Low Phase Noise, Record-High Power Optical Parametric Oscillator Tunable from 2.7-4.7 μm for Metrology Applications
arxiv(2024)
摘要
Within the domain of optical frequency comb systems operating in the
mid-infrared, extensive exploration has been undertaken regarding critical
parameters such as stabilization, coherence, or spectral tunability. Despite
this, certain essential parameters remain inadequately addressed, particularly
concerning the light source prerequisites for advanced spectroscopy techniques
operating in the 3-5 μm spectral region. Specifically, the necessity for
high simultaneous stability of average power, spectral shape, and temporal
properties, alongside requirements for excellent beam quality and high powers
of several Watts, emerges for applications like cavity-enhanced Doppler-free
saturation spectroscopy. Existing systems fall short of meeting these rigorous
criteria. This study delves into the metrology aspects of an optical parametric
oscillator system, with a particular emphasis on its suitability for
powerhungry metrology applications. Notably, the highest average power reported
in the 3-5 μm region, reaching 10.3W for the idler output at 3.1
μm, is achieved. Additionally, new aspects, like the analysis of idler
phase noise and beam quality and the onset of higher order modes are discussed.
These findings represent a significant advancement towards the realization of
highly-stable, metrologygrade frequency combs in the mid-infrared, thereby
facilitating precision spectroscopy techniques previously constrained by light
source average powers and quality limitations.
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