I'm having a brain freeze right now and I need some help. I have a 50/50 beamsplitter (non-polarizing) with 5% tolerance. Test measurement (with a laser at a certain wavelength) gave that I'm transmitting 5.36 units and reflecting 4.6 units (49.5 transmitted; 42.6% reflected). Units refer to a conversion unit of my detector that I can convert to nJ or W. Without the beamsplitter the total power is 10.82 units. If you add up the reflected and the transmitted powers, I get in total 9.97 units (there seem to be some losses in the the glass), using this total value I get the corresponding transmitted and reflected to 53% and 46% respectively. In another measurement (using another laser with the same wavelength as above) I can measure the reflected power P= 1,32 units. I need to know the total power coming into the beamsplitter. The transmitted is unknown in my setup since a camera is placed in this end. How can I determine the total energy from the 53:46 or 49.5:42.6 division by knowing the reflected percentage?