dorsal/arxiv
View SchemaSuspension of the fiber mode-cleaner launcher and measurement of the high extinction-ratio (10^{-9}) ellipsometer for the Q & A experiment
| Authors | Hsien-Hao Mei, Sheng-Jui Chen, Wei-Tou Ni |
|---|---|
| Categories | |
| ArXiv ID | physics/0508153 |
| URL | https://arxiv.org/abs/physics/0508153 |
| DOI | 10.1088/1742-6596/32/1/035 |
| Journal | J.Phys.Conf.Ser. 32 (2006) 236-243 |
Abstract
The Q & A experiment, first proposed and started in 1994, provides a feasible way of exploring the quantum vacuum through the detection of vacuum birefringence effect generated by QED loop diagram and the detection of the polarization rotation effect generated by photon-interacting (pseudo-)scalar particles. Three main parts of the experiment are: (1) Optics System (including associated Electronic System) based on a suspended 3.5-m high finesse Fabry-Perot cavity, (2) Ellipsometer using ultra-high extinction-ratio polarizer and analyzer, and (3) Magnetic Field Modulation System for generating the birefringence and the polarization rotation effect. In 2002, the Q & A experiment achieved the Phase I sensitivity goal. During Phase II, we set (i) to improve the control system of the cavity mirrors for suppressing the relative motion noise, (ii) to enhance the birefringence signal by setting-up a 60-cm long 2.3 T transverse permanent magnet rotatable to 10 rev/s, (iii) to reduce geometrical noise by inserting a polarization-maintaining optical fiber (PM fiber) as a mode cleaner, and (iv) to use ultra-high extinction-ratio (10^{-9}) polarizer and analyzer for ellipsometry. Here we report on (iii) & (iv); specifically, we present the properties of the PM-fiber mode-cleaner, the transfer function of its suspension system, and the result of our measurement of high extinction-ratio polarizer and analyzer.
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"abstract": "The Q \u0026 A experiment, first proposed and started in 1994, provides a feasible\nway of exploring the quantum vacuum through the detection of vacuum\nbirefringence effect generated by QED loop diagram and the detection of the\npolarization rotation effect generated by photon-interacting (pseudo-)scalar\nparticles. Three main parts of the experiment are: (1) Optics System (including\nassociated Electronic System) based on a suspended 3.5-m high finesse\nFabry-Perot cavity, (2) Ellipsometer using ultra-high extinction-ratio\npolarizer and analyzer, and (3) Magnetic Field Modulation System for generating\nthe birefringence and the polarization rotation effect. In 2002, the Q \u0026 A\nexperiment achieved the Phase I sensitivity goal. During Phase II, we set (i)\nto improve the control system of the cavity mirrors for suppressing the\nrelative motion noise, (ii) to enhance the birefringence signal by setting-up a\n60-cm long 2.3 T transverse permanent magnet rotatable to 10 rev/s, (iii) to\nreduce geometrical noise by inserting a polarization-maintaining optical fiber\n(PM fiber) as a mode cleaner, and (iv) to use ultra-high extinction-ratio\n(10^{-9}) polarizer and analyzer for ellipsometry. Here we report on (iii) \u0026\n(iv); specifically, we present the properties of the PM-fiber mode-cleaner, the\ntransfer function of its suspension system, and the result of our measurement\nof high extinction-ratio polarizer and analyzer.",
"arxiv_id": "physics/0508153",
"authors": [
"Hsien-Hao Mei",
"Sheng-Jui Chen",
"Wei-Tou Ni"
],
"categories": [
"physics.ins-det"
],
"doi": "10.1088/1742-6596/32/1/035",
"journal_ref": "J.Phys.Conf.Ser. 32 (2006) 236-243",
"title": "Suspension of the fiber mode-cleaner launcher and measurement of the high extinction-ratio (10^{-9}) ellipsometer for the Q \u0026 A experiment",
"url": "https://arxiv.org/abs/physics/0508153"
},
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