Scheme of Laser-Induced Photoacoustic Spectroscopy

• Nd:YAG: Laser that induces laser pulses at 355 nm (third harmonic)
• OPO /FDO: Tunable solid state laser (OPO : 440 nm – 690 nm) and frequency doubling (FDO : 220 nm – 440 nm)
• FHG: Generation of fourth harmonic from 1064 nm (fundamental) used for TRLFS
• Controller: Onboard PC to control wavelength steps of OPO/FDO
• Attenuator: Optic device to influence the laser power (max. 5 mJ)
• Cuv : Cuvette, contains the sample under study
• PCT : Pieco-ceramic tranducer
• Energy meter : Determination of actual laser power
• Preamplifier / Spectroscopic amplifier : Impedance change and signal amplifier
• Boxcar / Oscilloscope : Measuring devices for detection of elellctrical signals of transduced PA-wave
• Delay Generator

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