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Single-longitudinal mode laser structure based on a very narrow filtering technique.

L Rodríguez-Cobo1, M A Quintela, S Rota-Rodrigo

  • 1Photonics Engineering Group, Universidad de Cantabria, Av. Los Castros s/n, 39005, Santander, Spain. luis.rodriguez@unican.es

Optics Express
|April 24, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel narrow filtering technique using two Fiber Bragg Gratings (FBGs) to achieve stable Single Longitudinal Mode (SLM) laser operation. The method ensures consistent laser performance despite environmental changes like temperature and strain.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Materials Science

Background:

  • Single Longitudinal Mode (SLM) lasers are crucial for applications requiring high spectral purity.
  • Traditional methods for achieving SLM operation can be complex and sensitive to environmental fluctuations.
  • Fiber Bragg Gratings (FBGs) offer versatile spectral filtering capabilities.

Purpose of the Study:

  • To propose and demonstrate a novel narrow filtering technique for obtaining SLM laser operation.
  • To investigate the effectiveness of spectrally detuned FBGs in narrowing filter bandwidth.
  • To assess the stability of the SLM laser under varying temperature and strain conditions.

Main Methods:

  • A narrow filtering technique was designed utilizing the spectral overlapping of two uniform Fiber Bragg Gratings (FBGs).
  • The FBGs were spectrally detuned to minimize coincident reflection, thereby narrowing the equivalent filter bandwidth.
  • A proof-of-concept linear laser cavity was constructed and experimentally tested.

Main Results:

  • The proposed technique successfully narrowed the effective filter bandwidth.
  • The constructed laser demonstrated stable Single Longitudinal Mode (SLM) operation.
  • The SLM performance remained consistent despite applied temperature and strain variations.

Conclusions:

  • The spectrally detuned FBG technique provides an effective method for achieving narrow filtering in lasers.
  • This approach enables robust SLM laser operation, resilient to environmental disturbances.
  • The demonstrated technique offers a promising solution for stable, high-performance laser systems.