研究目的
Investigating the dissipative soliton resonance (DSR) operation in a passively mode-locked praseodymium-doped fluoride fiber laser with a nonlinear optical loop mirror.
研究成果
A DSR in a passively mode-locked PDFF laser with an integrated NOLM is demonstrated in the 1.3 μm wavelength region. A stable square pulse emission operating at centre wavelength of 1303 nm is observed. The width of the square pulse broadens up to 239 ns at the maximum pump power of 594 mW, whereas the peak power remained at a comparable level throughout the operating pump power. The highest single pulse energy is measured to be as large as 2.3 nJ, without any pulse breaking observed. With the aid of amplifier, the DSR laser would have multiple applications for operation in zero-dispersion region, 1.3 μm.
研究不足
The low output power of the laser is attributed to the low radiative quantum efficiency of the 1G4 state in fluoride-based glass caused by the multi-phonon relaxation process. The need for high pump powers to maintain the population inversion at 1G4 excited state and the re-absorption of the 1.3 μm signal through the signal ESA thus leads to the lower optical efficiency of the laser.
1：Experimental Design and Method Selection
The cavity configuration of the PDFF laser is illustrated with the NOLM technique adopted for achieving the mode-locking operation. A 95/5 optical coupler is utilized to join the NOLM and the unidirectional loop.
2：Sample Selection and Data Sources
A praseodymium-doped fluoride fiber is employed as the gain medium to allow lasing in the 1.3 μm region.
3：List of Experimental Equipment and Materials
1020 nm laser diode (LD), a 1020/1300 wavelength division multiplexer (WDM), a 11.7 m long PDFF, an isolator (ISO), 80/20 optical coupler (OC2), Yokogawa AQ6370B optical spectrum analyser (OSA), Newport 818-BB-35F 12.5 GHz photodetector, Yokogawa DLM2054 oscilloscope (OSC), Anritsu MS2683A RF spectrum analyser (RFSA).
4：Experimental Procedures and Operational Workflow
With fine adjustment of the intra-cavity polarization state in the laser cavity using the PC, the distinctive DSR square pulse is observable from a threshold pump power of 491 mW to the maximum pump power of 594 mW.
5：Data Analysis Methods
The optical spectrum of the DSR output is analysed with a Yokogawa AQ6370B optical spectrum analyser (OSA). The square pulse train and the radio-frequency (RF) spectrum are detected by a Newport 818-BB-35F 12.5 GHz photodetector, together with a 500 MHz Yokogawa DLM2054 oscilloscope (OSC) and a 9 kHz–7.8 GHz Anritsu MS2683A RF spectrum analyser (RFSA) respectively.
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RF spectrum analyser
MS2683A
Anritsu
Used together with the photodetector for detecting the radio-frequency (RF) spectrum.
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praseodymium-doped fluoride fiber
11.7 m long
Fiberlabs Inc.
Gain medium to allow lasing in the 1.3 μm region.
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optical spectrum analyser
AQ6370B
Yokogawa
Analyses the optical spectrum of the DSR output.
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oscilloscope
DLM2054
Yokogawa
Used together with the photodetector for detecting the square pulse train.
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laser diode
1020 nm
Not specified
Optically pumps the praseodymium-doped fluoride fiber.
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wavelength division multiplexer
1020/1300
Not specified
Joins the laser diode and the praseodymium-doped fluoride fiber.
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isolator
Not specified
Not specified
Enforces unidirectional laser operation.
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optical coupler
80/20
Not specified
Extracts the propagating signal for further analysis.
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photodetector
818-BB-35F
Newport
Detects the square pulse train and the radio-frequency (RF) spectrum.
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