Surface emission lasing in pulse operation was realized with a quantum cascade laser using a two-dimensional photonic crystal at a wavelength of about 4 µm. The quantum well of the light-emitting layer was a strain-compensated system, and crystal growth was achieved while maintaining the strain balance. PC-QCLs lasing were realized on the single-mode vertical-emission at 77K under pulse operation. The threshold current density is 760 A/cm2 . The far-field radiation pattern showed a very small divergence angle of less than 1°. In addition, we observed the polarization dependence of the far-field profile, and analyzed for operating characteristics
A quantum cascade laser-based gas analyzers with table-top size are developed for the acetone and isotope of carbon dioxide. The precision of 0.1 ppm and 0.3 ‰ in delta notation are achieved respectively.
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