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Notes/Informations

Frequency-Comb Hannover

Channel Measured Frequency Sign Interval (axis) Max outliers (Alarmschwelle) F(x)
CH1 IQ-Resonator (R1) vs. Comb 29.347 MHz - ± 900 Hz 500 Hz -fx
CH2 CEO 20 MHz - ± 0.24 Hz 0.15 Hz -fceo
CH3 Reprate/16 6.250001 MHz ± 0.0018 Hz 0.001 Hz frep/16
CH4 Link vs. Comb 22.432 MHz - ± 900 Hz 500 Hz -fy
CH5 Virtualer Beat (Link vs. IQ-Laser) 21,27173 MHz ± 18 Hz 10 Hz fv
CH6 Manypoint-AOM 36 MHz ±18 Hz 10 Hz
CH7 Stell-AOM vom IQ-Laser 35.0X MHz ± 4000 Hz 2000 Hz (+ correction of Offset) f_Stell
CH8 Rubidiumuhr referenziert auf GPS 10 MHz ± 0.0018 Hz 0.001 Hz
  • Modenverhältnis: Ratio: N=n916/nLink = 3275292/1944000 = 1.684820987654321…
  • Repetitionsrate: 100,0000226 MHz

  • AOM (+77.111 MHz) used for atom-lock + fiber stabilization(5m)
  • AOM (+80.111 MHz) used for fiber stabilization(30m)
  • Double-pass AOM (-2*102,XX MHZ) used for spectroscopy (frequency shift), feedback-loop!!!
  • Channel 7 = 138 MHz (Synthesizer, referenced by 10 MHz GPS) - Double-pass AOM
  • Atom frequency: nu_opt(Mg = ( 3275292*col(e)*16 - 2*col(d) - col© + 80,111e6)*2 + 77,111e6
  • Laserfrequency: f_laser = 3275292*frep*16 - 2*fceo - fx
  • Resonator 1 frequency: f_R1 = 3275292*frep*16 - 2*fceo - fx + (-2*f_AOM_R1)
  • Double-pass AOM: f_AOM_R1 = 138 MHz - f_Stell

Virtual-Beat

  • fv = (fy + fceo) - ( (fx + 2*fceo) / (3275292/1944000) ) + (2*10 MHz)

Evaluation (PTB)

  • fx= col© (#1, negatives fx)
  • fceo=col(d) (#2) (negatives fceo)
  • frep=col(e) (#3, frep/16)

Test analysis

  • nu_opt(Mg) - nu_(Mg2015)[Hz] = nu_opt(Mg) - 655058646691000

→ nu_opt(Mg) - nu_(Mg2015)[Hz] = ( f_laser + 80,111e6)*2 + 77,111e6 - 655058646691000

Frequency-Comb Braunschweig

Clocks hight in respect to the geoid

In front of the university are studs, which which are used as a reference. The PDF where everything is explained is given by Dr. Heiner Denker (Institut für Erdvermessung (IFE)), he will also estimate the experiments hight witch higher precision soon. afisbuchnachweis362400016.pdf