Quantum Frequency Reference at 3.39 μ Wavelength

É. I. Alekseev, E. N. Bazarov, Г. А. Герасимов +1 more

Cole Smith, Seth B. Cataño-Lopez, Bennett Sodergren +8 more

We present phase-coherent frequency comb generation over a wavelength range from 490 nm – 4 µm and show linewidth narrowing and optical frequency synthesis of both ultra stable and rugged, commercialized reference lasers. This is essential to address emerging quantum technologies including optical metrology and spectroscopy.

G. Garcia‐Arellano, J. C. de Aquino Carvalho, Hippolyte Mouhanna +6 more

Abstract Miniaturizing and integrating atomic vapor cells is widely investigated for the purposes of fundamental measurements and technological applications such as quantum sensing. Extending such platforms to the realm of molecular physics is a fascinating prospect that paves the way for compact frequency metrology as well as for exploring light-matter interactions with complex quantum objects. Here, we perform molecular rovibrational spectroscopy in a thin-cell of micrometric thickness, comparable to excitation wavelengths. We operate the cell in two distinct regions of the electromagnetic spectrum, probing ν1 + ν3 resonances of acetylene at 1.530 µm, within the telecommunications wavelength range, as well as the ν3 and ν2 resonances of SF6 and NH3 respectively, in the mid-infrared fingerprint region around 10.55 µm. Thin-cell confinement allows linear sub-Doppler transmission spectroscopy due to the coherent Dicke narrowing effect, here demonstrated for molecular rovibrations. Our experiment can find applications extending to the fields of compact molecular frequency references, atmospheric physics or fundamental precision measurements.

Peter D. D. Schwindt, John E. Kitching, Svenja A. Knappe +4 more

Longfei Yin, Bin Luo, Anhong Dang +1 more

An excited state Faraday anomalous dispersion optical filter (ES-FADOF) working at the optical communication wavelength (1.5 μm) is realized. Unlike the usual ES-FADOF schemes using an external frequency stabilization, an internal frequency stabilization scheme is proposed and the working atoms inside the filter are adopted as the reference. A particular cross line of multiple transitions is used for the frequency stabilization for the pump laser and thus, a higher pump efficiency is achieved. For example, compared with previous ES-FADOF schemes, this method can increase the transmittance from 10% to 60% at 100 °C. Moreover, in this scheme, the external frequency stabilization is not necessary and the volume of the atomic filter can be reduced. This simplifies the whole structure and a compact ES-FADOF can thus be realized.

Yong Hui Yu