SRW Coherent Gaussian Beam

This dialogue creates a Coherent Gaussian beam. The available parameters are:

• Average Photon Energy [eV] (assumes monochromatic photon beam)
• Energy per Pulse [J]
• Polarization (determines the Stokes parameters)
• RMS Pulse Duration [ps]
• Longitudinal Waist Position [µm] (Allows the user to create a Gaussian not at a waist)
• Definition of Beam Size (User can select the RMS waist or the RMS divergence. The other will then be determined by the equation \sqrt(<x^2> <x'^2>) = lambda/(4*pi). Wavelength is determined by lambda = hc/E. )
• RMS Waist [µm] (This determines <x^2> at the waist.)
• RMS Divergence [µrad] (This determines <x'^2> at the waist and beyond, since it will be conserved in free space.)
• Waist Offset [µm] (Allows the user to include a horizontal (?) position offset of the beam. )
• Beam Angle [mrad] (Allows the user to include a horizontal (?) angular offset of the beam. )