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Ultrafast fiber laser based on HfSe2 saturable absorber
Xu Wu1,2, Zewen Zhou1, Jinde Yin1
1Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China.
Nanotechnology
|February 27, 2020
Summary
Hafnium diselenide (HfSe2) nanosheets function as a high-quality saturable absorber (SA) for ultrafast lasers. This HfSe2 SA enables efficient generation of ultrashort laser pulses with remarkable stability and energy.
Area of Science:
- Materials Science
- Optoelectronics
- Laser Physics
Background:
- Saturable absorbers (SAs) are crucial for generating ultrashort laser pulses.
- Developing novel SA materials with superior nonlinear optical properties is an active research area.
- Hafnium diselenide (HfSe2) is a promising two-dimensional material with potential optoelectronic applications.
Purpose of the Study:
- To demonstrate the efficacy of HfSe2 nanosheets (NSs) as a saturable absorber (SA) for ultrafast pulse laser generation.
- To fabricate and characterize a HfSe2-based SA device.
- To investigate the performance of a laser system utilizing the HfSe2 SA.
Main Methods:
- Fabrication of HfSe2 SA by integrating HfSe2 NSs with a microfiber.
- Characterization of HfSe2 NSs' material and optical properties.
- Measurement of nonlinear optical absorption, including modulation depth.
- Realization and analysis of a soliton mode-locked fiber laser.
Main Results:
- High-quality HfSe2 NSs were synthesized and characterized.
- The HfSe2 SA exhibited a nonlinear optical absorption with a modulation depth of 5.8%.
- A stable soliton mode-locked fiber laser was achieved at a central wavelength of 1561.43 nm.
- The laser produced pulses with a duration of 297 fs and a maximum pulse energy of 2.68 nJ.
- The soliton fiber laser demonstrated a maximum output power of 48.5 mW and a high slope efficiency of 12.8%.
Conclusions:
- HfSe2 NSs possess excellent nonlinear optical properties suitable for SA applications.
- The fabricated HfSe2 SA enables efficient generation of stable, ultrashort laser pulses.
- HfSe2 is a highly promising material for developing high-performance SAs in ultrafast photonics.
