Applied Sciences (Jul 2018)

Spectral Linewidth vs. Front Facet Reflectivity of 780 nm DFB Diode Lasers at High Optical Output Power

  • Thanh-Phuong Nguyen,
  • Hans Wenzel,
  • Olaf Brox,
  • Frank Bugge,
  • Peter Ressel,
  • Max Schiemangk,
  • Andreas Wicht,
  • Tran Quoc Tien,
  • Günther Tränkle

DOI
https://doi.org/10.3390/app8071104
Journal volume & issue
Vol. 8, no. 7
p. 1104

Abstract

Read online

The influence of the front facet reflectivity on the spectral linewidth of high power DFB (distributed feedback) diode lasers emitting at 780 nm has been investigated theoretically and experimentally. Characterization of lasers at various front facet reflections showed substantial reduction of the linewidth. This behavior is in reasonable agreement with simulation results. A minimum linewidth of 8 kHz was achieved at an output power of 85 mW with the laser featuring a front facet reflectivity of 30%. The device with a front facet reflectivity of 5% reached the same linewidth value at an output power of 290 mW.

Keywords