Abstract
The tri-comb-based multi-heterodyne detection technique has been proven to be a powerful tool for precision metrology, e.g., laser ranging and spectroscopy. However, in existing tri-comb generation methods, it is difficult to provide a large and variable difference in tri-comb repetition rates. In this paper; we propose a multidimensional multiplexing mode-locked laser based on a dual-ring integrative structure. Combining the dimensions of sub-ring multiplexing and wavelength multiplexing, two modes of tri-comb generation can be achieved with the dual-ring single cavity laser. The generated combs are identified based on the relative intensity of the pulse trains and optical spectrum, and the repetition rates of dual-combs from the same sub-ring are distinguished based on dispersion analysis. With repetition rates of approximately 47 MHz and 49.6 MHz, the minimum and maximum repetition rate difference of the generated tri-comb can be changed from 2.38 kHz and 2.59526 MHz to 2.74 kHz and 2.59720 MHz merely by switching the operation mode of the dual-ring integrated mode-locked laser. The obtained results indicate that our method can offer a powerful scheme for future multi-comb generation and its application in multi-heterodyne detection-based laser ranging and spectroscopy.
Highlights
The application of dual-combs with slightly different repetition rates has enabled a revolutionary new technique for the field of detection and metrology, e.g., laser ranging [1,2,3,4], velocity measurement [5]and precision spectroscopy [6,7,8]
Based on our previous studies of the dual-ring mode-locked laser [29], we have found that it is an effective and simple way to achieve variable repetition rates
In summary,a multidimensional a multidimensional multiplexing mode-locked laseronbased on a integrative dual-ring structure is proposed for tri-comb generation in this paper
Summary
The application of dual-combs with slightly different repetition rates has enabled a revolutionary new technique for the field of detection and metrology, e.g., laser ranging [1,2,3,4], velocity measurement [5]and precision spectroscopy [6,7,8]. The application of dual-combs with slightly different repetition rates has enabled a revolutionary new technique for the field of detection and metrology, e.g., laser ranging [1,2,3,4], velocity measurement [5]. Sci. 2020, 10, 8260 for multi-heterodyne detection is the different scale of differences among the repetition rates of the tri-comb. The existing dual-comb generation schemes can hardly fulfill the requirements for the tri-comb technique, as has been discussed in a previous review paper [10]. The obvious disadvantage of this scheme is the system’s complexity and expensiveness Another approach to dual-comb generation is based on the multiplexing of parameters of a single-cavity laser. Tri-combs and even quad-combs have been reportedly generated by wavelength multiplexing [18], the instability and difficulty of their realization prohibits a broader application of the scheme
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