Applied Physics B

, Volume 110, Issue 4, pp 483–489 | Cite as

On the coherence measurement of a narrow bandwidth dye laser

  • Nageshwar Singh
  • H. S. Vora


In this paper, we report a new technique for spatial and temporal coherence measurement of narrow bandwidth sources. In particular, coherence measurement of a narrow bandwidth dye laser using Young’s double slit method and the Fabry–Perot interferometer has been carried out. In the spatial coherence measurement, a central fringe visibility of 0.85 was observed, and from this measurement, the dye gain medium source size was estimated. The variation in the visibility with slit separation (0.1–3.0 mm) for different source sizes (0.1–0.2 mm) was also analyzed. The temporal coherence length of the tunable dye laser was measured to be 10 and 60 cm for multimode and single-mode operations, respectively. The technique, in general, can also be used for spatial and temporal measurement of broadband spectrum source.


Second Harmonic Generation Coherence Length Wave Train Spatial Coherence Source Size 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors wish to acknowledge Anand Moorti, LPD, RRCAT, for his valuable suggestions on the manuscript, and Tapas Ganguli, ISUD, RRCAT, for manuscript correction. The authors also thank S.B. Roy, for his continuous support and freedom for the work.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Magnetic and Superconducting Materials Section, Materials and Advanced Accelerator Sciences DivisionRaja Ramanna Centre for Advanced TechnologyIndoreIndia
  2. 2.Laser Electronics Support DivisionRaja Ramanna Centre for Advanced TechnologyIndoreIndia

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