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A long-fiber-based ring cavity has been applied to repetition rate multiplication of a fiber-based optical frequency comb with a multiplication factor of 5. Mode filtering of a 48.73-MHz repetition rate fiber comb generates a 243.65-MHz-comb.
One-shot 3D tomographic imaging with a chirped-frequency comb is demonstrated using 2D pulse-to-pulse spectral interferometry. The profile of the glasses' layered structure is measured, and the thickness of each layer is deduced with 100-nm-level uncertainty.
Relative carrier envelope phase control was actively exploited in dual-comb spectroscopy, and polarization-modulated pulse train generation and its coherent detection were demonstrated. This proof-of-principle experiment promotes advanced coherent spectroscopy using optical frequency combs.
We developed a microwave-referenced optical single frequency generator based on a fully stabilized, self-referenced 750-MHz Yb fiber laser frequency comb. The device could continuously generate the optical frequencies and the tuning speed reaches 60 GHz/s.
A long-fiber-based ring resonator for repetition rate multiplication of a fiber-based optical frequency comb has been demonstrated. Mode filtering of a 48.73 MHz repetition rate fiber-based comb generates a 243.65 MHz frequency comb with a multiplication factor of 5.
Dual-comb spectroscopy is a powerful spectroscopic method that can measure broadband spectral information with high accuracy and a short acquisition time. We have been particularly developing a new method to evaluate the complex refractive index of solid samples based on the dual-comb technique. In this research, we aimed to realize a simple and practical dual-comb spectroscopic system with broad...
In this study, we particularly focus on the coherent controllability of optical frequency combs. By appropriately adjusting the four frequency parameters involved in dual-comb spectroscopy, frep, Δfrep, fceo, and Δfceo, unique and arbitrary coherent modulation schemes can be realized. In a demonstration, the interferogram was successfully modulated by controlling the Δfceo. This proof-of-principle...
We developed a one-shot multi-point three-dimensional (3D)-measurement method using a bundle composed of 55 multi-mode fibers based on ultrafast space-time-frequency conversion with a chirped optical frequency comb. We demonstrated measurement of the 3D profile of a reflective object by one-shot imaging using the fiber bundle with micrometer accuracy.
Non-scanning three-dimensional imaging with a chirped-frequency comb is demonstrated using two-dimensional (2D) pulse-to-pulse spectral interferometry and 2D spectroscopy. The profile of a structure of three gauge blocks was measured with μm-level uncertainty.
High-accuracy self-correction of air refractive index was demonstrated with simultaneous measurement of group and phase indices. Using precise detection of the pulse envelope and the carrier phase with an optical frequency comb interferometer, a method similar to the two-color correction method was applied, but using a light source in a single wavelength region. In this study, air refractive index...
Dual-comb spectroscopy (DCS) is a new Fourier spectroscopic method which realizes precise and rapid spectral detection with a broad bandwidth. In this study, we applied DCS to characterization of birefringence of anisotropic materials. As a demonstration, we evaluated the refractive index and the birefringence of an anisotropic crystal, Nd:YVO4. We confirmed the evaluated values were consistent to...
Optical frequency comb interferometer based on balanced optical cross correlation and optical heterodyne techniques have been demonstrated. The method can be used to determine absolute distance with coherent link between pulse envelope and interferometric phase.
We report a narrow mode linewidth (∼60 kHz) of 750-MHz-spaced Yb:fiber frequency comb and full phase stabilization by f-to-2f interferometer and locking to Er:fiber comb with CW laser. Preliminary further narrowing relative linewidth is demonstrated.
One-shot 3D imaging-method with a chirped frequency comb was demonstrated using 2D pulse-to-pulse spectral interferometry. A step-height was measured with 6.1-μm-uncertainty, currently limited by the detection system. The method has large dynamic-range with high precision.
Dual-comb spectroscopy was applied for characterization of complex refractive-index of a Si wafer and transient interferogram by optical excitation in an InGaAs-based saturable absorber. Full-characterization tool with wide dynamic-range in time- and frequency-domain is provided.
Extremely high-accuracy self-correction of the air refractive index was achieved using two-color comb interferometry exhibiting phase difference measurement with 10−11-order resolution. Obtained 10−9-order self-correction accuracy over 61-m exceeded the limit of empirical equation.
A terahertz (THz) frequency synthesizer based on photomixing of two near-infrared lasers with a sub-THz to THz frequency offset is a powerful tool for spectroscopy of polar gas molecules due to its broad spectral coverage; however, its frequency accuracy and resolution are relatively low. To tune the output frequency continuously and widely while maintaining its traceability to a frequency standard,...
A 167-m fiber-based optical frequency comb interferometer was stabilized to nm-level with extremely wide scanning of 2.8 m by frequency scanning. Fiber noise cancellation with direct use of a frequency comb was also demonstrated.
We developed a fiber-based optical frequency comb interferometer with fiber noise cancellation technique. Long reference path was stabilized to nm-level, and extremely wide length scanning range of 2.8-m was demonstrated only by repetition frequency tuning.
Ultrahigh-precision length metrology using fiber-based optical frequency combs are presented. By precisely controlling the frequency and phase of the combs, self-correction of air refractive index and noise cancellation in fiber path in interferometer are demonstrated.
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