Notes/Informations

Frequency-Comb Hannover

Channel	Measured	Frequency	Sign	Interval	Max outliers (Alarm)	F(x)
CH1	IQ-Resonator (R1) vs. Comb	29.347 MHz	-	±1 kHz	500 Hz	-fx
CH2	CEO	20 MHz	-	±2 Hz	0.15 Hz	-fceo
CH3	Reprate/16	6.250001 MHz	±0.002 Hz	0.001 Hz	frep/16
CH4	Link vs. Comb	22.432 MHz	-	± 300 Hz	500 Hz	-fy
CH5	Virtualer Beat (Link vs. IQ-Laser)	21,27143 MHz	± 20 Hz	10 Hz	fv
CH6	Manypoint-AOM	36 MHz	±5 Hz	10 Hz
CH7	Stell-AOM vom IQ-Laser	35.02865 MHz	±100 kHz	2000 Hz (+ correction of Offset)	f_Stell
CH8	Rubidiumuhr referenziert auf GPS	10 MHz	±0.002 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

Virtuel-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