We consider the possible effects of gravitational lensing by globular clusters on gravitational waves from asymmetric neutron stars in our galaxy. In the lensing of gravitational waves, the long wavelength, compared with the usual case of optical lensing, can lead to the geometrical optics approximation being invalid, in which case a wave optical solution is necessary. In general, wave optical ...

An interference analysis for double-grating shearing interferometry called coherent gradient sensing is presented, and the results are compared with an earlier geometrical optics analysis and a Fourier optics analysis based on the Fresnel approximation. The influence of the order of approximation in these analyses and the equivalence of fringe interpretation in each case are discussed.

Possible approaches to thermal wave based measurement of thermal diffusivity are considered. The calculation of the transverse photodeflection signal in the framework of wave optics prove to be a more accurate approach compared to that of geometrical optics. The influence of the account of wave optical effects on the accuracy of the thermal diffusivity determination is theoretically analyzed un...

Silicon oxynitride-based arrayed waveguide grating (AWG) spectrometers were designed for on-chip spectral-domain optical coherence tomography (OCT) systems and Raman spectroscopy of the skin. A novel geometrical layout for Raman spectroscopy was introduced to reduce loss. Measurements show that integrated optics has a good potential for miniaturizing current OCT systems. Keywords-arrayed wavegu...

We study the propagation of an acoustic wave in a moving fluid in the high frequency regime. We calculate a high-frequency approximation of the solution of this problem using an Eulerianmethod. The model retained is a linearized Euler system around a mean fluid flow. For any regular mean flow, we derive a conservative transport equation for the geometrical optics approximation. We introduce the...

1. Schwartz SH. Geometrical and Visual Optics. 3rd ed. New York: Mc Graw Hill; 2019. Google Scholar

1. Geometrical Optics 1.1 Fermat’s Principle and Law of Refraction 1.2 First Order Optics 1.3 Aberrations 2. Wave Optics 2.1 Diffraction 2.2 Young’s Double Slit 2.3 Interferometers and Coherence of Light Sources 3. Photon or Quantum Optics 4. Optical Instruments 4.1 Magnifiers 4.2 Ophthalmic Lenses 4.3 Telescopes and Microscopes 4.4 Medical Optical Instruments 4.5 Projectors 5. Optical Metrolog...