Abstract
We present a laser system capable of producing 190 femtosecond pulses at a repetition rate of 20 GHz. The spectral masking of a phase modulated diode laser is used to produce a train of picosecond pulses which are compressed using a fibre-grating compressor followed by subsequent adiabatic soliton compression to the femtosecond regime using a tapered photonic crystal fiber.
Highlights
High repetition rate pulsed laser sources are of increasing importance due to their application in the field of optical frequency metrology [1]
We present a laser system capable of producing 190 femtosecond pulses at a repetition rate of 20 GHz
The spectral masking of a phase modulated diode laser is used to produce a train of picosecond pulses which are compressed using a fibre-grating compressor followed by subsequent adiabatic soliton compression to the femtosecond regime using a tapered photonic crystal fiber
Summary
High repetition rate (tens of gigahertz) pulsed laser sources are of increasing importance due to their application in the field of optical frequency metrology [1]. Such sources can be realized in the 1 μm wavelength region using fiber integrated technology through the active modelocking of laser cavities [2], control of intra-cavity modulation instability [3] or through extra-cavity amplitude modulation of a continuous wave (CW) signal. For example, Mach-Zehnder amplitude modulators or electro-absorption modulators can achieve high repetition rate modulation, the latter of these devices is not readily available at 1 μm, and both suffer from the fact that they require a DC bias offset to their voltage supply to ensure correct pulse shaping. The generated pulses are compressed to a duration of 190 fs using a combination of a fiber-grating compressor and adiabatic soliton compression in a dispersion-decreasing photonic crystal fiber
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