Vanadium dioxide as an optoelectronic material exhibits a phase transition between semiconductor and metallic phases
at a temperature around 68°C, which has attracted the attention of researchers for many decades. A proper theoretical
model was actually presented to analyze the infrared optical properties of vanadium dioxide film by using the theory of
multilayer matrix calculation and a mended Sellmeier dispersion model. According to the theoretical model, the
transmittances of the vanadium dioxide films were calculated at the temperature from 20°C to 100°C and the wavelength
ranged from 400nm to 2500nm. The vanadium dioxide films with different thickness were prepared by magnetron
sputtering on glass substrate, and the optical property measurement was carried out in the experiment. The simulated
calculation of the theoretical model and experimental curves fitted very well. Study on the vanadium dioxide thin film
thickness dependence of the optical properties, the transmittance of vanadium dioxide film reduced with the increasing in
the thickness of film, and thermal hysteresis loop became wide and the phase transition temperature rose with the
increasing in the thickness of the film. The thickness of the VO2 film had significant effect on its optical properties.
High-power single-mode 980nm pump lasers are the key components in optical fiber amplifier. Thermal management for
the telecom applications is a key design parameter for both package and system level. In this paper, based on the
designed structural and material parameters of Epi-down bonded uncooled 980nm laser, the heat distribution of Epi-down
bonded uncooled pump laser was simulated using the finite element method, and the photoelectric properties of
designed and packaged module were tested. A fiber output power of 200mW was achieved for the Epi-down bonded
uncooled 980nm laser with fiber Bragg grating, and module can work steadily over a wide temperature range of 0~70°C, with a small wavelength shift of 0.2nm, along with a FWHM less than 1.1nm, and a SMSR of more than 45dB.
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