Sub-ns optical phase demodulation in self-reference configuration using coherent 1530nm vibration-rotational transition of acetylene at mW-scale power (Conference Presentation)

Nayeli Casillas-Rodríguez; Serguei Stepanov; Manuel I. Ocegueda-Hernández; Eliseo Hernández-Hernández

doi:10.1117/12.2508094

4 March 2019 Sub-ns optical phase demodulation in self-reference configuration using coherent 1530nm vibration-rotational transition of acetylene at mW-scale power (Conference Presentation)

Nayeli Casillas-Rodríguez, Serguei Stepanov, Manuel I. Ocegueda-Hernández, Eliseo Hernández-Hernández

Author Affiliations +

Proceedings Volume 10934, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology; 109340I (2019) https://doi.org/10.1117/12.2508094
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Detection of fast optical phase modulation is a critical procedure in different areas of modern optical technology. Conventional homodyne detection technique needs mixing with the local oscillator, or with the reference wave, phase-locked with the detected wave with the quadrature phase difference (+/-)Pi/2 for linear demodulation. Additional complications appear from the necessity to ensure similarity of polarizations of these two light-waves and their complicated wave-fronts in case of detection of the light reflected from a rough inspected surface. All these problems can be solved in the self-reference configuration based on confocal Fabri-Perot cavity, but it is complicated and needs frequency-locking with the detected wave. We propose utilization of phase memory of an ensemble of acetylene molecules (C2H2) vibration-rotational transitions for a self-reference homodyne detection of sub-ns optical phase modulation in 1520-1540nm wavelength range. In the reported configuration, the collinearly propagating dipole radiation of the excited by the incident light two-level centers acts like the coherent properly phased reference wave necessary to transform the phase modulation into the intensity one. It is experimentally demonstrated in the optical fiber compatible hollow-core photonic crystal fiber cell filled with the 0.4Torr gas at 1530nm wavelength of the acetylene P9 absorption line at the sub-mW scale cw power. The response to the detected phase modulation was quadratic when the acetylene inhomogeneous absorption line was excited in its center but was linearized by tuning to one side of the absorption line. Similar self-reference detection of the multimode wavefronts is also possible in the bulk gas cells.

Conference Presentation

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Nayeli Casillas-Rodríguez, Serguei Stepanov, Manuel I. Ocegueda-Hernández, and Eliseo Hernández-Hernández "Sub-ns optical phase demodulation in self-reference configuration using coherent 1530nm vibration-rotational transition of acetylene at mW-scale power (Conference Presentation)", Proc. SPIE 10934, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology, 109340I (4 March 2019); https://doi.org/10.1117/12.2508094

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KEYWORDS

Phase shift keying

Demodulation

Phase modulation

Absorption

Homodyne detection

Confocal microscopy

Inspection

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