Differential interferometer for measurement of displacement of laser resonator mirrors

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F15%3A00309413" target="_blank" >RIV/68407700:21220/15:00309413 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1117/12.2068728" target="_blank" >http://dx.doi.org/10.1117/12.2068728</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2068728" target="_blank" >10.1117/12.2068728</a>

Result language

angličtina

Original language name

Differential interferometer for measurement of displacement of laser resonator mirrors

Original language description

This paper covers a description and a technique of a possible optical method of mode locking within a laser resonator. The measurement system is a part of instrumentation of laser-based experiment OSQAR at CERN. The OSQAR experiment aims at search of axions, axion-like particles and measuring of ultra-fine vacuum magnetic birefringence. It uses a laser resonator to enhance the coupling constant of hypothetical photon-to-axion conversion. The developed locking-in technique is based on differential interferometry. Signal obtained from the measurement provide crucial information for adaptive control of the locking-in of the resonator in real time. In this paper we propose several optical setups used for measurement and analysis of mutual position of the resonator mirrors. We have set up a differential interferometer under our laboratory conditions. We have done measurements with hemi-spherical cavity resonator detuned with piezo crystals. The measurement was set up in a single plane. Laser light was directed through half-wave retarder to a polarizing beam splitter and then converted to circular polarization by lambda/4 plates. After reflection at the mirrors, the beam is recombined in a beam splitter, sent to analyser and non-polarizing beam splitter and then inspected by two detectors with mutually perpendicular polarizers. The 90 degrees phase shift between the two arms allows precise analysis of a mutual distance change of the mirrors. Because our setup was sufficiently stable, we were able to measure the piezo constant and piezo hysteresis. The final goal is to adapt the first prototype to 23 m resonator and measure the displacement in two planes.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

JB - Sensors, detecting elements, measurement and regulation

OECD FORD branch

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Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2015

Confidentiality

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

Article name in the collection

Photonics, Devices, and Systems VI

ISBN

978-1-62841-566-7

ISSN

0277-786X

e-ISSN

—

Number of pages

6

Pages from-to

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Publisher name

SPIE

Place of publication

Bellingham (stát Washington)

Event location

Praha

Event date

Apr 13, 2015

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000349404500027