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Research on the characteristics of Klein–Cook parameter and diffraction efficiency of acousto-optic interaction for low-frequency ultrasonic in the liquid

Gao Jing, Han Guang, Zhu Jianzhuo

Optica Applicata

2021

Vol. 51, nr 3

445--456

We have investigated the characteristics of acousto-optic interaction for low-frequency ultrasonic wave in a liquid. Based on the coupling wave equation of acousto-optic interaction, the diffraction light characteristics for normal incidence at small parameter Q have been discussed. The parameter Q with respect to acousto-optic interaction length, ultrasonic frequency, water temperature, and the concentration of sucrose solution have been analyzed, which is an important physical quantity and reflects the degree of mismatch in the acousto-optic interaction. The diffraction efficiencies for different parameters Q, incident angles and phase shifts have been calculated. The results of our work provide theoretical basis for further study of the acousto-optic effect in the liquid.

Tuning of suitable solar spectrum onto photocatalytic materials of the matched band gap using optical engineering

Ranjan R, Ghosh A, Nirala A K, Yadav H L

Optica Applicata

2015

Vol. 45, nr 2

237--247

In this report, we have carried out work on the concept of optical engineering for tuning solar spectrum onto photocatalytic materials of the matched band gap using a holographic concentrator. Processing parameters of holographic concentrators have been designed suitably to have a control over the desired wavelength range for photocatalytic materials of the matched band gap.

Diffraction properties of transmission binary blazed grating

Zhou H.J., Wang Q. Q.

Optica Applicata

2006

Vol. 36, nr 1

105-109

The properties of binary blazed grating were theoretically analyzed with finite-difference time-domain (FDTD) method. The diffraction efficiencies and diffraction angles of -1, 0, and +1 order for the grating varying with wavelength, grating structure, and the etch depth were studied when the incident angle was 30°. The numerical simulations revealed that the binary blazed grating presented high stability of diffraction efficiencies with wavelength shift.