Due to polypropylene's significant absorption at the wavelength of 10.2 μm, there is a pressing demand for the 10.2 μm laser source in the field of polypropylene material processing. Based on the optimized coating of the output coupler and the theory of lasing spectroscopy, we established a seven-channel folded cavity radio frequency (RF) excited waveguide CO2 laser with the output wavelength of 10.2 μm. The laser utilized a seven-channel folded resonant cavity structure. The total discharged length along the resonator is 2.8 m while the physical length of the waveguide in the resonator direction is 425 mm. By optimizing the working gas pressure, the distance between the mirror and the waveguide port, the transmittance of the output coupler, output power of 108.5 W was achieved. The optimal coupling efficiency is 50% @10.2 μm. The beam quality M2 factor is less than 1.2. Since the laser has the features of compact design, good beam quality, and excellent power stability, it can be a preeminent illuminant for the processing of polypropylene materials.
Herein, we report a one-step laser writing method to form porous graphene on polyimide (PI), which is capable of broadband-spectral detection. By controlling different parameters of laser processed patterns, various samples were obtained. The comparative photoresponsivity and photocurrent curves of each porous graphene sample were obtained by conducting photoelectric testing at wavelength of 625 nm. The highest photoresponsivity obtained is 5.6´10-4 A/W, and the corresponding response and recovery times are 27 and 30 s. The method provides a new route to the fabrication of graphene photodetectors and promotes the development of future applications of optoelectronic devices in wearable and flexible electronics.
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