Abstract
This work reports for the first time on study of a single-frequency Nd:YVO4 laser with intra-cavity frequency doubling, in which quasi-continuous frequency tuning over an ultra-broad range is implemented with two intra-cavity locked etalons and automatic stitching between ranges of smooth scanning of the laser's output frequency. The proposed and demonstrated method allowed to continuously tune the output frequency of the studied 1.5-W Nd:YVO4/LBO laser over a record-breaking broad range of 240 GHz at 532 nm.
Highlights
Single-frequency ring Nd:YVO4 lasers with intra-cavity frequency doubling by nonlinear crystals (NC) are widely used in a variety of applications requiring powerful and stable green radiation with long coherence length
This work reports for the first time on study of a singlefrequency Nd:YVO4 laser with intra-cavity frequency doubling, in which quasi-continuous frequency tuning over an ultra-broad range is implemented with two intra-cavity locked etalons and automatic stitching between ranges of smooth scanning of the laser’s output frequency
This algorithm will be useful in tuneable single-frequency lasers with intra-cavity SHG, in which the two-etalon smooth frequency tuning range is limited to around 0.5–1 nm by a coarser wavelength selector, such as a birefringent filter [17]
Summary
Single-frequency ring Nd:YVO4 lasers with intra-cavity frequency doubling by nonlinear crystals (NC) are widely used in a variety of applications requiring powerful and stable green radiation with long coherence length. In order to sweep the output frequency of an Nd:YVO4 laser over the entire gain band (257 GHz) using a single solid quartz etalon, the thickness of this etalon cannot exceed 0.4 mm The finesse of such an etalon corresponding to spectral selectivity sufficient for reliable isolation of a single axial mode should be relatively high (in [6], reflectivity of the etalon sides was 60%). The thicker etalon ensures reliable selection of a single axial mode, while the thinner one provides an FSR exceeding the required frequency tuning range of the laser output It is this method that the authors implemented in the present work. Demonstrated for the first time is the possibility of continuous frequency tuning of the second harmonic of an Nd:YVO4/LBO laser at 532 nm delivering 1.5 W of output power across a record-breaking wide spectral range of 240 GHz
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