Page Comparison

...

Then the power through an aperture P(r, z = 0) = P0 (1 - exp(-2r^2/w0^2)), if want P/P0 = 0.999, then r/w0 = sqrt(-1/2 ln(.001)) = 1.86, and P/P0 = 0.0001 has r/w0 = 2.145. This beam diameter is still under 15 um, so it very easily fits within the diameter of the photodiode.

Chromatic aberration

We want to calculate chromatic and spherical aberration

We have K9 glass, according to http://www.ygofg.com/products/Colorless_Filter_Glass/119.htm, 

Calculated the expected aperture diameter needed to capture a percentage of beam power as a function of wavelength, assuming the focal plane of the sensor is set at 700 mm. Calculations here: Chromatic Aberration.ipynb

Image Added

This is somewhat concerning...

spherical aberration:

Notes from  meeting on 6/9/2023 with Chris and Chuck

...