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Beta factor in a random laser.

Gijs van Soest1, Ad Lagendijk

  • 1Van der Waals-Zeeman Instituut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 15, 2002
PubMed
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We defined the beta factor, the fraction of spontaneous emission seeding laser action, for random lasers. Our findings show beta is approximately 0.1, based on spectral properties and gain-loss competition.

Area of Science:

  • Laser physics
  • Photonics
  • Quantum optics

Background:

  • The beta factor quantifies the contribution of spontaneous emission to laser output.
  • Understanding spontaneous emission is crucial for laser design and performance.
  • Random lasers offer unique properties compared to traditional cavity lasers.

Purpose of the Study:

  • To develop a precise definition for the beta factor in random lasers.
  • To investigate the spectral properties influencing the beta factor in random lasers.
  • To compare the beta factor of random lasers with that of conventional cavity lasers.

Main Methods:

  • Defining the beta factor based on spectral characteristics of spontaneous and laser emission.
  • Analyzing the competition between wavelength-dependent gain and loss mechanisms.

Related Experiment Videos

  • Comparing theoretical concepts of beta factor across different laser types.

    • Main Results:

    • A new definition for the beta factor in random lasers was established.
    • The beta factor for random lasers was found to be approximately 0.1.
    • Spectral properties of emission were identified as key determinants of the beta factor.

    Conclusions:

    • The beta factor in random lasers is primarily governed by spectral properties.
    • The derived beta factor of ~0.1 provides a quantitative measure for random laser seeding.
    • Similarities and differences in beta factor between random and cavity lasers were elucidated.