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Dual-Band Photodetector

GPD Optoelectronics Corp. (Salem, NH) has announced the availability of made-toorder Dual-Band photodetectors. Two discrete photodiodes are mounted in a stack such that the incoming light is sensed by both diodes. The design can be optimized for detection of light from the visible to mid-IR.

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Portable Spectrometer

Saelig Company, Inc. (Fairport, NY) has introduced the GL SPECTIS 5.0 Touch - a portable instrument for obtaining light measurement data ranging from NIR to UV with laboratory accuracy. Unique features of the GL SPECTIS 5.0 Touch include: laboratory accuracy, extended spectral range from 200 to 1050nm, very high resolution (0.5nm), an OSR system for stray light reduction, and compatibility with a wide range of available integrating spheres and probes for measuring almost any light source from 1 - 200,000lux (Illuminant A).

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Photothermal Excitation For Atomic Force Microscopy

Asylum Research (Santa Barbara, CA), an Oxford Instruments company, has announced blueDrive photothermal excitation, an option available exclusively for Asylum’s Cypher™ Atomic Force Microscopes (AFMs). blueDrive makes tapping mode imaging simple, stable, and accurate. blueDrive replaces the conventional piezoacoustic excitation mechanism, instead using a blue laser to directly excite the AFM cantilever photothermally. This results in an ideal cantilever drive response in both air and liquids, which provides significant performance and ease of use benefits for tapping mode imaging.

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DOP Meter

Using a patented maximum & minimum search technique, the DOP- 201 from General Photonics (Chino, CA) measures and displays the Degree of Polarization (DOP) of a light source in real time with high accuracy and wide dynamic range. While polarimeter-based systems are expensive and can be inaccurate for low-DOP sources, and polarization scrambler- based instruments are less accurate for high DOP sources, the DOP-201 accurately measures both low and high DOP. It is ideal for characterizing the performances of depolarizers and depolarized light sources, such as ASE and SLED sources and the pumps for Raman amplifiers.

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120mW Laser Diode

Oclaro’s (Denville, NJ) HL63142DG high power red laser diode offers an inbuilt monitor photodiode at a lasing wavelength of 637nm. It is a unique design which enables system designers to control optical power output by monitoring the photodiode current and adjusting power variants and temperature for precise control and constant performance.

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Laser-Induced Damage to Large Core Optical Fiber by High Peak Power Laser

In this paper we present a study of laser damage to large core multimode glass optical fibers by high peak laser power of up to 175 kW. Fibers samples prepared with polymer coatings having different refractive indices were tested in a two point bend tester while transmitting laser light. The peak power used in the experiment clearly differentiated the performance among the samples. A polymer coating having lower refractive index significantly improves the fiber resistance to bending while transmitting laser. This observation provides important insight into the damage mechanism for this particular failure mode.

Posted in: Photonics, White Papers

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Designing Ring Projections for Hermetic Sealing

Product Engineer at Miyachi Unitek, Mark Sunico offers suggestions for developing ideal ring projection designs for hermetic sealing. The whitepaper covers the whole process; from basic concepts to choosing the right weld head controller, head, power supply, and schedule -- all to ensure a reliable final product.

Posted in: Photonics, White Papers

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