This paper describes the temporal response of an acoustooptic spectrum analyzer to pulse-modulated cw signals. The detected waveforms from a real-time photodetector array are analyzed as a function of pulse width, weighting function parameters, and relative photodetector to spectral centroid location. The input pulse envelope is modified in the forms of signal duration stretching, the appearance of a flattop, multiple humps, and longer rise and fall times. Various schemes are discussed on the determination of the pulse width from the detected waveform.

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Journal Applied Optics
Lee, J.P.Y. (Jim P. Y.), & Wight, J. S. (1986). Acoustooptic spectrum analyzer: Detection of pulsed signals. Applied Optics, 25(2), 193–198. doi:10.1364/AO.25.000193