Controlling speckle using lenses and free space
نویسندگان
چکیده
منابع مشابه
Controlling speckle using lenses and free space.
The correlation properties of speckle fields are studied for general paraxial systems. The previous studies on lateral and longitudinal speckle size for the case of free-space propagation (Fresnel transform) are generalized to the case of the linear canonical transform. These results have implications for the control of speckle size, through appropriate design of optical systems, with particula...
متن کاملFractional free space, fractional lenses, and fractional imaging systems.
Continuum extensions of common dual pairs of operators are presented and consolidated, based on the fractional Fourier transform. In particular, the fractional chirp multiplication, fractional chirp convolution, and fractional scaling operators are defined and expressed in terms of their common nonfractional special cases, revealing precisely how they are interpolations of their conventional co...
متن کاملBeam Injection Experiments using Space Charge Lenses
Space charge lenses for ion beam focussing are in theory, especially for singly charged heavy ion beams at low velocities, superior to other lens systems [1]. On the other hand previous experiments [2] have shown, in contrary to the theoretical forecast, a small degree of lens filling and serious emittance growth. Newer experiments [3] demonstrated a much better degree of lens filling and subst...
متن کاملOrbital-angular-momentum-multiplexed free-space optical communication link using transmitter lenses.
In this paper, we explore the potential benefits and limitations of using transmitter lenses in an orbital-angular-momentum (OAM)-multiplexed free-space optical (FSO) communication link. Both simulation and experimental results indicate that within certain transmission distances, using lenses at the transmitter to focus OAM beams could reduce power loss in OAM-based FSO links and that this impr...
متن کاملMultiscale Filtering of Correlated Speckle Using Scale and Space Consistency
ABSTRACT Speckle noise is often correlated due to image post-processing or imperfect imaging transfer function. in order to filter correlated speckle noise in a multiscale framework (stationary wavelet decomposition), we propose two approaches, respectively parametric and non parameteric. The first approach is based on a parametric modelisation of the speckle autocorrelation function using a co...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Optics Letters
سال: 2007
ISSN: 0146-9592,1539-4794
DOI: 10.1364/ol.32.003394