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When light from a femtosecond laser pulse is focused in a nonlinear crystal such as BBO or LBO, the strong nonlinear effects lead to the generation of photons at higher harmonics. Different optical setups allow for a number of higher harmonics, including second harmonic generation (SHG), third harmonic generation (THG) and fourth harmonic generation (FHG). The second harmonic generation (SHG) unit, third harmonic generation (THG) unit, and fourth harmonic generation (FHG) unituse the Ti:sapphire fundamental wavelength to generate a wide range of secondary wavelengths.
Second Harmonic Generator (Ti:sa)
When pumped with a standard Ti:sapphire laser operating in the near-ir (700-950 nm), the SHG unit will be in the long UV and visible blue (350 - 500 nm).
Third Harmonic Generator (Ti:sa)
When pumped with a standard Ti:sapphire laser operating in the near-ir (700-950 nm), the THG unit will output around 266 nm.
Fourth Harmonic Generator (Ti:sa)
When pumped with a standard Ti:sapphire laser operating in the near-ir (700-950 nm), the FHG unit will output around 200 nm. |
