Understanding Laser Beam Quality Beyond M2
| Autor: | Y. G. Soskind, M. Soskind |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Beam diameter Distributed feedback laser business.industry 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Beam parameter product law.invention 010309 optics Laser linewidth Optics law 0103 physical sciences Physics::Accelerator Physics M squared Laser beam quality Laser power scaling 0210 nano-technology business |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2237354 |
| Popis: | The laser beam M 2 quality parameter is based on the second moments’ theory, as defined by ISO standards, and provides a common approach for defining the propagation characteristics of laser beams as a whole. At the same time, the M 2 parameter fails to quantitatively distinguish the quality of laser beams with different spatial characteristics. For example, several laser beams with very different spatial profiles may have the same M 2 value. To overcome this ambiguity, a different beam quality criterion is introduced, allowing for a quantitative definition of both the structured laser beam shape and its propagation characteristics. This criterion, called the encircled power M 2 (EPM 2 ), bridges the gap between the M 2 quality parameter and the structured laser beam shape. Based on several examples we demonstrate the utility of EPM 2 as applied to characterization of several structured laser beam types. |
| Databáze: | OpenAIRE |
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