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The fast label-free detections of the extent and degree of cerebral ischemia have been the difficulties and hotspots for precise and accurate neurosurgery. We experimentally demonstrated the terahertz (THz) transmission imaging of the fresh cerebral tissues at different ischemic stages within 24 hours. With a CO2 laser pumped continuous-wave THz imaging system operating at 2.52 THz, THz imaging could...
The influence of pumping mode on the output characteristic of terahertz parametric oscillators (TPO) is studied theoretically and experimentally. A multi-transverse mode laser was used as the pump source. With the improvement of the transverse mode of the pump beam, a significant increasing of THz output power was observed. The THz output energy decreased from 172nJ to 17nJ when M2 value of pump beam...
We report an improvement of terahertz (THz) output energy via Cherenkov-type difference frequency generation by developing the dual-wavelength pump source, which is based on a singly resonant near-degenerated optical parametric oscillator. Total utilization efficiency of pump energy is considerably increased by recycling the residual fundamental wave. The highest energy of Cherenkov-type monochromatic...
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