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Stable, precisely controlled, and switchable thulium-doped fiber laser based on cascaded mode interference filters
Optics Express
|April 6, 2021
Summary
This study presents a switchable fiber laser using a novel filter design. Bending the filter allows wavelength switching between 1982.54 and 1938.81 nm with high signal quality.
Area of Science:
- Optics and Photonics
- Fiber Laser Technology
Background:
- Fiber lasers are crucial for various applications, but achieving tunable or switchable wavelengths remains a challenge.
- Existing methods for wavelength tuning often involve complex setups or limited spectral ranges.
Purpose of the Study:
- To experimentally demonstrate a switchable, single-wavelength thulium-doped fiber laser.
- To investigate the use of a cascaded multimode-single-mode-multimode (MSM) fiber filter and a two-mode fiber (TMF) filter for wavelength control.
Main Methods:
- A thulium-doped fiber laser cavity was constructed incorporating cascaded MSM and TMF filters.
- The output spectrum was manipulated by inducing controlled bending in the MSM fiber filter.
- The laser's output characteristics were analyzed across different bending configurations.
Main Results:
- A switchable lasing wavelength output was achieved by bending the MSM fiber filter.
- The output wavelength could be switched between 1982.54 nm and 1938.81 nm.
- High optical signal-to-noise ratios (>40 dB) and stable performance (wavelength shift <0.01 nm, power fluctuation <0.31 dB) were demonstrated.
Conclusions:
- The proposed MSM and TMF fiber filter configuration enables effective wavelength switching in a thulium-doped fiber laser.
- The demonstrated laser offers stable and switchable wavelength output, suitable for applications requiring precise spectral control.
