We investigate second-harmonic generation (SHG) from aperiodic optical superlattices in the regime of pump depletion, where the influence of typical fabrication errors which can be introduced by the random -fluctuation of the thic

We use fundamental matrix (F-matrix) method derived from coupled wave theory to simplify the diffraction simulation of chirped volume Bragg grating (CVBG) and it can be applied to arbitrary grating phase profiles. With the F-matri

In order to solve the difficulty of testing large mirror, the sub-aperture stitching interferometry (SSI) is proposed and expatiated. The basic theory and principle of this method are introduced and analyzed. A reasonable stitchin

Alignment and testing of optical axis parallelism are the key problems in alignment of a multi-optical axis system. We propose a method which can adjust optical axis parallelism and single-channel wavefront aberration simultaneous

We study the decoding performance of low-density parity-check (LDPC) code based on Watermark scheme under different percentages of water-mark bits over 100 Gb/s differential quadrature phase shift keying (DQPSK) high-speed optical

In order to improve the bandwidth and ability to resist electromagnetic interference of phased array antenna, we use the real-time delay technology of optical fiber. By using phase control principle of optically controlled phased

We investigate optimal twin-hole poling optical fiber configurations, including distances between core and each electrode, and poling voltage based on the two-dimensional charge dynamics model. We propose a poled fiber with optimi

We experimentally demonstrate the multiband orthogonal frequency-division multiplexing ultra-wideband (MB-OFDM UWB) over fiber system with direct detection. Different sub-carrier modulation formats (quadrature phase shift keying (

We present an improved compressive sensing algorithm with negative transformation and piecewise-nonlinear transformation. The reconstruction characteristics of the improved algorithm are studied by conducting numerical analysis re

We build up a common-path optical coherence tomography (OCT) system using reflected light of sample surface as reference light. As the zero path length reference point has nothing to do with the distance between probe and organ, i

We theoretically study the optimum design of anisotropic acousto-optic modulator (AOM) based on lithium niobate crystal. Four different kinds of operating modes in the XOZ and YOZ acousto-optic (AO) planes are systematically analy

We present a theory to investigate the existence and the propagation properties of incoherently coupled single-hump and dipole soliton pairs in self-defocusing media with parity-time symmetric lattice. These soliton pairs can exis

Based on the general mechanism of the coherent population oscillations, we propose the fundamental -harmonic fractional delay (FHFD) to evaluate the superluminal and slow light propagation in semiconductor optical amplifier (SOA).

Aspheric elements are widely applied in optical systems and the vertex radius of curvature (VROC) is one of the important fundamental parameters of an asphere. We present a method for measuring the VROC of asphere. We use a portab

In order to obtain precise optical free-form convex mirror, we present a perfect process specification for fabricating and testing optical free-form convex mirror. Some technical requirements of 84×84 (mm) optical free-form convex

Silicon carbide (SiC) is a wide bandgap semiconductor which exhibits outstanding mechanical, chemical properties, and potential for a wide range of applications. Laser technology is being established as an -indispensable powerful

We study a convex off-axis aspheric mirror which works as secondary mirror in space optical system. The parameters of the mirror are described. In order to test the surface error, the mirror is made up of fused silicon and is test

We present a simple method for the subsurface imaging of a nucleated cell, which is realized by measuring the difference in wrapped phase between a nucleated cell and its enucleated cell model. The latter one called as the referen

We present a method to extract foreground object regions efficiently from image sequences. Scale-invariant feature transform algorithm is adopted to estimate the descriptor firstly by matching between two consecutive frames. Given

Phase diversity (PD) is a kind of wavefront sensing technology based on image collecting and post-processing. We apply the PD technology to align an off-axis three-mirror reflecting anastigmatic system precisely. It can be conclud

We propose a Y-type polarization beam splitter based on internal polarization-selective defects within crystal waveguides in a two-dimensional square-lattice photonic crystal with solid rods. When the nonpolarized light launches f

We theoretically study the nonlinear surface wave propagation at the interface between superconductor media and nonlinear metamaterials. The dispersion equation is analytically derived and solved numerically. Moreover, we present

We describe a compact beam splitter based on grating-assisted coupler which consists of Bragg grating sandwiched between two parallel waveguides on the silicon-on-insulator platform. The coupled-mode theory is an important method