class Cassegrain(optic.Optic):
"""Cassegrain Telescope
Milton Laikin, Lens Design, 4th ed., CRC Press, 2007, p. 198
"""
def __init__(self):
super().__init__()
# add physical aperture in primary mirror
aperture = physical_apertures.RadialAperture(r_max=np.inf, r_min=2)
self.surfaces.add(index=0, thickness=np.inf)
self.surfaces.add(
index=1,
thickness=-37.8137,
radius=-102.3640,
material="mirror",
conic=-1.075613,
aperture=aperture,
is_stop=True,
)
self.surfaces.add(
index=2,
thickness=48.8327,
radius=-35.3325,
material="mirror",
conic=-3.376732,
)
self.surfaces.add(index=3, thickness=0.25, radius=23.5556, material="N-SK16")
self.surfaces.add(index=4, thickness=0.36, radius=97.0299, material="LF5")
self.surfaces.add(index=5, thickness=0.3492, radius=-8.4651)
self.surfaces.add(index=6, thickness=0.25, radius=-6.0339, material="LLF1")
self.surfaces.add(index=7, thickness=0.5, radius=2.3002, material="LF5")
self.surfaces.add(index=8, thickness=5.4581, radius=8.5504)
self.surfaces.add(index=9)
self.set_aperture(aperture_type="imageFNO", value=10)
self.fields.set_type(field_type="angle")
self.fields.add(y=0)
self.fields.add(y=0.0976)
self.fields.add(y=0.1951)
self.wavelengths.add(value=0.55, is_primary=True)
