Fig. 3: L-I-V and spectral characterizations for THz PEPC QCLs.
From: High brightness terahertz quantum cascade laser with near-diffraction-limited Gaussian beam
a L-I-V characterization of a THz PEPC QCL with d = 0.3a and L = 1.6 mm at different temperatures under a pulsed condition with a repetition rate of 10 kHz and a wide pulse of 4-μs duration. The I–V curve was taken at 13 K. b Spectrum of THz PEPC QCL (d = 0.3a) near the roll-over current at 13 K, and the measured SMSR is over 20 dB. c Measured normalized lasing spectra of THz PEPC QCLs (d = 0.3a) with different lattice constants (a = 22.20, 21.85, and 21.50 μm) at different bias conditions at 13 K as functions of frequency
