¡¡¡¡Waveplates are made from birefringent material. The velocities of the extraordinaryand ordinary rays through the birefringent materials vary inversely with their refractive indices.The difference in velocities gives rise to aphase difference when the two beams recombine.In the case of anincident linearly polarized beam this is given by:¦Ä=2¦Ðd(ne-no)/¦Ë(¦Ä-phase difference; d-thickness; ne,no-refractiveindex of extraordinary and ordinary rays; ¦Ë-wavelength).At any specificwavelength the phase difference is controlled by the thickness of the waveplate. ¡¡¡¡ ¡¡¡¡We provides many kinds of waveplates, such as Low- order waveplate, Cemented Zero-Order waveplate, Airspaced Zero-Order waveplate, True Zero-Order waveplate and Dual wavelength waveplate. Also we provide waveplates with different retardation as half-wave, quarter-wave, octadic-wave and full-wave. If you want to order the specific retardation of waveplate for your system,High precision and mass production are available upon requirement for waveplate in Sinocera Photonics. Because we have high precision Waveplate-Master, which can test waveplate with retardation tolerance <¦Ë/600.
¡¡¡¡For examples:Dual wavelength waveplate is widely used on Third Harmonic Generation (THG) system. When you need a NLO crystal for type II SHG (o+e¡úe), and a NLO crystal for type II THG (o+e¡úe), theout put polarization from SHG can not be used for THG. So you must to turn the polarization to get two perpendicular polarization for type II THG. Dual wavelength waveplate works like a polarizing rotator, it can rotate the polarization of one beam and remain another beam¡¯s polarization. Also the dual wavelength waveplate can be applied to following systems:
¡¡Type II SHG + Type II THG ¡¡Type II SHG + Type I THG ¡¡Type I SHG + Type I THG
We provides standard waveplate wavelengths (nm) listed as below:
