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Updated: Jul 6, 2026

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate

Published on: June 18, 2020

Conoscopic interferometry of surface-acoustic-wave substrate crystals.

P H Ayräs¹, A T Friberg, M A Kaivola

¹Materials Physics Laboratory, Helsinki University of Technology, PO Box 2200 ~Technical Physics, FIN-02015 HUT Espoo, Finland.

|March 8, 2008

Summary

This summary is machine-generated.

Conoscopic interferometry effectively determines crystal orientation for lithium niobate substrates, crucial for optical and acoustic devices. This low-cost lab method excels with birefringent materials like niobate.

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Area of Science:

Materials Science
Optoelectronics
Crystallography

Background:

Accurate crystal orientation is vital for fabricating high-performance integrated-optic and surface-acoustic-wave devices.
Lithium niobate is a key substrate material due to its unique electro-optic and piezoelectric properties.

Purpose of the Study:

To evaluate the applicability of conoscopic interferometry for determining the crystal orientation of substrate wafers.
To assess the method's sensitivity for different crystalline materials, particularly lithium niobate.

Main Methods:

Conoscopic interferometry was employed to analyze the interference patterns produced by polarized light passing through crystalline substrates.
The technique focused on identifying the orientation of the optic axes within the crystal structure.

Main Results:

Conoscopic interferometry proved effective for determining the crystal orientation of lithium niobate substrates.
The method demonstrated high sensitivity for strongly birefringent materials like lithium niobate.
Lower sensitivity was observed for lithium tantalate and quartz compared to lithium niobate.

Conclusions:

Conoscopic interferometry is a viable, low-cost, and user-friendly technique for crystal orientation determination in laboratory settings.
The method is particularly well-suited for substrates like lithium niobate used in advanced optical and acoustic device fabrication.