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.
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).
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。
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Novanta is a trusted technology partner to medical and industrial OEMs (original equipment manufacturers). Additionally, Novanta holds deep proprietary expertise in photonics, vision and precision motion technologies. We engineer mission-critical core components and subsystems that deliver extreme precision and performance. This enabling our customers to improve productivity, to achieve breakthrough performance and to enhance people’s lives.
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Finally, our highly engineered component and sub-system solutions, and deep expertise in advanced photonics, vision and precision motion make us the global technology partner of choice for medical and advanced industrial OEMs.
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