Figure 4
From: Far-field characterization of the thermal dynamics in lasing microspheres
(a) Time-resolved 2D color-map of the wavelength red-shift of lasing mode 1 (and part of mode 2) under an incident photon flux of 5.5 × 1023 ph/cm2 s. Colors refer to detected PL intensity, being the legend the same as in Fig. 1b, y-axis scale represents the collection wavelength and the x-axis scale is the excitation time, its origin taken at tini. (b) Temporal behavior of the laser spectral position of mode 1 for low (2.5 × 1023 ph/cm2 s) and high (5.5 × 1023 ph/cm2 s) incident photon fluxes, respectively. (c) Normalized wavelength shift for low and high photon fluxes together with a fit using Eq. 3. (d) Inverted normalized wavelength shift for low and high photon fluxes represented in logarithmic scale.
