Simulated SLM and camera different pixel properties

[lufermar]

Hello again,
I am trying to simulate some SLM-camera experiments to play with the code and in the computational example you define the same pixel numbers and pixel pitch. I tried to make them different but my far_field and near_field plots have the same pixel size, corresponding to the SLM (so it looks like my camera has the same pixel properties as the SLM). I know that the command cameraslm works for the hardware code, but I am missing something for the simulations. Could you give me a hint on how to proceed?

Best,
L

[ichristen]

Hi @lufermar ,

The padded SLM nearfield and SLM farfield will have the same pixel number, as these are related by a FFT. The camera field of view is a separate measure and will have some overlap with the SLM farfield, such as the below image from the readthedocs examples. This is because practical alignment of the camera and SLM is, naturally, not a perfect correspondence. Experimental measurement of this mapping between the camera and SLM coordinates is done via a FourierSLM through the fourier_calibrate() function.

In the main branch, one cannot currently simulate the above transformations or calibrations. However, @cpanuski has been working on the sim branch which is able to simulate all of this stuff without hardware. You can take a look at this example which is not yet on readthedocs, but is the test notebook for the sim branch. This may be on main within a month or so (#15), but in the meantime, you can checkout the sim branch locally to try out these features.

Hope this helps!