Figure 1
Schematic depiction of the CWLD system for high-speed ALEX and FWM optoacoustic microscopy. (a) The system equips three CWLDs, each of which was controlled by a custom-designed electrical circuit driver and received ultrashort trigger signals provided by arbitrary function generators. AL, achromatic doublet lens; AMP, low noise amplifier; AWG, arbitrary waveform function generator; CWLD, continuous wave laser diode; DAQ, data acquisition card; GM, galvanometric mirror scanner; GMC, GM controller; IM, inverted microscope; L, plano-convex lens; M, dielectric mirror; OL, microscope objective lens; PH, pinhole; S, high-precision motorized stage; UT, ultrasound transducer. (b) Principle of using the CWLD for alternating laser excitation (ALEX) or Frequency-Wavelength Multiplexed (FWM) optoacoustic microscopy. (Driver inset adapted from16).
