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Technique for continuous tuning of optical fiber lasers
Applied Optics
|February 21, 2008
Summary
This study introduces thermally controlled fiber couplers and loop mirrors for broadband fiber laser tuning. This novel method enables continuous wavelength shifts without bulk optics, offering wide tuning ranges for Er and Tm fiber lasers.
Area of Science:
- Photonics and Laser Technology
- Optical Engineering
- Materials Science
Background:
- Fiber lasers are crucial for various applications, but achieving broadband tunability often requires complex bulk optical elements.
- Existing tuning methods can be limited in range or introduce undesirable losses and alignment sensitivities.
- Developing all-fiber, broadband tuning mechanisms is essential for compact and robust laser systems.
Purpose of the Study:
- To demonstrate the use of thermally controlled overcoupled fused fiber couplers and fiber loop mirrors as broadband tuning elements in fiber laser cavities.
- To achieve wide wavelength tuning ranges in erbium (Er) and thulium (Tm) doped silica fiber lasers without using bulk optical components.
- To investigate the relationship between coupler overcoupling and tuning range/sensitivity.
Main Methods:
- Fabrication and thermal control of overcoupled fused fiber couplers.
- Integration of these couplers into fiber loop mirrors for laser cavity applications.
- Implementation in both ring and linear cavity configurations for Er and Tm silica fiber lasers.
- Temperature-induced tuning of the coupling ratio and effective output coupler transmission.
Main Results:
- Continuous tuning of an Er silica fiber laser from 1527 nm to 1570 nm.
- Broadband tuning of a Tm silica fiber laser over 50 nm, from 1850 nm to 1910 nm, using a fiber loop mirror.
- Demonstration of all-fiber tuning, eliminating the need for bulk optical elements.
- Observation that tuning range and temperature sensitivity are dependent on the degree of overcoupling.
Conclusions:
- Thermally controlled overcoupled fused fiber couplers and fiber loop mirrors are effective broadband tuning elements for fiber lasers.
- This all-fiber approach offers a compact, robust, and efficient method for achieving wide wavelength tunability.
- The presented technique provides a significant advancement for tunable fiber laser systems, particularly for applications requiring broad spectral access.
