研究目的
To demonstrate an all fiber, passively Q-switched Thulium-doped fiber laser with a center operating wavelength at 1860 nm and 1930 nm, utilizing a Holmium-doped fiber as an amplified spontaneous emission filter and a molybdenum tungsten disulfide thin film as a passive optical modulator.
研究成果
The experimental results suggest the potential of a HDF as a method used to generate a passively Q-switched TDFL at the 1800 nm region. With proper amplification and optimization, the setup is capable to be applied for near-infrared application in particular for biomedical applications and polymer welding.
研究不足
The HDF-filter method introduces increased losses, resulting in a lower overall repetition rate, lower pulse energy, and a wider pulse width for the 1860 nm laser compared to the 1930 nm laser. The setup is optimized for lasing at the 2000 nm wavelength, causing significant loss when shifting the laser peak to the 1860 nm region.
1：Experimental Design and Method Selection:
A ring-type laser resonator is constructed to generate a two-micron laser using a Thulium-doped fiber gain medium. Passive Q-switching is achieved by integrating a MoWS2 saturable absorber within the cavity. The wavelength shift is induced by employing a Holmium-doped fiber based filter to suppress the TDF gain at > 1900 nm.
2：Sample Selection and Data Sources:
A four-meter-long TmDF200 OFS Thulium gain medium and a 1-meter long Holmium-doped fiber are used. The laser pump diode has a center wavelength of ~1550 nm with a maximum power of 228.5 mW.
3：5 mW.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: PSL-450 C-band laser diode, 1550/2000 WDM, 2000 nm isolator, MoWS2 thin film, 90/10 coupler, Yokogawa AQ6375 Optical Spectrum Analyzer, Thorlabs S302C Optical Power Meter, Yokogawa DLM205 oscilloscope, Newport 818-BB-51F photodetector, Anritsu MS2683A Radio-frequency Spectrum Analyzer.
4：Experimental Procedures and Operational Workflow:
The setup generates a two-micron laser, which is then shifted to a shorter wavelength by integrating a HDF into the cavity. The laser spectrum and pulse characteristics are analyzed using the specified equipment.
5：Data Analysis Methods:
The laser spectrum is analyzed using an optical spectrum analyzer, while the pulse characteristic is investigated using an oscilloscope and a photodetector. The frequency spectrum of the signal is analyzed using a radio-frequency spectrum analyzer.
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