Hi Amit, 

I too have taken a look at your lens, and I have comments as well. But first, to set up your wavelength, you can simply set the wavelength manually. It looks like you have already done so, so no need to worry there. 

I agree with what David and Allie have stated, and I'll echo that the curvatures of the lenses are a major contributor to the performance, so please allow yourself the degrees of freedom that surface variables provide.

I noticed that the majority of your lenses are CaF2. While I can understand your choice for choosing low-dispersion glass, my understanding is that this material is notoriously scratch-prone, so I would not suggest it as your leading lens (in the front). Also, since your last lens, although aspheric, is also a low-ish dispersion glass, or crown glass, all four of your glass elements are low-dispersion crown-type glass. This will not allow for the canceling out of aberrations such as spherical aberration, which can be counteracted with a positive lens and a negative lens, and field curvature (Petzval sum) which can only be corrected by adding from flint glass (glass with high dispersion)

Your lens system has two lenses in front of the stop, and two lenses after the stop, but the two lenses in front are negative lens groups (they have negative focal length), and your two lenses after the stop are positive lenses. This causes an imbalance about the stop, where you have negative lenses in front of the stop and positive lenses in the back of the stop. This asymmetry about the stop will not help you to correct the odd aberrations, which are Coma and Distortion. Odd aberration correction is especially important when you want to increase the FOV, like you state since odd aberrations are primarily corrected with the power about the stop. 

My suggestion for a wide-angle system is to have a strong negative lens in the front, and subsequently have a good-performing normal FOV system but tweaked to counteract the aberrations caused by the front lens. This is easier said than done, but you can tap into years of design iteration by looking at retro-focus type lenses as a starting point. https://en.wikipedia.org/wiki/Ang%C3%A9nieux_retrofocus

Once you have a satisfactory performance with a moderate specification, then you can gradually increase the FOV to your target. In doing so, you may have to go back to the suggestions Allie stated, like adding lenses or adding aspheres. 

I hope this helps, and please don(t hesitate to ask for more help here. 

-Kats