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Multipass Faraday rotators and isolators
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DOI：10.1364/OE.520396.png)
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Faraday isolators are usually limited to Faraday materials with strong Verdet constants. We present a method to reach the 45 degrees polarization rotation angle needed for optical isolators with materials exhibiting a weak Faraday effect. The Faraday effect is enhanced by passing the incident radiation multiple times through the Faraday medium while the rotation angle accumulates after each pass. Materials having excellent thermo-optical properties in the ultraviolet and mid-infrared range become available for optical isolators. Herriott-type multipass cells offer a simple and compact way to realize the desired propagation length in usual optical materials of standard sizes. A proof-of-principle experiment was carried out, demonstrating polarization rotation of a 532 nm laser beam by an angle of 45 degrees in anti-reflection-coated fused silica surrounded by a standard neodymium ring magnet.
Keyword:
TEMPERATURE-DEPENDENCE
OPTICAL-FIBERS
ROTATION
COMPACT
SPECTROSCOPY
ABSORPTION
SAPPHIRE
CRYSTAL
期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
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