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排序方式: 共有131条查询结果,搜索用时 46 毫秒
51.
《Physics letters. A》2020,384(7):126153
The optomechanically induced transparency (OMIT), an optomechanical analogue of electromagnetically induced transparency, is a very interesting interference phenomenon. Recently, the studies on the OMIT have been extended to double-OMIT by integrating more optical or mechanical subsystems such as mechanical oscillators, coupled cavities, and atoms in vibrational cavity. In this paper, we demonstrate the double-OMIT can be observed in Laguerre-Gaussian (L-G) rovibrational cavity which was proposed by Bhattacharya et al. (2008) [40], an analog of the double-OMIT in vibrational cavity. The double-OMIT in this research is naturally resulted from a single rovibrational mirror which vibrates and rotates simultaneously, rather than by integrating several subsystems as previously. We numerically examine the influence of the various factors on the double-OMIT and discuss its features and physics behind them in detail. In addition, we discuss the Stokes field generated via the four-wave mixing process in the L-G rovibrational cavity. 相似文献
52.
《Current Applied Physics》2014,14(7):946-953
A theory, combining the relations of pulse traveling into quantum dot (QD) semiconductor optical amplifier (SOA) with the four-wave mixing (FWM) theory in these SOAs, is developed. Carrier density pulsation (CDP), carrier heating (CH), and spectral hole burning (SHB) contributions on FWM efficiency are discussed. Effect of QD ground state and wetting layer are included. An additional parameter appears in the gain integral relation of QD SOAs. An equation formulating pulses in the QD SOAs is introduced. We have found that FWM in QD SOAs is detuning and is pulse width dependent. For short pulses, CH is dominant at high detunings (10–100 GHz) while at higher detunings (>100 GHz) the SHB is the dominant one. Undesired paunch behavior is shown in QD SOAs then, CDP must be reduced. 相似文献
53.
Yun-Fei FanHai-Hua Wang Xiao-Gang Wei Ai-Jun LiZhi-Hui Kang Jin-Hui WuHan-Zhuang Zhang Huai-Liang XuJin-Yue Gao 《Physics letters. A》2012,376(5):785-787
We experimentally demonstrate a light storage via slow-light four-wave mixing in a solid-state medium with a four-level double lambda scheme. Using slow light based on electromagnetically induced transparency, we obtain a slowed four-wave mixing signal pulse together with the slowed probe pulse. During the propagation of light pulses, the storage and retrieval of both the slowed four-wave mixing pulse and the slowed probe pulse are studied by manipulating the intensities of the control fields. 相似文献
54.
R. Yu. Amenzadeh E. T. Kiyasbeyli L. F. Fatullaeva 《Mechanics of Composite Materials》2006,42(3):243-252
The loss of the load-carrying capacity of a nonlinearly elastic multilayer rod is investigated. The rod, whose layers have
various thickness and are made of different materials, is rigidly fixed at both its ends. Rigid contact conditions between
the layers are assumed. The problem posed is solved by using the variational method of mixed type in combination with the
Rayleigh-Ritz method. The initial analysis is reduced to the solution of the Cauchy problem for a nonlinear ordinary differential
equation solved for the first derivative. As the initial condition, the maximum initial eccentricity of the rod is assumed.
In the case of zero eccentricity, the Shanley critical force for an axially compressed rod is determined. For a three-layer
rod whose outer layers have equal thickness and are made of the same material, numerically, for various degrees of nonlinearity,
the effect of physicomechanical and geometric parameters on the critical load of buckling instability is determined. It is
found that, by matching the heterogeneity of the rod, it is possible to raise its load-carrying capacity.
__________
Translated from Mekhanika Kompozitnykh Materialov, Vol. 42, No. 3, pp. 347–360, May–June, 2006. 相似文献
55.
W. Langbein P. Borri U. Woggon M. Schwab M. Bayer S. Fafard Z. Wasilewski P. Hawrylak V. Stavarache D. Reuter A.D. Wieck 《Physica E: Low-dimensional Systems and Nanostructures》2005,26(1-4):400
We measure the dephasing time of the exciton ground state transition in InGaAs quantum dots (QD) and quantum dot molecules (QDM) using a sensitive four-wave mixing technique. In the QDs we find experimental evidence that the dephasing time is given only by the radiative lifetime at low temperatures. We demonstrate the tunability of the radiatively limited dephasing time from 400 ps up to 2 ns in a series of annealed QDs with increasing energy separation of 69–330 meV from the wetting layer continuum. Furthermore, the distribution of the fine-structure splitting δ1 and of the biexciton binding energy δB is measured. δ1 decreases from 96 to with increasing annealing temperature, indicating an improving circular symmetry of the in-plane confinement potential. The biexciton binding energy shows only a weak dependence on the confinement energy, which we attribute to a compensation between decreasing confinement and decreasing separation of electron and hole. In the QDM we measured the exciton dephasing as function of interdot barrier thickness in the temperature range from 5 to 60 K. At 5 K dephasing times of several hundred picoseconds are found. Moreover, a systematic dependence of the dephasing dynamics on the barrier thickness is observed, showing how the quantum mechanical coupling in the molecules affects the exciton lifetime and acoustic-phonon interaction. 相似文献
56.
Yu. V. Zakharov K. G. Okhotkin N. V. Filenkova A. Yu. Vlasov 《Journal of Applied Mechanics and Technical Physics》2007,48(1):126-134
An exact solution is obtained for the nonlinear bending problem of a thin rod elastically fixed at one end and loaded by a
transverse concentrated load of constant direction at the other end. The solution is written in parametric form and expressed
in terms of the Jacobi elliptic functions. Based on the exact solutions, approximate formulas are proposed for the de.ection
of the rod tip.
__________
Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 48, No. 1, pp. 151–160, January–February, 2007. 相似文献
57.
四波混频(FWM)是石英光纤中的一种重要的非线性光波相互作用,在频分复用(FDM)和波分复用(WDM)光纤通信系统中,四波混频引起的信道间的串话和白噪音远远大于受激喇曼(SRS)串扰,并且四波混频(FWM)能够有效地产生新频率光波,因而受到极大关注;本文详细分析了在CW泵浦下单色光在石英单模光纤中的四波混频。推导出四波混频新光波的功率的解析式,其中考虑了泵浦波的自相位调制(SPM)和交叉相位调制(CPM)对四波混频光波功率的影响,并对其进行了数值模拟。 相似文献
58.
Seoung Hun Lee 《Optics Communications》2011,284(19):4683-4686
We introduce a new measurement method of the nonlinear coefficient (NC) of a highly nonlinear fiber based on a four-wave mixing (FWM) technique. The NC along with the fiber's zero-dispersion wavelength (ZDW) was determined from the precise measurement of the pump power dependent optimum pump frequency for peak FWM signal generation conditions. The measurement errors of the NC and ZDW values determined with this method were less than 4.6% and 0.051 nm, respectively. 相似文献
59.
Kousik Mukherjee 《Optik》2011,122(13):1188-1194
A novel frequency encoded all optical half adder, half subtractor and full adder are proposed. The implementation is ultrafast one and the frequency encoding makes it intensity loss dependent problem free. The use of polarization insensitive four-wave mixing makes the design polarization independent and the hardware simple. The frequency conversion by the reflective semiconductor optical amplifiers (RSOA) makes the design faster compared to other semiconductor optical amplifiers (SOA) based design. 相似文献
60.