Found the reason why my eyes were straining. will explain after i explain the spectroscopy.

Since my project revolves around changing and understanding CIE coordinates of colors and converting those values to appropriate pwm signal for the lasers to result in a desired color, i had to find the exact wavelengths of lasers that i was using in order to get a gamut (region of colour space with all the colours available). 

For this i used a USB2000+ spectrometer from Ocean optics. a spectrometer basically tells you where the incident light lies on the wavelength scale and what the intensity or saturation is. I first tested with green laser. It was being problematic at first and showing multiple peaks which made us conclude that the laser needs to be exactly pointing to the slit, a slight deviation would result in multiple peaks. but even after adjusting it a multiple times we couldn't get rid of an IR peak at around 800nm which shouldn't be there.. it wasn't there with other lights.. just with this laser. It seems that the peak needs not be clipped for an accurate measurement, instead it needs to be smooth with no sharp edges. this can be fixed by reducing the intensity of the laser. i put an optical diffuser (sort of a lens that dims down light) in between the path of light and reduced the duty cycle of the laser to a value of 30 to get good results. So i got the following result from data captured with the spectrometer. 

We can ignore the rest and focus on the fact that at 528.455nm it was showing the highest saturation. Checking that it indeed was giving the write results i searched and it is indeed.

setting the usb2000+ inline with the beam was hard, the optical table did not have holes where i wanted them.. so i used a railing to put everything on it inline.. i then only had to change the vertical axis to bring it inline with the beam. I wonder now whether light transmission was supposed to be done with an appropriate fiber optic cable? I checked in the lab we had a fiber optic but no way to align the lasers small beam to fiber's small core. I wish i had sort of a collector for the light like a funnel. 

Next i have to find a way to generate PWM signal of the three lasers combined to result in a specific CIE coordinate. of course i'll start with one colour first. say different shades of green will have different CIE coordinates and that can be achieved with pwm duty cycle? i'm not sure gotta check.