Results 131 to 140 of about 622,419 (187)
Some of the next articles are maybe not open access.
SPIE Proceedings, 1985
Summary The growth of laser applications in a large number of areas, the emergence of optical information processing, and the prospect of optical computing have lead to a need for various types of optical limiters and switches. One such device, the OPL, is the opticalequivalent of the Zener diode.
M. J. Soileau +2 more
openaire +1 more source
Summary The growth of laser applications in a large number of areas, the emergence of optical information processing, and the prospect of optical computing have lead to a need for various types of optical limiters and switches. One such device, the OPL, is the opticalequivalent of the Zener diode.
M. J. Soileau +2 more
openaire +1 more source
Photorefractive Optical Limiting
Photorefractive Effects, Materials, and Devices, 2003Optical limiting has been an attractive research topic for the past decade but no useable device has yet been evidenced. We propose here the design and the testing of an original device based on photorefractive self-focusing in a Sr.6Ba.4Nb2O6crystal. The experimental setup is described and the testing in the real-use condition evidenced.
C. Hesse +4 more
openaire +1 more source
Thermal Limitations in Optical Logic
Applied Optics, 1969The problem of removing the heat produced in logical operations limits the density to which logical elements can be packed in large computers employing many elements. The basic minimum power dissipation in elements that use optical phenomena to perform logic operations is estimated from physical laws.
R W, Keyes, J A, Armstrong
openaire +2 more sources
Fundamental limits of optical microrheology
Journal of Colloid and Interface Science, 2004We estimate the fundamental limits of different microrheological techniques based on optical detection. It is suggested that particle tracking systems using nondifferential detection have a minimum detectable displacement given by 0.2(lambda0/NA)(1/square root of (SNR)), where lambda0 is the wavelength, NA is the numerical aperture of the focusing ...
L E, Helseth, T M, Fischer
openaire +2 more sources
Fundamental limits of optical superresolution
Optics Letters, 1997Increasing the resolving power of optical systems beyond the limits imposed by diffraction, or superresolution, has considerable theoretical as well as practical interest. Several schemes have been proposed to achieve superresolution with reasonable success, but there are no criteria that enable one to determine what improvement can ultimately be ...
T R, Sales, G M, Morris
openaire +2 more sources
High-efficiency multipass optical limiter
Optics Letters, 2003We report experimental results on a highly efficient optical limiter that uses a three-mirror, multipass ring configuration. The optical limiter's enhanced performance is based on the accumulative effect that is achieved when the laser beam passes through the sample several consecutive times.
N M, Neto Barbosa +3 more
openaire +2 more sources
Thermal-defocusing/scattering optical limiter
Optics Letters, 1994Operation of an f/5 thermal-defocusing/scattering optical limiter is described. Thermal-defocusing limiting of 6-ns-duration, 532-nm laser pulses occurs by use of the broadband-absorbing dye Nigrosin dissolved in carbon disulfide. Additional limiting due to thermally induced scattering occurs at high incident fluences (above a threshold fluence) when ...
B L, Justus, A J, Campillo, A L, Huston
openaire +2 more sources
Self-protecting semiconductor optical limiters
Optics Letters, 1988We present a detailed characterization of passive, picosecond optical-power-limiting devices using tightly focused beams in thick semiconductor samples. This study of limiting in ZnSe with 30-psec, 532-nm pulses shows that the resulting internal self-action (two-photon absorption plus free-carrier self-defocusing) protects the bulk material from ...
Hagan, D. J. +4 more
openaire +3 more sources
Optical limiting for microsecond pulses
The Journal of Chemical Physics, 2009We present a dynamical theory of nonlinear absorption and propagation of laser pulses with duration in the microsecond time domain. The general theory is applied to fullerene C60 because of its good optical limiting properties, namely, a rather low ground state absorption and a strong triplet-triplet absorption.
Sergey, Gavrilyuk +4 more
openaire +2 more sources
Quantum Limits on Optical Resolution
Physical Review Letters, 2000We discuss the ultimate limit imposed by quantum fluctuations of light for resolution of fine details in optical images. For this purpose, we extend in the quantum domain the classical analysis of the object reconstruction, or superresolution, in terms of prolate spheroidal function basis.
, Kolobov, , Fabre
openaire +2 more sources