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Conference on Lasers and Electro-Optics

Intrinsic noise in a Rb laser-excited optical filter

Eric C. Apel, Timothy R. Gosnell, T. M. Shay, Ramin Samadani

Published Apr 25, 1988• 0 citations
OpenAlex

Abstract

Narrow-bandwidth optical sources are readily available. However, tunable narrow-bandwidth wide field-of-view optical filters are not available. The laser-excited optical filters (LEOFs) presented here are in principle tunable narrow-bandwidth wide field-of-view optical filters. These filters can simultaneously provide high-resolution (0.001-nm), wide field-of-view (±90°), high-quantum-efficiency, and electrically tunable optical filtering. These devices are ideally suited for extracting weak narrow-bandwidth signals buried in strong nonresonant optical background radiation. Potential applications of these filters include laser communications, laser radar, detection of Raman radiation, and atomic spectroscopy.

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Laser-Excited Optical Filter: Experiments In Rb Vapor

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Narrow bandwidth optical sources are readily available; however, tunable narrow-bandwidth, wide field-of-view optical filters are not available. Laser-excited optical filters (LEOFs) are in principle, tunable narrow-bandwidth, wide field-of-view optical filters. LEOFs can simultaneously provide high resolution (0.001 nm), wide field of-view (2π), and high quantum efficiency. These devices are ideally suited for extracting weak narrow bandwidth signals buried in strong nonresonant optical background radiation. Potential applications of these filters include remote sensing, laser communications, laser radar, detection of Raman radiation, atomic spectroscopy, etc.

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Fundamental noise processes in a laser excited optical filter

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A rubidium narrow bandwidth optical filter is being investigated as a device for detecting weak narrow bandwidth radiation. In our configuration, the optical filter is actively pumped (or laser excited, i.e., LEOF). This configuration has a major inherent advantage over a passive optical filter, namely, wavelength versatility. One possible limitation to the Rb LEOF is due to an intrinsic noise source caused by the energy pooling of Rb 5p atoms which are produced by the pump laser. This process, i.e., Rb (5p) + Rb (5p) ..-->.. Rb (5d) + (Rb(5s)) ..-->.. Rb (6p), produces Rb atoms in the 6p state which subsequently emit radiation within the bandwidth of the detection channel (420-323 nm). Hence, this constitutes a noise process since photons are produced at the detector in the absence of narrow bandwidth ''signal'' radiation. Herein, we present preliminary results on kinetic studies of the energy pooling process with the ultimate goal of quantifying the process (rate constant determination) and thus assessing its implications. 4 refs., 3 figs.

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Taking advantages of ultra-narrow bandwidth and high noise rejection performance of the Faraday anomalous dispersion optical filter (FADOF), simultaneously with the coherent amplification of atomic stimulated emission, we propose a stimulated amplified Faraday anomalous dispersion optical filter (SAFADOF) at cesium 1470 nm. The SAFADOF is able to significantly amplify very weak laser signals and reject noise in order to obtain clean signals in strong background. We show that for a weak signal of 50 pW, the gain factor can be larger than 25000 (44 dB) within a bandwidth as narrow as 13 MHz. Having the ability to amplify weak signals with low background contribution, the SAFADOF finds outstanding potential applications in weak signal detections.

Scientific Reports•Apr 20, 2018•15 citations
Narrow-bandwidth optical sources are readily available. However, tunable narrow-bandwidth wide field-of-view optical filters are not available. The laser-excited optical filters (LEOFs) presented here are in principle tunable narrow-bandwidth wide field-of-view optical filters. These filters can simultaneously provide high-resolution (0.001-nm), wide field-of-view (±90°), high-quantum-efficiency, and electrically tunable optical filtering. These devices are ideally suited for extracting weak narrow-bandwidth signals buried in strong nonresonant optical background radiation. Potential applications of these filters include laser communications, laser radar, detection of Raman radiation, and atomic spectroscopy.
Narrow bandwidth optical sources are readily available; however, tunable narrow-bandwidth, wide field-of-view optical filters are not available. Laser-excited optical filters (LEOFs) are in principle, tunable narrow-bandwidth, wide field-of-view optical filters. LEOFs can simultaneously provide high resolution (0.001 nm), wide field of-view (2π), and high quantum efficiency. These devices are ideally suited for extracting weak narrow bandwidth signals buried in strong nonresonant optical background radiation. Potential applications of these filters include remote sensing, laser communications, laser radar, detection of Raman radiation, atomic spectroscopy, etc.
Narrow bandwidth optical sources are readily available. However, tunable narrow bandwidth, wide field-of-view optical filters are not available. The laser-excited optical filters (LEOF) presented here are in principle tunable narrow bandwidth, wide field-of-view optical filters. These filters can simultaneously provide high resolution (0.001 nm), wide field-of-view (2π), high quantum efficiency, and electrically tunable optical filtering. Narrow bandwidth operation of laser-pumped atomic vapor filters were first demonstrated by Gelbwachs et al1., by Marling et al.2, and recently by Chung et al.3 The first electrical tuning of these devices was demonstrated by Gelbwachs et. al.4 In addition, alkali vapor based LEOFs can operate on 130 transitions between 921 and 474 nm. LEOFs are ideally suited for extracting weak narrow bandwidth signals buried in strong nonresonant optical background radiation. Potential applications of these filters include laser radar, laser communications, detection of Raman radiation, atomic spectroscopy, etc.
Narrow-bandwidth optical sources are readily available. However, tunable narrow-bandwidth, wide field-of-view optical filters are not available. The laser-pumped atomic vapor optical filters presented here are in principle tunable narrow-bandwidth, wide field-of-view optical filters. These filters can simultaneously provide high resolution (0.001 nm), wide field-of-view (±90°), high quantum efficiency, and electrically tunable optical filtering. These devices are ideally suited for extracting weak narrow-bandwidth signals buried in strong nonresonant optical background radiation. Potential applications of these fitters include laser communications, laser radar, detection of Raman radiation, and atomic spectroscopy.
A rubidium narrow bandwidth optical filter is being investigated as a device for detecting weak narrow bandwidth radiation. In our configuration, the optical filter is actively pumped (or laser excited, i.e., LEOF). This configuration has a major inherent advantage over a passive optical filter, namely, wavelength versatility. One possible limitation to the Rb LEOF is due to an intrinsic noise source caused by the energy pooling of Rb 5p atoms which are produced by the pump laser. This process, i.e., Rb (5p) + Rb (5p) ..-->.. Rb (5d) + (Rb(5s)) ..-->.. Rb (6p), produces Rb atoms in the 6p state which subsequently emit radiation within the bandwidth of the detection channel (420-323 nm). Hence, this constitutes a noise process since photons are produced at the detector in the absence of narrow bandwidth ''signal'' radiation. Herein, we present preliminary results on kinetic studies of the energy pooling process with the ultimate goal of quantifying the process (rate constant determination) and thus assessing its implications. 4 refs., 3 figs.
Taking advantages of ultra-narrow bandwidth and high noise rejection performance of the Faraday anomalous dispersion optical filter (FADOF), simultaneously with the coherent amplification of atomic stimulated emission, we propose a stimulated amplified Faraday anomalous dispersion optical filter (SAFADOF) at cesium 1470 nm. The SAFADOF is able to significantly amplify very weak laser signals and reject noise in order to obtain clean signals in strong background. We show that for a weak signal of 50 pW, the gain factor can be larger than 25000 (44 dB) within a bandwidth as narrow as 13 MHz. Having the ability to amplify weak signals with low background contribution, the SAFADOF finds outstanding potential applications in weak signal detections.