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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Nonresonant cascaded acousto-optic mode coupling.

Jianhui Zhao¹, Ren Miao, Xiaoming Liu

¹Department of Electronic Engineering, Tsinghua University, Beijing, China. zhaojh01@mails.tsinghua.edu.cn

|September 14, 2006

Summary

Nonresonant cascaded acousto-optic mode coupling enables efficient light conversion. This study demonstrates a novel method for converting light modes using a single acoustic frequency, achieving phase matching overall, not per stage.

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Area of Science:

Optics
Acousto-Optics
Materials Science

Background:

Acousto-optic mode coupling is crucial for controlling light propagation in optical fibers.
Traditional methods often require precise phase matching at each coupling stage, limiting efficiency and applicability.
Nonresonant cascaded processes offer an alternative but require careful theoretical and experimental investigation.

Purpose of the Study:

To present a novel nonresonant cascaded acousto-optic mode coupling scheme.
To achieve efficient light mode conversion under an overall phase-matching condition.
To theoretically predict and experimentally demonstrate the conversion of LP(01) to LP(21) and LP(02) modes using a single acoustic frequency.

Main Methods:

Theoretical modeling of nonresonant cascaded acousto-optic mode coupling.
Experimental setup utilizing a single acoustic frequency to drive mode conversion.
Characterization of optical modes and phase-matching conditions.

Main Results:

Demonstration of nonresonant cascaded acousto-optic mode coupling.
Achieved phase matching through the summation of acoustic momenta, compensating for detuning across stages.
Successful experimental conversion from the LP(01) mode to LP(21) and LP(02) modes.

Conclusions:

The presented nonresonant cascaded acousto-optic mode coupling is a viable method for efficient light mode conversion.
This approach overcomes limitations of traditional methods by satisfying phase matching overall, not per stage.
The experimental validation confirms the theoretical predictions, opening new avenues for optical signal processing.