SAM – saturable absorber mirror

T(t) = T max exp(-t/τ )]withT(t)T maxtτtime dependent transmittacesaturated transmittancetimerelaxation time constant> Effective saturation intensity I sat,effThe effective saturation intensity I sat,eff is related to the effective saturation fluence Φ sat,eff byΦ sat,eff = I sat,eff τ.With Φ sat,eff = 7 µJ/cm 2 and τ = 10 ps the effective saturation intensity is I sat,eff = 700 kW/cm 2 .> BandwidthThe spectral bandwidth of the SANOS is gouverned by the used RSAM bandwidth. A compromise isneeded between a large bandwidth and a low saturation fluence Φ sat , because the saturation fluencedecreases together with the bandwidth. A typical bandwidth (FWHM) of ~ 20 nm is possible for a SANOSwith Φ sat = 5 µJ/cm 2 . The usuable spectral bandwidth ∆λ around the low-intensity minimum transmittanceis by a factor of 5 ... 10 smaller than the FWHM and is therefore only some nanometers.SeongKyeong Photonics 25 info@skphotonics.com