Optical heterodyne sampling device having probe and pump beams

Details Optical heterodyne sampling device having probe and pump beams Optical heterodyne sampling device having probe and pump beams

2006-10-20

2010-06-01

Sohn, Seung C (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S458100, C356S237100

Reexamination Certificate

active

07728317

ABSTRACT:
An optical heterodyne sampling device includes: two pulsed laser sources which may have a jitter and which can receive respectively a pump beam and a probe beam having respective repetition frequencies Fs and Fp, whereby Fs≠Fp; and an element for combining the pump beam and the probe beam which are intended to be passed over a sample, consisting of a signal channel including a system for the photodetection of the response signal from the sample and a system for acquiring the photodetected signal, which is connected to the signal channel. According to the invention, Fs and Fp are essentially constant and the acquisition system includes an acquisition trigger element. A synchronization channel is connected to the trigger element, and includes a device for measuring the beat frequency |Fs−Fp| which can generate a synchronization signal comprising pulses each time the pulses of the pump beam and the probe beam coincide.

REFERENCES:
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patent: 2004/0196453 (2004-10-01), Some
Rossignol et al., “Nondestructive evaluation of micrometric diamond films with an interferometric picosecond ultrasonics technique,” J. of Appl Phys., vol. 95, No. 8, pp. 4157-4162 (Apr. 15, 2004).
Cote et al., “Refractive index, sound velocity and thickness of thin transparent films from multiple angles picosecond ultrasonics,” Rev. of Sci. Inst., vol. 76, No. 5, pp. 53906-1-53906-6 (Apr. 29, 2005).
Spence et al., “Time synchronisation measurements between two self-modelocked Ti:sapphire lasers,” Optics Comm., vol. 101, No. 3/4, pp. 286-296 (Aug. 15, 1993).

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