚周期光脉冲的研究进展,着重描述基于光场相干合成技术的强场亚周期光脉冲产生方法。 相似文献
7.
We demonstrate an optical limiter for ultra-short (∼100-fs) laser pulses. The device has a dynamic range (= damage energy/onset-of-limiting
energy) of more than 10000 and an onset-of-limiting energy of only ∼10 nJ. The output-pulse energy is kept below 1.3 μJ. The
limiting mechanism is based on two-photon absorption and refractive nonlinearities in a 20-mm piece of ZnSe. We discuss the
importance of the different nonlinearities, damage issues, and guidelines for the construction of the device.
Received: 20 December 2001 / Revised version: 25 March 2002 / Published online: 8 May 2002 相似文献
8.
We analyze the response of an ensemble of 1s-excitons driven by a femtosecond optical pulse, beyond traditional “slowly varying amplitudes” approach. For optical pulses
of a given duration it is shown that the off-resonance optical field can evolve into a stable soliton with nonzero asymptotic
behavior.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 5, 380–384 (10 March 1997)
Published in English in the original Russian journal. Edited by Steve Torstveit. 相似文献
9.
In an optical storage ring, a dye laser amplifier synchronously pumped by external laser pulses has been implemented and experimentally tested. The test was done at =580 nm, but the optical system can be used without limitations in a broad band of 400–700 nm. It is shown that a selected turn of the stored laser pulse can be amplified by typically a factor of 200. Power consideration gives an increase of the efficiency of the optical storage ring with a dye amplifying cell, as compared to a single passage of the laser pulse through the experimental section, by 23 times and it is shown that it can reach a factor of more than 100. PACS 42.60.Da; 42.60.Lh 相似文献
10.
Non-linear coupling of polarized solitons with initial linear frequency chirp in a low birefringent optical fibre is analysed on the basis of a theoretical model of coupled non-linear Schrödinger equations. A threshold condition is obtained for the bound state of two polarizations corresponding to a phase mismatch in solition positions. 相似文献
11.
A new method of three-dimensional optical imaging based on range gating with subpicosecond pulses is being developed. As opposed to other techniques of medical imaging, this new method is characterized by both high contrast and resolution. Preliminary tests demonstrate a longitudinal resolution better than 10 μm. The computer algorithm needed to reconstruct the image from the attenuated backscattering and to extend to three dimensions the one-dimensional depth resolution, is discussed. 相似文献
12.
13.
R. Khare P.K. Shukla G.K. Mishra C. Mukherjee S. Talwar V.K. Dubey P. Saxena J.K. Mittal 《Optics Communications》2009,282(19):3850-3853
We present an analytical and experimental study of a novel confocal optical pulse stretcher (COPS). The simple and passive pulse stretcher consists of two concave mirrors and a scraper beam-splitter and its optical configuration ensures a perfect spatial overlapping of laser pulses at the beam-splitter. The pulse stretcher is compact and suitable for laser pulses of large divergences. The confocal optical pulse stretcher is demonstrated on a pulsed copper vapour laser to convert a 40 ns (1/e2 % points) pulse into a 55 ns with reduction of peak power by a factor of 1.375 without loss of pulse energy. 相似文献
14.
J.A. Fülöp Zs. Major B. Horváth F. Tavella A. Baltuška F. Krausz 《Applied physics. B, Lasers and optics》2007,87(1):79-84
The use of temporally shaped pump pulses for optical parametric chirped-pulse amplification can increase the efficiency and
suppress possible spectral distortions in this process. With this goal in mind a novel method for shaping narrowband picosecond
pulses has been developed. The method is based on the pulse stacking principle, where replicas of the incoming pulse are created
in a specially designed four-beam interferometer. The replicas are recombined with appropriate relative delays. The interferometer
design allows for a unique flexibility in varying the pulse shape, since all relevant degrees of freedom, such as relative
intensities and delays between the pulse replicas are independently adjustable. Here we describe the design of our device
in detail and report on the experimental demonstration of its pulse-shaping capabilities.
PACS 42.65.Yj; 42.65.Re; 42.81.Gs 相似文献
15.
We show that optical-cycle steepening in a nonlinear dielectric before focusing results in an arbitrarily large enhancement of the focused intensity and energy density. The focusing of an optical shock produces singular intensity and energy density at the focal point. 相似文献
16.
Synchronization of high-frequency chaotic optical pulses 总被引:2,自引:0,他引:2
Synchronization of high-frequency chaotic optical pulses is demonstrated in two semiconductor lasers with delayed optoelectronic feedback. The difference between synchronization and modulation is discussed. Evidence is presented to show that true synchronization, rather than modulation or amplification, is accomplished in our optoelectronic feedback system. 相似文献
17.
We have demonstrated the amplification and subsequent recompression of optical chirped pulses. A system which produces 1.06 μm laser pulses widths of 2 ps and energies at the millijoule level is presented. 相似文献
18.
19.
应用Z扫描技术在甲苯溶液中研究了三种8辛烷氧基金属酞菁[(C8H17O)8PcZn(PcZn),(C8H17O)8PcNi(PcNi)和(C8H17O)8PcPb(PcPb)]在532nm对35ps脉冲激光的三阶非线性吸收和折射特性.用多能级模型拟合实验数据,得到三种酞菁的激发单重态吸收截面积σex分别为27×10-17cm2(PcZn),8.2×10-18cm2(PcNi)和3.4×10-18cm2(PcPb),相应的非线性折射率n2=-7.9×10-13,-5.5×10-13和-1.6×10-12esu,三种酞菁都具有自散焦效应.通过入射能流与透射能流的关系,研究了该类分子在甲苯溶液中在532nm对35ps脉冲激光的限幅特性,限幅机理是基于激发单重态的反饱和吸收.在TT0=0.5时,分别测定出它们的限幅阈值为60mJcm2(PcZn),80mJcm2(PcNi)和130mJcm2(PcPb).当入射能流达到500mJcm2时,相应的最高输出能流分别为40,80和150mJcm2,其中锌和镍酞菁的输出能流远低于同样条件下C60的输出能流(140mJcm2).
关键词:
光限幅
8-辛烷氧基金属酞菁
Z-扫描
非线性吸收 相似文献
20.
We have developed a novel interferometric autocorrelator composed of only reflective elements, which functions as a beam splitter
and an optical delay line. Analytical expressions are derived to give second-order autocorrelation functions and deconvolution
factors for various conditions. The measurement of femtosecond laser pulses by interferometric autocorrelation is demonstrated
in the visible region. The results are compared with those by calculation.
Received: 9 December 2002
Revised version: 18 February 2003 / Published online: 5 May 2003
RID="*"
ID="*"Present address: Department of Physics, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1207, Japan
RID="**"
ID="**"Corresponding author. Fax: +81-48/462-4682, E-mail: asuda@postman.riken.go.jp 相似文献