共查询到20条相似文献,搜索用时 15 毫秒
1.
We theoretically studied the influence of initial parameters of laser pulses, such as polarization, pulse shape and frequency chirp, on the broadening of spectrum during pulse propagation through microstructure fibers (MSFs). We utilized two coupled-mode equations based on the nonlinear Schrödinger equation using an intermediate-broadening model for a Raman response function, and the dispersion coefficients from 2nd to 7th orders for the slow and fast axes, respectively, of highly birefringent MSFs. 相似文献
2.
Optics and Spectroscopy - Abstract—The paper presents the results of a study of the temporal and spectral characteristics of lasing at $${{B}^{2}}\Sigma _{u}^{ + }{-} {{X}^{2}}\Sigma _{g}^{ +... 相似文献
3.
Pengpeng Ding Zihan Guo Dalong Qi Jiali Yao Chengzhi Jin Ning Xu Zhiling Zhang Yunhua Yao Lianzhong Deng Zhiyong Wang Zhenrong Sun Shian Zhang 《Laser \u0026amp; Photonics Reviews》2024,18(5):2300873
Ultrafast laser pulses with complex spatiotemporal and polarization couplings have shown great application prospects in coherent control, particle acceleration, molecular dynamics excitation, and chiral or anisotropic detection. It is very important to observe the polarization-coupled ultrafast laser pulses for characterizing the performance of laser source and understanding the laser-matter interaction, but there is currently no detection technique that can completely characterize them, including the spatio-, spectral-, and polarimetric-temporal information. In this work, a polarimetric-spectral-sensitive has been compressed ultrafast photography (PS-CUP) to realize the real-time intensity visualization of time-varying polarized (TP) ultrafast laser pulses. PS-CUP can not only distinguish the polarization state of a TP pulse, but also realize the spatio-, spectral- and polarimetric-temporal measurement. To demonstrate the ability of polarization resolving detection, PS-CUP is used to successfully distinguish between the sinistral and dextral TP pulses and measure the angle and degree of linear polarization of a dextral TP pulse, respectively, and the experimental results are highly consistent with theoretical simulations. Owing to the unprecedented multidimensional detection ability, PS-CUP is prospected to provide a powerful tool for the diagnosis of various complex ultrafast laser pulses and the detection of ultrafast chiral optics. 相似文献
4.
Kiyoshi Ueda 《Synchrotron Radiation News》2016,29(5):3-7
In recent years, short wavelength free electron lasers (FELs) have opened up access to ultrafast electronic and structural dynamics in matter. Currently, four FEL facilities are in operation in the world. FLASH [1] in Germany and FERMI [2] in Italy cover the range from extreme ultraviolet (EUV) to soft X-rays, while LCLS [3] in the U.S. and SACLA [4] in Japan provide pulses in the hard X-ray regime. In addition, an upgrade version of SCSS [5], nicknamed SCSS+, has also just started user operation as a beamline of SACLA [6]. These FELs deliver coherent pulses combining unprecedented power densities up to ~1020 W/cm2 and extremely short pulse durations down to a few femtoseconds. The intense coherent FEL pulse focused down to ~1 μm2 makes single-shot diffractive imaging of nano-crystals or even non-crystallized bio-samples as well as other small objects a reality. Time-resolved spectroscopic and structural studies on the timescale of femtoseconds, having FEL pulses as a probe, allow us to probe electrons and atoms in action. Additionally, since FEL pulses are in a new regime of intensity, they are opening up new research fields that exploit the interaction between intense short wavelength pulses and matter, leading to matter at extremely high energy. Relevant theories dealing with such extreme conditions are also rapidly growing. 相似文献
5.
《中国物理快报》2017,(6)
The above-threshold detachment of F~- ions induced by a linearly polarized few-cycle laser pulse is investigated theoretically using the strong-field approximation model without considering the rescattering mechanism. We first derive an analytical form of transition amplitude for describing the strong-field photodetachment of F~- ions.The integration over time in transition amplitude can be performed using the numerical integration method or the saddle-point(SP) method of Shearer et al. [Phys. Rev. A 88(2013) 033415]. The validity of the SP method is carefully examined by comparing the energy spectra and photoelectron angular distributions(PADs) with those obtained from the numerical integration method. By considering the volume effect of a focused laser beam, both the energy spectra and the low-energy PADs calculated by the numerical integration method agree very well with the experimental results. 相似文献
6.
应用双波函数定义频率含量谐振子的量子状态,频率含时谐振子的运动得到更完整的描述,双波描述的经典极限与经典力学结果相一致。 相似文献
7.
8.
M. L. Petukh V. A. Rozantsev A. D. Shirokanov A. A. Yankovskii 《Journal of Applied Spectroscopy》2000,67(6):1097-1101
We compare radiation of plasma flares produced on exposure of metals to laser radiation in a monopulse generation mode in the case of single and double pulses with change in air pressure. For double pulses, we established an increase in the duration and intensity of the radiation of spectral lines and also an analogy between the change in their intensities and those of single pulses obtained at a reduced air pressure. 相似文献
9.
