Spectrum analyzer for

The experimental setup was virtually identical to that depicted in Fig. 3.11 with two broadband superluminescent diodes (2 mW) operating at 1,310 and 1,550 nm, respectively, and an optical spectrum analyzer for transmitted spectrum monitoring with a resolution of 0.05 nm. A holder similar to that used for the deposition was used to host the coated LPG allowing also the conveying of pure distilled water or polluted water as the case. The temperature was held constant at 20°C. 

S. Doerner, T. Schenieder and PR. Hauptmann, Wideband impedance spectrum analyzer for process automation... 

While method (a) is often used for high-resolution fluorescence spectroscopy with slow scan rates or for tuning pulsed dye lasers, method (b) is realized in a scanning confocal FPI (used as an optical spectrum analyzer) for monitoring the mode structure of lasers. 

A confocal interferometer, sometimes called incorrectly a spherical FPI, consists of two spherical mirrors Mi, M2 with equal curvatures (radius r) that are opposed at a distance d = r (Fig. 4.51a) [152, 153]. These interferometers have gained great importance in laser physics as high-resolution spectrum analyzers for detecting the mode structure and the linewidth of lasers [154-156], and, in the nearly confocal form, as laser resonators (Sect. 5.2). 

The second technique used the wave analyzer as a spectrum analyzer for the detected birefringence signal as the gel is griven at a fixed low frequency, v. A typical result of such a... 

Doemer, S., Schneider, T., Schroder,)., and Hauptmann, P. (2003) Universal impedance spectrum analyzer for sensor applications. Sensors, 2003. Proceedings of IEEE, Bd. 1, pp. 596-599. 

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