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International Conference Laser Optics (ICLO)

Nonstationary coherent optical effects in acetylene-filled hollow core photonic crystal fibers

Manuel Ocegueda, E. Hernandez, Serguei I. Stepanov, Peter M. Agruzov, Alexander V. Shamray

Published Jun 1, 2014• 0 citations
Publisher

Abstract

We report studies of the nonstationary coherent effects, i.e., free optical induction, optical nutation, and photon echo, in a hollow-core photonic crystal fiber filled with acetylene. Nanosecond optical pulses were used in the experiments. The transverse relaxation time was estimated to be about 3 nanoseconds.
DOI
10.1109/lo.2014.6886400

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Nonstationary coherent optical effects caused by pulse propagation through acetylene-filled hollow-core photonic-crystal fibers

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Experimental observations of nonstationary coherent optical phenomena, i.e., optical nutation, free induction, and photon echo, in the acetylene (${}^{12}$C${}_{2}$H${}_{2}$) filled hollow-core photonic-crystal fiber (PCF) are reported. The presented results were obtained for the acetylene vibration-rotational transition $P$9 at wavelength 1530.37 nm at room temperature under a gas pressure of 0.5 Torr. An all-fiber pumped-through cell based on the commercial 2.6-m-long PCF with a 10-\ensuremath{\mu}m hollow-core diameter was used. The characteristic relaxation time ${T}_{2}$ during which the optical coherent effects were typically observed in our experiments was estimated to be \ensuremath{\approx}8 ns. This time is governed by the limited time of the acetylene molecules' presence inside the effective PCF modal area and by intermolecule collisions. An accelerated attenuation of the optical nutation oscillations is explained by a random orientation of acetylene molecules.

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Latin America Optics and Photonics Conference•Jan 1, 2014•0 citations
Experimental observations of nonstationary coherent optical phenomena, i.e., optical nutation, free induction, and photon echo, in the acetylene (12{}^{12}12C2{}_{2}2​H2{}_{2}2​) filled hollow-core photonic-crystal fiber (PCF) are reported. The presented results were obtained for the acetylene vibration-rotational transition $P$9 at wavelength 1530.37 nm at room temperature under a gas pressure of 0.5 Torr. An all-fiber pumped-through cell based on the commercial 2.6-m-long PCF with a 10-\ensuremath{\mu}m hollow-core diameter was used. The characteristic relaxation time T2{T}_{2}T2​ during which the optical coherent effects were typically observed in our experiments was estimated to be \ensuremath{\approx}8 ns. This time is governed by the limited time of the acetylene molecules' presence inside the effective PCF modal area and by intermolecule collisions. An accelerated attenuation of the optical nutation oscillations is explained by a random orientation of acetylene molecules.
We report detailed experimental results on the optical nutation effect in acetylene-filled hollow-core photonic crystal fibers (HC-PCFs). This coherent quantum optical effect is manifested by the appearance of attenuated oscillations in the profiles of transmitted step-like coherent optical pulses. The experiments used 15 ns optical pulses with peak powers up to ∼4 W and centered at 1530.37 nm, which corresponds to the acetylene (12C2H2) vibration-rotation resonance absorption line P9. The all-fiber cell made from a HC-PCF with internal diameter ∼10.3 μm contained a gas pressure of about 0.12 Torr. The Maxwell-Bloch equations are used to analyze the influence of the homogeneous relaxation, the inhomogeneous Doppler broadening of the absorption line, and the random orientation of the acetylene molecules. By comparing the experimental results with numerical simulations, we obtain the longitudinal and the transverse relaxation times to be close to 10 ns and find that the transition dipole moment of the acetylene P9 absorption line is ∼1.36×10−32 Cm.
Experimental results on the transient optical nutation effect inside an acetylene-filled hollow-core photonic crystal fiber (HC-PCF) are reported. The experiments used 15 ns optical pulses with peak powers up to 5 W. The light wavelength was centered at 1530.37 nm, which corresponds to the P9 acetylene (12C2H2) vibrational-rotational absorption line. The gas pressure inside the PCF, with hollow core diameter of ∼10.3 μm, was kept around 0.12 Torr. Comparison of the experimental data with numerical simulations using the Maxwell-Bloch equations allowed us to evaluate the characteristic longitudinal and transverse relaxation times around 10 ns, as well as the transition dipole moment (1.36 × 10−32 Cm).
Low-pressure acetylene in the hollow-core photonic crystal structure fibers is an excellent medium for the room-temperature investigation of the coherent quantum effects in communication wavelength region. Pulsed excitation enables observation of new coherent phenomena like optical nutation or photon echo and evaluation of important temporal characteristics of the light-molecule interactions. We also report original experimental results on the pulsed excitation of the electromagnetically induced transparency in co- and counter-propagation configurations.
The delayed optical nutation effect has been used to evaluate the longitudinal relaxation time (T1) inside an acetylene-filled hollow-core photonic crystal fiber (HC-PCF) at room temperature. In this experiment, sequences of two short optical pulses of 30 ns and 15 ns in width, respectively, with the maximum peak power up to ∼2.5 W, were generated at a laser wavelength of 1530.37 nm, which corresponds to the acetylene ro-vibrational P9 absorption line. The gas pressure inside the 1 m-long HC-PCF varied in the range 0.1–1 Torr. Numerical simulations based on the optical Bloch equations allowed us to evaluate the longitudinal relaxation time as T1∼9ns, proving to be fundamentally limited by the transit-time broadening. Also, the obtained results revealed the influence of slow and fast molecules in the form of a non-exponential decay of the delayed-nutation signals.
In this work we report on the observation of photon echo inside acetylene-filled hollow-core photonic crystal fibers. The experiments were performed using a sequence of two short (~2ns) optical pulses tuned to the P9 (1530.37 nm) acetylene absorption line. The photon echo effect was observed on the basis of high optical powers (~4 W) and in the acetylene’s low pressure regime <0.5 Torr. The main results prove the formation of photon echo by showing that the obtained echo signals are consistent with the expected behavior, in intensity and optical delay, under variations of the input pulse separation.