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Passively mode-locked fiber laser based on GeTe as a saturable absorber
Applied Optics
|January 6, 2023
Summary
This study demonstrates a new Germanium Telluride (GeTe) saturable absorber for ultrafast photonics. The GeTe absorber achieves stable mode-locking, showing significant potential for advanced laser applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Ultrafast photonics relies on advanced materials for laser mode-locking.
- Saturable absorbers are key components for generating ultrashort optical pulses.
Purpose of the Study:
- To fabricate and characterize a novel saturable absorber based on Germanium Telluride (GeTe) nanosheets.
- To investigate the mode-locking performance of the GeTe saturable absorber in an ultrafast laser system.
Main Methods:
- Fabrication of GeTe nanosheets for use as a saturable absorber.
- Integration of the GeTe saturable absorber into a fiber laser cavity.
- Characterization of laser output including power, repetition rate, central wavelength, and bandwidth under different pump powers.
Main Results:
- Achieved stable conventional soliton and stretched soliton mode-locking.
- Demonstrated output power scaling from 0.93 mW to 10.46 mW with increasing pump power.
- Obtained a maximum average single-pulse energy of 0.86 nJ for the stretched soliton state.
- Measured a central wavelength of 1564.72 nm and a 3 dB bandwidth of 4.78 nm.
Conclusions:
- GeTe-based saturable absorbers exhibit excellent performance for ultrafast laser applications.
- The material shows broad application potential in the field of ultrafast photonics.
- Further research can explore GeTe for diverse photonic device applications.
