I'm interested in generating entangled photons from barium borate but have a few questions: 1) Taking one of the virgin entangled photons- before any measurements - does it have a random polarization? Ie, if I put any polarizer in its path will 50% of photons make it through? 2) I know that the entangled photons are emitted off the main axis (? approx 3 degrees) - can this be used to ensure that only entangled photons are used - ie without the need for a coincidence counter? Would a narrow bandwidth filter help? 3) Could I buy a cheap blue laser from a standard electronics store and expect it to work? Any help would be greatly appreciated!