Fully referenced single-comb interferometry using optical sampling by laser-cavity tuning

Potvin, Simon; Boudreau, Stéphane; Deschênes, Jean-Daniel; Genest, Jérôme

doi:10.1364/ao.52.000248

Cited by 27 publications

(11 citation statements)

References 11 publications

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“…One of the simplest variations of DCS and FTIR is the use of a single frequency comb coupled with an unbalanced interferometer [102][103][104][105]. Sometimes referred to as optical scanning by cavity tuning (OSCAT), this technique works by continuously scanning the repetition rate of the comb [106].…”

Section: Related Near-ir Systemsmentioning

confidence: 99%

Dual-comb spectroscopy

Coddington

Newbury

Swann

2016

Optica

1,308

621

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Dual-comb spectroscopy is an emerging new spectroscopic tool that exploits the frequency resolution, frequency accuracy, broad bandwidth, and brightness of frequency combs for ultrahigh-resolution, high-sensitivity broadband spectroscopy. By using two coherent frequency combs, dual-comb spectroscopy allows a sample's spectral response to be measured on a comb tooth-by-tooth basis rapidly and without the size constraints or instrument response limitations of conventional spectrometers. This review describes dual-comb spectroscopy and summarizes the current state of the art. As frequency comb technology progresses, dual-comb spectroscopy will continue to mature and could surpass conventional broadband spectroscopy for a wide range of laboratory and field applications.

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Section: Related Near-ir Systemsmentioning

confidence: 99%

Dual-comb spectroscopy

Coddington

Newbury

Swann

2016

Optica

1,308

621

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“…The unbalanced optical delay provided by the unequal-path interferometer magnifies a small variation of L c to a large OPD scale (See Figs. 1(b) and 1(c)) [18,[30][31][32][33][34]. When the resulting OPD is near m·L c (where, m = 1, 2, 3 …), the m th pulse (P m ) meets the leading reference pulse (P 0 ).…”

Section: Low-coherence Interferometry By Scanning the Repetition Ratementioning

confidence: 99%

Femtosecond laser pulses for fast 3-D surface profilometry of microelectronic step-structures

et al. 2013

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Fast, precise 3-D measurement of discontinuous step-structures fabricated on microelectronic products is essential for quality assurance of semiconductor chips, flat panel displays, and photovoltaic cells. Optical surface profilers of low-coherence interferometry have long been used for the purpose, but the vertical scanning range and speed are limited by the micro-actuators available today. Besides, the lateral field-of-view extendable for a single measurement is restricted by the low spatial coherence of broadband light sources. Here, we cope with the limitations of the conventional low-coherence interferometer by exploiting unique characteristics of femtosecond laser pulses, i.e., low temporal but high spatial coherence. By scanning the pulse repetition rate with direct reference to the Rb atomic clock, step heights of ~69.6 μm are determined with a repeatability of 10.3 nm. The spatial coherence of femtosecond pulses provides a large field-of-view with superior visibility, allowing for a high volume measurement rate of ~24,000 mm3/s.

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“…In this investigation, as an alternative method, FT spectroscopy is performed by sweeping the repetition rate ( f r ) of the femtosecond laser being used as the light source. This f r -sweeping method eliminates the interferometer arm scanning of conventional FT by employing a PZT micro-actuator so as to stretch the cavity length of the femtosecond laser 23 . In fact, the f r -sweeping method has already been successfully demonstrated not only for spectroscopy 24 and lidar applications 25 but also for long distance measurements 26 and pulse duration estimation 27 28 .…”

Section: Introductionmentioning

confidence: 99%

Fourier-transform spectroscopy using an Er-doped fiber femtosecond laser by sweeping the pulse repetition rate

Lee

Jang

et al. 2015

Sci Rep

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Femtosecond lasers allow for simultaneous detection of multiple absorption lines of a specimen over a broad spectral range of infrared or visible light with a single spectroscopic measurement. Here, we present an 8-THz bandwidth, 0.5-GHz resolution scheme of Fourier-transform spectroscopy using an Er-doped fiber femtosecond laser. A resolving power of 1.6 × 104 about a 1560-nm center wavelength is achieved by sweeping the pulse repetition rate of the light source on a fiber Mach-Zehnder interferometer configured to capture interferograms with a 0.02-fs temporal sampling accuracy through a well-stabilized 60-m unbalance arm length. A dual-servo mechanism is realized by combining a mechanical linear stage with an electro-optic modulator (EOM) within the fiber laser cavity, enabling stable sweeping control of the pulse repetition rate over a 1.0-MHz scan range with 0.4-Hz steps with reference to the Rb clock. Experimental results demonstrate that the P-branch lines of the H13CN reference cell can be observed with a signal-to-noise ratio reaching 350 for the most intense line.

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Fully referenced single-comb interferometry using optical sampling by laser-cavity tuning

Cited by 27 publications

References 11 publications

Dual-comb spectroscopy

Dual-comb spectroscopy

Femtosecond laser pulses for fast 3-D surface profilometry of microelectronic step-structures

Fourier-transform spectroscopy using an Er-doped fiber femtosecond laser by sweeping the pulse repetition rate

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