研究目的
Investigating the generation of few-cycle mid-infrared (MIR) pulses from a self-compressed optical parametric oscillator (OPO) pumped by a femtosecond fiber laser system.
研究成果
The self-compression OPO successfully generated 4.2-cycle MIR pulses at 3250 nm with a broadband spectrum and high output power. The system's simplicity and robustness make it suitable for applications requiring few-cycle pulses in the MIR region.
研究不足
The system's output power and pulse duration are limited by the high order dispersion induced by the dielectric mirrors and the potential damage to the PPLN crystal at higher pump powers.
1：Experimental Design and Method Selection:
A ring cavity design was used to generate few-cycle MIR pulses. The OPO was synchronously pumped by a 105 fs Yb3+ doped fiber laser system.
2：Sample Selection and Data Sources:
A 5 mm long MgO:PPLN crystal with poling periods ranging from
3：5 μm to 5 μm was used as the nonlinear medium. List of Experimental Equipment and Materials:
The setup included mirrors, a half wave plate, a polarization beam splitter cube, and a beam splitter for signal output.
4：Experimental Procedures and Operational Workflow:
The OPO cavity was designed with four plane mirrors and two concave mirrors to achieve a beam waist radius of 80 μm inside the nonlinear crystal.
5：Data Analysis Methods:
The idler pulse duration was measured by a home-made interferometric auto-correlator based on two-photon absorption in an InGaAs photodetector.
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