Cross, G. H. and Strachan, E. E. (2002) 'Diode laser wavelength tracking using an integrated dual slab waveguide interferometer.', IEEE photonics technology letters., 14 (7). pp. 950-952.
The problem of tracking small changes in the output wavelength of laser diodes is addressed using a dual slab waveguide interferometer fabricated from silicon oxynitride. Waveguide mode dispersion differences between the waveguide modes provide a mechanism for identifying input wavelength shifts that are measured as shifts in the output far-field diffraction image. At visible wavelengths the device can transduce input wavelength changes into phase responses with a sensitivity of +0.9 rad/nm. The lower threshold limit of detection for laser output frequency shifts, is 2.2 GHz or 6 pm at a center wavelength of 635 run. The TE and TM sensitivities to wavelength are approximately equivalent in the device described.
|Additional Information:||This idea came out of previous work on the interferometer I devised and published on in 1999. The co-author is a project student undergraduate who undertook the experimental work.|
|Keywords:||Dispersion, Interferometer, Optical waveguides, Wavelength lockers.|
|Full text:||PDF - Published Version (163Kb)|
|Publisher Web site:||http://dx.doi.org/10.1109/LPT.2002.1012395|
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|Record Created:||28 May 2008|
|Last Modified:||09 Aug 2011 11:59|
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