Variation of structured laser beam pattern and optimization for an alignment reference line creation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F23%3A00584155" target="_blank" >RIV/61389021:_____/23:00584155 - isvavai.cz</a>

Alternative codes found

RIV/46747885:24220/23:00011466 RIV/46747885:24510/23:00011466

Result on the web

<a href="https://opg.optica.org/oe/fulltext.cfm?uri=oe-31-26-43307&id=544211" target="_blank" >https://opg.optica.org/oe/fulltext.cfm?uri=oe-31-26-43307&id=544211</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1364/OE.503016" target="_blank" >10.1364/OE.503016</a>

Result language

angličtina

Original language name

Variation of structured laser beam pattern and optimization for an alignment reference line creation

Original language description

The alignment of particle accelerators demands a dedicated measurement system based on a straight-line reference. This straight line can be provided by a laser beam. The alignment then involves accurately measuring the offset of accelerator components with respect to this light path. In order to be efficient, the laser beam needs to serve as a stable and straight reference for distances of several hundreds of meters. The attainable accuracy depends, among other parameters, on the laser spot size, which should ideally change very little over the distances at which the alignment system needs to operate. Due to the significant divergence of Gaussian laser beams, we propose using a structured laser beam (SLB) for alignment. Its transversal intensity profile is similar to a Bessel beam and consists of an intense inner core (IC) and concentric rings. The divergence of the IC, i.e., the growth of its size with distance, can be limited to 10 µrad using a favorable generator configuration. Thus an SLB may be suitable as a straight-line reference for long-distance alignment applications. However, the SLB is distorted if obstructions cover parts of the outermost ring (OR) of the beam within, which should therefore also be small. In this paper, we investigate the relationship between the size of the IC and OR depending on the design parameters of the SLB generator. We use numerical simulations and experiments with different generators over distances up to 50 m to analyze the transversal intensity profile and wavefronts of different SLBs. The results indicate the general suitability of an SLB as a reference line for long-distance alignment but also expose tradeoffs between small IC and small OR. The findings outlined in the paper help to describe the optimal SLB parameters for given conditions.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Optics Express

ISSN

1094-4087

e-ISSN

—

Volume of the periodical

31

Issue of the periodical within the volume

26

Country of publishing house

US - UNITED STATES

Number of pages

16

Pages from-to

43307-43322

UT code for WoS article

001155149700006

EID of the result in the Scopus database

2-s2.0-85178999842