Lithium niobate crystals

[abbasdalvi7]

TL;DR Summary

Need help to determine axis orientation of lithium niobate.

Hey, So I have periodically poled lithium niobate crystals in X-cut but they didnt come with orientation flats. I need to determine the orientation of the crystals with non destructive methods.

 

[Astronuc]

TL;DR Summary: Need help to determine axis orientation of lithium niobate.

So I have periodically poled lithium niobate crystals in X-cut but they didnt come with orientation flats.

What is the geometry of the crystals? Does the certification (or certificate of compliance) state a crystal orientation with respect to the geometry?

Has one contacted the supplier with regard to the crystal orientation?

NDT techniques would be X-ray diffraction (XRD) or Electron backscatter diffraction (EBSD).

 

[DaveE]

It's birefringent, you should be able to tell with polarized light.

 

[Astronuc]

It's birefringent, you should be able to tell with polarized light.

I had wondered about that.

Some references on characterizing LiNbO₃crystals and thin films.

https://www.mdpi.com/2073-4352/11/3/288

https://www.researchgate.net/profil...es-by-means-of-XRD-and-Raman-spectroscopy.pdf

https://www.sciencedirect.com/science/article/pii/S1044580316300924

EBSD in general
https://www.ebsd.com/ebsd-for-beginners/automated-ebsd