Hi Avinash,

I presume you want to set the polarization of the pump and probe beams at the magic angle to each other. Yes a berek waveplate will work. We use a standard half wave plate, which rotates the polarization of linearly polarized laser beams, and a glan-laser polarizer to measure the polarization angle. 

So first we rotate the glan polarizer to obtain maximum transmission -- this tells you what angle the polarization currently is (e.g. horizontal) (note- to get the best measurement we actually rotate the glan polarizer for minimum transmission, then rotate by 90 degrees-- it's more accurate to find the minimum transmission than maximum). You would do this on your pump and probe beams (which presumably are the same). Then rotate the glan polarizer to the magic angle away from this (~54 degrees).  Now insert the half wave plate, and rotate this until you get maximum transmission again, on your pump or probe beam.

So essentially, use a half wave plate to rotate the polarization, and use a polarizer to measure it's set as you want it to be. 

We buy these components from Thorlabs. Note that different laser wavelengths require different anti-reflection coatings.

http://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=815

https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=711

Hi Avinash,

I presume you want to set the polarization of the pump and probe beams at the magic angle to each other. Yes a berek waveplate will work. We use a standard half wave plate, which rotates the polarization of linearly polarized laser beams, and a glan-laser polarizer to measure the polarization angle. 

So first we rotate the glan polarizer to obtain maximum transmission -- this tells you what angle the polarization currently is (e.g. horizontal) (note- to get the best measurement we actually rotate the glan polarizer for minimum transmission, then rotate by 90 degrees-- it's more accurate to find the minimum transmission than maximum). You would do this on your pump and probe beams (which presumably are the same). Then rotate the glan polarizer to the magic angle away from this (~54 degrees).  Now insert the half wave plate, and rotate this until you get maximum transmission again, on your pump or probe beam.

So essentially, use a half wave plate to rotate the polarization, and use a polarizer to measure it's set as you want it to be. 

We buy these components from Thorlabs. Note that different laser wavelengths require different anti-reflection coatings.

http://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=815

https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=711

Thanks Ben. Its a very clear and useful answer.