A new method for precisely measuring the optical phase retardation of wave-plates in the
infrared spectral region is presented by using modulated-polarized visible light. An electro-optic
modulator is used to accurately determine the zero point by the frequency-doubled signal of the
Modulated-polarized light. A Babinet-Soleil compensator is employed to make the phase delay
compensation. Based on this method, an instrument is set up to measure the retardations of the
infrared wave-plates with visible region laser. Measurement results with high accuracy and sound
repetition are obtained by simple calculation. Its measurement precision is less than and repetitive
precision is within 0.3%.
A high stable wavelength-tunable fiber laser is experimentally demonstrated by using a digital-micromirror-device (DMD) processor and a polarization-maintaining erbium-doped fiber amplifier (EDFA).The electronic-addressed DMD processor is able to select and couple a waveband from of the polarization-maintaining EDFA back into the fiber ring to generate a narrow line-width laser output. The tunable fiber laser shows a line-width of 0.02nm, a tuning step of 0.08nm over the c-band and a side mode suppression ratio (SMSR) greater than 50 dB. The output power uniformity of 0.016dB is achieved by using the automatic power control (APC) system under room temperature. The center wavelength fluctuation during 1 hour is below 0.01 nm.
It is important to acquire the proper parallax images for the stereoscopic display system. By setting the proper distance
between the cameras and the location of the convergent point in this capturing configuration, the displayed 3D scene
with the appropriate stereo depth and the expected effect in front of and behind the display screen can be obtained
directly. The quantitative relationship between the parallax and the parameters of the capturing configuration with two
cameras is presented. The capturing system with multiple cameras for acquiring equal parallaxes between the adjacent
captured images for the autostereoscopic display system is also discussed. The proposed methods are demonstrated by
the experimental results. The captured images with the calculated parameters for the 3D display system shows the
expected results, which can provide the viewers the better immersion and visual comfort without any extra processing.