研究目的
Investigating the generation of a supercontinuum (SC) source with pump power independent spectral distribution by directly pumping dissipative soliton resonance (DSR) pulses with kW-level peak power into photonics crystal fiber (PCF).
研究成果
The study successfully demonstrates an all-fiber SC source with a pump power independent spectral distribution by directly pumping kW-level peak power DSR pulses into PCF. The SC spans from 450 to 2250 nm and maintains its spectral distribution while increasing in intensity with output power from 0.65 to 1.74 W.
研究不足
The spectral distribution of the generated SC is nearly invariable with increasing output power, but there are dips in the spectrum around 1400 nm and 1900 nm due to the absorption of water vapor.
1：Experimental Design and Method Selection:
The study involves constructing a DSR laser source with all 10 μm-core-diameter large-mode-area fiber as a pump source to produce up to 1 kW peak power DSR pulses. A nonlinear optical loop mirror (NOLM) is used for tuning the pulse duration. The SC is generated by pumping these pulses into a 40 m-length PCF.
2：Sample Selection and Data Sources:
The experiment uses a piece of 1.6 m ytterbium-doped fiber (YDF) cladding-pumped by a laser diode (LD) and a 40 m long PCF with a zero-dispersion wavelength around 1012 nm.
3：6 m ytterbium-doped fiber (YDF) cladding-pumped by a laser diode (LD) and a 40 m long PCF with a zero-dispersion wavelength around 1012 nm. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a laser diode (LD), ytterbium-doped fiber (YDF), polarization independent isolator, fiber couplers (OC1, OC2), polarization controller (PC), band-pass filter (BPF), single mode fiber (SMF), mode field adaptor (MFA), and photonics crystal fiber (PCF).
4：Experimental Procedures and Operational Workflow:
The setup involves pumping the YDF with the LD, using a NOLM for mode-locking, and then injecting the DSR pulses into the PCF via an MFA to generate SC.
5：Data Analysis Methods:
The characteristics of the DSR laser and the generated SC are analyzed using optical spectrum analyzers and oscilloscope traces.
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laser diode
Pumping the ytterbium-doped fiber (YDF)
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ytterbium-doped fiber
Used as the gain medium in the laser setup
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polarization independent isolator
Ensures unidirectional propagation of light
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fiber coupler
OC1, OC2
Connects different parts of the optical setup and extracts energy out of the cavity
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polarization controller
PC
Helps to achieve the mode-locking state
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band-pass filter
BPF
Imposes spectrum loss and selects the pulse central wavelength
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single mode fiber
SMF
Used in the optical setup for light transmission
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mode field adaptor
MFA
Converts fiber in 10μm-core-diameter to 6μm-core-diameter to reduce inserting loss and increase efficiency
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photonics crystal fiber
PCF
Used for nonlinear spectral broadening to generate supercontinuum
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