, Volume 53, Issue 2, pp 307–319

An alternative approach to determine the spot-size of a multi-mode laser beam and its application to diode laser beams

  • Rakesh Kapoor
  • PK Mukhopadhyay
  • Jogy George
  • SK Sharma


An alternative approach is suggested to determine the spot-size of a multi-mode laser beam. It has been shown by simulations that the suggested approach can give the beam quality factor and characteristic radius with less than 5% error. Unlike the power content method, the proposed method is applicable to the beams even with diameter one tenth of the CCD size. The new approach has been applied to a multi-mode diode laser output and it is shown that the ABCD matrix analysis can be used for beam propagation, with the measured parameters of the laser.


Multi mode beam M2 parameter diode laser 


42.60.Jf 42.55.Px 


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  1. [1]
    Y F Chen, T S Liao, C F Kao, T M Huang, K H Lin, and S C Wang, IEEE J. Quantum Electron. 32, 2010 (1996)CrossRefADSGoogle Scholar
  2. [2]
    P A Belanger, Opt. Lett. 16, 196 (1991)ADSCrossRefGoogle Scholar
  3. [3]
    A E Siegman and Steven W Townsend, IEEE J. Quantum Electron. 29, 1212 (1996)CrossRefADSGoogle Scholar
  4. [4]
    ISO-Norm, document ISO/TC 172/SC 9 WGI (1991-02-19), Test method for width, divergence and radiation characteristic factor of laser beams (1991)Google Scholar
  5. [5]
    N Reng and B Eppich, Opt. Quantum Electron. 24, S973 (1992)Google Scholar
  6. [6]
    A E Siegman, New developments in laser resonators, SPIE 1224, 2 (1990)CrossRefADSGoogle Scholar
  7. [7]
    A E Siegman, Lasers (University Science Book, Mill Valley, CA, 1986)Google Scholar
  8. [8]
    W H Carter, Appl. Opt. 19, 1027 (1980)ADSGoogle Scholar
  9. [9]
    R L Phillips and L C Andrews, Appl. Opt. 22, 643 (1983)ADSGoogle Scholar

Copyright information

© Indian Academy of Sciences 1999

Authors and Affiliations

  • Rakesh Kapoor
    • 1
  • PK Mukhopadhyay
    • 1
  • Jogy George
    • 1
  • SK Sharma
    • 1
  1. 1.Solid State Laser LaboratoryCenter for Advanced TechnologyIndoreIndia

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