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Virtual FBGs Using Saturable Absorbers for Sensing with Fiber Lasers
Luis Rodriguez-Cobo1, Rosa A Perez-Herrera2, María A Quintela3
1CIBER-bbn, Instituto de Salud Carlos III, 28029 Madrid, Spain. luis.rodriguez@unican.es.
Sensors (Basel, Switzerland)
|October 27, 2018
Summary
Unpumped Er-doped fiber (EDF) acts as a virtual Fiber Bragg Grating (FBG), effectively narrowing spectral output in fiber lasers. This method enhances spectral stability for laser cavities and sensor applications.
Area of Science:
- Optics and Photonics
- Laser Physics
- Fiber Optic Sensing
Background:
- Fiber Bragg Gratings (FBGs) are crucial for wavelength selection in fiber lasers.
- Spatial hole burning (SHB) in gain media can influence spectral characteristics.
- Er-doped fiber (EDF) is commonly used in fiber laser systems.
Purpose of the Study:
- To analyze spectral narrowing of FBGs using unpumped EDF in fiber lasers.
- To investigate the potential of EDF as a virtual FBG for spectral control.
- To evaluate the stability of this spectral narrowing effect for laser and sensing applications.
Main Methods:
- Experimental setup of a common fiber laser (FL) to analyze spectral stability.
- Characterization of an FL sensor for strain and temperature measurements.
- Utilizing unpumped EDF to induce spectral narrowing via spatial hole burning.
Main Results:
- Demonstrated significant spectral narrowing of uniform FBGs.
- Unpumped EDF effectively functions as a virtual FBG.
- The spectral narrowing effect showed good stability in laser and sensor configurations.
Conclusions:
- Unpumped EDF provides an effective method for spectral narrowing in fiber lasers.
- This technique enhances spectral stability and offers potential for fiber optic sensing.
- The virtual FBG approach using EDF is a promising development in laser and photonic systems.
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