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FBH to Exhibit dual-wavelength diode lasers

Laser sources emit light from only one chip at two different stabilised wavelengths

The Ferdinand-Braun-Institut (FBH), known for its high brightness diode lasers and UV LEDs, is exhibiting some novel dual-wavelength diode lasers at the international trade fair Laser World of Photonics in Munich from June 22 - 25, 2015.

The dual-wavelength diode lasers are suitable for use in miniaturised, portable laser measurement systems for Raman spectroscopy applications. The laser sources alternatingly emit light from only one chip at two different stabilised wavelengths, which are defined by gratings implemented into the semiconductor chip.

Wavelength selection is realised by separately addressable sections within the laser. The innovative diode laser chip is 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 tiny monolithic light sources on chip level, a compact SERDS measurement head that is only as small as a laser pointer was realised for the first time, says the company. This device is the basis for a unique miniaturised 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 according to FBH.

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