Efficient Ultrafast Frequency Conversion Sources for the Visible and Ultraviolet Based on BiB $_{3}$ O $_{6}$
Efficient Ultrafast Frequency Conversion Sources for the Visible and Ultraviolet Based on BiB $_{3}$ O $_{6}$
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DOI：
10.1109/jstqe.2007.897417
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发表时间：
2007-06
影响因子：
4.9
通讯作者：
M. Ebrahim-Zadeh
中科院分区：
文献类型：
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作者：
M. Ebrahim-Zadeh
在非线性光学晶体BiB 3 O 6（BIBO）中实现了高重复率飞秒和皮秒脉冲的高效频率转换，并在可见光、蓝光和紫外光范围内实现了宽调谐。利用克尔透镜锁模钛宝石激光器直接单程二次谐波产生，在近紫外和蓝光光谱范围内，平均输出功率接近1 W，转换效率超过50%，光谱覆盖范围为370-450 nm。在重复频率为76 MHz时，获得了脉宽为220 fs和2.8ps的激光输出。通过实现基于BIBO的同步泵浦飞秒光参量振荡器（OPO），产生的光谱范围进一步扩展到覆盖整个可见光谱，跨越绿-黄-橙-红区域。在480-710 nm范围内产生了重复频率为76 MHz、脉冲宽度为120 fs的平均输出功率高达270 mW。在β-BaB 2 O 4晶体中可见光OPO信号脉冲的内部倍频已经允许在高达100 mW的平均功率下在UV中在250-350 nm范围内具有宽可调谐性的高重复率飞秒脉冲产生。BIBO的高强度脉冲的有效频率转换的潜力也表明通过放大微焦耳皮秒脉冲在1064 nm的三次谐波产生。在355 nm处获得了重复频率为25 Hz、脉宽为29 ps、能量为216 μ J的激光输出，转换效率高达50%。
Efficient frequency conversion of high-repetition-rate femtosecond and picosecond pulses with wide tunability throughout the visible, blue, and UV is demonstrated in the nonlinear optical crystal BiB3O6 (BIBO). Using direct single-pass second harmonic generation of Kerr-lens-mode-locked Ti:sapphire laser, average output powers close to 1 W at conversion efficiencies in excess of 50% are demonstrated with broad spectral coverage across 370-450 nm in the near-UV and blue spectral range. Output pulse durations of 220 fs and 2.8 ps have been obtained at a pulse repetition rate of 76 MHz. By implementing a synchronously pumped femtosecond optical parametric oscillator (OPO) based on BIBO, the generated spectral range is further extended to cover the entire visible spectrum, across the green-yellow-orange-red regions. Average output powers of up to 270 mW in pulses of 120 fs at 76 MHz repetition rate have been generated across the 480-710 nm range. Internal frequency doubling of the visible OPO signal pulses in the crystal of beta-BaB2O4 has permitted high-repetition-rate femtosecond pulse generation with wide tunability across 250-350 nm in the UV at up to 100 mW of average power. The potential of BIBO for efficient frequency conversion of high-intensity pulses is also demonstrated through third harmonic generation of amplified microjoule picosecond pulses at 1064 nm. Output pulse energies of 216 muJ in 29 ps duration at 25 Hz repetition rate have been obtained at 355 nm with overall conversion efficiencies of up to 50%.