Theoretical analysis of a molecular optical modulator for a continuous-wave laser based on a hollow-core photonic crystal fiber

Shin ichi Zaitsu; Takumi Tanabe; Kota Oshima; Hiroyuki Hirata

doi:10.3390/app8101895

Theoretical analysis of a molecular optical modulator for a continuous-wave laser based on a hollow-core photonic crystal fiber

Shin ichi Zaitsu, Takumi Tanabe, Kota Oshima, Hiroyuki Hirata

Research output: Contribution to journal › Article › peer-review

Abstract

A THz optical modulator for a continuous-wave laser using a hollow-core photonic crystal fiber (HC-PCF) was proposed and theoretically analyzed. Lightwaves traveling through the HC-PCF is modulated by interactions with coherently driven Raman-active molecules in the core. The coherent molecular motion is excited by a pulse train having an interval between successive pulses shorter than the molecular dephasing time. In principle, a rotational transition of molecular hydrogen (S0(1)) at a pressure of 1 atm has a long enough dephasing time to maintain molecular coherence during a 1 GHz commercially available mode-locked pulse train. Optimization of the waveguide dispersion would enable phase-matching between the probe beam and generated sidebands during optical modulation. The proposed scheme would be achievable with a reasonable pump beam power and HC-PCF length, and with a feasible pressure of molecules in the core.

Original language	English
Article number	1895
Journal	Applied Sciences (Switzerland)
Volume	8
Issue number	10
DOIs	https://doi.org/10.3390/app8101895
Publication status	Published - Oct 12 2018

All Science Journal Classification (ASJC) codes

Materials Science(all)
Instrumentation
Engineering(all)
Process Chemistry and Technology
Computer Science Applications
Fluid Flow and Transfer Processes

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10.3390/app8101895

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title = "Theoretical analysis of a molecular optical modulator for a continuous-wave laser based on a hollow-core photonic crystal fiber",

abstract = "A THz optical modulator for a continuous-wave laser using a hollow-core photonic crystal fiber (HC-PCF) was proposed and theoretically analyzed. Lightwaves traveling through the HC-PCF is modulated by interactions with coherently driven Raman-active molecules in the core. The coherent molecular motion is excited by a pulse train having an interval between successive pulses shorter than the molecular dephasing time. In principle, a rotational transition of molecular hydrogen (S0(1)) at a pressure of 1 atm has a long enough dephasing time to maintain molecular coherence during a 1 GHz commercially available mode-locked pulse train. Optimization of the waveguide dispersion would enable phase-matching between the probe beam and generated sidebands during optical modulation. The proposed scheme would be achievable with a reasonable pump beam power and HC-PCF length, and with a feasible pressure of molecules in the core.",

author = "Zaitsu, {Shin ichi} and Takumi Tanabe and Kota Oshima and Hiroyuki Hirata",

note = "Funding Information: Funding: This research was partly supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS KAKENHI, Grant No. JP18K04982) (S. Zaitsu), research grants from The Mazda Foundation (S. Zaitsu) and The Murata Science Foundation (S. Zaitsu). Publisher Copyright: {\textcopyright} 2018 by the authors.",

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doi = "10.3390/app8101895",

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journal = "Applied Sciences (Switzerland)",

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AU - Zaitsu, Shin ichi

AU - Tanabe, Takumi

AU - Oshima, Kota

AU - Hirata, Hiroyuki

N1 - Funding Information: Funding: This research was partly supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS KAKENHI, Grant No. JP18K04982) (S. Zaitsu), research grants from The Mazda Foundation (S. Zaitsu) and The Murata Science Foundation (S. Zaitsu). Publisher Copyright: © 2018 by the authors.

PY - 2018/10/12

Y1 - 2018/10/12

N2 - A THz optical modulator for a continuous-wave laser using a hollow-core photonic crystal fiber (HC-PCF) was proposed and theoretically analyzed. Lightwaves traveling through the HC-PCF is modulated by interactions with coherently driven Raman-active molecules in the core. The coherent molecular motion is excited by a pulse train having an interval between successive pulses shorter than the molecular dephasing time. In principle, a rotational transition of molecular hydrogen (S0(1)) at a pressure of 1 atm has a long enough dephasing time to maintain molecular coherence during a 1 GHz commercially available mode-locked pulse train. Optimization of the waveguide dispersion would enable phase-matching between the probe beam and generated sidebands during optical modulation. The proposed scheme would be achievable with a reasonable pump beam power and HC-PCF length, and with a feasible pressure of molecules in the core.

AB - A THz optical modulator for a continuous-wave laser using a hollow-core photonic crystal fiber (HC-PCF) was proposed and theoretically analyzed. Lightwaves traveling through the HC-PCF is modulated by interactions with coherently driven Raman-active molecules in the core. The coherent molecular motion is excited by a pulse train having an interval between successive pulses shorter than the molecular dephasing time. In principle, a rotational transition of molecular hydrogen (S0(1)) at a pressure of 1 atm has a long enough dephasing time to maintain molecular coherence during a 1 GHz commercially available mode-locked pulse train. Optimization of the waveguide dispersion would enable phase-matching between the probe beam and generated sidebands during optical modulation. The proposed scheme would be achievable with a reasonable pump beam power and HC-PCF length, and with a feasible pressure of molecules in the core.

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Theoretical analysis of a molecular optical modulator for a continuous-wave laser based on a hollow-core photonic crystal fiber

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