Dabu R
National Institute for Laser, Plasma and Radiation Physics, Atomistilor Str. 409, 077125 Bucharest, Romania.
Opt Express. 2010 May 24;18(11):11689-99. doi: 10.1364/OE.18.011689.
Gain spectra were calculated at critical wavelength degeneracy (CWD) in a collinear phase-matching geometry optical parametric amplification (OPA) process. The frequency bandwidth available through CWD-OPA is broader compared to the gain bandwidth obtained by the non-collinear OPA geometry. A solution for very broad bandwidth chirped pulse amplification based on partially deuterated DKDP (P-DKDP) crystals, pumped by pulsed green lasers, is proposed. 1.38x10(14) Hz frequency bandwidth and peak intensity gain G approximately 62 were calculated in a 5-mm long 58% deuterated DKDP crystal, pumped by 527-nm wavelength at 64-GW/cm2 intensity. Parametric amplification at CWD in few-mm thin P-DKDP crystals, pumped by picosecond pulses of nearly 100-GW/cm2 intensity, possesses a true potential for generating high energy laser pulses compressible to one-cycle duration.
在共线相位匹配几何结构的光学参量放大（OPA）过程中，在临界波长简并（CWD）条件下计算了增益谱。与非共线OPA几何结构获得的增益带宽相比，通过CWD-OPA可获得的频率带宽更宽。提出了一种基于部分氘化DKDP（P-DKDP）晶体、由脉冲绿光激光器泵浦的极宽带宽啁啾脉冲放大解决方案。在一块5毫米长、氘化率为58%的DKDP晶体中，由波长527纳米、强度64吉瓦/平方厘米的光泵浦，计算得到频率带宽为1.38×10¹⁴赫兹，峰值强度增益G约为62。由强度近100吉瓦/平方厘米的皮秒脉冲泵浦的几毫米厚的薄P-DKDP晶体在CWD条件下的参量放大，具有产生可压缩到单周期持续时间的高能量激光脉冲的真正潜力。
