Laser-beam characterization by means of modal decomposition versus M2 method

Oliver A. Schmidt; Thomas Kaiser; Barbara Lüdge; Siegmund Schröter; Michael Duparré

doi:10.1117/12.810466

19 February 2009 Laser-beam characterization by means of modal decomposition versus M² method

Oliver A. Schmidt, Thomas Kaiser, Barbara Lüdge, Siegmund Schröter, Michael Duparré

Proceedings Volume 7194, Laser Resonators and Beam Control XI; 71940C (2009) https://doi.org/10.1117/12.810466
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

Modal decomposition by means of correlation filters has been proved as a key for real online laser beam analysis. To compare that method with the "standard" M² method, we generated series of different laser beams (1064 nm), applied both methods to one and the same beam and evaluated achieved results. An adjustable Nd:YAG laser served as transversal mode generator, delivering diverse "pure" Gauss-Hermite modes and superpositions of modes, respectively. In the case of incoherent superposition of modes, their particular contribution to the general M² value should be proportional to their relative strength, whereas in the case of coherent superposition M² is distinctly influenced by phase differences between the discrete modal components. Achieved experimental findings are well confirmed by computer simulation.

Citation Download Citation

Oliver A. Schmidt, Thomas Kaiser, Barbara Lüdge, Siegmund Schröter, and Michael Duparré "Laser-beam characterization by means of modal decomposition versus M² method", Proc. SPIE 7194, Laser Resonators and Beam Control XI, 71940C (19 February 2009); https://doi.org/10.1117/12.810466

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