Tropes

www.sciencedaily.com 2015 08995.txt.txt

#Comprehensive know-how and the full value chain, from technology development to complete systems Arraythe FBH develops the LED TECHNOLOGY in the UV-B and UV-C spectral range from the chip to the final radiation module. Applications are wide-ranging and include medical diagnostics and fluorescence spectroscopy as well as UV curing and disinfection. A further application field is plant lighting, for which the FBH has developed and manufactured a module enabling irradiation with UV-B light of a specific wavelength. In this particular case, LEDS emitting at a wavelength around 310 nm are used to stimulate health-promoting secondary metabolites in plants. The optical power can be adjusted flexibly between 0 and 100%.%The novel concept was tested successfully in experiments at the Institute of Vegetable and Ornamental Crops (IGZ. An exhibition module is available at the trade fair booth. Arrayat the fair, the FBH exhibits novel dual-wavelength diode lasers that are suitable for use in miniaturized, portable laser measurement systems for Raman spectroscopy applications. The laser sources alternatingly emit light from only one chip at two different stabilized wavelengths, which are defined by gratings implemented into the semiconductor chip. Wavelength selection is realized by separately addressable sections within the laser. The innovative diode laser chip is ideally applicable for SERDS (Shifted Excitation Raman Difference Spectroscopy), enabling to measure Raman spectra under real-world conditions even in highly fluorescent environments and when exposed to daylight. Thus it is possible to separate Raman signals from background interferences. Moreover, SERDS improves the detection limit by one order of magnitude compared to standard Raman spectroscopy. With these FBH tiny monolithic light sources on chip level, a compact SERDS measurement head that is only as small as a laser pointer was realized for the first time. This device is the basis for a unique miniaturized and versatile SERDS spectroscopy system, enabling in-situ measurements in various security and health relevant fields including biology, medicine, food control, and pharmacy. Applications in absorption spectroscopy and for generating terahertz radiation are also conceivable. Arrayfiber-coupled demonstrators newly developed at FBH for industrial use aim at integrating laser radiation with high spectral brightness into various systems thus enabling easier usage. Now, efficient and compact laser sources are at hand emitting in the near-infrared on multi-watt level (CW operation) with a narrow-band spectrum and a stigmatic, nearly Gaussian laser beam which is independent of the optical power level. Such sources are demanded highly for the pumping of solid-state lasers and frequency doubling. On a footprint of less than 10 cm2, the micro module integrates a 1064 nm distributed Bragg reflector (DBR) tapered laser, a micro-optical assembly designed to maintain brightness and mounted with sub-micrometer precision and temperature-stabilizing components. The module is equipped also with a single-mode fiber output with standard FC/APC connector. Arraythe institute develops highly brilliant diode lasers in a great variety of designs and packages, covering the wavelength range from 630 nm to 1180 nm. Single emitters with a stripe width of 90 m, for example, reach peak brilliance results with 3. 5 W/mm-mrad. The same applies to even smaller stripes delivering 4 W/mm-mrad from a 30 m aperture. For rapid prototyping applications the FBH has developed DBR ridge waveguide (RW) lasers with 24 individually addressable emitters featuring a wavelength spacing>0. 3 nm and a spectral width<1 pm. Further activities at the institute aim at constantly improving efficiency, reliability, and output power. FBH bars around 940 nm at temperatures of-70°C (203 K for example, delivered a worldwide best result of 2 kw peak power per bar at a pulse width of 200 s. To date, such powers could only be achieved by combining the optical beams from at least four single bars l

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