Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

Focusing of diode laser beams: a partially coherent Lorentz model

[+] Author Affiliations
Jiong Yang

Huazhong Univ. of Science and Technology (China) and China Aerodynamics Research and Development Ctr. (China)

Tingting Chen, Guilin Ding

Jiangsu Univ. (China)

Xiao Yuan

Huazhong Univ. of Science and Technology (China)

Proc. SPIE 6824, Semiconductor Lasers and Applications III, 68240A (January 07, 2008); doi:10.1117/12.757962
Text Size: A A A
From Conference Volume 6824

  • Semiconductor Lasers and Applications III
  • Lianghui Chen; Hiroyuki Suzuki; Paul T. Rudy; Ninghua Zhu
  • Beijing, China | November 11, 2007

abstract

Diode lasers develop very fast and are widely used in various optical equipment. Diode laser sources produce fields that show fundamental variations with respect to the canonical Gaussian beam. A partially coherent Lorentz model is employed to describe the far field of a single mode diode laser beam. This paper is concerned with laser junctions significantly narrower than the wavelength. Two lenses system are placed in front of the laser diode, so that the diverging beam is transformed into a converging beam. The across spectral density function in the plane perpendicular to the diode junction is considered in detail, and subsequently employed to predict the light intensity at various beam cross sections near the focus by using the generalized Huygens diffraction integral. The intensity profile at a focused spot produced by a partially coherent Lorentz beam is investigated and compared with that of Gaussian Schell-model beam. It is shown that it has a simple form but fairly describes the optical field in the focal region. The theoretical results are well fit to the practical results in this model and the variations between theory and the experiments are quite less than that of in Gaussian beams. Since Gaussian beams have a minimum uncertainty field, i.e. it possesses the minimum achievable angular spreading once the spatial extension is fixed. Since diode lasers produce highly diverging fields, a Gaussian description for the transverse fields fails. In this case, our results show that partially coherent Lorentz model is a better approximation, and the numerical simulation and discussions are given in detail.

© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Jiong Yang ; Tingting Chen ; Guilin Ding and Xiao Yuan
"Focusing of diode laser beams: a partially coherent Lorentz model", Proc. SPIE 6824, Semiconductor Lasers and Applications III, 68240A (January 07, 2008); doi:10.1117/12.757962; http://dx.doi.org/10.1117/12.757962


Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.