Iwakuni Kana, Porat Gil, Bui Thinh Q, Bjork Bryce J, Schoun Stephen B, Heckl Oliver H, Fermann Martin E, Ye Jun
1Department of Physics, JILA, National Institute of Standards and Technology and University of Colorado, University of Colorado, Boulder, CO 80309 USA.
Present Address: Honeywell International, 303 Technology Court, Broomfield, CO 80021 USA.
Appl Phys B. 2018;124(7):128. doi: 10.1007/s00340-018-6996-8. Epub 2018 Jun 6.
Long-wavelength mid-infrared (MIR) frequency combs with high power and flexible tunability are highly desired for molecular spectroscopy, including investigation of large molecules such as C. We present a high power, phase-stabilized frequency comb near 10 μm, generated by a synchronously pumped, singly resonant optical parametric oscillator (OPO) based on AgGaSe. The OPO can be continuously tuned from 8.4 to 9.5 μm, with a maximum average idler power of 100 mW at the center wavelength of 8.5 μm. Both the repetition rate ( ) and the carrier-envelope offset frequency ( ) of the idler wave are phase-locked to microwave signals referenced to a Cs clock. We describe the detailed design and construction of the frequency comb, and discuss potential applications for precise and sensitive direct frequency comb spectroscopy.
高功率且可调谐性灵活的长波长中红外（MIR）频率梳对于分子光谱学，包括对诸如C等大分子的研究来说是非常需要的。我们展示了一种基于AgGaSe的同步泵浦单谐振光学参量振荡器（OPO）产生的、接近10μm的高功率、相位稳定的频率梳。该OPO可在8.4至9.5μm范围内连续调谐，在中心波长8.5μm处的最大平均闲频功率为100mW。闲频波的重复频率（ ）和载波包络偏移频率（ ）都被锁相到以铯钟为参考的微波信号。我们描述了频率梳的详细设计和构造，并讨论了其在精确和灵敏的直接频率梳光谱学中的潜在应用。
