Rption spectroscopy experimental Structure diagram a folded-cavity enhanced absorption spectroscopy experimental
Rption spectroscopy experimental Structure diagram a folded-cavity enhanced absorption spectroscopy experimental setup. M1 4: mirrors; DFB: distributed feedback; PDA: photodetector; piezoelectric ceramic setup. M1 four: mirrors; DFB: distributed feedback; PDA: photodetector; PZT: PZT: piezoelectric ceramic transducer; ISO: optical isolator; P1, P2: line polarizer. transducer; ISO: optical isolator; P1, P2: line polarizer.In order to match the mode of resonant cavity together with the incident laser, we simulate To be able to match the mode of resonant cavity together with the incident laser, we simulate the the intrinsic cavity mode parameters in the folded cavity in advance. By adjusting the intrinsic cavity mode parameters from the folded cavity in advance. By adjusting the parameters parameters from the zoomable fiber collimator, the beam waist radius and beam waist disof the zoomable fiber collimator, the beam waist radius and beam waist distance on the tance of your incident Gaussian beam can be BSJ-01-175 Cell Cycle/DNA Damage changed. Here, the parameters from the zoomable incident Gaussian beam might be changed. Right here, the parameters of your zoomable collimator are collimator are set to 0.8 mm optical waist radius and 0.3 m optical waist position. It is set to 0.8 mm optical waist radius and 0.three m optical waist position. It can be practically identical to the almost identical to the resonant cavity’s intrinsic cavity mode at the laser’s center freresonant cavity’s intrinsic cavity mode at the laser’s center frequency laser plus the res(1512 nm), implying a quency (1512 nm), implying an ideal mode match between the incident perfectcavity. match among the incident laser plus the resonant cavity. mode onant When the resonance happens, the PDA1 (PDA10CS-EC, Thorlabs, Newton, NJ, When the resonance occurs, the PDA1 (PDA10CS-EC, Thorlabs, Newton, NJ, USA) USA) obtains parts of resonant light GS-626510 Biological Activity signal and sends the signal toto the high-speed data acquisition obtains components of resonant light signal and sends the signal the high-speed data acquisicard card (NI-PCI-4461, National Instruments, Austin, TX,USA) in Computer. The measurement protion (NI-PCI-4461, National Instruments, Austin, TX, USA) in Computer. The measurement gram obtains thethe peak light intensity signal corresponding towards the incidentlaser frequency program obtains peak light intensity signal corresponding for the incident laser freas the cavity-enhanced spectrum signal. At the samesame time,real-time intensity signal of quency as the cavity-enhanced spectrum signal. In the time, the the real-time intensity the laser the laser obtainedPDA2 is also is also recorded by the acquisition card. The laser signal of obtained by the by the PDA2 recorded by the acquisition card. The laser intensity intensity signal is used as a reference signal for the cavity enhancement to eliminate the effects signal is made use of as a reference signal for the cavity enhancement signalsignal to do away with the effects incident incident laser power fluctuations. The absorption data with the brought on by triggered bylaser power fluctuations. The absorption facts of the absorbing absorbing medium in could be obtained by Equation (2) [22]: medium in the cavitythe cavity is usually obtained by Equation (2) [22]:1- R I a= 1 – R(( 0I0- 1) ,), -1 = LL II(2)(two)Here, represents the gas absorption coefficient; c represents the speed of light;light; R Right here, represents the gas absorption coefficient; c represents the speed of R represents the productive reflectivity determined by the cavity of “empty cavity”;.