The photodetectors generally works as the significant unit in intelligent optoelectronic systems, converting optical signal into electrical signal. The photomultiplication (PM) type polymer photodetectors (PPDs) were successfully demonstrated based on sandwich structure of ITO/PEDOT:PSS/PBDB-T:polymer acceptor (mass ratio, 100:3)/Al. The performance of PM type PPDs were enhanced by solvent additive 1-chloronaphthalene (CN). The EQE value of PM type PPDs with CN under -15 volts bias approaches 860% and 600%, and is better than EQE values of 300% and 240% in PM type PPDs without CN under 350 nm and 670 nm light illumination, respectively, which confirms the effectiveness of solvent additives CN on improving the performance of PM type PPDs. The PM phenomenon can be ascribed to the hole tunneling injection assisted by interfacial band bending. This paper provides new insight into realizing excellent performance PM type PPDs.
Coherent Doppler wind lidar has found widespread applications in aerospace, aviation, space-based remote sensing,
atmospheric observation, and so on. In this paper, a china-made coherent Doppler wind Lidar prototype using all fiber optical components has been described and recent examples of wind measurement capability are provided.
Owing to the notable advantages over range, resolution and accuracy, satellite-borne high-resolution 3D imaging lidar
has found widespread applications in aerospace reconnaissance, deep-space detection, earth observation, disaster
evaluation, and so on. Based on the principle of 3D laser imaging, the typical satellite-borne high-resolution 3D active
imaging lidar systems are reviewed and the development trend is analyzed. Some conclusions can be drawn that operating mechanism of direct detection would be transferred to coherent detection and diode-pumped solid state laser
would be transferred to fiber laser. In addition, advanced synthetic aperture and array detection technology should be
adopted for higher range resolution.
A narrow-linewidth master-oscillator fiber power amplifier system with homemade large-mode-area fiber is
demonstrated. Some fundamental characteristics of this system, including the output power characteristics, the emission
spectrum characteristics, as well as the confirmation of single-frequency operation are investigated in detail. The system
generates up to 7.3 W of single-frequency radiation at a wavelength of 1064 nm with 39% slope efficiency and 26%
optical-optical power conversion efficiency.
The authors report stable short high-repetition-rate Q-switched pulses in acousto-optic Q-switched ytterbium-doped
double-clad fiber lasers. This device uses a diode pumped at 975 nm to end pump the large mode area double-clad fiber
laser. In the experiment acousto-optic modulator is used as a special Q-switching in the F-P cavity. As a result, sub 100
nanosecond pulses are obtained with varying the acoustic-optic repetition rate from 1 kHz to 100 kHz. The Q-switching
technique provides a novel method to generate short pulses at high repetition rate.
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