Abstract
This paper shows the experimental details of the stabilization scheme that allows full control of the repetition rate and the carrier-envelope offset frequency of a 10 GHz frequency comb based on a femtosecond Ti:sapphire laser. Octave-spanning spectra are produced in nonlinear microstructured optical fiber, in spite of the reduced peak power associated with the 10 GHz repetition rate. Improved stability of the broadened spectrum is obtained by temperature-stabilization of the nonlinear optical fiber. The carrier-envelope offset frequency and the repetition rate are simultaneously frequency stabilized, and their short- and long-term stabilities are characterized. We also measure the transfer of amplitude noise of the pump source to phase noise on the offset frequency and verify an increased sensitivity of the offset frequency to pump power modulation compared to systems with lower repetition rate. Finally, we discuss merits of this 10 GHz system for the generation of low-phase-noise microwaves from the photodetected pulse train.
Highlights
Frequency-comb sources with mode spacing in the range of tens of gigahertz are of increasing interest for applications in optical frequency metrology, microwave photonics [1], photonic microwave generation [2], and astronomical [3] and laboratory spectroscopy [4]
This paper shows the experimental details of the stabilization scheme that allows full control of the repetition rate and the carrier-envelope offset frequency of a 10 GHz frequency comb based on a femtosecond Ti:sapphire laser
Octave-spanning spectra are produced in nonlinear microstructured optical fiber, in spite of the reduced peak power associated with the 10 GHz repetition rate
Summary
Frequency-comb sources with mode spacing in the range of tens of gigahertz are of increasing interest for applications in optical frequency metrology, microwave photonics [1], photonic microwave generation [2], and astronomical [3] and laboratory spectroscopy [4]. For many of the laser-based approaches, the pulse energy is too low to provide an octave-spanning spectrum, as required for self-referenced stabilization of the offset frequency [19, 20]. We use an end-sealed and temperature stabilized microstructured fiber This allows stable generation of an octave-spanning spectrum and reliable locking of the comb with stable operation for times scales of 1 to 2 hours. The unique properties of the laser, including its high repetition rate, short pulses and high average power, make it an interesting candidate for high-power low-noise microwave generation Along these lines, we demonstrate the generation of a 10 GHz microwave signal with 0 dBm power. Directly from a high-speed, high-power InGaAs photodiode that detects the 10 GHz pulse train
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