17 research outputs found
Self-referencing a continuous-wave laser with electro-optic modulation
We phase-coherently measure the frequency of continuous-wave (CW) laser light
by use of optical-phase modulation and f-2f nonlinear interferometry. Periodic
electro-optic modulation (EOM) transforms the CW laser into a continuous train
of picosecond optical pulses. Subsequent nonlinear-fiber broadening of this EOM
frequency comb produces a supercontinuum with 160 THz of bandwidth. A critical
intermediate step is optical filtering of the EOM comb to reduce
electronic-noise-induced decoherence of the supercontinuum. Applying f-2f
self-referencing with the supercontinuum yields the carrier-envelope offset
frequency of the EOM comb, which is precisely the difference of the CW laser
frequency and an exact integer multiple of the EOM pulse repetition rate. Here
we demonstrate absolute optical frequency metrology and synthesis applications
of the self-referenced CW laser with <5E-14 fractional accuracy and stability.Comment: 8 pages, 4 figure
Microresonator frequency comb optical clock
Optical frequency combs serve as the clockwork of optical clocks, which are now the best time-keeping systems in existence. The use of precise optical time and frequency technology in various applications beyond the research lab remains a significant challenge, but one that integrated microresonator technology is poised to address. Here, we report a silicon-chip-based microresonator comb optical clock that converts an optical frequency reference to a microwave signal. A comb spectrum with a 25 THz span is generated with a 2 mm diameter silica disk and broadening in nonlinear fiber. This spectrum is stabilized to rubidium frequency references separated by 3.5 THz by controlling two teeth 108 modes apart. The optical clockâs output is the electronically countable 33 GHz microcomb line spacing, which features stability better than the rubidium transitions by the expected factor of 108. Our work demonstrates the comprehensive set of tools needed for interfacing microcombs to state-of-the-art optical clocks
Phase-coherent microwave-to-optical link with a self-referenced microcomb
Precise measurements of the frequencies of light waves have become common with mode-locked laser frequency combs1. Despite their huge success, optical frequency combs currently remain bulky and expensive laboratory devices. Integrated photonic microresonators are promising candidates for comb generators in out-of-the-lab applications, with the potential for reductions in cost, power consumption and size. Such advances will significantly impact fields ranging from spectroscopy and trace gas sensing to astronomy, communications and atomic time-keeping. Yet, in spite of the remarkable progress shown over recent years, microresonator frequency combs (âmicrocombsâ) have been without the key function of direct fâ2f self-referencing, which enables precise determination of the absolute frequency of each comb line. Here, we realize this missing element using a 16.4â
GHz microcomb that is coherently broadened to an octave-spanning spectrum and subsequently fully phase-stabilized to an atomic clock. We show phase-coherent control of the comb and demonstrate its low-noise operation
Phase Coherent Link of an Atomic Clock to a Self-Referenced Microresonator Frequency Comb
The counting and control of optical cycles of light has become common with
modelocked laser frequency combs. But even with advances in laser technology,
modelocked laser combs remain bulk-component devices that are hand-assembled.
In contrast, a frequency comb based on the Kerr-nonlinearity in a dielectric
microresonator will enable frequency comb functionality in a micro-fabricated
and chip-integrated package suitable for use in a wide-range of environments.
Such an advance will significantly impact fields ranging from spectroscopy and
trace gas sensing, to astronomy, communications, atomic time keeping and
photonic data processing. Yet in spite of the remarkable progress shown over
the past years, microresonator frequency combs ("microcombs") have still been
without the key function of direct f-2f self-referencing and phase-coherent
frequency control that will be critical for enabling their full potential. Here
we realize these missing elements using a low-noise 16.4 GHz silicon chip
microcomb that is coherently broadened from its initial 1550 nm wavelength and
subsequently f-2f self-referenced and phase-stabilized to an atomic clock. With
this advance, we not only realize the highest repetition rate octave-span
frequency comb ever achieved, but we highlight the low-noise microcomb
properties that support highest atomic clock limited frequency stability
Phase Coherent Link of an Atomic Clock to a Self-Referenced Microresonator Frequency Comb
The counting and control of optical cycles of light has become common with modelocked laser frequency combs. But even with advances in laser technology, modelocked laser combs remain bulk-component devices that are hand-assembled. In contrast, a frequency comb based on the Kerr-nonlinearity in a dielectric microresonator will enable frequency comb functionality in a micro-fabricated and chip-integrated package suitable for use in a wide-range of environments. Such an advance will significantly impact fields ranging from spectroscopy and trace gas sensing, to astronomy, communications, atomic time keeping and photonic data processing. Yet in spite of the remarkable progress shown over the past years, microresonator frequency combs ("microcombs") have still been without the key function of direct f-2f self-referencing and phase-coherent frequency control that will be critical for enabling their full potential. Here we realize these missing elements using a low-noise 16.4 GHz silicon chip microcomb that is coherently broadened from its initial 1550 nm wavelength and subsequently f-2f self-referenced and phase-stabilized to an atomic clock. With this advance, we not only realize the highest repetition rate octave-span frequency comb ever achieved, but we highlight the low-noise microcomb properties that support highest atomic clock limited frequency stability
Einzelne Farbzentren in Diamant : Grundlegende physikalische Eigenschaften, Nanophotonik und Quantenoptik
Negativ geladene Zentren, bestehend aus einem Stickstoff-Atom und einer Fehlstelle (NV), sind aufgrund ihrer auĂergewöhnlichen strukturellen StabilitĂ€t und ihren Spineigenschaften vielversprechend fĂŒr Anwendungen im Bereich der Quantenoptik und Photonik. Ein umfassendes VerstĂ€ndnis der Anregung und des Auslesens der Lumineszenz individueller NV-Zentren ist dabei von grundlegender Bedeutung. Die Arbeit analysiert und interpretiert die Photolumineszenz-Emission einzelner NV-Defektzentren in Diamant in AbhĂ€ngigkeit der anregenden LaserwellenlĂ€nge. Die Untersuchung liefert ein neues physikalisches VerstĂ€ndnis der LadungszustĂ€nde einzelner NV-Zentren und erlaubt die Bestimmung der optimalen AnregungswellenlĂ€nge vernab der Resonanz