The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform

Gerd Leuchs - One of the best experts on this subject based on the ideXlab platform.

  • direct schmidt number measurement of high gain parametric down conversion
    Laser Physics Letters, 2015
    Co-Authors: I V Dyakonov, P R Sharapova, Sh T Iskhakov, Gerd Leuchs
    Abstract:

    In this work we estimate the transverse Schmidt number for the bipartite high-gain parametric down conversion state by means of second-order Intensity Correlation Function measurement. Assuming that the number of modes is equal in both beams we determine the Schmidt number considering only one of the subsystems. The obtained results demonstrate that this approach is equally efficient over the whole propagation of the state from the near field to the far field regions of its emitter.

  • direct schmidt number measurement of high gain parametric down conversion
    arXiv: Quantum Physics, 2014
    Co-Authors: I V Dyakonov, P R Sharapova, Sh T Iskhakov, Gerd Leuchs
    Abstract:

    In this work we estimate the transverse Schmidt number for the bipartite bright squeezed vacuum state by means of second-order Intensity Correlation Function measurement. Assuming that the number of modes is equal in both beams we determine the Schmidt number considering only one of the subsystems. The obtained results demonstrate that this approach is equally efficient over the whole propagation of the state from the near field to the far field regions of its emitter.

Gunnar Björk - One of the best experts on this subject based on the ideXlab platform.

Mei Dong-cheng - One of the best experts on this subject based on the ideXlab platform.

Wu Da-jin - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Noise on Time Evolution of Intensity Correlation Function
    Communications in Theoretical Physics, 2005
    Co-Authors: Cheng Qing-hua, Xu Da-hai, Wu Da-jin
    Abstract:

    Using the linear approximation method, we have studied how the Correlation Function C(t) of the laser Intensity changes with time in the loss-noise model of the single-mode laser driven by the colored pump noise with signal modulation and the quantum noise with cross-Correlation between the real and imaginary parts. We have found that when the pump noise self-Correlation time ? changes, (i) in the case of ? 1, the C(t) vs. t curve experiences a changing process from the monotonous descending to monotonous rise, and finally to the appearance of a maximum; (ii) in the case of ? 1, the curve only exhibits periodically surging with descending envelope. When ? 1 and ? does not change, with the increase of the pump noise Intensity P, the curve experiences a repeated changing process, that is, from the monotonous descending to the appearance of a maximum, then to monotonous rise, and finally to the appearance of a maximum again. With the increase of the quantum noise Intensity Q, the curve experiences a changing process from the monotonous rise to the appearance of a maximum, and finally to the monotonous descending. The increase of the quantum noise with cross-Correlation between the real and imaginary parts will lead to the fall of the whole curve, but not affect the form of the time evolution of C(t).

  • Intensity Correlation Function of a Single-Mode Laser Driven by Colored Cross-Correlation Noises in Modulation of a Bias Signal
    Communications in Theoretical Physics, 2005
    Co-Authors: Yang Hong-quan, Wu Da-jin
    Abstract:

    By using the linear approximation method, the Intensity Correlation Function is calculated for a single-mode laser modulated by a bias signal and driven by colored pump and quantum noises with colored cross-Correlation. We found that, when the Correlation time between the two noises is very short, the behavior of the Intensity Correlation Function versus the time, in addition to decreasing monotonously, also exhibits several cases, such as one maximum, one minimum, and two extrema. When the Correlation time between the two noises is very long, the behavior of the Intensity Correlation Function exhibits oscillation and the envelope is similar to the case of short cross-Correlation time.

  • Intensity Correlation Function of a Single-Mode Laser Driven by Two Colored Noises with Colored Cross-Correlation*
    Communications in Theoretical Physics, 2004
    Co-Authors: Wu Da-jin, Wang Jun
    Abstract:

    By using the linear approximation method, the Intensity Correlation Function and the Intensity Correlation time are calculated in a gain-noise model of a single-mode laser driven by colored cross-correlated pump noise and quantum noise, each of which is colored. We detect that, when the cross-Correlation between both noises is negative, the behavior of the Intensity Correlation Function versus time , in addition to decreasing monotonously, also exhibits several other cases, such as one maximum, one minimum, and two extrema (one maximum and one minimum), i.e., some parameters of the noises can greatly change the dependence of the Intensity Correlation Function upon time. Moreover, we find that there is a minimum in the curve of the Intensity Correlation time versus the pump noise Intensity, and the depth and position of strongly depend on the quantum noise self-Correlation time and cross-Correlation time .

Bing Wang - One of the best experts on this subject based on the ideXlab platform.

  • Normalized Intensity Correlation Function of single-mode laser system driven by colored cross-Correlation noises
    Chinese Optics Letters, 2008
    Co-Authors: Bing Wang
    Abstract:

    Considering a single-mode laser system with cross-correlated additive colored noise and multiplicative colored noise, we study the effects of Correlation among noises on the normalized Intensity Correlation Function C(s). C(s) is derived by means of the projection operator method. The effects of the self-Correlation time tau1 of the additive colored noise, tau2 of the multiplicative colored noise, and the effect of the cross-Correlation time tau0 between the two noises on C(s) are discussed by numerical calculation. For the case of positive Correlation (\lambdag0), it is found that when a0g0 the normalized Intensity Correlation Function C(s) increases with the increase of tau0 or tau2, and with value of tau0 or tau2 becoming larger, C(s) comes to saturation. With increasing the self-Correlation time tau1 of the additive noise, a minimum and a maximum will appear on curve of C(a) as a0g0. If a0l0, C(s) decreases with the increase of tau0, tau1, and tau2.

  • Study of the normalized Intensity Correlation Function of a single-mode laser system with colored cross-correlated noises
    Chinese Optics Letters, 2007
    Co-Authors: Bing Wang
    Abstract:

    A single-mode laser system with colored cross-correlated additive and multiplicative noise terms is considered. By the means of projection operator method, we study the effects of the cross-Correlation time 'tau' and the cross-Correlation Intensity 'lambda' between noises on the normalized Intensity Correlation Function C(s). It is found that if 'lambda'g0 ('lambda'l0), the normalized Intensity Correlation Function C(s) increases (decreases) with increasing the cross-Correlation time 'tau', and at large value of 'tau', the variation of the normalized Intensity Correlation Function C(s) becomes small. With the increase of the net gain a0, C(s) exhibits a maximum when 'lambda' is larger. However, a minimum and a maximum appear on C(s) curves with the increase of a0 when 'lambda' becomes smaller and smaller.

  • Effects of cross-correlated noises on the Intensity fluctuation of the single-mode laser system
    Chinese Optics Letters, 2006
    Co-Authors: Bing Wang, Shuwen Dai
    Abstract:

    A single-mode laser model with cross-correlated additive and multiplicative noise terms is considered, and the effects of Correlation between noises on the relaxation time and the Intensity Correlation Function are studied. Using the projection operator method and taking into account the effects of the memory kernels of the Intensity Correlation Function, the analytic expressions for the relaxation time and the Correlation Function are derived. Based on numerical computations, it is found that the self-Correlation time and the cross-Correlation time have the same effects on the single-mode laser system.