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The tuning characteristics of non-collinear double QPM (NDQPM)optical parametric amplification with single periodically poled RbTiOAsO 4 (PPRTA) for the pump 526nm and 800nm have been investigated theoretically. The double phase matching can be realized over wider regions of the mid-infrared when grating period Λ is selected properly. The combination of temperature tuning and poling period...
For the requirements of constant temperature on device, that completes high-precision automatic system control through the fuzzy-PID hybrid control technology, by AT89C52 as the control center. The results show that the tank temperature stable operation, the system under constant temperature control accuracy ± 0.1, to meet the design accuracy.
An efficient technique is reported for reducing the spectral shift of the polymer arrayed waveguide grating. The designed value of the central wavelength is 1550.918 nm, and the measured central wavelength is 1550.911nm. By regulating the spin-coating rate to control the polymer core thickness in the fabrication of the device, the spectral shift of the device can be reduced obviously, the spectral...
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