Kitajima Shotaro, Nishizawa Norihiko
Opt Express. 2025 Mar 24;33(6):13101-13110. doi: 10.1364/OE.554621.
The Yb:KREW (Yb:KRE(WO), where RE = Y, Gd, Lu) crystal family is an excellent laser medium for ultrashort pulse lasers due to its broad bandwidth and high gain. However, it is a highly anisotropic and biaxial medium, making its use as a thin-disk laser challenging. In this study, to the best of our knowledge, we demonstrate the first Kerr-lens mode-locked thin-disk laser based on Yb:KLuW, utilizing a sufficiently thin gain medium and low thermal resistance bonding. This configuration achieved a pulse duration of 48.0 fs, a spectral width of 24.1 nm at center wavelength of 1026.0 nm, and an average output power of 0.425 W. Additionally, 3.3 W of output power with 59.8 fs pulses were obtained by adjusting the output coupling ratio. Furthermore, multimode CW operation yielded 138 W of output power with a 62% slope efficiency.
镱钾钨酸盐（Yb:KREW，其中RE = Y、Gd、Lu）晶体家族由于其宽带宽和高增益，是用于超短脉冲激光器的优秀激光介质。然而，它是一种高度各向异性的双轴介质，这使得将其用作薄片激光器具有挑战性。在本研究中，据我们所知，我们展示了基于Yb:KLuW的第一台克尔透镜锁模薄片激光器，采用了足够薄的增益介质和低热阻键合。这种配置实现了48.0 fs的脉冲持续时间、在1026.0 nm中心波长处24.1 nm的光谱宽度以及0.425 W的平均输出功率。此外，通过调整输出耦合比获得了3.3 W的输出功率，脉冲宽度为59.8 fs。此外，多模连续波运行产生了138 W的输出功率，斜率效率为62%。
