研究目的
To demonstrate a dual-wavelength mid-infrared optical parametric oscillator pumped by two independent fiber lasers, achieving phase-matched signal beam coupling and observing phenomena like threshold reduction and parametric gain enhancement.
研究成果
The study successfully demonstrated a dual-wavelength mid-infrared OPO with significant threshold reduction and parametric gain enhancement due to signal beam coupling. This method improves conversion efficiency and has practical applications in frequency down-conversion of low-power near-infrared sources, suggesting potential for future optimizations and broader implementations.
研究不足
The wavemeter used for idler spectrum measurement was not accurate in intensity representation, potentially affecting power comparisons. The experiment was limited to specific pump wavelengths and crystal parameters, and further optimization with dichroic mirrors for power separation is needed.
1：Experimental Design and Method Selection:
The experiment involved designing a dual-wavelength OPO pumped by two independent CW fiber lasers at 1018 nm and 1080 nm, using a PPLN crystal with a fan-out grating period to achieve phase-matching and signal beam coupling. The OPO was configured as a four-mirror ring cavity for singly resonant oscillation.
2：Sample Selection and Data Sources:
A MgO:PPLN crystal with dimensions 50x10x1 mm3 and a fan-out grating period was used. Pump sources were home-made Yb-doped fiber lasers.
3：List of Experimental Equipment and Materials:
Equipment included fiber lasers, wavelength division multiplexer (WDM), focusing lens, mirrors (M1, M2, M3, M4), PPLN crystal, collimating lens, dichroic mirrors (M5, M6), and a wavemeter for spectral measurements.
4：Experimental Procedures and Operational Workflow:
The two pump lasers were combined using a WDM, focused into the PPLN crystal, and the grating period was tuned to achieve signal beam coupling. Output powers and spectra of signal and idler beams were measured under various pump conditions.
5：Data Analysis Methods:
Data were analyzed by measuring output powers and spectra, calculating slope efficiencies, and comparing with simulated tuning curves based on Sellmeier equations.
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