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Simplified Generation of High-Angular-Momentum Light Beams

Inherent properties of a WGM resonator and optical fiber are exploited. NASA’s Jet Propulsion Laboratory, Pasadena, California A simplified method of generating a beam of light having a relatively high value of angular momentum (see figure) involves the use of a compact apparatus consisting mainly of a laser, a whispering-gallery-mode (WGM) resonator, and optical fibers. The method also can be used to generate a Bessel beam. (“Bessel beam” denotes a member of a class of non-diffracting beams, so named because their amplitudes are proportional to Bessel functions of the radii from their central axes. High-order Bessel beams can have high values of angular momentum.)

Posted in: Photonics, Briefs, ptb catchall, Tech Briefs, Photonics

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Complex Type-II Interband Cascade MQW Photodetectors

Multiple active subregions, each optimized for a different color, would enable multicolor operation. NASA’s Jet Propulsion Laboratory, Pasadena, California Multiple-quantum-well (MQW) photodetectors of a proposed type would contain active regions comprising multiple superlattice subregions. These devices would have complex structures: The superlattice of each subregion would be designed for enhanced absorption of photons in a desired wavelength band (typically in the infrared) and multiple subregions of different design would be cascaded for multicolor operation.

Posted in: Photonics, Briefs, ptb catchall, Tech Briefs, Photonics

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Interferometric Quantum-Nondemolition Single-Photon Detectors

These detectors would function independently of frequency. NASA’s Jet Propulsion Laboratory, Pasadena, California Two interferometric quantum-nondemolition (QND) devices have been proposed: (1) a polarization-independent device and (2) a polarization-preserving device. The prolarization-independent device works on an input state of up to two photons, whereas the polarization-preserving device works on a superposition of vacuum and single-photon states. The overall function of the device would be to probabilistically generate a unique detector output only when its input electromagnetic mode was populated by a single photon, in which case its output mode would also be populated by a single photon.

Posted in: Photonics, Briefs, ptb catchall, Tech Briefs, Photonics

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Ring-Down Spectroscopy for Characterizing a CW Raman Laser

Parameters of operation can be obtained from a single ring-down scan. NASA’s Jet Propulsion Laboratory, Pasadena, California A relatively simple technique for characterizing an all-resonant intracavity continuous- wave (CW) solid-state Raman laser involves the use of ring-down spectroscopy. As used here, “characterizing” signifies determining such parameters as threshold pump power, Raman gain, conversion efficiency, and quality factors (Q values) of the pump and Stokes cavity modes.

Posted in: Photonics, Briefs, ptb catchall, Tech Briefs, Photonics

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Product of the Month: HPL Diodes, Bars, and Stacks

Intense, Ltd. (Glasgow, UK) released Hermes™, a family of High Power Laser (HPL) products. Included are single emitters, bars, conductively and micro-channel cooled bars, and stacks. The single emitters have wavelengths of 808 nm (up to 5 W), 940 nm (up to 7 W), and 980 nm (up to 7 W). The bars are at 808 nm and 940 nm (both up to 100 W), while the conductively cooled bars are 808 nm (up to 60 W) and the micro-channel cooled bars are 808 nm (up to 100 W). The stack is 808 nm (up to 805 W). The devices operate in both continuous-wave and quasi-continuous-wave modes. The line is designed for use in industrial, medical, defense, and aerospace applications.

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Dichroic Filter

Patterned dichroic filters from Deposition Sciences, Inc. (Santa Rosa, CA) operate over a wide range of wavelengths, from near ultraviolet to infrared. Able to be applied in a variety of substrates in multiple shapes and sizes, the filters maintain stability in extreme temperatures and conditions. Additionally, they may be applied to wafer substrates up to 100 mm in diameter in materials such as glass, silicon, sapphire, and fused silica. Coatings are applied on a single substrate with dimensions down to 100 microns, an accuracy of ±1 micron, and feature placement accuracy of ±5 microns. Applications include optoelectronic and opto-mechanical devices, satellites, and aircraft.

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Laser-Scanning Probe

Laser Design (Minneapolis, MN) released the SLP-2000 3D laser-scanning probe with an extra-long-laser line (8") and standard dual CMOS receptors. The device captures 50,000 to 75,000 points per second. The probe is integrated with Surveyor Scan Control software and Surveyor 3D scanning systems, and can be used interchangeably with portable Faro CMMs, traditional CMMs, and the Surveyor DS, CS, DT, and TS-Series 3D laser-scanning systems. The probe weighs less than one pound.

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