Thermal lens spectroscopy using a diode laser and optical fibers

Journal Article · Fri May 01 00:00:00 EDT 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1142597· OSTI ID:7046367

Rojas, D; Silva, R J; Russo, R E ^[1]

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1. Lawrence Berkeley Laboratory, Applied Science Division, MS 90-2024, Berkeley, California 94720 (United States)

A compact thermal lens spectrometer was developed using optical fibers and a diode laser for measurements of rare earth species in aqueous solutions. A cw GaAlAs diode laser coupled with a multimode step-index fiber was used as the excitation source. The thermal lens was probed with a He-Ne laser using a multimode 200 {mu}m diameter core optical fiber as the aperture and to transmit the probe beam to the detector. The system was tested for the detection of Nd{sup 3+} in aqueous solutions at 794.6 nm. A sensitivity with detection limit of 79{plus minus}4 {ital M}{sup {minus}1} and 8{times}10{sup {minus}5} {ital M} was obtained for an incident power of 10 mW and a power density of 11 W/cm{sup 2}.

• OSTI ID: 7046367
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:5; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

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