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I work on polarization based remote sensing and applications to better understand meteorology, estimation theory and image science, imaging operators and ideal observers of polarimeters in the presence of noise. I am interested in statistical operators applied to classical electromagnetics, machine learning (specifically manifold learning), using learned manifolds to drive insight into complicated physical problems, and general imaging/optics problems.


Sep
24
awarded  Autobiographer
Aug
12
comment Helicopter blades
Aliasing.......
Aug
12
comment What is “field size” when referring to perspective?
You are mostly correct, however the last paragraph needs to be more clear I think. The magnification ratio between the closer points and further points changes as the effective focal length of the lens changes...
Aug
12
comment Help calculating field of view for ball lens I just bought
I didn't do the calculations so I don't know the answer, but if the sensor is at the effective focus of the ball lens, you can't even define an object space FOV, you really only can give an object space NA. Are you imaging something a finite distance away (not objects at $\infty$)?
Aug
12
comment Optical absorption in multilayer structure
Is your incidence angle zero (i.e. perpendicular to the layer)? Also, I've seen people use the Fresnel reflectance equations incorrectly in situations like these, you will always get the right answer by using the amplitude equations...
Aug
12
comment Which of these theories on why light slows in media are true?
For #4, also think about conservation of momentum with a little bit of #2 mixed in...it isn't a billiard ball interaction, but the mass-spring formalism predicts all of it quite well, so well in fact it is what we use in graduate level optics (with a QM "correction constant"). Look up the Lorentz oscillator model...
Aug
11
revised Modeling the free space propagation of laser beams using Fourier transforms
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Aug
11
revised Modeling the free space propagation of laser beams using Fourier transforms
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Aug
11
revised Modeling the free space propagation of laser beams using Fourier transforms
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Aug
11
comment Modeling the free space propagation of laser beams using Fourier transforms
Also, if you write code for Fresnel, it will work in the far-field (Fraunhoffer) zone. I'll edit the above for the scales which are valid for each approximation. I believe that the Fresnel approximation is more stable numerically because some of the high frequency components of the actual free space transfer function are not well approximated when they are discretized. The Fresnel fixes this through a mathematical approximation...I didn't investigate fully however...
Aug
11
revised Modeling the free space propagation of laser beams using Fourier transforms
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Aug
11
comment Modeling the free space propagation of laser beams using Fourier transforms
It is, but it looses accuracy in the very near field you could say...prior to 1 or 2 wavelengths from your initial field.
Aug
9
comment quantum theory of light
He asked about the S-matrix in the quantum sense, not Jones or Mueller formalisms (which are purely classical).
Aug
9
comment Rational ratio of frequencies leads to isolating integral of motion
It likely has something to do with the relationship between being rational, and periodicity on a closed surface...I suspect that if it is rational, you can show that the curve is periodic on the surface (and if it is periodic it must intersect itself again at some point, forming a line...
Aug
9
comment Reconciling total internal reflection and the evanescent Wave
You can actually integrate the Poynting vector in the evanescent direction and you will get zero...
Aug
9
comment Fiber optics with broadband, incoherent light
"resonant" modes would propagate, other modes would not...
Aug
9
revised Modeling the free space propagation of laser beams using Fourier transforms
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Aug
9
answered Modeling the free space propagation of laser beams using Fourier transforms
Aug
9
comment Layer thickness measurement
You can use polarized light and different wavelengths to do this. If there is more than one coating I don't know if it is possible. With a single coating by measuring over wavelengths, and using polarization you can actually measure the dielectric tensor, which will give you the index of refraction.
Aug
9
revised About partially polarized light and the degree of polariztion
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