Observation of 200th harmonic with fractional linewidth of 10-10 in a microwave frequency comb generated in a tunneling junction

Mark J. Hagmann; Antoinette Jane Taylor; Dmitry Anatolievitch Yarotski

doi:10.1063/1.4769982

Observation of 200th harmonic with fractional linewidth of 10^-10 in a microwave frequency comb generated in a tunneling junction

Mark J. Hagmann
, Antoinette Jane Taylor
, Dmitry Anatolievitch Yarotski

Los Alamos National Laboratory

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

A microwave frequency comb with up to 200th harmonic of a laser repetition rate is generated by nonlinear intermodal mixing of 15 fs laser pulses in the junction of a scanning tunneling microscope. The highest harmonic has an output power of -146 dBm at 14.85GHz with a signal/noise ratio of 20dB and a measured linewidth of 1.2Hz, which is still larger than the actual linewidth due to phase noise of the spectrum analyzer. Theory suggests that the harmonics have comparable magnitude up to terahertz frequencies, while the observed roll-off is caused by a shunting capacitance in detection circuitry.

Original language	English
Article number	241102
Journal	Applied Physics Letters
Volume	101
Issue number	24
DOIs	https://doi.org/10.1063/1.4769982
State	Published - Dec 10 2012

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10.1063/1.4769982

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title = "Observation of 200th harmonic with fractional linewidth of 10-10 in a microwave frequency comb generated in a tunneling junction",

abstract = "A microwave frequency comb with up to 200th harmonic of a laser repetition rate is generated by nonlinear intermodal mixing of 15 fs laser pulses in the junction of a scanning tunneling microscope. The highest harmonic has an output power of -146 dBm at 14.85GHz with a signal/noise ratio of 20dB and a measured linewidth of 1.2Hz, which is still larger than the actual linewidth due to phase noise of the spectrum analyzer. Theory suggests that the harmonics have comparable magnitude up to terahertz frequencies, while the observed roll-off is caused by a shunting capacitance in detection circuitry.",

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AU - Hagmann, Mark J.

AU - Taylor, Antoinette Jane

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PY - 2012/12/10

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N2 - A microwave frequency comb with up to 200th harmonic of a laser repetition rate is generated by nonlinear intermodal mixing of 15 fs laser pulses in the junction of a scanning tunneling microscope. The highest harmonic has an output power of -146 dBm at 14.85GHz with a signal/noise ratio of 20dB and a measured linewidth of 1.2Hz, which is still larger than the actual linewidth due to phase noise of the spectrum analyzer. Theory suggests that the harmonics have comparable magnitude up to terahertz frequencies, while the observed roll-off is caused by a shunting capacitance in detection circuitry.

AB - A microwave frequency comb with up to 200th harmonic of a laser repetition rate is generated by nonlinear intermodal mixing of 15 fs laser pulses in the junction of a scanning tunneling microscope. The highest harmonic has an output power of -146 dBm at 14.85GHz with a signal/noise ratio of 20dB and a measured linewidth of 1.2Hz, which is still larger than the actual linewidth due to phase noise of the spectrum analyzer. Theory suggests that the harmonics have comparable magnitude up to terahertz frequencies, while the observed roll-off is caused by a shunting capacitance in detection circuitry.

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JO - Applied Physics Letters

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Observation of 200th harmonic with fractional linewidth of 10-10 in a microwave frequency comb generated in a tunneling junction

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Observation of 200th harmonic with fractional linewidth of 10^-10 in a microwave frequency comb generated in a tunneling junction