Fig. 3: Temperature-dependent laser characteristics of CQDAMs and thermal stability under continuous working conditions.
From: Ultrastable low-cost colloidal quantum dot microlasers of operative temperature up to 450 K
a Normalized contour plots of the temperature-dependent lasing spectra from an individual CQDAM at excitation density above the threshold. b Temperature-dependent laser FWHM (black circle) and threshold (red square) in the range from 77 to 450 K. c The interference fringe visibility of the lasing output by using a Michelson interferometer. The coherent time is obtained by the time-dependent self-interference experiments. The dots are the experimental data, and the lines are the fitting results. The corresponding coherence times at 300, 370, and 400 K are ~5.4, 0.85, and 0.44 ps, respectively. Inset: interference image. d Continuous working ability at different temperatures. The stable intense output from an individual CQDAM can be maintained for 40 min with 2.4 × 107 lasing pulses even at 450 K
