In the paper investigated are optically inhomogeneous objects using holographic interferometry, speckle-interferometry and optical correlation. A non-interferometricshift of interference fringes is observed. Shown is that the shift is related to the statistical distribution that describes the optical inhomogeneity of the objects of study.
New approach for the correlation technique, which is based on multiple periodic structures to create a controllable angular spectrum, is proposed and investigated both theoretically and experimentally. The transformation of an initial laser beam occurs due to the actions of consecutive phase periodic structures, which may differ by their parameters. Then, after the Fourier transformation of a complex diffraction field, the output diffraction orders will be changed both by their intensities and by their spatial position. The controllable change of output angular spectrum is carried out by a simple control of the parameters of the periodic structures. We investigate several simple examples of such management.
In a frequency-modulation spectroscopy experiment, using the radiation from a single frequency diode laser, the
spectra of molecular iodine hyperfine structure near 640 nm were recorded on the transition B3Π+0u- X1Σ+g .
The frequency reference given by the value of the modulation frequency (12.5 MHz in given experiment) allows
determination of the frequency differences between hyperfine components with accuracy better than 0.1 MHz
using the fitting procedure in experiment with only one laser.
We investigate the coherent population trapping (CPT) resonances excited in rubidium atoms by the femtosecond
optical comb in magnetic field. The light shift of resonances was observed and studied.
This report concentrates on dynamic probabilistic risk analysis of optical elements for complex characterization
of damages using physical model of solid state lasers and predictable level of ionizing radiation and space weather.
The following main subjects will be covered by our report: (a) a solid-state laser model; (b) mathematical models
for dynamic probabilistic risk assessment; and (c) software for modeling and prediction of ionizing radiation. A
probabilistic risk assessment method for solid-state lasers is presented with consideration of some deterministic
and stochastic factors. Probabilistic risk assessment is a comprehensive, structured, and logical analysis method
aimed at identifying and assessing risks in solid-state lasers for the purpose of cost-effectively improving their
safety and performance. This method is based on the Conditional Value-at-Risk measure (CVaR) and the
expected loss exceeding Value-at-Risk (VaR). We propose a new dynamical-information approach for radiation
damage risk assessment of laser elements by cosmic radiation. Our approach includes the following steps: (a)laser
modeling, modeling of ionizing radiation influences on laser elements, (b) probabilistic risk assessment methods,
and (c) risk minimization. For computer simulation of damage processes at microscopic and macroscopic levels
the following methods are used: (a) statistical; (b) dynamical; (c) optimization; (d) acceleration modeling, and
(e) mathematical modeling of laser functioning. Mathematical models of space ionizing radiation influence on
laser elements were developed for risk assessment in laser safety analysis. This is a so-called 'black box' or
'input-output' model, which seeks only to reproduce the behaviour of the system's output in response to changes
in its inputs. The model inputs are radiation influences on laser systems and output parameters are dynamical
characteristics of the solid laser.
The report will be devoted to the modelling of damage processes of the optical-cryogenic sensor at microscopic and
macroscopic levels. The sensor is based on a new type of suspension of the probe of a supeconducting gravimeter.
The interferometric method is provided coordinate measurement of the probe. The following main subjects will
be covered by the report: (1) modelling of a supeconducting gravimeter; (2) modeling of a solid-state laser;
(3) computer simulation of damage processes at microscopic and macroscopic levels; (4) response of thin films
to intense short-wavelength radiation; (5) mathematical models for dynamic probabilistic risk assessment; (6)
strategies for the design of optical components, and (7) software for modeling and prediction of ionizing radiation.
For computer simulation of damage processes at microscopic and macroscopic levels the following methods are
used: () statistical; (b) dynamical; (c) optimization; (d) acceleration modeling, and (e) mathematical modeling
of laser functioning. Mathematical models of space ionizing radiation influence on gravimwter elements were
developed for risk assessment in laser safety analysis.
Considered is a correlation method of forming of specified distribution of radiation energy over the target,
particularly in the optical tweezers wand. The method exploits an interaction of beforehand spatially modulated in phase
wand beam with synthesized hologram specific to the modulation. The specified energy distribution is obtained as the
convolution of the required field distribution and of cross-correlation function of the ideal wand beam and the real one.
Because of beams wave fronts modulation the result of such a convolution is weakly dependent on the difference of the
ideal and the real beams. Examined is the possibility of dynamic operation mode involving the spatial light modulation
(SLM) device.
The laser trapping and manipulation by submillimeter size absorbing particles in the laser tweezer is investigated. The stable levitation of graphite, magnetite, tungsten carbide solid particles and its conglomerates was performed in laser trap formed by hollow laser beam focused by long-focal objective. The particles dynamics in the trap at normal and lowered air pressures was studied. The some new applications of laser tweezers with absorbing particles are discussed
The iodine vapor cell is an important element of metrological stabilized lasers. The presence in the cell of foreign gases cases the frequency shifts of hyperfine components of iodine molecule. In this paper we pay the particular attention for the influence of irrelevant iodine isotopes on frequency shifts of hyperfine components and show that cell testing should include the additional sensitive detection of irrelevant iodine isotopes presence.
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