The physical mechanism behind frequency doubling can be understood as follows.ĭue to the χ (2) nonlinearity, the fundamental (pump) wave generates a nonlinear polarization wave which oscillates with twice the fundamental frequency.Īccording to Maxwell's equations, this nonlinear polarization wave radiates an electromagnetic field with that doubled frequency.ĭue to the requirement of phase-matching (see below), the generated second-harmonic field propagates dominantly in the direction of the nonlinear polarization wave. The article on nonlinear crystal materials lists a number of crystal materials, many of which are popular for frequency doubling.Įxamples are lithium niobate (LiNbO 3), potassium titanyl phosphate (KTP = KTiOPO 4), and lithium triborate (LBO = LiB 3O 5). Figure 1:Ī typical configuration for frequency doubling: an infrared input beam at 1064 nm generates a green 532-nm wave during its path through a nonlinear crystal. In most cases, the pump wave is delivered in the form of a laser beam, and the frequency-doubled (second-harmonic) wave is generated in the form of a beam propagating in the same or a similar direction. This process is also called second-harmonic generation. half the vacuum wavelength) in the medium. This can give rise to the phenomenon of frequency doubling, where an input (pump) wave generates another wave with twice the optical frequency (i.e.
SECOND HARMONIC GENERATION HOW TO
How to cite the article suggest additional literatureĬrystal materials lacking inversion symmetry can exhibit a so-called χ (2) nonlinearity (→ nonlinear crystal materials). More specific terms: resonant frequency doubling, intracavity frequency doubling
More general terms: nonlinear frequency conversion for calculating design details.Īcronym: SHG = second-harmonic generationĭefinition: the phenomenon that an input wave in a nonlinear material can generate a wave with twice the optical frequencyĪlternative term: second-harmonic generation
SECOND HARMONIC GENERATION SOFTWARE
Paschotta has extensive experience with nonlinear frequency conversion and a wide range of software e.g. Using our ad package, you can display your logo and further below your product description.Īsk RP Photonics for an optimized design of a frequency doubler, caring about all details.
0 kommentar(er)
