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Mid-IR spectral comb with broad instantaneous bandwidth usingsubharmonic OPO

机译：使用次谐波OPO具有宽瞬时带宽的中红外频谱梳

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We implement a new approach for generating broadband mid-infrared frequency combs via degenerate optical parametric oscillation. This technique efficiently transfers the desirable properties of shorter wavelength mode-locked sources to the mid-IR. Our OPO resonator is a 3m ring cavity composed of one pair of concave mirrors with R=50mm and four flat mirrors, all but one of which are gold coated with > 99% reflection. A single dielectric mirror is used to introduce the 1560nm pump (Menlo Systems C-fiber, 100 MHz, 70 fs, 350 mW or Toptica Photonics FemtoFiber Pro, 80 MHz, 85 fs, 380 mW). The dielectric mirror is transmissive for the pump and reflective in the 2.5- 4 micron range. Broadband parametric gain around 3.1-micron subharmonic is provided by short (0.2-0.5mm) periodically poled lithium niobate (MgO:PPLN) at Brewster angle. Crystals were cut from Crystal Technology Inc. material having QPM period of 34.8 microns for type 0 (e=e+e) phase matching at t=32 deg. C. The enormous acceptance bandwidth at degeneracy, typical for OPOs with type 0 (or type I) phase-matching, gives broad bandwidth and makes temperature tuning insignificant. Broadband oscillation is achieved when signal/idler are brought into degenerate resonance by fine-tuning the cavity length with a mirror on a piezo stage. Using an 8% reflective pellicle, we outcouple a frequency comb of more than l000nm bandwidth, centered around 3.1 microns. A lmm or 2.5mm thick ZnSe plate at Brewster angle provides 2nd-order group velocity dispersion compensation, improving the OPO bandwidth. The OPO threshold was measured to be < 30mW. When locked, the OPO outputs 60 mW of average power centered at 3.1 microns. With proper intracavity dispersion management including chirped mirrors, we expect to extend the spectral width to an octave or more.
机译：我们采用一种新的方法，通过简并的光学参量振荡来生成宽带中红外频率梳。该技术有效地将较短波长锁模光源的理想特性传递给中红外。我们的OPO谐振器是一个3m环形腔，由一对R = 50mm的凹面镜和四个平面镜组成，除一个平面镜外，其他所有镜面均镀金，反射率大于99％。单个介电镜用于引入1560nm泵浦（Menlo Systems C光纤，100 MHz，70 fs，350 mW或Toptica Photonics FemtoFiber Pro，80 MHz，85 fs，380 mW）。介电镜对于泵是透射的，并且在2.5-4微米范围内反射。在布鲁斯特角，短周期极化的铌酸锂（MgO：PPLN）（0.2-0.5mm）可提供约3.1微米亚谐波的宽带参数增益。从具有34.8微米QPM周期的Crystal Technology Inc.材料中切出晶体，以在t = 32度时进行0型（e = e + e）相匹配。 C.退化时的巨大接受带宽（典型的是类型为0（或类型I）的相位匹配的OPO）提供了较宽的带宽，并且温度调节微不足道。通过使用压电镜上的反射镜微调腔体长度，使信号/闲置信号发生简并谐振，可以实现宽带振荡。使用8％的反射膜，我们将超过1000nm带宽的频率梳以3.1微米为中心进行耦合。布鲁斯特角处的1mm或2.5mm厚的ZnSe板可提供二阶群速度色散补偿，从而改善了OPO带宽。 OPO阈值测得小于30mW。锁定时，OPO输出以3.1微米为中心的60 mW平均功率。通过适当的腔内色散管理（包括chi镜），我们希望将光谱宽度扩展到八度或更大。

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