研究目的
Investigating the dual-wavelength operation of Yb:YAP laser with an intracavity birefringent filter (BRF) for potential applications in THz imaging and spectroscopy.
研究成果
DW operation of Yb:YAP laser using a 1 mm-thick BRF was demonstrated, showing that DW oscillation with wavelength separation far smaller than the FSR of the filter was possible. This method can be applied to other lasers with broad gain bandwidth, and the DWs can be used to generate THz radiation via photomixing.
研究不足
The wavelength separation in DW operation is limited by the gain balancing provided by a single transmission peak of the filter, and the method's applicability to other lasers with broad gain bandwidth needs further investigation.
1：Experimental Design and Method Selection:
A four-mirror cavity configuration was used with a 3 mm-long a-cut (5 at%) Yb:YAP crystal. The laser was pumped by a fiber-coupled laser diode at 979 nm, and a 5% output coupler was used in the cavity. A 1 mm-thick BRF with on-surface optical axis was placed at the Brewster’s angle near the output coupler to operate the laser in DW regime.
2：Sample Selection and Data Sources:
The laser wavelength could be tuned by rotating the BRF, and a combination of single and dual-wavelength oscillation regimes were observed.
3：List of Experimental Equipment and Materials:
Yb:YAP crystal, fiber-coupled laser diode, output coupler, birefringent filter (BRF).
4：Experimental Procedures and Operational Workflow:
The BRF was rotated to tune the laser wavelength, observing single and dual-wavelength oscillation regimes. The laser was tunable from 1014 nm up to 1060 nm.
5：Data Analysis Methods:
The full width at half-maximum of a single transmission peak of the filter was calculated to vary between 5.2-7.7 nm over the full range of rotation angle of the filter.
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