Abstract
The propagation of Gaussian beams is analyzed for an acousto-optic deflector by varying the refractive index in two-dimensions with a row of phased array piezoelectric transducers. Inhomogeneous domains of phase grating are produced by operating the transducers at different phase shifts, resulting in two-dimensional index modulation of periodic and sinc function profiles. Also different phase shifts provide a mechanism to steer the grating lobe in various directions and, therefore, the incident angle of the laser beam on the grating plane is automatically modified without moving the beam. Additionally, the acoustic frequency can be varied to achieve the Bragg condition for the new incident angle of the laser beam so that the diffraction efficiency of the deflector is maximized. The Gaussian beam is expressed in terms of planes and the second order coupled mode theory is implemented to analyze the diffraction of the beam. The diffraction efficiency is found to be nearly unity for optimal operating parameters of the acousto-optic device.
Highlights
Acousto-Optic Deflectors (AODs) are inertialess optical solid state devices to deflect and scan laser beams in numerous applications including microvia drilling in microelectronic industries for advanced high density packaging
The diffraction of Gaussian beams is studied for AODs of finite size with two-dimensional index modulation
To verify the computational accuracy, the normalized intensity of the Gaussian beam is calculated by two approaches that are based on the exact expression of the input beam given by Eq (7) and the spectral representation of the beam given by Eqs. (9) and (11)
Summary
Acousto-Optic Deflectors (AODs) are inertialess optical solid state devices to deflect and scan laser beams in numerous applications including microvia drilling in microelectronic industries for advanced high density packaging. “Two-dimensional refractive index modulation by phased array transducers in acousto-optic deflectors,” Appl.
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