研究目的
To demonstrate a high energy pulse laser at 2 μm by employing a normal dispersion fiber attained by a waveguide dispersion engineering, enabling pulse energy scaling in a compact and robust all-fiber architecture.
研究成果
The developed normal dispersion Tm fiber served as a gain medium for both oscillator and amplifier, enabling mode-locked soliton pulses near 2 μm to be amplified to a record high pulse energy of ~525 nJ without pulse breaking. This represents a significant advancement for mode-locked pulse energy scaling at 2 μm wavelength in all-fiber configurations.
研究不足
The study is limited by the fabrication tolerance of the W-type index profile, which may affect the dispersion properties of the fiber. Additionally, the splicing loss between dissimilar fibers could impact the overall efficiency of the laser system.
1：Experimental Design and Method Selection:
The study employs a W-type refractive index profile for the Thulium-doped fiber (TDF) to achieve normal dispersion at the Tm emission band. The design allows strong waveguide dispersion, contrasting with the anomalous dispersion in step-index fibers.
2：Sample Selection and Data Sources:
The TDF with a W-type index profile was fabricated using a conventional MCVD process in conjunction with a solution doping method. The fibers were characterized for their dispersion properties and absorption rates.
3：List of Experimental Equipment and Materials:
A ring fiber laser oscillator and an all-fiber amplifier were constructed using the NDTF. Equipment includes a 1565 nm single mode laser as a pump source, a saturable absorber for mode-locking, and an optical spectrum analyzer (OSA) for spectrum measurement.
4：Experimental Procedures and Operational Workflow:
The NDTF was deployed in a ring cavity to produce mode-locked pulses near 2 μm. The pulse was then amplified through the NDTF, with the output pulse energy and spectrum measured.
5：Data Analysis Methods:
The dispersion properties of the fibers were calculated and measured using an interferometric phase method. The output pulse characteristics were analyzed using an oscilloscope and an OSA.
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