page_title: Nonlinear optics
section_title: Common SHG materials
hierarchical_section_title: Nonlinear optics / Common SHG materials
caption_attribution_description: English: The dark red Gallium Selenid in its bulk form.
context_page_description: Nonlinear optics is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the polarization density P responds non-linearly to the electric field E of the light. The non-linearity is typically observed only at very high light intensities such as those provided by lasers. Above the Schwinger limit, the vacuum itself is expected to become nonlinear. In nonlinear optics, the superposition principle no longer holds.
context_section_description: Ordered by pump wavelength:
  800 nm: BBO
  806 nm: lithium iodate (LiIO₃)
  860 nm: potassium niobate (KNbO₃)
  980 nm: KNbO₃
  1064 nm: monopotassium phosphate (KH₂PO₄, KDP), lithium triborate (LBO) and β-barium borate (BBO)
  1300 nm: gallium selenide (GaSe)
  1319 nm: KNbO₃, BBO, KDP, potassium titanyl phosphate (KTP), lithium niobate (LiNbO₃), LiIO₃, and ammonium dihydrogen phosphate (ADP)
  1550 nm: potassium titanyl phosphate (KTP), lithium niobate (LiNbO₃)
caption: Dark-red gallium selenide in its bulk form
exif: {}