OPTICAL ISOLATOR
To provide a compact optical isolator having transparency in violet and blue wavelengths of 400 to 470 nm.SOLUTION: The present invention provides a 400 to 470 nm wavelength-band optical isolator characterized by being provided with a Faraday rotor having a Verdet constant at least equal to 750 Rad/...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | To provide a compact optical isolator having transparency in violet and blue wavelengths of 400 to 470 nm.SOLUTION: The present invention provides a 400 to 470 nm wavelength-band optical isolator characterized by being provided with a Faraday rotor having a Verdet constant at least equal to 750 Rad/T m at wavelengths of 400 nm to 470 nm, and a hollow magnet arranged at the outer circumference of the Faraday rotor, wherein a magnetic flux density B (T) applied to the Faraday rotor lies within the range of formula (1), and an optical path length L (cm) in which the Faraday rotor is arranged lies within the range of formula (2): B≤0.40 (1) and 0.26≤L≤0.50 (2).SELECTED DRAWING: Figure 1
【課題】紫及び青色波長４００～４７０ｎｍにおいて透明で小型化した光アイソレータを提供すること。【解決手段】波長４００ｎｍ～４７０ｎｍにおけるベルデ定数が７５０Ｒａｄ／Ｔ・ｍ以上のファラディ回転子と、前記ファラディ回転子の外周に配置される中空マグネットとを具備し、前記ファラディ回転子に印加される磁束密度Ｂ（Ｔ）が下記式（１）の範囲内にあり、前記ファラディ回転子が配置される光路長Ｌ（ｃｍ）が下記式（２）の範囲内にあることを特徴とする４００～４７０ｎｍ波長帯域用光アイソレータ。Ｂ≦０．４０ （１）０．２６≦Ｌ≦０．５０ （２）【選択図】図１ |
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