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We report on a novel electro-optic modulator that acts on the carrier-envelope-offset frequency of a femtosecond pulsed laser with negligible cross-talk to the position of the optical carrier modes. The fast response on the nanosecond time scale allows to stabilize the carrier-envelope-offset frequency with a bandwidth in excess of 1 MHz while not perturbing a potential independent stabilization of...
We investigated the transfer of a 194 THz optical frequency along a 1840 km fiber link. The fractional frequency instability expressed as the modified Allan deviation is 2.7 × 10−15 at 1 s with 4 × 10−19 after 100 s. The transferred frequency shows no systematic offset within an uncertainty of 3 × 10−19. Analyzing the underlying noise structure reveals a τ−2 response in the modified Allan deviation,...
We reference high-precision spectroscopy on atomic hydrogen measured with an uncertainty of 4×10−15 to a remote Cs-fountain clock using a 920 km actively noise-compensated fiber link.
We experimentally investigate the initial dynamics of Kerr-frequency comb formation in crystalline MgF2 and planar Si3N4 microresonator and present a universal, platform independent condition for low phase noise performance.
Measuring the beating signal between two phase-coherent frequency combs leads to a novel broadband spectroscopy, which improves a million-fold the resolution, the recording time and the accuracy of the frequency scale of Fourier transform spectroscopy, which has been up to now the most efficient technique for multiplex optical diagnostics. With a demonstrated thousand-fold enhancement of the absorption...
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.
Er3+ -doped fiber-lasers efficiently generate frequency-combs for optical frequency metrology. We have for the first time resolved the two main concerns against fiber lasers vs the well established Ti:Sa technology by increasing the repetition rate to 250 MHz and decreasing the carrier envelope offset phase noise well below 1 rad.
Er3+-doped fiber-lasers efficiently generate frequency-combs for optical frequency metrology. 3.5 nJ energy, 35 fs duration and 100 MHz repetition-rate laser pulses are used to obtain an octave spanning frequency-comb in the visible.
Summary form only given. The reciprocal relationship between time and frequency implies that a single short laser pulse has a broad spectrum. A pulse circulating inside a laser cavity or the periodic pulse train if a mode-locked laser, however, can be described as a coherent superposition of discrete laser modes. This frequency-domain comb of modes is now providing an elegant and universal solution...
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