Mr. Lu Zhang Profile

Lu Zhang

at Shaanxi Earthquake Agency

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Proceedings Article | 18 January 2019 Paper

Research on reflection characteristics for a rectangular laser pulse passing through a Fabry-Perot interferometer

Shichao Xu, Mingshi Luo, Lu Zhang

Proceedings Volume 10839, 108390B (2019) https://doi.org/10.1117/12.2504869

KEYWORDS: Fabry–Perot interferometry, Reflectivity, Rectangular pulse, Computer simulations, Phase measurement, Sensors

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Rectangular laser pulse has a steep rising and falling edge, and the time scale of the rising or falling rate can reach nanosecond, which is close to the single round-trip time of light traveling in the Fabry-Perot interferometer. When the falling edge of the rectangular laser pulse is incident to the Fabry-Perot interferometer, the reflection intensity of the Fabry-Perot interferometer drops down to zero or near-zero at some point due to the rapid decline of amplitude. Moreover, the reflected light intensity shows the different decline rates under the different phase difference of the light propagating through the Fabry-Perot interferometer before the build-up of steady state for multiple-beam interferences, which provides a new way of thinking for the new measurement technology of Fabry-Perot interferometer. In this paper, the time response of the reflection intensity of the Fabry-Perot interferometer is studied. The dependence of the reflection intensity and energy on the phase difference in the Fabry-Perot interferometer is obtained. By optimizing the parameters of the rectangular laser pulse and the Fabry-Perot interferometer, the sensitivity of the reflected light intensity to the phase difference of the Fabry-Perot interferometer could be improved.

Proceedings Article | 23 October 2018 Paper

Temporal response and sensing properties of reflected light for a rectangular laser pulse incident to a Fabry-Perot interferometer

Shichao Xu, Lu Zhang, Mingshi Luo, Yuan Fa

Proceedings Volume 10821, 108211G (2018) https://doi.org/10.1117/12.2500694

KEYWORDS: Signal to noise ratio, Rectangular pulse, Fabry–Perot interferometry, Sensing systems, Absorption, Laser applications

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With the development of laser technology, rectangular laser pulses can get narrower rising and falling edge, and the time scale of the rising or falling edge can reach nanosecond. When the falling edge of a rectangular laser pulse is incident to a Fabry-Perot interferometer and the time scale is less than the single round-trip time of light traveling in the Fabry-Perot cavity, the fast degradation of incident light intensity causes the change of the reflected light intensity and energy. The reflected light intensity and energy vary with the time scale of the rectangular laser pulse for an invariant phase difference of the light propagating through the Fabry-Perot cavity. For a fixed time scale of the rectangular laser pulse, the intensity and energy of reflected light vary with the phase difference. In this paper, the temporal response of the reflected light intensity and energy of the Fabry-Perot interferometer is studied, and a high precision sensing scheme can be achieved. To improve the sensitivity of the reflected light energy to phase difference by optimizing the parameters of the rectangular laser pulse and the Fabry-Perot interferometer, we calculate the signal-to-noise of the reflected light energy versus the response time, reflectivity and phase difference of Fabry-Perot interferometer. Furthermore, we analyze absorption property of the Fabry-Perot interferometer to expand the field of application of this sensing scheme.

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