Effects of modulation on signals obtained in saturated absorption spectroscopy experiments
Abstract
An analysis of the useful signals detected in saturated absorption spectroscopy experiments is given. Both Gaussian and plane-wave fields are considered. The various cases of unmodulated, square-wave modulated and sinusoidally modulated saturating beams are examined. It is found that square-wave and sinusoidal modulations give different results. The first is identical to no modulation, and detection at the fundamental frequency records a fraction of the total signal which is also a square wave. The second gives fundamental or higher-harmonic signals each with a very different dependence on the saturation parameter. The signal at the fundamental saturates faster and more completely than that for square-wave modulation. The results suggest experimental methods for the determination of the absolute value of the saturation parameter.
- Publication:
-
Applied Physics
- Pub Date:
- August 1978
- DOI:
- 10.1007/BF00885860
- Bibcode:
- 1978ApPhy..16..359C
- Keywords:
-
- Absorption Spectroscopy;
- Light Modulation;
- Nonlinear Optics;
- Signal Analysis;
- Signal Detection;
- Continuous Wave Lasers;
- Dye Lasers;
- Harmonic Analysis;
- Saturation;
- Sine Waves;
- Square Waves;
- Instrumentation and Photography;
- PACS 07.65;
- 07.65