Much attention has been paid to the semiconductor-metal phase transition in vanadium dioxide nanomaterials,
accompanied with an abrupt change in its resistivity and near-infrared transmission. The phase transition and optical
properties of vanadium dioxide nanoparticles were studied by the mathematical model based on the complex refractive
changing with the temperature and wavelength. The optical properties of nano-array were investigated by using the
discrete dipole approximation and Mie scattering theory, as well as the absorption and scattering properties of small
particles. The results show that the main contribution to the optical response with variational wavelength in the infrared
is from absorption cross section comparing with the scattering cross section. It is obvious that the absorption peak of
metal phase occurs near 980nm. With the change of temperature, the variation of extinction coefficient is larger in the
infrared region than in the visible region. The largest change of extinction coefficient occurs in the near-infrared region.
The extincition coefficient is very small in the visible region and there is a maximal value in the infrared region in the
nano-array.
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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