Spectrally Adjustable Picosecond Dye Laser Pulses Generated with Nanosecond Nitrogen Lasers 总被引:2,自引:0,他引:2
Nguyen Dai Hung Pham Long Dinh Van Trung Nguyen Van Tien Le Hoang Hai Nguyen Ha 《Chinese Journal of Lasers》1995,4(5):385-392
SpectrallyAdjustablePicosecondDyeLaserPulsesGeneratedwithNanosecondNitrogenLasersNguyenDaiHung;PhamLong;DinhVanTrung;NguyenVa... 相似文献
10.
Ilyin A. A. Shmirko K. A. Golik S. S. Proschenko D. Yu. 《Russian Physics Journal》2022,64(9):1629-1636
Russian Physics Journal - A numerical model describing the dynamics of plasma particle density upon filamentation of femtosecond emission in air is presented. The simulation results are in good... 相似文献
11.
Kinyaevskiy I. O. Kovalev V. I. Koribut A. V. Danilov P. A. Smirnov N. A. Kudryashov S. I. Grudtsyn Ya. V. Dunaeva E. E. Trofimov V. A. Ionin A. A. 《Journal of Russian Laser Research》2022,43(3):315-318
Journal of Russian Laser Research - Asymmetric spectral broadening combined with an efficient transient stimulated Raman scattering is experimentally demonstrated in a BaWO4 crystal pumped by 0.3... 相似文献
12.
13.
14.
Abishev N. M. Baibekov E. I. Malkin B. Z. Popova M. N. Pytalev D. S. Klimin S. A. 《Physics of the Solid State》2019,61(5):795-801
Physics of the Solid State - The procedure of calculation of the spectral line shape in optical spectra of rare-earth ions in crystals with the inclusion of random deformations of an elastically... 相似文献
15.
High-Efficiency Generation of 0.12 mJ,8.6 Fs Pulses at 400 nm Based on Spectral Broadening in Solid Thin Plates 下载免费PDF全文
《中国物理快报》2017,(7)
We demonstrate efficient generation of continuous spectrum centered at 400 nm from solid thin plates. By frequency doubling of 0.8 mJ, 30 fs Ti:sapphire laser pulses with a BBO crystal, 0.2 mJ, 33 fs laser pulses at400 nm are generated. Focusing the 400-nm pulses into 7 thin fused silica plates, we obtain 0.15 mJ continuous spectrum covering 350-450 nm. After compressing by 3 pairs of chirped mirrors, 0.12 mJ, 8.6 fs pulses are achieved.To the best of our knowledge,this is the first time that sub-10-fs pulses centered at 400 nm are generated by solid thin plates, which shows that spectral broadening in solid-state materials works not only at 800 nm but also at different wavelengths. 相似文献
16.
V. L. Kalashnikov 《Journal of Applied Spectroscopy》2000,67(6):996-1003
On the basis of numerical modeling, it is shown that the effect of the higher-order group-velocity dispersion is unable to account for the noticeable Stokes displacement of the generation spectrum in a LiSGaF laser with mode-locking due to self-focusing. The results of calculations indicate the determining influence of stimulated Raman scattering on the spectral characteristics of femtosecond pulses. 相似文献
17.
PedestalMeasurementofLaserPulsesWANGYiminZHANGZhengquanXUZhizhan(ShanghaiInstituteofOptics&FineMechanics,ChineseAcademyofScie... 相似文献
18.
Zyatikov I. A. Losev V. F. Prokopiev V. E. Lubenko D. M. Sandabkin E. A. 《Russian Physics Journal》2021,64(3):553-558
Russian Physics Journal - The results of a study of pulse duration of superradiance on molecular nitrogen ions in air under different conditions of focusing a femtosecond laser pulse with a... 相似文献
19.
B. M. Smirnov 《Journal of Experimental and Theoretical Physics》2018,127(1):48-57
An analogy is shown for broadening the spectral line of atoms in the case of competition between the short-range Doppler broadening mechanism and the long-range impact mechanism in atomic gases, as well as for the absorption band of a molecular gas in the infrared (IR) region of the spectrum, where the longrange part of the spectrum is also determined by the impact mechanism of the broadening. The long-range part in the pedestal region of the absorption band is associated with the distribution of molecules over the rotational states, and, in the range of wings of the absorption band, it is due to a finite time of collisions between emitting and perturbed molecules. The flux of resonant radiation produced by an excited atomic gas is estimated using the concepts of the spectral absorption band and a large optical thickness of the gas. These concepts are used for a molecular gas where, in the framework of the regular model (the Elsasser model), expressions are given for the absorption coefficient related to a specific spectral absorption band, separately in the pedestal region and for wings of the absorption band. As a demonstration of the possibilities of these concepts, the IR flux is calculated on the surface of Venus from its atmosphere, which includes seven vibrational transitions of the carbon dioxide molecule and amounts to 26% of the total flux of IR radiation emitted by the Venus surface. An analysis of the Venus energy balance leads to the conclusion that the main part of IR radiation of the Venus atmosphere falling on its surface is formed by a microscopic dust in the Venus atmosphere. This channel of the Venus energy balance is realized if the mass of a microscopic dust in the Venus atmosphere is seven orders of magnitude less than the mass of atmospheric carbon dioxide. 相似文献
20.