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PRODUCT FOCUS SENSORS AND DETECTORS Light measurements


A round up of the latest detector technology, including photodiodes and sensors for laser power and energy readings


Andor Technology has launched a sensitive, OEM-dedicated NIR spectroscopy detector. The iVac 316 offers the latest innovation in sensor technology with high sensitivity in the NIR region, high- resolution 15µm pixels and broad spectral range. The Low Dark Current, Deep Depletion (LDC-DD) technology builds on the benefits of traditional Back Illuminated, Deep Depletion (BI-DD) sensors, but offers an order of magnitude lower dark current. Andor’s iVac 316 LDC-DD combines superb dark current performance and up to 95 per cent quantum efficiency, further incorporating fringe suppression technology for ultra-low optical etaloning. Thermo-electric cooling down to -60o


C ensures that, by


simultaneously minimising dark current and maximising NIR photon collection, the best signal-to- noise can be achieved for a wide range of applications. These approaches include Raman or photoluminescence-based benchtop systems in analytical laboratories, process control in industrial environments, and the growing and demanding area of spectrally- assisted diagnostics for clinicians in the medical field. www.andor.com


Excelitas Technologies has released the YAG-555-4AH, the newest addition to its YAG family of 1,064nm enhanced silicon PIN quadrant detectors. The new quadrant detector features greater responsivity for the 1,064nm wavelength and has a wide dynamic range with minimal (less than 1 per cent) cross-talk between quadrants. As a result, the detectors have improved signal-to-noise ratio for greater ranging distance. Also, the accuracy of the overall guidance system is increased, since the


30 ELECTRO OPTICS l JUNE 2014


Coherent has released a new type of laser power sensing detector that combines the broad wavelength sensitivity, dynamic range and laser damage resistance of a thermopile with the response speed of a semiconductor photodiode. Heat flows vertically through a film which is only microns thick in the PowerMax-Pro sensors, rather than radially to the edge of the device over a distance of several centimetres. The result is a measurement response time less than 10µs. Plus, these detectors can operate over a spectral range as broad as 300nm to 11µm, and incorporate a large 30 x 30mm active area.


entire surface of the YAG 555-4AH responds to light and there are no dead zones between quadrants. Excelitas’ latest quadrant detector features a 14mm diameter and provides defence OEMs and prime contractors with an additional option for precise beam positioning in laser spot tracking and munitions guidance. www.excelitas.com


The high response speed of


PowerMax Pro sensors is particularly advantageous in commercial applications, where it enables CW laser power and pulsed laser energy to be sampled much more frequently, resulting in increased throughput and improved process control. The PowerMax-Pro product offering includes two coatings: a broadband coated model, which operates from 300nm to 11µm, and a high dmage threshold (up to 14kW/cm²) model, which covers both 300nm to 1,100nm and 9.5µm to 11µm. www.coherent.com


Fraunhofer COMEDD will present a colour sensor featuring four organic photodiodes at this year’s Sensor and Test trade fair in Nuremberg from 3 to 5 June. Scientists at the Fraunhofer Research Institution for Organics, Materials and Electronic Devices COMEDD in Dresden are developing optical photodiodes (OPD) that rely on organic materials such as molecules, polymers or


colour pigments. These kinds of organic OPDs are extremely lightweight, cheap to produce, and can be integrated into polymer films which can then be applied to concave or curved surfaces. The choice of which material to use is determined primarily by the wavelength spectrum customers select for their applications. Organic materials are each sensitive only to a particular wavelength range. So, by choosing the right material, scientists can control and tailor the spectral sensitivity of their optical sensors. The scientists are also developing compact micro-sensors that combine organic semiconductors with silicon technology. Uses vary from tiny sensor elements for cameras or for bioanalytics to large-scale, quality control applications. In lab-on-chip applications, for instance, OPDs can detect certain DNA sequences that have been tagged with fluorescent markers. www.comedd.fraunhofer.de


Gentec-EO has launched its meterless Integra series for measuring laser power and energy. The device combines a detector and a meter in one convenient product. The small but powerful meter has a direct USB connection for plugging it into a PC. All Gentec-EO’s most popular detectors are available with the Integra option. With its miniaturised electronics integrated within the USB head, the detectors are perfectly suited to embedded


@electrooptics | www.electrooptics.com


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