deletions | additions       diff --git a/A_laser_contains_two_types__.tex b/A_laser_contains_two_types__.tex  index 15b93df..c8a147f 100644  --- a/A_laser_contains_two_types__.tex  +++ b/A_laser_contains_two_types__.tex 
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A laser contains two types of polarized light—s-polarized and p-polarized. Therefore, we can use a half wave plate (not shown) to adjust the ratio of s-polarized and p-polarized light in the beam, and then use a polarizing beam splitter (PBS) to split the beam into two, two  differently polarized beams beams, of which we can adjust the intensity by adjust the ratio  of adjustable intensity. p-polarized and s-polarized light using the half wave plate.  We sent our beam through a polarizing beam splitting, adjusting the polarization so that the s-polarized light, scattered from the PBS, was much stronger that the p-polarized light, which passes through the PBS. We used the s-polarized beam as our stronger pump beam with a power of 0.72 mW, and the p-polarized beam as our weaker probe beam at 66 μW. With our setup, that means that the photodiode is detecting the weaker probe beam. The photodiode was then attached to the amplifier and sent to the oscilloscope for data collection.   The Doppler broadened curve for saturation absorption spectroscopy is still a convolution between a Gaussian and a Lorentzian. The saturated absorption peaks, where the probe beam is not absorbed, have a Lorentzian lineshape as described above. When we examined our data, we found that we could see evidence of hyperfine structure, but because of the oscilloscope resolution and the large frequency width of our scan, we could not resolve the hyperfine structure.