Fig. 5: Mid-IR stimulated Brillouin lasing (SBL).
From: A mid-infrared Brillouin laser using ultra-high-Q on-chip resonators
a Intensity profile of the acoustic and optical eigenmodes responsible for the stimulated Brillouin scattering (SBS) signal generated at 3.3 μm wavelength. Only the left and right halves of each mode are shown, as both modes are bilaterally symmetric. b Optical power spectrum showing SBL operation up to the 8th order, measured at the transmission port using an optical spectrum analyzer. c Measured and calculated power dynamics curve of the 2nd and 4th Stokes wave (S2, S4). The x and y axes of the calculated curves (solid lines) were both multiplied by a scaling factor of β = 1.43 to fit the measured values. The 1st Stokes wave threshold power of 91.9 μW was extracted from the fit. d Clamped power of the S2 plotted as a function of the pump wavelength, measured to calculate the Brillouin gain bandwidth.
