Relationship between threshold gain and Bragg detuning in photonic-crystal surface-emitting lasers

Zong Lin Li, Shen Chieh Lin, Yu Chen Chen, Gray Lin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The device characteristics of GaSb-based mid-infrared (MIR) photonic-crystal (PC) surface-emitting lasers (SELs) were investigated with respect to depths of etched PC holes. Measurement of below-Threshold emission spectra identifies the bandgap as well as band-edge modes. The bandgap separation, which is a function of feedback coupling, increases with increasing depth. From within, the Bragg frequencies and their detuning from lasing frequencies can be determined. Moreover, with increasing depth, the threshold pumping density decreases exponentially to a saturation level, which is assigned to minimum device modal gain of certain value. The relative threshold gain is then plotted as a function of normalized frequency detuning. The gain-detuning relationship of PCSELs is similar to that of one-dimensional (1D) distributed feedback (DFB) lasers.

Original languageEnglish
Title of host publicationAOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019
EditorsArnan Mitchell, Halina Rubinsztein-Dunlop
PublisherSPIE
ISBN (Electronic)9781510631403
DOIs
StatePublished - 30 Dec 2019
EventAOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019 - Melbourne, Australia
Duration: 9 Dec 201912 Dec 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11200
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceAOS Australian Conference on Optical Fibre Technology, ACOFT 2019 and Australian Conference on Optics, Lasers, and Spectroscopy, ACOLS 2019
CountryAustralia
CityMelbourne
Period9/12/1912/12/19

Keywords

  • GaSb-based lasers
  • Mid-infrared lasers
  • photonic crystals
  • Surface-emitting lasers

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