A novel polycarbonate (PC) was introduced to apply in the optical waveguide devices. PC has following distinct merits
than common polycarbonate: good processability, high thermal stability up to 293 C°; and high optical transparency.
Optical properties of absorption behavior and propagation loss were investigated in slab waveguides, and low
propagation losses of 0.335 dB/cm (@1550nm) and 0.197 dB/cm @632.8nm) have been achieved by using prismcoupler.
Additionally, straight optical waveguide and MMI coupler of ring resonator were fabricated using ultraviolet
(UV) cured resin Norland optical adhesive 61 (NOA61) as under or upper cladding layer and polycarbonate as
waveguide core-layer material through conventional methods such as spin coating, photolithography and reactive ion
etching (RIE). The process was studied in detail and the experimental results were given.
In accordance with the principle of Three-Line, this paper analyzed the correlation of every main parameter of internal
screw thread, and then designed a device to measure the main parameters of internal screw thread. Basis on the measured
value and corresponding formula calculation, we can get the internal thread parameters, such as the pitch diameter, thread
angle and screw-pitch of common screw thread, terraced screw thread, zigzag screw thread and some else. The practical
application has proved that this operation of this device is convenience, and the measured dates have a high accuracy.
Meanwhile, the application of this device's patent of invention is accepted by the Patent Office. (The filing number: