Shehata Abdullah, Chvykov Vladimir, Schuch Reinhold, Mohamed Tarek
Appl Opt. 2018 Feb 10;57(5):1212-1217. doi: 10.1364/AO.57.001212.
An optical trap for storing femtosecond laser pulses to enhance the interaction effectiveness with optically thin targets is being proposed and investigated. Presently, we studied the trapping of 10-200 fs laser pulses of wavelength 800 nm, 1 μJ energy per pulse, and 10 Hz repetition rate. To compensate the optical losses in the trap, a Ti: Sapphire crystal as an amplifying medium is being considered, which should be synchronously pumped by the second harmonic of the Nd: YAG laser. Due to the propagation of the short pulses through optical trap components, group velocity dispersion introduces a significant broadening in pulse duration. To compensate for this broadening, a chirped mirror with suitable parameters is being proposed. An increase of the average power of the laser pulse in the optical trap that includes an amplifying medium (Ti: Sapphire crystal) by a factor of 805 compared to a single passage of the laser pulse was derived. It should be possible to store the laser pulse in the optical trap for >4 μs with constant power and with a repetition rate of up to 250 MHz.
正在提出并研究一种用于存储飞秒激光脉冲以提高与光学薄靶相互作用效率的光阱。目前，我们研究了波长为800 nm、每脉冲能量为1 μJ、重复频率为10 Hz的10 - 200 fs激光脉冲的捕获。为了补偿光阱中的光学损耗，正在考虑使用钛宝石晶体作为放大介质，它应由Nd:YAG激光的二次谐波进行同步泵浦。由于短脉冲在光阱组件中的传播，群速度色散会导致脉冲持续时间显著展宽。为了补偿这种展宽，正在提出一种具有合适参数的啁啾镜。结果表明，与激光脉冲单次通过相比，包含放大介质（钛宝石晶体）的光阱中激光脉冲的平均功率提高了805倍。应该能够将激光脉冲以恒定功率存储在光阱中超过4 μs，重复频率高达250 MHz。
