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Encyclopedia > Tunable laser

Tunable lasers are used in DWDM-systems to allow wavelength (frequency) changes controlled by the operator. The original version of this article was based on FOLDOC, with permission In telecommunications wavelength division multiplexing (WDM) is a technology which multiplexes several optical carrier signals on a single optical fibre by using different wavelengths (colours) of laser light to carry different signals. ...


Dye lasers, using organic dyes as lasing medium, are frequently employed. Other types that can be tuned are the Ti-sapphire laser and some semiconductor lasers. A dye laser used at the Starfire Optical Range for LIDAR and laser guide star experiments is tuned to the sodium D line and used to excite sodium atoms in the upper atmosphere. ... Part of a Ti-sapphire oscillator. ... A packaged laser diode with penny for scale. ...

Contents


Narrowband Tunable Lasers

Usually thermally tuned DFB lasers. Maximum tuning range: 8 nm


DFB Arrays

Several DFB lasers operating at different frequencies (coarse tuning) and additionally thermally tuned (fine tuning)


Externally Cavity Lasers

VCSELs

Main article: VCSEL

Diagram of a simple VCSEL structure. ...

See also


  Results from FactBites:
 
Mike McKerns -- Research -- Wavelength Tunable Laser (1082 words)
To obtain a fluence strong enough to sufficiently characterize the NLO responses of solutions of MTXP complexes, a relatively strong laser such as an Nd:YAG must be used as the light source.
The zero-order diffraction output produced at the grating was reflected off an orthogonally mounted broadband reflective mirror, such that frequency tuning was produced by rotating the grating/mirror corner reflector about the axis perpendicular to the plane of grating dispersion, thus providing unchanged direction of propagation for the output beam.
The coupling of the tunable laser with the semiempirical model for ESA potentially provides not only an understanding of the wavelength-dependent nature of the fitted absorption cross-sections but, under careful analysis of the change in the transmission characteristics with the change in wavelength, an accurate map of the energy-level manifold of the [CH -CdTXP]Cl solution.
  More results at FactBites »


 

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