Self-cascaded noncritically-phase-matched KTP optical parametric oscillator for generating orthogonally polarized multi-wavelength emissions at 3 μm
Self-cascaded noncritically-phase-matched KTP optical parametric oscillator for generating orthogonally polarized multi-wavelength emissions at 3 μm
复制标题
自级联非临界相位匹配 KTP 光参量振荡器，用于生成 3 μm 正交偏振多波长发射
DOI：
10.1016/j.optlastec.2022.108536
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发表时间：
2022
影响因子：
5
通讯作者：
Chengjin Shi
中科院分区：
文献类型：
--
作者：
Yushuo Bao;Haitao Huang;Fei Wang;Chengjin Shi
·开发了中红外自级联非临界相位匹配KTP OPO，产生2950，3293和3367 nm的多个波长。·根据两种OPO工艺的偏振态，2950 nm具有与3293和3367 nm正交的偏振态。·得益于腔内OPO的强脉冲压缩效应，相应的中红外输出脉冲宽度小于10 ns，大大提高了脉冲的峰值功率。研制了中红外自级联非临界相位匹配（NCPM）KTP光参量振荡器（OPO），可产生2.95，3.29和3.37 μm的多个波长。2.95 μm的偏振态与其他两个波长的偏振态正交。在1064 nm腔内泵浦下，第一个NCPM KTP-OPO可以分别产生1.57 μ m和3.29 μm的信号光和闲频光。然后将1.57 μm的光作为泵浦光，在同一KTP中进行第二次NCPM OPO，产生2.95和3.37 μm的信号光和闲频光。在OPO腔镜之间建立了宽带光谱反馈条件，使两个NCPM OPO在同一个KTP和OPO腔中同时工作。对于2.95 μm，最大平均输出功率为1.18W，最小脉宽为5 ns，脉冲峰值功率为56.9kW，重复频率为4.2kHz。在3.29和3.37 μm双波长下，最大总平均输出功率为0.22W。为获得3 μm波段多波长正交偏振态激光输出提供了一种有效的方案。
• Mid-infrared self-cascaded noncritically-phase-matched KTP OPO was developed, generating multiple wavelengths at 2950, 3293 and 3367 nm. • According to the polarization state of two OPO processes, the 2950 nm has a polarization state orthogonal to that of the 3293 and 3367 nm. • Benefiting from the strong pulse compression effect of intracavity OPO, the corresponding mid-infrared output pulse widths are less than 10 ns, which greatly enhance the peak powers of the pulses. Mid-infrared self-cascaded noncritically-phase-matched (NCPM) KTP optical parametric oscillator (OPO) was developed, generating multiple wavelengths at 2.95, 3.29 and 3.37 μm. The polarization state of 2.95 μm is orthogonal to that of the other two wavelengths. Under 1064 nm intracavity pumping, the first NCPM KTP-OPO can generate signal and idler waves at 1.57 and 3.29 μm, respectively. Then the 1.57 μm is further used as pump light for the second NCPM OPO in the same KTP, generating signal and idler waves at 2.95 and 3.37 μm. Broadband spectral feedback condition is established between the OPO cavity mirrors, enabling the two NCPM OPOs to operate simultaneously in the same KTP and OPO resonator. With regard to 2.95 μm, the achieved maximum average output power and minimum pulse width are respectively 1.18 W and 5 ns, corresponding to a pulse peak power of 56.9 kW with 4.2 kHz repetition rate. As for the dual-wavelength at 3.29 and 3.37 μm, the maximum total average output power is 0.22 W. Our work provides an effective scheme to obtain multiple wavelength laser output in 3 μm region with orthogonal polarization state.