Three optical cycle mid-IR Kerr-lens mode-locked polycrystalline Cr(2+):ZnS laser.
Three optical cycle mid-IR Kerr-lens mode-locked polycrystalline Cr(2+):ZnS laser.
复制标题
三光周期中红外克尔透镜锁模多晶 Cr(2 ):ZnS 激光器。
作者：
S. Vasilyev;I. Moskalev;M. Mirov;S. Mirov;V. Gapontsev
我们报告了克尔透镜锁模多晶 Cr(2+):ZnS 激光器，其中心波长为 2.4 μm，针对短脉冲持续时间进行了优化。通过控制 500 nm 带宽内的二阶和三阶色散，我们获得了 100 MHz 重复频率和 0.44 W 平均功率的三个光周期（<29 fs）的脉冲。发射光谱在 -3 dB 水平时宽 240 nm，在 -30 dB 水平时跨度 950 nm。在 300 MHz 重复频率和 700 mW 平均功率下获得变换限制的 38 fs 脉冲。据我们所知，这些是迄今为止报道的最短的 Cr(2+):ZnS 和 Cr(2+):ZnSe 激光器脉冲。
We report Kerr-lens mode-locked polycrystalline Cr(2+):ZnS lasers at 2.4 μm central wavelength optimized for short pulse duration. By control of the second- and third-order dispersion within 500 nm bandwidth we obtained pulses of three optical cycles (<29 fs) at 100 MHz repetition rate with 0.44 W average power. The emission spectrum is 240 nm broad at -3 dB level and spans 950 nm at -30 dB level. Transform-limited 38 fs pulses were obtained at 300 MHz repetition rate with 700 mW average power. To the best of our knowledge these are the shortest reported to-date pulses from Cr(2+):ZnS and Cr(2+):ZnSe lasers.