Sensing of formaldehyde using a distributed feedback interband cascade laser emitting around 3493 nm

Abstract

We have demonstrated sensing of formaldehyde (H2CO) using a room-temperature distributed feedback interband cascade laser (ICL) emitting around 3493 nm. The ICL has been characterized and proved to be very suitable for tunable laser spectroscopy (TLS). The H2CO TLS spectra were recorded in direct absorption mode and showed excellent agreement with the Pacific Northwest National Laboratory database. The measurements reported here were taken from a series of measurements of a mixture of H2CO in air obtained by vaporizing a solution also containing methanol and formic acid. We obtained a resolution limit better than 1  ppm×m assuming a relative absorption of 10−3.

 

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Detection of propane using tunable diode laser spectroscopy at 3.37 μm

Abstract

We report Tunable Diode Laser Spectroscopy measurements of propane using a recently developed 3.37 μm GaInAsSb/AlGaInAsSb DFB laser. We have demonstrated that Wavelength Modulation Spectroscopy can be utilized to enhance a sharp feature in the broader propane spectrum around 3370.4 nm. A minimum detectable concentration of 30 ppb×m was obtained at a response time of 0.5 s. This corresponded to a minimum detectable absorption of 8 × 10−5 which is why an improvement of the sensitivity by an order of magnitude is possible using this laser and a more optimized optical setup.

 

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Inhibition of TTR Aggregation-Induced Cell Death – A New Role for Serum Amyloid P Component

Serum amyloid P component (SAP) is a glycoprotein that is universally found associated with different types of amyloid deposits. It has been suggested that it stabilizes amyloid fibrils and therefore protects them from proteolytic degradation (...)

 

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