A method for measuring the width of a focused laser beam in reflection

Jun Lu; Heng Lu; Antoine Reserbat-Plantey; Chen Yang; Ye Tian; Ying Yan; Joel Moser

doi:10.1117/12.2574614

5 November 2020 A method for measuring the width of a focused laser beam in reflection

Jun Lu, Heng Lu, Antoine Reserbat-Plantey, Chen Yang, Ye Tian, Ying Yan, Joel Moser

Proceedings Volume 11562, AOPC 2020: Advanced Laser Technology and Application; 1156205 (2020) https://doi.org/10.1117/12.2574614
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

We present a simple method to measure the width of a focused laser beam, where we define the width as the radius of the beam at which the intensity is 1/e2 of its on-axis value. Our method is based on measuring the power of light reflected off a metallized microstructure patterned on a oxidized silicon substrate that is placed on a tri-dimensional positioner. As the boundary between the microstructure and the substrate is scanned across the beam, changes in reflected power provide a quantitative measurement of the width of the beam. Our method is a useful alternative to the knife edge technique if optical measurements in transmission are not possible.

Citation Download Citation

Jun Lu, Heng Lu, Antoine Reserbat-Plantey, Chen Yang, Ye Tian, Ying Yan, and Joel Moser "A method for measuring the width of a focused laser beam in reflection", Proc. SPIE 11562, AOPC 2020: Advanced Laser Technology and Application, 1156205 (5 November 2020); https://doi.org/10.1117/12.2574614

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