- 期刊
The Study of Lasing Behavior in GaN-based 2D Photonic Crystal Surface Emitting Lasers
氮化鎵二維光子晶體面射型雷射之雷射行為研究
並列摘要
We have investigated the lasing characteristics of GaN-based two-dimensional photonic crystal surface emitting lasers (PCSELs) with different PC lattice constants by using angled resolved spectroscopy. Due to the Bragg diffraction theory, normalized frequency of lasing wavelength of PCSELs can be exactly matched with three distinct band-edge frequencies (Γ1, K2, M3) in the photonic band diagram. The three band-edge frequencies (Γ1, K2, and M3) have different emission angles corresponding to the normal direction of the sample (0°, 29°, 59.5°). Furthermore, the divergence angles of the emission beams at three band-edge frequencies (Γ1, K2, M3) are about (1.2°, 2.5°, 2.2°), respectively.