chi-2光学超晶格盒谐振腔产生中红外光学频率梳
Mid-infrared optical frequency comb generation from a chi-2 optical superlattice box resonator
摘要：
中红外（MIR）波段的光学频率梳（OFC）由于其在波长和频率域的革命性精度而在精密光谱学、气体传感和分子指纹等应用中至关重要。基于微谐振器的OFC通过在紧凑且具有成本效益的封装中包含如此高的精度，向实际应用迈出了进一步。然而，色散工程仍然是一个挑战，传统的卡-3微环谐振器和MIR泵浦激光器是必需的。在这里，我们开发了一个不同的平台的卡-2光学超晶格盒谐振器产生MIR OFC的光参量下转换。在近材料限制的品质因数为2.0*10^7的情况下，可以产生在2060 nm附近具有超过250 nm跨度的宽带MIR OFC，其中仅需要普通的近红外激光器作为泵浦。细齿间距对应于1.566 GHz处的可测量的射频拍音，并且还导致细光谱分辨率。其线宽测量为6.1 kHz，这揭示了低梳状噪声，与干净的时间波形一致。这种中红外光纤耦合器具有370 mW以上的高输出功率，可用于远距离传感和测距应用。
英文摘要：
Optical frequency combs (OFCs) at Mid-Infrared (MIR) wavelengths are essential for applications in precise spectroscopy, gas sensing and molecular fingerprinting, because of its revolutionary precision in both wavelength and frequency domain. The microresonator-based OFCs make a further step towards practical applications by including such high precision in a compact and cost-effective package. However, dispersion engineering is still a challenge for the conventional chi-3 micro-ring resonators and a MIR pump laser is required. Here we develop a different platform of a chi-2 optical superlattice box resonator to generate MIR OFC by optical parametric down conversion. With near-material-limited quality factor of 2.0*10^7, broadband MIR OFC can be generated with over 250 nm span around 2060 nm, where only a common near-infrared laser is necessary as pump. The fine teeth spacing corresponds to a measurable radio frequency beat note at 1.566 GHz, and also results in a fine spectroscopy resolution. Its linewidth is measured to be 6.1 kHz, which reveals a low comb noise that agrees well with the clean temporal waveforms. With high output power of over 370 mW, such MIR OFC is capable for long distance sensing and ranging applications.
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