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

Zong-Lin Li; Shen-Chieh Lin; Yu-Chen Chen; Gray Lin

doi:10.1117/12.2539876

30 December 2019 Relationship between threshold gain and Bragg detuning in photonic-crystal surface-emitting lasers

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

Proceedings Volume 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019; 112002U (2019) https://doi.org/10.1117/12.2539876
Event: ANZCOP, 2019, Melbourne, Australia

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.

Citation Download Citation

Zong-Lin Li, Shen-Chieh Lin, Yu-Chen Chen, and Gray Lin "Relationship between threshold gain and Bragg detuning in photonic-crystal surface-emitting lasers", Proc. SPIE 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019, 112002U (30 December 2019); https://doi.org/10.1117/12.2539876

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