TY - JOUR KW - Beam KW - Spectrometry KW - Thermal AU - Dorys Rojas AU - Robert J Silva AU - Jonathan D Spear AU - Richard E Russo AB -

A dual-beam thermal lens optical fiber spectrometer was developed and tested with aqueous solutions of the rare-earth ion Nd3+. An argon ion pumped dye laser beam was delivered to a sample cuvette through optical fibers of 100, 200, and 400 µm core diameter. The thermal lens signal was detected with a He-Ne laser guided to a photodiode detector by an optical fiber of 200 µm core diameter. Theoretical values for the optical aperture, excitation and probe beam radii, and distances from the sample to the probe beam waist and to the aperture-detector were calculated and compared to experimental results. Theoretical thermal lens enhancement factors that take into account the radius of the excitation beam show good agreement with the experimental values. A detection limit of 7 x 10-8 M and an enhancement factor of 0.9 were obtained for an Incident power of 25 mW and a power density of 31 W cm-2.

BT - Analytical Chemistry C2 - LBNL-31077 DA - 09/1991 DO - 10.1021/ac00018a007 IS - 18 LA - eng LB - Laser N1 -

LBNL-31077 NOT IN FILE

N2 -

A dual-beam thermal lens optical fiber spectrometer was developed and tested with aqueous solutions of the rare-earth ion Nd3+. An argon ion pumped dye laser beam was delivered to a sample cuvette through optical fibers of 100, 200, and 400 µm core diameter. The thermal lens signal was detected with a He-Ne laser guided to a photodiode detector by an optical fiber of 200 µm core diameter. Theoretical values for the optical aperture, excitation and probe beam radii, and distances from the sample to the probe beam waist and to the aperture-detector were calculated and compared to experimental results. Theoretical thermal lens enhancement factors that take into account the radius of the excitation beam show good agreement with the experimental values. A detection limit of 7 x 10-8 M and an enhancement factor of 0.9 were obtained for an Incident power of 25 mW and a power density of 31 W cm-2.

PY - 1991 SP - 1927 EP - 1932 ST - Anal. Chem. T2 - Analytical Chemistry TI - Dual beam optical fiber thermal lens spectrometry VL - 63 ER -