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