研究目的
To demonstrate and compare picoseconds pulsed fiber lasers based on Titanium dioxide based saturable absorbers (SAs) in the 1.5-micron region.
研究成果
The study successfully demonstrated and compared picoseconds pulsed fiber lasers based on Titanium dioxide-based SAs in the 1.5-micron region. Both TiO2DF and TiO2PF SAs produced stable pulsed lasers with comparable performances, with TiO2DF offering advantages in terms of thermal damage threshold, flexibility, and durability. These findings suggest that Titanium dioxide-based SAs are viable alternatives for pulse modulation in fiber lasers.
研究不足
The study is limited to the 1.5-micron region and focuses on the comparison between two types of Titanium dioxide-based SAs. The durability and thermal damage threshold of the SAs under prolonged operation were not extensively studied.
1：Experimental Design and Method Selection:
The study utilized a laser cavity with
2：4 m long Erbium-doped fiber (EDF) as the gain medium and incorporated Titanium dioxide-based saturable absorbers (SAs) for generating picoseconds pulsed lasers. Sample Selection and Data Sources:
Two types of SAs were used: 20 cm long Titanium dioxide-doped fiber (TiO2DF) and Titanium dioxide PVA film (TiO2PF).
3：List of Experimental Equipment and Materials:
Equipment included a 980 nm laser diode pump, wavelength division multiplexer (WDM), isolator, 3 dB couplers, digital oscilloscope (OSC), radio frequency spectrum analyzer (RFSA), optical spectrum analyzer (OSA), and optical power meter. Materials included EDF, TiO2DF, TiO2PF, and single-mode fiber (SMF28).
4：8). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser cavity was designed to ensure unidirectional light propagation, with the SAs acting as mode-lockers. The output was measured in time and frequency domains, and the laser spectrum was recorded.
5：Data Analysis Methods:
The performance of the pulsed lasers was analyzed based on output power, pulse energy, peak power, slope efficiency, and pulse width.
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Erbium-doped fiber
IsoGain, I-25
Fibercore
Gain medium in the laser cavity
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Single-mode fiber
SMF28
Provides sufficient intracavity nonlinear and dispersion in the cavity
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Titanium dioxide-doped fiber
Saturable absorber for generating mode-locked erbium doped fiber laser
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Titanium dioxide PVA film
Saturable absorber for generating mode-locked erbium doped fiber laser
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980 nm laser diode pump
Pump source for the laser cavity
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Wavelength division multiplexer
WDM
Multiplexes the pump light into the laser cavity
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Isolator
Ensures unidirectional light propagation in the cavity
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3 dB coupler
Splits the laser output into equal halves
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Digital oscilloscope
OSC
Measures the pulse in the time domain
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Radio frequency spectrum analyzer
RFSA
Measures the pulse in the frequency domain
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Optical spectrum analyzer
OSA
Records the output laser spectrum
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Optical power meter
Measures the output power
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