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Spektral durchstimmbare DFB Laser für Anwendungen
in der Gasmessung

Tunable DFB lasers are a key feature in a wide variety of different
applications ranging from process control to medical diagnostics

Dr. Lars Hildebrandt, Vertrieb, nanoplus GmbH, Gerbrunn
VDI-Fachkonferenz 16. - 17. Februar 2011 in Frankfurt am Main



DFB Laser versus FP Laserdiodes

DFB : Distributed Feedback Laser
FP LD : Fabry-Pérot
FP LD in an external cavity yield good tuning ranges as well as monomode spectra. Such systems are available for high resolution spectroscopy at all wavelengths between 400 nm and 11 μm, however, they incorporate mechanical parts which make them hardly usable for industrial environments, for field measurements or in production sites.


DFB Laser

This problem is overcome by distributed feedback (DFB) lasers. The key element for monomode emission and the tuning characteristics is the DFB-grating. Through a special technology, based on lateral metal Bragg gratings incorporated in the laser
structure, it is nowadays possible to fabricate monomode emitting semiconductor lasers on any III/V-based material, leading to a broad accessible wavelength range from 760 nm up to 3 μm.
In this part of the spectrum many industrial and environmental gas species exhibit strong absorption features.

NIR DFB laser diodes and MIR lasers in various packing options

Process control
Process control has evolved as one of the most important fields of application for LD based gas sensing.

One interesting sub-category thereof is combustion control.
By monitoring the concentrations of gases generated during combustion processes, such as CO, CO2, O2, NH3, NOx and SO4, precise information about the conditions inside the combustion chamber can be obtained.
This information allows for a very efficient adjustment of the process conditions resulting in less pollutant emission and higher process efficiency.


Other application areas  



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