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This group covers optical physics.
This group has five fields:

020501 Classical and Physical Optics
020502 Lasers and Quantum Electronics
020503 Nonlinear Optics and Spectroscopy
020504 Photonics, Optoelectronics and Optical Communications
020599 Optical Physics not elsewhere classified

Exclusions:
a) Quantum optics and atom optics are included in Group 0206 Quantum Physics.
b) Optical properties of materials are included in Group 0303 Macromolecular and Materials Chemistry.
c) Photonic and optical communications systems are included in Group 1005 Communications Technologies.
d) Nanophotonics is included in Group 1007 Nanotechnology.