Optical and Quantum Electronics

, Volume 28, Issue 10, pp 1239–1257

A novel tunable dual-wavelength external-cavity laser diode array and its applications

  • Cl-Ling Pan
  • Chi-Luen Wang
Opto-Electronics Invited Paper

DOI: 10.1007/BF00326197

Cite this article as:
Pan, CL. & Wang, CL. Opt Quant Electron (1996) 28: 1239. doi:10.1007/BF00326197


We review the principles and characteristics of a novel tunable external-cavity laser diode source. It can operate as either a continuous wave (CW) single-wavelength, a CW dual-wavelength, a single-wavelength mode-locked, or a tunable dual-wavelength mode-locked laser. The gain medium is a commercial laser diode array. The telescopic external cavity consists of a grazing-incidence grating, a lens and a stripe-mirror. The external cavity provides functions of wavelength selection, dispersion compensation and spatial mode control. The characteristics of the laser under CW or mode-locked operation are described. The dual-wavelength laser output exhibits beat note beyond 7 THz. The tunable multi-terahertz beat frequency is characterized by a non-collinear intensity autocorrelation technique. A dual-wavelength interferometer that uses a tunable dual-wavelength laser as the light source is demonstrated. Finally, theoretical analysis is presented, which demonstrates that the dual-wavelength output of the laser is stable if the modes at the two wavelengths correspond to different array lateral modes.

Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • Cl-Ling Pan
    • 1
  • Chi-Luen Wang
    • 1
  1. 1.Institute of Electro-Optical EngineeringNational Chiao Tung UniversityHsinchu, TaiwanPeople's Republic of China
  2. 2.Precision Instrument Development CentreHsinchu Science-Based Industrial ParkHsinchuTaiwan

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