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An octave-spanning frequency comb is generated using electro-optic modulation of a 1550 nm laser and nonlinear broadening. With this comb we demonstrate offset frequency detection, precise metrology, and ultrastable synthesis of 10 GHz microwaves.
We demonstrate an optical clock based on stabilization of a microcomb to rubidium optical transitions. The clock's output is the 33 GHz microcomb line spacing, which is a coherent, integer sub-division of the rubidium reference.
The mid-infrared spectral range (λ∼2–20 mm) is of particular importance as many molecules exhibit strong vibrational fingerprints in this region. Optical frequency combs [1, 2] — broadband optical sources consisting of equally spaced and mutually coherent sharp lines — are creating new opportunities for advanced spectroscopy [3, 4, 5]. Here we demonstrate a novel approach to create mid-infrared optical...
We present mid-infrared frequency comb generation from crystalline MgF2 microresonators, with mode spacing of 50–150 GHz around the 2.5 μm-wavelength CW-pump. Low phase-noise is verified by beating the comb modes with a narrow linewidth CW laser.
Ultra-high-Q whispering gallery mode (WGM) resonators, with the ability to confine and store optical energy in small volumes enable optical frequency comb generation via four-wave mixing (FWM) [1] as first demonstrated in fused silica microtoroids [2,3]. In contrast to fused silica, resonators made from crystalline materials [4–9] such as CaF2, MgF2 and quartz feature exceptionally low loss over a...
Laser frequency combs [1,2] have become enabling tools for a growing tree of applications, from calibration of astrophysical spectrographs to molecular science. Extension of the frequency comb technology to the mid-infrared “molecular fingerprint” region (2–20 µm) proves crucial for spectroscopy, astronomy and optical diagnosis as most of the strong fundamental molecular vibration frequencies are...
We present for the first time mid-infrared frequency comb generation from micro-resonators. Combs spanning over more than 10 THz around the 2.5 μm-wavelength CW-pump are generated in crystalline MgF2 whispering-gallery mode resonators via four-wave-mixing.
We demonstrate frequency comb generation via four-wave-mixing in crystalline MgF2 whispering-gallery mode resonators. More than 800 comb lines spaced by 43 GHz are observed. Second order autocorrelation is performed for time-domain characterization.
We investigate nonlinear frequency conversion in an ultra high-Q CaF2 whispering gallery mode resonator with finesse exceeding 1 million. Raman lasing and four-wave mixing in the intermediate infrared spectral region is reported.
We present a versatile approach that allows for both precise and broadband measurements of transmission spectra by transferring the precision of an optical frequency comb to a mode-hop free tunable external cavity diode laser. The advantage of using a tunable diode laser compared to other methods such as direct frequency comb spectroscopy or multi-heterodyne spectroscopy is the ability to resolve...
We present a simple method that enables fast, broadband spectroscopy at sub-Megahertz resolution over >4 THz bandwidth using a mode-hop-free tunable diode laser and a frequency comb. This scheme is utilized to measure microresonator dispersion.
We demonstrate independent control and full stabilization of the offset frequency and mode spacing of a frequency comb generated in a monolithic microcavity. The comb lines relative deviation from equidistance is less than 7.3times10-18.
This work demonstrates silica microspheres that possess ultra-high-Q optical whispering gallery modes, and simultaneously exhibit mechanical modes in the radio frequency range that can be excited by radiation pressure force. In contrast to previous studies that deal with vibrational modes of nanospheres using Raman or Brillouin scattering from ensembles, this work reports the parametric oscillation...
In this paper, the authors report on the first the experimental observation of this phenomenon using very high-finesse toroidal silica microresonators (Schliesser, 2006). These structures possess whispering gallery type optical modes (with photon lifetimes up to 500 ns) while simultaneously exhibiting micromechanical resonances in the radio-frequency domain. We study the interaction of the intracavity...
Owing to the ultra-high optical Q-factors and small mode volumes, fused silica toroidal microcavities are well suited for generation of light via nonlinear frequency conversion. Optical parametric oscillations (OPO) in microcavities have recently been reported in (Kippenberg et al., 2004) and theoretically explained in (Matsko et al., 2005). Furthermore, it has been shown that the parametric process...
We demonstrate how dynamical backaction of radiation pressure can be exploited for passive laser-cooling of high-frequency (>50 MHz) mechanical oscillation modes of ultra-high-finesse optical microcavities from room temperature to 11 K.
It is shown that the optical sidebands generated via optical parametric oscillations in a monolithic microcavity are equidistant thus overcoming the intrinsic cavity dispersion. This leads to the generation of optical frequency combs at input powers < 10 mW.
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