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Frequency combs, i.e. spectra of equidistant laser lines, are enabling tools in precision spectroscopy and optical frequency metrology [1,2]. Conventionally, frequency combs are generated using mode-locked lasers, where the mode-locking of the optical comb lines implies the generation of a train of ultra-short optical pulses. Frequency combs can link optical frequencies to radio-frequencies (RF) and...
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 demonstrate soliton mode-locking in continuously pumped, non-linear optical MgF2 microresonators, resulting in low noise frequency comb spectra and ultra-short pulses of 200 fs duration with a repetition rate of 35.2 GHz.
We demonstrate spectral broadening of a low noise microresonator based near-infrared frequency comb to almost two thirds of an octave as required for self-referencing. The low noise properties of the unbroadened spectrum are preserved.
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.
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.
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