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 journalArticlepeer-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 languageEnglish
Article number1895
JournalApplied Sciences (Switzerland)
Volume8
Issue number10
DOIs
Publication statusPublished - 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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