研究目的
Investigating the use of molybdenum tungsten disulphide (MoWS2) as a saturable absorber for a passively Q-switched thulium/holmium-codoped fibre laser in the 2.0 μm region.
研究成果
The MoWS2 based SA successfully generates Q-switched pulses in a THDF laser cavity, demonstrating its potential as an optical modulator for the near-infrared 2.0 μm region applications, particularly in medical and sensing applications.
研究不足
The SA exceeds its saturation point and bleaches beyond a pump power of 510.4 mW, thus not being able to provide further saturable absorption behaviour. This limit can be improved by manipulating the thickness of the MoWS2 film.
1：Experimental Design and Method Selection:
The MoWS2 nanosheets are prepared by hydrothermal exfoliation and suspended in a PVA thin film host. The Q-switched THDFL is constructed following a ring cavity architecture.
2：Sample Selection and Data Sources:
A 4-m-long TH512 Coractive THDF is used as the gain medium. A C-band Tunable Laser Source is used as a pump source.
3：List of Experimental Equipment and Materials:
Includes a Keopsys Erbium-doped Fibre Amplifier, a 1550/2050 nm wavelength-division multiplexer, a 2050 nm isolator, and a MoWS2 based SA.
4：Experimental Procedures and Operational Workflow:
The pump signal is integrated into the laser cavity through the 1550 nm port of a WDM. The output is analyzed using an oscilloscope, a photodetector, a radio-frequency spectrum analyzer, an optical spectrum analyzer, and an optical power meter.
5：Data Analysis Methods:
The relationship between the pump power and the repetition rate and pulse width is monitored. The pulse energy and peak power are determined by taking the values of the average output power, repetition rate, and pulse width.
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Yokogawa DLM205 oscilloscope
DLM205
Yokogawa
Analysis of the extracted lasing signal
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Anritsu MS2683A Radio-frequency Spectrum Analyzer
MS2683A
Anritsu
Study of the frequency spectrum of the pulse
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Yokogawa AQ6375 Optical Spectrum Analyzer
AQ6375
Yokogawa
Measurement of the optical spectrum of the laser
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Thorlabs S302C Optical Power Meter
S302C
Thorlabs
Measurement of the average output power
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Santec WSL-100 Tunable Laser Source
WSL-100
Santec
Pump source
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TH512 Coractive THDF
Coractive
Gain medium for emission in the two-micron region
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Keopsys CEFA Erbium-doped Fibre Amplifier
CEFA
Keopsys
Amplification of the seed output
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1550/2050 nm wavelength-division multiplexer
Integration of the pump signal into the laser cavity
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2050 nm isolator
Rectification of the lasing direction
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Newport 818-BB-51F photodetector
818-BB-51F
Newport
Optical-to-electrical signal conversion
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