We study ${\rm{Yb}}{:}{{\rm{Ca}}_3}{{\rm{NbGa}}_3}{{\rm{Si}}_2}{{\rm{O}}_{14}}$ (Yb:CNGS) lasers in the mode-locked regime, focusing on their self-frequency-doubling potential. We characterize the laser performance in configurations without and with phase-matching for second-harmonic generation. In the former case, the laser generates 47 fs pulses at a central wavelength of 1052 nm with an average output power of 45 mW at 78.4 MHz. These pulses are further compressed extracavity down to 40 fs, which indicates that the employed crystal is one of the most promising novel gain media regarding ultrafast laser operation. Furthermore, we demonstrate that in a configuration close to phase-matching, the laser emits 40 mW of fundamental radiation at 1046 nm with 100 fs pulse duration simultaneously producing 66 mW of second-harmonic centered at 525 nm. In order to better describe the self-frequency-doubling phenomenon, we compare our experimental observations obtained in both configurations with results of numerical modeling.

中文翻译：

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飞秒方式工作的自倍频Yb：CNGS激光器

我们研究$ {\ rm {Yb}} {：} {{\ rm {Ca}} _ 3} {{\ rm {NbGa}} _ 3} {{\ rm {Si}} _ 2} {{\ rm {O} } _ {14}} $（Yb：CNGS）激光器处于锁模状态，专注于其自倍频潜力。我们在不具有和具有二次谐波产生相位匹配的配置中表征激光器的性能。在前一种情况下，激光器在1052 nm的中心波长处产生47 fs脉冲，在78.4 MHz处的平均输出功率为45 mW。这些脉冲被进一步压缩到40fs的腔外，这表明所采用的晶体是有关超快激光操作的最有希望的新型增益介质之一。此外，我们证明，在接近相位匹配的配置中，激光在1046 nm处发射40 mW的基本辐射，脉冲持续时间为100 fs，同时产生以525 nm为中心的66 mW的二次谐波。为了更好地描述自倍频现象，