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We demonstrate an optically pumped GaSb-based mid-Infrared photonic crystal surface emitting laser (PCSEL) at 2.3μm with line width of 0.3nm. The PCSEL was operated with temperature up to 350K, showing a shift rate of 0.21 nm/K.
The high contrast grating (HCG) mirror has been illustrated and characterized. The investigated parameters including grating periods and filling factors were calculated by finite-difference time-domain method. The two-dimension HCG was fabricated by electron-beam lithography and inductively coupled plasma process. The reflectivity of the fabricated HCG mirror was measured, resulting in around 200...
A duty cycle varied and a figure type period segmented waveguide Y-branch are proposed. Both mode and phase mismatch caused by the branches are compensated to increase the transmission ratio at large angles.
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