Dual-comb spectroscopic ellipsometry

Minamikawa, Takeo; Hsieh, Yi-Da; Shibuya, Kyuki; Hase, Eiji; Kaneoka, Yoshiki; Okubo, Sho; Inaba, Hajime; Mizutani, Yasuhiro; Yamamoto, Hirotsugu; Iwata, Tatsuya; Yasui, Takeshi

doi:10.1038/s41467-017-00709-y

Cited by 72 publications

(24 citation statements)

References 41 publications

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“…The inherent mode-locking nature and active laser control enable us to use an OFC as an optical frequency ruler traceable to a microwave or radio-frequency (RF) frequency standard. Based on the concept of an optical frequency ruler, OFCs have found several applications in optical frequency metrology and distance metrology; examples include atomic spectroscopy [2], gas spectroscopy [4], solid spectroscopy [5], spectroscopic ellipsometry [6], strain sensing [7], and distance measurement [8].…”

Section: Introductionmentioning

confidence: 99%

Refractive-index-sensing optical comb based on photonic radio-frequency conversion with intracavity multi-mode interference fiber sensor

Oe¹,

Taue²,

Minamikawa³

et al. 2018

Opt. Express

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Optical frequency combs (OFCs) have attracted attention as optical frequency rulers due to their tooth-like discrete spectra together with their inherent mode-locking nature and phase-locking control to a frequency standard. Based on this concept, their applications until now have been demonstrated in the fields of optical frequency metrology. However, if the utility of OFCs can be further expanded beyond their application by exploiting new aspects of OFCs, this will lead to new developments in optical metrology and instrumentation. Here, we report a fiber sensing application of OFCs based on a coherent link between the optical and radio frequencies, enabling high-precision refractive index measurement based on frequency measurement in radio-frequency (RF) region. Our technique encodes a refractive index change of a liquid sample into a repetition frequency of OFC by a combination of an intracavity multi-mode-interference fiber sensor and wavelength dispersion of a cavity fiber. Then, the change in refractive index is read out by measuring the repetition frequency in RF region based on a frequency standard. Use of an OFC as a photonic RF converter will lead to the development of new applications in high-precision fiber sensing with the help of functional fiber sensors and precise RF measurement.

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Section: Introductionmentioning

confidence: 99%

Refractive-index-sensing optical comb based on photonic radio-frequency conversion with intracavity multi-mode interference fiber sensor

Oe¹,

Taue²,

Minamikawa³

et al. 2018

Opt. Express

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“…1(b). Detail of its experimental setup is given elsewhere [18,19]. The detected electrical signal was acquired using a digitizer (National Instruments Corp., NI PXIe-5122; resolution = 14 bit).…”

Section: Methodsmentioning

confidence: 99%

Lock-in-detection dual-comb spectroscopy

Koresawa

Shibuya²,

Minamikawa³

et al. 2019

OSA Continuum

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Dual-comb spectroscopy (DCS) is useful for gas spectroscopy due to high potential of optical frequency comb (OFC). However, fast Fourier transform (FFT) calculation of a huge amount of temporal data spends significantly longer time than the acquisition time of an interferogram. In this article, we demonstrate frequency-domain DCS by a combination of DCS with lock-in detection, namely LID-DCS. LID-DCS directly extracts an arbitrary OFC mode from a vast number of OFC modes without the need for FFT calculation. Usefulness of LID-DCS is demonstrated in rapid monitoring of transient signal change and spectroscopy of hydrogen cyanide gas.

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“…Because of its remarkable capabilities, DCS has been adopted in several applications, e.g., broadband, high-precision, high-resolution gas spectroscopy [26,27], high-speed solid-state spectroscopy [28,29], time-resolved spectroscopy [30], nonlinear spectroscopy [31,32], terahertz spectroscopy [33], optical sensing [34,35], distance measurement [36], microscopy [37], and imaging [38]. These applications require high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

High-coherence ultra-broadband bidirectional dual-comb fiber laser

2019

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Dual-comb spectroscopy has emerged as an attractive spectroscopic tool for high-speed, high-resolution, and high-sensitivity broadband spectroscopy. It exhibits certain advantages when compared to the conventional Fourier-transform spectroscopy. However, the high cost of the conventional system, which is based on two mode-locked lasers and a complex servo system with a common single-frequency laser, limits the applicability of the dual-comb spectroscopy system. In this study, we overcame this problem with a bidirectional dual-comb fiber laser that generates two high-coherence ultra-broadband frequency combs with slightly different repetition rates (f rep). The two direct outputs from the single-laser cavity displayed broad spectra of > 50 nm; moreover, an excessively small difference in the repetition rate (< 1.5 Hz) was achieved with high relative stability, owing to passive common-mode noise cancellation. With this slight difference in the repetition rate, the applicable optical spectral bandwidth in dual-comb spectroscopy could attain ~479 THz (~3,888 nm). In addition, we successfully generated high-coherence ultra-broadband frequency combs via nonlinear spectral broadening and detected high signal-to-noise-ratio carrier-envelope offset frequency (f CEO) beat signals using the self-referencing technique. We also demonstrated the high relative stability between the two f CEO beat signals and tunability. To our knowledge, this is the first demonstration of f CEO detection and frequency measurement using a self-referencing technique for a dual-comb fiber laser. The developed high-coherence ultra-broadband dual-comb fiber laser with capability of f CEO detection is likely to be a highly effective tool in practical, high-sensitivity, ultra-broadband applications.

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Dual-comb spectroscopic ellipsometry

Cited by 72 publications

References 41 publications

Refractive-index-sensing optical comb based on photonic radio-frequency conversion with intracavity multi-mode interference fiber sensor

Refractive-index-sensing optical comb based on photonic radio-frequency conversion with intracavity multi-mode interference fiber sensor

Lock-in-detection dual-comb spectroscopy

High-coherence ultra-broadband bidirectional dual-comb fiber laser

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