研究目的
To develop a tunable millijoule-level 3-μm vortex laser source for applications in environmental optics, medical therapy, and organic materials processing.
研究成果
A tunable millijoule-level 3-μm vortex source was successfully developed, with the maximum vortex output energy of 2.14 mJ and an optical conversion efficiency of 10.2%. The handedness of the vortex output was controlled by inverting the handedness of the pump vortex beam.
研究不足
The wavelength tuning range was limited by the temperature dispersion and the grating period of the PPLN crystal. The spatial intensity profile of the pump beam caused a slightly asymmetric intensity profile in the generated vortex beam.
1：Experimental Design and Method Selection:
A tunable 3-μm vortex laser was developed using a 1-μm vortex pulse-pumped MgO:PPLN optical parametric oscillator with a singly resonant plane-parallel cavity configuration.
2：Sample Selection and Data Sources:
A 5 mol % MgO-doped PPLN crystal with dimensions 40 × 4 × 2 mm3 and a grating period of 30 μm was used.
3：List of Experimental Equipment and Materials:
A conventional flash-lamped Q-switched Nd:YAG laser, a spiral phase plate, a MgO:PPLN crystal, and a pyroelectric camera were used.
4：Experimental Procedures and Operational Workflow:
The optical vortex pump beam was focused and directed toward the OPO. The crystal temperature was controlled to tune the wavelength.
5：Data Analysis Methods:
The spatial profile and wavefront of the idler output were observed using a pyroelectric camera.
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