Photoinduced Birefringent Grating Research Articles

Holographic grating recording in azobenzene polymer films

Abstract The photo-induced birefringence grating and the surface grating in azobenzene polymer films were studied. The photo-induced birefringence (about 0.02 at 633 nm) was investigated at various intensities of laser (532 nm) beam. The effect of laser-induced heating has been introduced to the processes of photo-induced reorientation in azo polymer. The holographic grating period and the peak-to-peak value of the sinusoidal surface profile are 0.8 mm and 40 nm, respectively. The maximum diffractive efficiency of the grating is 2%. The mass diffusion responsible for the formation of the surface grating due to the temperature rise is analyzed.

Proposal of a novel resonator fiber-optic gyro with fiber grating loop

We propose a novel resonator fiber-optic gyro, which employs a polarization-maintaining fiber-ring resonator with a photoinduced birefringent fiber grating. A theoretical study of the polarization-fluctuation-induced bias of a resonator fiber-optic gyro (R-FOG) is presented. The polarization conversion due to the photoinduced birefringent grating can stabilize the resonator output, which results in the reduction of the bias in the R-FOG output. The influences of the parameters, such as the fluctuation of the input polarization, the resonator finesse, and the photoinduced index change of the dielectric tensor, on the bias of the gyro output have been investigated. © 1996 John Wiley & Sons, Inc.

Bias of a resonator fiber optic gyro composed of a polarization-maintaining fiber ring resonator with the photoinduced birefringent grating

A theoretical study of the polarization-fluctuation induced bias of an resonator fiber optic gyro (R-FOG), which employs a polarization-maintaining fiber ring resonator with a photoinduced birefringent grating, is presented. The polarization conversion due to the photoinduced birefringent grating can stabilize the resonator output, which result in the reduction of the bias in the R-FOG output. The influences of the parameters, such as the fluctuation of the input polarization, the resonator finesse, and the photoinduced index change of the dielectric tensor, on the bias in the gyro-output have been investigated. Our results show that with the help of a photoinduced birefringent grating the bias in the gyro-output can be limited around 10/sup -7/ rad/s (0.02 deg/hr), a typical specification for the aircraft-navigation.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Fabry–Perot resonator composed of a photoinduced birefringent fiber grating

The periodic mode coupling between the x- and y-polarization modes that is induced by a photoinduced birefringent fiber grating is analyzed through the use of the coupled-mode theory. A novel Fabry-Perot resonator composed of a photoinduced birefringent fiber grating is proposed and theoretically investigated. In the ideal case, the x- and y-polarization resonances of the resonator coincide with each other because of the polarization power exchange by the photoinduced birefringent grating, which results in the total resonator output's being polarization independent. However, if there are some external perturbations (e.g., temperature change or strain), the phase matching is detuned, which could destroy the coincidence between the two polarization resonances, which can further result in the total output resonance's having two peaks. The separation between these two resonant peaks depends on perturbations of the environment (temperature changes or strain).

Polarization-maintaining fiber ring resonator with a photoinduced birefringent grating

A theoretical study of polarization outputs of a polarization-maintaining fiber ring resonator with a photoinduced birefringent grating written in the whole fiber loop is presented. The polarization conversion due to the photoinduced birefringent grating can stabilize the resonator output, especially the separation between the resonance points. The dependence of the parameters of the photoinduced birefringent grating on the polarization output of the ring resonator is investigated.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>