研究目的
Investigating the effectiveness of chemically synthesized tellurium nanocrystals (Chem-Te) thin film as a saturable absorber (SA) for stable mode-locking in an all-fiber structured thulium-doped laser cavity.
研究成果
The experimental results show that the few-layered Chem-Te has great potential in the realization of the stable high-power mode-locking in 2 μm-band high-power laser system.
研究不足
The insertion loss of the SA is nearly 2.73 dB, so the output laser power is relatively low. The mode-locking phenomena were disappeared when the pump power was adjusted to higher than 1070 mW.
1：Experimental Design and Method Selection:
The study involved the development of a Chem-Te thin film by liquid phase peeling technique and its integration into an all-fiber structured thulium-doped laser cavity for mode-locking.
2：Sample Selection and Data Sources:
The Chem-Te powder was provided by the Department of Electronic Engineering, Shanghai Jiao Tong University.
3：List of Experimental Equipment and Materials:
A commercialized continuous-wave laser (MLFS-1570-B-2 W), a filtered wavelength division multiplexer (FWDM), a piece of 18 cm-long single-mode thulium-doped fiber (SM-TDF), and a Chem-Te saturable absorber.
4：Experimental Procedures and Operational Workflow:
The Chem-Te was sandwiched between the end-facet of two fiber connectors to ensure a well-transmittance and compact structure of the ring cavity. The output spectrum was monitored by an optical spectrum analyzer (OSA, Yokogawa, AQ6375).
5：5). Data Analysis Methods:
5. Data Analysis Methods: The output pulsed laser RF was measured by a 500 MHz signal oscilloscope (MSO, Yokogawa, DLM2054), and the auto-correlation trace and the pulses train of the mode-locked pulse were detected by an autocorrelator (FR-103XL) and a radio-frequency spectral analyzer (Rigol, DSA875), respectively.
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optical spectrum analyzer
AQ6375
Yokogawa
To monitor the output spectrum.
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signal oscilloscope
DLM2054
Yokogawa
To measure the output pulsed laser RF.
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continuous-wave laser
MLFS-1570-B-2 W
Used as the oscillator pump source.
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filtered wavelength division multiplexer
FWDM
To deliver forward pumping light to gain fiber.
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single-mode thulium-doped fiber
SM-TDF
Nufern Inc.
Used as the gain medium.
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autocorrelator
FR-103XL
To detect the auto-correlation trace of the mode-locked pulse.
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radio-frequency spectral analyzer
DSA875
Rigol
To detect the pulses train of the mode-locked pulse.
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