i am Akshay, new to zemax. I designed a spectrometer with mirror transmission grating and lens system. i could not able to focus the beam spot within airy disk diffraction limit.
i did optimisation added variables in the merit function editor , given weights changed them accordingly. i have seen some difference but not able to get it within the diffraction limit.
source as single mode fiber as point source with entrance pupil dia , 0.0042 mm
wavelengths 815,840(central wavelength),860
object distance 0.022 mm calculated for 1/e2 intensity NA at 0.09
parabolic mirror MPD139-M01 - thorlabs
focussing lens AC254 150B - thorlabs
i attached the file here.
i tried many things but cant figure it out myself , can anyone help me out , i will be grateful
Best answer by EthanView original
Apologies for the delayed response to your question. In case it is still relevant or for the benefit of others:
Optimizing an optical system can take practice and know-how. There are many pitfalls a system designer can make, like adding too many variables at once (or adding inconsequential variables), making poor choices on the initial system/components, and not using analysis tools sufficiently to understand where the aberrations in their system come from and how to correct them. There is a good webinar that touches on many points in optimizing your system that might help: Identifying aberrations with OpticStudio features - webinar – Knowledgebase (zemax.com).