|
ωp - ωs =
ωi (or 1/λp -1/λs = 1/λi in
wavelength)
It splits one high-energy photon into two
low-energy photons. |
Optical Parametric Generation |
For example:
355 nm ---->532 nm + 1064 nm
Optical Parametric Generation (OPG) is an inverse
process of Sum Frequency Generation. It splits one high-frequency photon
(pumping wavelength, lp) into two low-frequency photons (signal, ls, and idler
wavelength, li). If two mirrors are added to form a cavity as shown in
following Figure, an Optical Parametric Oscillator (OPO) is established. For a
fixed pump wavelength, tilting a crystal can generate an infinite number of
signal and idler wavelengths. Therefore, OPO is an excellent source for
generating wide tunable range coherent radiation. BBO, KTP, LBO and LiNbO3 are
good crystals for OPO and Optical Parametric Amplifier (OPA)
applications. 
Optical Parametric Oscillator |
