第二級光学ブロッキングファブリ・ペローフィルター
Zeyang Li1, Abhishek V Karve1, Xin Wei1
1Department of Applied Physics, Stanford University, Stanford, California 94305, USA.
The Review of scientific instruments
|February 11, 2026
まとめ
ファブリ・ペロー共振器内の結合偏光モードを使用して、新しい光学フィルターを開発しました。この技術により、通信およびセンシングアプリケーションにおける信号処理の向上のために、より狭帯域幅のフラットトップフィルターが可能になります。
科学分野:
- * 光学; * フォトニクス; * 信号処理
背景:
- * フラットトップパスバンドフィルターは、信号処理、検出感度と電力効率の向上に不可欠です。; * 光学フィルターは通常、100 GHzを超えるパスバンド幅を持つ誘電体スタックを使用しており、狭帯域幅アプリケーションを制限します。; * ファブリ・ペロー共振器は、効率的な単一周波数伝送に適した単極共振器ですが、光学ドメインで多極フィルターを構築することは困難です。
研究 の 目的:
- * 狭いフラットトップパスバンドを持つ第二級ブロッキングタイプの光学フィルターを提案および実装すること。; * 既存の広帯域光学フィルターと、より狭い帯域幅ソリューションの必要性とのギャップを埋めること。; * 光ドメインで狭い帯域幅のフラットトップフィルターを実現する新しい方法を実証すること。
主な方法:
- * 単一の二重鏡ファブリ・ペロー共振器内に第二級ブロッキングタイプの光学フィルターを実装しました。; * フラットトップ応答を実現するために、2つの偏光モードの結合を利用しました。; * パスバンド幅、ストップバンド抑制、挿入損失を含むフィルターの性能を特徴付けました。
主要な成果:
- * 2.68(1) GHzの狭いフラットトップパスバンド幅を実証しました。; * 最大43 dBのストップバンド抑制を達成しました。; * パスバンド挿入損失は2.2(1) dBと測定され、帯域外電力抑制はずれの4乗で減少しました。
結論:
- * 提案された方法により、大幅に狭い帯域幅のフラットトップ光学フィルターを作成できます。; * このアプローチは、レーザー位相ノイズとLIDAR感度の潜在的な改善を提供する、さらに狭いフィルターに拡張可能です。; * 開発されたフィルター技術は、ラマンスペクトル分析などのアプリケーションに高品質の狭帯域フィルタリングを提供します。
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