Recent content by Gleb1964

May be this picture helps. Think about Lens 2 as a microscope looking at DMD pixels. Its resolution would be defined by the numerical aperture of Lens 2 in the object space (at DMD object), meaning how width angle of diffracted from DMD object would be accepted by lens 2 and consecutive optics...

Not correct. Diffraction limitation of the illumination beam is not connected to the DMD pixel size and it resolution. The size of illumination beam is only defining the size of illuminated area at DMD. The resolution of the DMD projection is defined by the size of field aperture located at...

Apart from cloud reflectance, there is a significant path within the atmosphere where water vapor efficiently absorbs signals at 940 nm.

Isn't 940nm close to the water absorption peak?

Only one point (or line) of detector would fulfil null, but not the other area of extended detector.

"MLA"- Micro Lens Array I suppose.

For a single spherical mirror, the stop can be placed: At the center of curvature, resulting in an aplanatic design. At the focal distance, resulting in telecentricity. At the mirror, as many telescope designs do. Somewhere else, aiming to trade off the above properties. It is up to the...

The problem is that Zemax doesn't know where you intend to set the stop. For example, you have just a spherical mirror (or lens). Where Zemax should place a stop? Zemax cannot define it itself.

Whilst for some optical systems the position of the stop is well established, it is beneficial to provide optical designers with the freedom to choose the stop position freely. This is particularly important when combining many optical components into one system with multiple apertures. In...

I don't see a reason to have a mirror at the Fourier plane. The mirror surface is "invisible." Probably, it should be an object or source placed at the Fourier plane through the mirror reflection. Right?

The process of parallel beam propagation does not need any optics. But the interaction of the beam with DMD mirror would result some diffraction light out of parallel beam direction. That diffracted light contains all the information about interaction. If the optical relay can intercept that...

In that case you would not have pixels projection at your sample plane because diffraction would vanish details. In the initial post you have mentioned that you want project DMD pixels:

Regarding this item: your system looks like it not focused, it would not deliver any image. If your aim to reimage DMD pixels you need an optical relay with linear magnification -0.6x, presumably double telecentrical in object and image space. Something like this: The performance of optical...

To emphasize what I mentioned earlier about aperture filtering: When we reimage a periodic object (such as a grating), it produces multiple diffraction orders. If we filter and recombine only the 0th and 1st orders, we obtain a sinusoidal carrier frequency of the periodic object. To achieve a...

The aperture acts as a lowpass filter, destroying high frequencies. I doubt that your projection would resolve pixels taking into account wave nature of light. The geometrical raytracing may show that pixels are resolved, but diffraction would vanish the sharp details.