Tradebook for VPH grism diffraction efficiency v/s VPH grism fringe frequency

[DM1122]

Create a tradebook for analysis that compares the diffraction efficiency of a grism against its fringe density.

This involves the following tasks:

• Find/derive the governing equations for diffraction efficiency as a function of fringe density for a grism (a good resource to start with)
• Add the governing equations as an entry in the MCR document
• Implement the equations in the codebase
• Build a tradebook to plot diffraction efficiency vs fringe density