Figure 2 | Scientific Reports

Figure 2

From: Real-time intravascular photoacoustic-ultrasound imaging of lipid-laden plaque in human coronary artery at 16 frames per second

Figure 2

1.7 µm 2 kHz MOPA-pumped OPO for high-speed optical excitation. (a) Schematic of MOPA-pumped OPO. Dashed boxes labeled by I, II, and III highlight the master oscillator, optical power amplifier, and OPO, respectively. LD, laser diode; CL, coupling lens; M1 and M5, fold mirror; M2, M10, and M11, flat mirror; M3, M4, M6, M7, M8, M12, and M13, reflective mirror; M9, dichroic mirror; P, polarizer; BBO, beta barium borate Pockels cell; OC, output coupler; L, lens; KTP, potassium titanyl phosphate; W, output window. (b) Output wavelength of the laser (black curve), 1725 nm, matching the maximum peak in photoacoustic spectrum of lipids (blue curve). (c) Output power with control current. Other performance parameters can be found in Supplementary Fig. S1.

Back to article page