Statistical distribution of optical losses in bare substrates and thin films through increasing spatial windows

Alexandre Gatto; Mireille Commandre; Pierre J. Roche

doi:10.1117/12.360081

7 September 1999 Statistical distribution of optical losses in bare substrates and thin films through increasing spatial windows

Alexandre Gatto, Mireille Commandre, Pierre J. Roche

Author Affiliations +

Proceedings Volume 3738, Advances in Optical Interference Coatings; (1999) https://doi.org/10.1117/12.360081
Event: Optical Systems Design and Production, 1999, Berlin, Germany

Abstract

The knowledge of the statistical and spatial distributions of optical absorption and scattering can give precious information about the size and the event frequency of the defects which may play an important role in laser damage for examples. The surface size to be characterized depends strongly on the application. A high spatial resolution is necessary to study micro defects while large areas have to be scanned to check the whole sample. In this paper we are interested first in multiscale studies of losses. We present some results in which we have changed the explored spatial window while keeping constant the spatial resolution. Furthermore we have tested the lateral spatial resolution of absorption mapping by photothermal deflection. A 5 micrometers - pattern with a high absorption contrast can be displayed by using a pump beam of 10 micrometers and a sampling step of 5 micrometers in spite of a probe beam of 28 micrometers . We have obtained the same result with a 3 micrometers -pattern of low absorption contrasts by using a pump beam of 3 micrometers and a sampling step of 2 micrometers . These experiments show that the spatial resolution is determined in a rough approximation by the pump beam diameter.

Citation Download Citation

Alexandre Gatto, Mireille Commandre, and Pierre J. Roche "Statistical distribution of optical losses in bare substrates and thin films through increasing spatial windows", Proc. SPIE 3738, Advances in Optical Interference Coatings, (7 September 1999); https://doi.org/10.1117/12.360081

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available