Abstract
Single-frequency lasers are essential for high-resolution spectroscopy and sensing applications as they combine high-frequency stability with low noise and high output power stability. For many of these applications, there is increasing interest in power-scaling single-frequency sources, both in the near-infrared and visible spectral range. We report the second-harmonic generation of 670 µJ at 532 nm of a single-frequency fiber amplifier signal operating in the quasi-continuous-wave mode in a 10-mm periodically poled Mg-doped lithium niobate (MgO:PPLN) crystal, while increasing compactness. To the best of our knowledge, this is the highest pulse energy generated in this crystal, which may find applications in the visible and UV such as remote Raman spectroscopy.
Highlights
High-power single-frequency laser systems have become increasingly attractive thanks to their high spatial and temporal coherence, which has enabled technological advances in many applications such as high-resolution spectroscopy, remote sensing, non-linear frequency conversion, and holography
In light of the foregoing, here we investigate the frequency doubling of a QCW singlefrequency fiber amplifier in a 10-mm Mg-doped lithium niobate (MgO):PPLN crystal
For single-pass external cavity nonlinear frequency conversion, we evaluated the performance of a 10-mm periodically poled MgO-doped LiNbO3 (MgO:PPLN) crystal (Covesion, Southampton, UK) that was kept at constant temperature in a temperaturecontrolled oven
Summary
High-power single-frequency laser systems have become increasingly attractive thanks to their high spatial and temporal coherence, which has enabled technological advances in many applications such as high-resolution spectroscopy, remote sensing, non-linear frequency conversion, and holography. The. Raman signal strength (intensity) is directly proportional to the power of the laser used to excite the sample, and inversely proportional to the laser wavelength [4]. Raman signal strength (intensity) is directly proportional to the power of the laser used to excite the sample, and inversely proportional to the laser wavelength [4] In this regard, diode-pumped solid-state lasers are desirable laser sources, as they offer low noise, good power stability, and good beam pointing stability. Power scaling of single-frequency laser sources at 532 nm is, very attractive It can be achieved by power scaling the signal at 1064 nm and/or increasing the efficiency of second-harmonic generation
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