Diode laser atomic absorption using a new reference method
| Autor: | P.E. Walters, J.D. Winefordner, Tye E. Barber, M.W. Wensing |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Distributed feedback laser
Tunable diode laser absorption spectroscopy Active laser medium business.industry Chemistry Far-infrared laser Laser pumping Laser Atomic and Molecular Physics and Optics Analytical Chemistry law.invention Optics law Ultrafast laser spectroscopy Physics::Atomic Physics business Atomic vapor laser isotope separation Instrumentation Spectroscopy |
| Zdroj: | Spectrochimica Acta Part B: Atomic Spectroscopy. 46:1009-1014 |
| ISSN: | 0584-8547 |
| DOI: | 10.1016/0584-8547(91)80097-m |
| Popis: | A diode laser was used as the source for atomic absorption spectroscopy. To overcome the frequency instability and drift of the laser, a new referencing approach is proposed. The frequency of the laser is modulated across the rubidium transition at 780.02 nm, and the absorption signal is detected in an air/hydrogen flame. The absorption signal is processed by a lock-in amplifier. The reference signal for the lock-in amplifier is generated by shaping the absorption signal from a Rb atomic vapor cell into a square wave. As the laser frequency drifts, no phase change occurs between the reference and analytical signals, eliminating noise and signal loss that would have been caused by using a reference method which does not follow the fluctuations of the laser. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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