超高速レーザー・ノイズ測定
One of Laser Quantum’s goals has always been to create lasers with the lowest possible noise. Intracavity frequency-doubled lasers have an inherent noise of about 3% RMS. Several techniques have been developed over the years to reduce this noise, known as the “Green Problem”. At Laser Quantum we have worked for many years to develop cavity innovations and electronic solutions to progressively reduce the noise level to below 0.02% RMS (Figure 1). Additionally, our techniques are applied to all of our visible lasers, and many have been patented.
ノイズ検出方法には3つの部分があります。
1. 検出
2. 高速分析
3. 長期的なコンピューター分析
検出
Our detectors are specially made to measure 100% of the laser’s power, with no ND filters or pick off wedges between the laser and our detectors. ND filters placed in the laser beam path can lead to unwanted interference effects. This can then result in spurious noise contributions. To attenuate the laser power, we use a specifically designed ceramic plate of a thickness suitable for the measured power that diffuses the laser beam. This reduces its power as well as removes the need for an ND filter with parallel optical surfaces (Figure 2).
当社のレーザーの用途の1つは、Ti：サファイア・ポンピングです。 Ti：サファイア結晶にはノイズ伝達関数があります。レーザー・ノイズ
伝達関数の周波数範囲を超える周波数で発生することは、Ti：サファイア・レーザー・ビームの出力には見られません。 Ti：サファイアの場合、これは約800 kHzであるため（図3）、
ポンプ・ソース振幅ノイズを最小限に抑えこの値を下回ることが不可欠です。 前面のセラミック・プレートの後ろには、6 MHzの帯域幅を持つ光検出器（図4）があります。これは、Ti：サファイア・ポンピングなどのアプリケーションには十分すぎるほどです。 次に、フォト・ダイオード信号が検出器でローカルに増幅され、サンプルが0.02秒ごとに高速収集ボードに送信されます。
超高速レーザーノイズに関するホワイトペーパーここから全文を読む。
ノヴァンタについて
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