Photonics

Planetary Polarization Nephelometer

Instrument provides more detailed information on aerosols encountered in a planetary environment. Aerosols in planetary atmospheres have a significant impact on the energy balance of the planets, yet are often poorly characterized. An in situ instrument was developed that would provide more diagnostic information on the nature of aerosols it encountered if deployed on a planetary descent probe. Previous probe instruments only measured intensity phase functions, but much particle ambiguity remains with only this information. Adding the polarization phase function greatly reduces particle characteristic ambiguities, but also adds more challenges in designing a measurement approach. Laboratory instrumentation to measure intensity and polarization phase functions have existed since the early 1970s, but these instruments employed quarter-wave plates and Pockels cells to modulate the illuminating beam and the scattered light to isolate the intensity and polarization phase functions. Both of these components are unstable except under tightly controlled thermal conditions. This solution avoids the use of thermally sensitive components such as quarter- wave plates or Pockels cells, and avoids requiring the detectors to be placed around the sensing volume.

Posted in: Physical Sciences, Photonics, Briefs, TSP

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GaSb-Based Diode Lasers for Remote Detection of Carbon Dioxide

Lidar systems measure carbon dioxide to understand better the impact of the carbon cycle on global warming and climate change. Monolithic ridge-waveguide GaSbbased diode lasers were fabricated with a second-order, laterally etched Bragg grating to generate single-mode emission from InGaAsSb/AlGaAsSb multiquantum- well structures. In this design, the monolithic Type-I GaSb-based diode lasers use grating structures that exhibit low internal loss. The frequency-stable diode lasers meet the needs of high power (>50 mW) and narrow linewidth (≈100 kHz). These devices are strong candidates for replacement of the solidstate light sources. Furthermore, this design is not limited to this wavelength. By optimizing the quantum well, and the optical design, this innovation can adapt to any wavelength within the 2-to-3-μm spectral window with similar performance.

Posted in: Photonics, Briefs

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Optical Tunable-Based Transmitter for Multiple High-Frequency Bands

Applications include satellite communications, optical communications networks, and RF antenna applications. The purpose of this innovation is to be able to deliver, individually or simultaneously, multiple microwave high-frequency bands including, but not limited to, L (1.5 GHz), C (7 GHz), X (8.4 GHz), Ku (14.5 GHz), Ka (32 GHz), and Q (38 GHz) frequencies at high data rates and with minimal hardware, particularly for use in satellite-to-satellite communications applications. Additionally, this innovation would be a satellite-based transmitter with a significant reduction in weight, mass, and power when compared to current, conventional technologies.

Posted in: Physical Sciences, Photonics, Briefs

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A High-Repetition-Rate Seeded Optical Fiber Amplifier (SOFiA) for the LIST Mission and Next-Generation Satellite Laser Ranging

A document describes a fiber/solid-state hybrid seeded regenerative amplifier capable of achieving high output energy with tunable pulse widths for satellite laser ranging (SLR) applications. The diode-pumped solid-state (DPSS) regenerative amplifier cavity utilizes a pair of Nd:YAG zigzag slabs oriented orthogonally to one another in order to circularize thermal lensing effects and simplify optical correction schemes. The short-pulsed seed laser is a fiber-coupled 1,064-nm narrow-band (<0.02 nm) diode laser that is intensity modulated by a fiber Mach-Zehnder electro-optic modulator, enabling continuously tunable seed pulse widths in the 0.2-to-2.0-ns range.

Posted in: Photonics, Briefs

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Motorized Zoom Lens

Resolve Optics (Chesham, Bucks, UK) has developed a variant of its Model 207 miniature motorised zoom lens, enabling a manufacturer of remotely operated vehicles (ROV’s) to help improve the deep sea welding capability of their system.

Posted in: Products, Photonics

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Galvanometer-Based Optical Scanner

ScannerMAX (Orlando, FL) recently announced the release of the all new Compact- 506 model optical scanner. The Compact-506 is built upon ScannerMAX’s patented VRAD actuator platform and features a very strong rotor construction and 6mm bearings, allowing it to move small mirrors as well as very large mirrors up to 1-inch in diameter.

Posted in: Products, Photonics

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Handheld Raman Spectrometer

Ocean Optics (Dunedin, FL) has released the IDRaman mini handheld Raman spectrometer, a small, powerful instrument for sample authentication and counterfeit detection, identification and verification. The palm-sized IDRaman delivers fast, accurate Raman analyses ranging from chemical and explosive agent detection in the field to quality assurance and quality control sampling routines in the laboratory.

Posted in: Products, Photonics

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