In electro-optic modulation, the Pockels Cells based on the pockels effect is a common device for electro-optic modulation.
By applying electric field control to the electro-optic crystal, the refractive index of the electro-optic crystal in a certain direction can be changed，so that the electro-optic modulator pockels cells can be used as a variable half wave plate to change the polarization state. When the pockels cells of the electro-optic modulator is placed between two vertical polarizers, the luminous intensity modulation can be realized.The electro-optic effect can be divided into transverse electro-optic effect and longitudinal electro-optic effect. In transverse electro-optic effect, the propagation direction of light is perpendicular to the electric field, and the propagation direction of light in longitudinal electro-optic effect is parallel to the electric field.
The half wave voltage of longitudinal electro-optic effect is independent of crystal size, so it is difficult to realize high-frequency electro-optic modulation. The working principle of BBO pockels cells is based on transverse electro-optic effect, and its voltage formula is as follows：
Therefore, the half wave voltage can be reduced by changing the size of BBO crystal. Crylink can provide BBO pockels cells with different aperture and length, which can adapt to different environments. Due to its low ringing effect and high laser-damaged threshold, the maximum frequency of Crylink’s BBO pockels cells can reach 1MHz.
Crylink’s pockels cells uses protective window with high quality AR coating, which can ensure high transmission rate and prolong the service life of the device.
|Product type||Pockels Cells|
The laser-damaged threshold of the above products is ≤1GW/cm2@1064nm 10ns 10Hz
- Low ringing effect
- Low insertion loss
- Small and compact
- Multi wavelength selection
- High laser-damaged threshold
- High repetition rate DPSS Q-switch
- Pulse selection
- High repetition rate regenerative amplifier control
- Cavity dumping
- High frequency optical switch
- Beam chopper
- Optical power stabilizer