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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Tunable single-longitudinal-mode fiber optical parametric oscillator.

Sigang Yang1, Kim K Y Cheung, Yue Zhou

  • 1Photonic Systems Research Laboratory, Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong. yangsg08@gmail.com

Optics Letters
|February 18, 2010
PubMed
Summary
This summary is machine-generated.

This study demonstrates a tunable single-longitudinal-mode fiber optical parametric oscillator (FOPO). This device utilizes a sub-ring cavity and fiber loop mirror for stable, single-frequency laser output.

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Area of Science:

  • Photonics and Optics
  • Fiber Lasers
  • Nonlinear Optics

Background:

  • Single-longitudinal-mode (SLM) fiber optical parametric oscillators (FOPOs) are crucial for applications requiring narrow linewidth and stable laser sources.
  • Traditional FOPOs often face challenges in achieving stable single-frequency operation and wide tunability.
  • Mode suppression and fine mode restriction are key to obtaining SLM output in fiber laser systems.

Purpose of the Study:

  • To propose and experimentally demonstrate a novel tunable single-longitudinal-mode fiber optical parametric oscillator (SLM-FOPO).
  • To investigate methods for suppressing longitudinal modes and achieving stable single-frequency operation in a FOPO.
  • To evaluate the tunability range of the proposed SLM-FOPO.

Main Methods:

  • Implementation of a sub-ring cavity with a short cavity length to suppress unwanted longitudinal modes.
  • Integration of a fiber loop mirror, incorporating an unpumped erbium-doped fiber, as an autotracking filter for mode restriction.
  • Experimental verification of single-longitudinal-mode output using a homodyne measurement technique.

Main Results:

  • Successful demonstration of a tunable single-longitudinal-mode fiber optical parametric oscillator (SLM-FOPO).
  • The sub-ring cavity and fiber loop mirror effectively suppressed longitudinal modes, ensuring single-frequency operation.
  • The SLM-FOPO exhibited a tunable range of 14 nm for both signal and idler outputs, limited by the gain bandwidth.

Conclusions:

  • The proposed SLM-FOPO design, utilizing a sub-ring cavity and fiber loop mirror, is effective for achieving stable single-frequency operation.
  • The experimental results confirm the capability of the device for tunable, single-frequency laser generation.
  • This work presents a viable approach for developing advanced tunable fiber laser sources for various optical applications.