Direct frequency comb spectroscopy

Stowe, Matthew C.; Thorpe, Michael J.; Pe'er, Avi; Ye, Jun; Stalnaker, Jason; Gerginov, Vladislav; Diddams, Scott A.

doi:10.1016/s1049-250x(07)55001-9

Cited by 98 publications

(77 citation statements)

References 147 publications

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“…Then, when the combination of f rep and f off causes a comb tooth to be resonant with a transition between the ground state and a state in an excited manifold, the excited state is efficiently excited. Remarkably, it has also been shown 3,5,6 that states in higher manifolds can also be excited through non-resonant two-comb-tooth excitation,…”

Section: Introductionmentioning

confidence: 99%

Measurement of ionization in direct frequency comb spectroscopy

Lomsadze

Fehrenbach

DePaola

2013

Journal of Applied Physics

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Direct frequency comb spectroscopy is currently one of the most precise techniques for studying the internal structure of atomic and molecular systems. In this technique, a train of ultrafast laser pulses excites states in the target system which then relax, emitting fluorescence. The measured fluorescence is then plotted as a function of the comb parameters. But according to recent theory, the ultrashort pulses from the comb laser can also significantly ionize the target. Here, we test this theory by measuring the ion signal from direct frequency comb spectroscopy. Furthermore, instead of actively controlling the frequency comb parameters, we allow them to drift passively, measuring them and the ion signal simultaneously. The experiments were found to be in satisfactory agreement with theory, and the passive comb approach was found to be functional, though not as convenient as the conventional actively locked comb. V C 2013 American Institute of Physics.

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Section: Introductionmentioning

confidence: 99%

Measurement of ionization in direct frequency comb spectroscopy

Lomsadze

Fehrenbach

DePaola

2013

Journal of Applied Physics

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“…Direct-frequency comb spectroscopy (DFCS) is a powerful, relatively new technique for high-resolution spectroscopy on atomic or molecular systems [1][2][3]. In DFCS a mode-locked laser is run with its repetition rate locked to a precision rf frequency reference.…”

Section: Introductionmentioning

confidence: 99%

“…The teeth frequencies are stable and constant in time. As explained in several review articles [3,4], DFCS measurements are made by scanning either f rep , or f 0 , and observing fluorescence whenever a comb tooth is resonant with a transition in the target system. Because the frequency of the comb tooth is known (modf rep ) from Eq.…”

Section: Introductionmentioning

confidence: 99%

Calculation of ionization in direct-frequency comb spectroscopy

2012

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Direct-frequency comb spectroscopy (DFCS) is currently the highest-resolution absolute frequency spectroscopic technique known. In general, one does DFCS by scanning the repetition rate, f rep , of a comb laser and measuring fluorescence from the excited states of the species under study. The technique has already been successfully characterized by a theoretical model that starts with the optical Bloch equations and, with a few simplifying assumptions converts them into linear coupled iterative equations. In the present work we build on that successful model to predict the characteristics of the ion yield from photoionization by the comb laser, as a function of f rep . We show that the ion spectrum yields the same atomic structure as the fluorescence spectra, but with greater efficiency.

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“…Therefore mode-locked GHzlasers are multi-wavelength sources that can be used for wavelength-division-multiplexing (WDM) systems [5]. Besides telecom applications, GHz frequency combs are highly anticipated for direct frequency comb spectroscopy [6], as they offer high spectral power per comb line leading to an increased SNR for precision frequency measurements. Also applications such as optical clocks [7] or the frequency comb calibration of high-resolution astronomical spectrographs [8][9][10] benefit from GHz frequency combs.…”

Section: Introductionmentioning

confidence: 99%

Picosecond diode-pumped 1.5 μm Er,Yb:glass lasers operating at 10–100 GHz repetition rate

et al. 2010

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Stable ultrafast laser sources at multi-GHz repetition rates are important for various application areas, such as optical sampling, frequency comb metrology, or advanced high-speed return-to-zero telecom systems. We review SESAM-mode-locked Er,Yb:glass lasers operating in the 1.5 µm spectral region at multi-GHz repetition rates, discussing the key improvements that have enabled increasing the repetition rate up to 100 GHz. We also present further improved results with shorter pulse durations from a 100 GHz Er,Yb:glass laser. With an improved SESAM design we achieved 1.1 ps pulses with up to 30 mW average output power. Moreover, we discuss for the first time the importance of beam quality deteriorations arising from frequency-degenerate higher order spatial modes in such lasers.

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Direct frequency comb spectroscopy

Cited by 98 publications

References 147 publications

Measurement of ionization in direct frequency comb spectroscopy

Measurement of ionization in direct frequency comb spectroscopy

Calculation of ionization in direct-frequency comb spectroscopy

Picosecond diode-pumped 1.5 μm Er,Yb:glass lasers operating at 10–100 GHz repetition rate

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