Theoretical study of Talbot-like bands observed using a laser diode below threshold

Podoleanu, Adrian G.H. and Taplin, Stephen R. and Webb, David J. and Jackson, David A. (1998) Theoretical study of Talbot-like bands observed using a laser diode below threshold. Pure and Applied Optics, 7 (3). pp. 517-536. ISSN 0963-9659. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL 10.1088/0963-9659/7/3/013


We report on a theoretical study of an interferometric system in which half of a collimated beam from a broadband optical source is intercepted by a glass slide, the whole beam subsequently being incident on a diffraction grating and the resulting spectrum being viewed using a linear CCD array. Using Fourier theory, we derive the expression of the intensity distribution across the CCD array. This expression is then examined for non-cavity and cavity sources for different cases determined by the direction from which the slide is inserted into the beam and the source bandwidth. The theoretical model shows that the narrower the source linewidth, the higher the deviation of the Talbot bands' visibility (as it is dependent on the path imbalance) from the previously known triangular shape. When the source isa laser diode below threshold, the structure of the CCD signal spectrum is very complex. The number of components present simultaneously increases with the number of grating lines and decreases with the laser cavity length. The model also predicts the appearance of bands in situations not usually associated with Talbot bands.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Optics
Depositing User: M.A. Ziai
Date Deposited: 27 Mar 2009 04:52
Last Modified: 18 Jul 2014 09:23
Resource URI: (The current URI for this page, for reference purposes)
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