Increasing the sensitivity of laser ultrasonic detection in GaAs photo-EMF configuration under external DC bias

Mixcóatl, Juan Castillo; Montero, P. Rodriguez; Степанов, С. И.; Mansurova, S.

doi:10.1109/cleo.2001.948145

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2012

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“…for nondestructive testing of vibrations from rough surfaces in industrial environment. Due to its robustness, simplicity, and high sensitivity the photo-EMF based configuration was proposed for numerous practical applications such as laser vibrometry [2], laser induced ultrasonic detection [3], profilometry of rough surfaces [4], etc. [5]- [7].…”

Section: Introductionmentioning

confidence: 99%

Applying Non-Steady-State Photo-Emf Technique to Detection of Higher Order Auto Correlation Functions of Ultrashort Optical Pulses

Zarate

Shcherbakov

Mansurova³

2012

JART

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Here we examine a new application of the adaptive detectors based on non-steady-state photo-electro-motive force effect for the detection of higher order correlation functions, aiming the estimation of the parameters of ultra short optical pulses arranged in high-repetition trains. For this purpose three beam interferometer scheme with two signal beams modulated at different frequencies is proposed. Theoretical analysis of non-steady-state photo-EMF current generated by light distribution formed by superposition of three waves is performed and the possibility to detect simultaneously second and higher order correlation function is demonstrated. Potential advantages and disadvantages of such detection scheme for measuring the higher order auto-correlations functions are discussed.

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