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Ultrafast Laser Energy Density and Retinal Absorption Cross-Section Determination by Saturable Absorption Measurements

DOI: 10.4236/jasmi.2014.41003, PP. 19-26

Keywords: Laser Pulse Peak Energy Density Determination, Ground-State Absorption Cross-Section Determination, Excited-State Absorption Cross-Section Determination, Saturable Absorption, ADS084BE Dye, Histidine Kinase Rhodopsin HKR1, Retinal Schiff Base RetA Cofactor, Number Density Determination

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Laser pulse nonlinear transmission measurements through saturable absorbers of known absorption parameters allow the measurement of their energy density. On the other hand, nonlinear transmission measurements of laser pulses of known energy density through absorbing media allow their absorption parameter determination. The peak energy density w0P of second harmonic pulses of a mode-locked titanium sapphire laser at wavelength λP = 400 nm is determined by nonlinear energy transmission measurement TE through the dye ADS084BE (1,4-bis(9-ethyl-3-car-bazovinylene)-2-methoxy-5-(2’-ethyl-hexyloxy)-benzene) in tetrahydrofuran. TE(w0P) calibration curves are calculated for


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