spectral_focal_curve

esis.optics.poletto.spectral_focal_curve(wavelength, diffraction_order, alpha, beta, entrance_arm_radius, grating_tangential_radius, grating_linear_groove_coefficient=<Quantity 0. 1 / mm2>)

Equation 33 of Thomas and Poletto (2003) :type wavelength: astropy.units.Quantity :param wavelength: The wavelength at which to evaluate the spectral focal curve :type diffraction_order: astropy.units.Quantity :param diffraction_order: diffraction order of the light leaving the grating :type alpha: astropy.units.Quantity :param alpha: Nominal incidence angle of the beam on the grating. :type beta: astropy.units.Quantity :param beta: Nominal diffraction angle of the beam off the grating. :type entrance_arm_radius: astropy.units.Quantity :param entrance_arm_radius: Distance from the center of then grating to the center of the source. :type grating_tangential_radius: astropy.units.Quantity :param grating_tangential_radius: Tangential radius of the diffraction grating :type grating_linear_groove_coefficient: astropy.units.Quantity :param grating_linear_groove_coefficient: Linear coefficient for the polynomial variable line spacing :return: The length of the exit arm for optimal spectral focus

Parameters