THE BASIC PRINCIPLES OF PPKTP CRYSTAL

We have now purchased SPDC810 and hoped to use polarization-entangled photons in the beginning. But It appears this device doesn't have polarization-entangled photons. I'm wondering if you might update/modify our SPDC810 to really make it emit entangled photons.Can it be attainable to request a minimal tuning of the middle wavelength on the supply.