Aerospace & Defense Technology - December 2023 - 28

RF & Microwave Technology
ler-Townes (AT) peaks, the microwave
field strength could be inferred. Because
atomic transitions lie at the heart of
this ingeniously simple experimental
scheme, it offers SI traceable and calibration
free electrometry.²
The decade following the original
Dr. Susi Otto, one of the University of Otago physicists involved in the demonstration, pictured here with
the portable Rydberg sensor created by researchers at the Dodd-Walls Centre. (Image: University of Otago)
nant with the transition between two
Rydberg states were measured by sending
counter-propagating blue and infrared
laser beams through the vapor cell.
In the absence of microwave radiation,
the blue coupling light would establish
Base Station
probe
(780 nm)
Sensing Unit
detector
beam
expander
spectrum
analyser
20
60
kHz
100
oscilloscope
∆c
Coupling
probe
∆p= 0
∆
Ωc
Ωp
5P
5S
49D5/2
48F7/2
18.14 GHz
19.84 GHz
50P 3/2
AM Signal
3/2
1/2
electromagnetically induced transparency
(EIT) for the infrared probe light,
while an incoming microwave field of
constant amplitude would split the EIT
transmission peak into two, and from
the peak separation of these two Aut1-30
m
retroreflector
work
of Sedlacek¹ et al. witnessed a number
of developments. For example, the
sensitivity of the on-resonant EIT/AT
technique can be greatly improved using
a superheterodyne receiver architecture
and an optical ground-state repumping
technique, making it possible to detect
fields down to 5 μV m−1. In the other
extreme, at large RF field strengths, the
AT splitting is no longer linear with the
strength of the applied field due to the
AC Stark shift, which scales as the field
strength squared. Instead, this shift can
be measured to infer the field strengths
of sufficiently large fields.
Measurements of the AC Stark shift
also allow detection of frequencies outside
the discrete set of atomic Rydberg
transitions extending the technique
to a continuous RF spectrum. Rydberg-atomic
systems for communication
constitute a particular application
that leverages the technique of Sedlacek
et al., and fundamental working principles
of analog and digital communication
have been demonstrated in a range
of atom-based systems.
Although the systems mentioned
above allow for a large variety of RF
measurements and applications, they
Figure 1: Schematic of the experimental setup. For clarity, the laser driver electronics and the setup for frequency stabilizing the lasers are not included in the
drawing of the base station.
28
mobilityengineeringtech.com
Aerospace & Defense Technology, December 2023
antenna
15-20 GHz
Coupling
(480 nm)

http://mobilityengineeringtech.com

Aerospace & Defense Technology - December 2023

Table of Contents for the Digital Edition of Aerospace & Defense Technology - December 2023

Aerospace & Defense Technology - December 2023 - Intro
Aerospace & Defense Technology - December 2023 - Sponsor
Aerospace & Defense Technology - December 2023 - Cover1
Aerospace & Defense Technology - December 2023 - Cover2
Aerospace & Defense Technology - December 2023 - 1
Aerospace & Defense Technology - December 2023 - 2
Aerospace & Defense Technology - December 2023 - 3
Aerospace & Defense Technology - December 2023 - 4
Aerospace & Defense Technology - December 2023 - 5
Aerospace & Defense Technology - December 2023 - 6
Aerospace & Defense Technology - December 2023 - 7
Aerospace & Defense Technology - December 2023 - 8
Aerospace & Defense Technology - December 2023 - 9
Aerospace & Defense Technology - December 2023 - 10
Aerospace & Defense Technology - December 2023 - 11
Aerospace & Defense Technology - December 2023 - 12
Aerospace & Defense Technology - December 2023 - 13
Aerospace & Defense Technology - December 2023 - 14
Aerospace & Defense Technology - December 2023 - 15
Aerospace & Defense Technology - December 2023 - 16
Aerospace & Defense Technology - December 2023 - 17
Aerospace & Defense Technology - December 2023 - 18
Aerospace & Defense Technology - December 2023 - 19
Aerospace & Defense Technology - December 2023 - 20
Aerospace & Defense Technology - December 2023 - 21
Aerospace & Defense Technology - December 2023 - 22
Aerospace & Defense Technology - December 2023 - 23
Aerospace & Defense Technology - December 2023 - 24
Aerospace & Defense Technology - December 2023 - 25
Aerospace & Defense Technology - December 2023 - 26
Aerospace & Defense Technology - December 2023 - 27
Aerospace & Defense Technology - December 2023 - 28
Aerospace & Defense Technology - December 2023 - 29
Aerospace & Defense Technology - December 2023 - 30
Aerospace & Defense Technology - December 2023 - 31
Aerospace & Defense Technology - December 2023 - 32
Aerospace & Defense Technology - December 2023 - 33
Aerospace & Defense Technology - December 2023 - 34
Aerospace & Defense Technology - December 2023 - 35
Aerospace & Defense Technology - December 2023 - 36
Aerospace & Defense Technology - December 2023 - 37
Aerospace & Defense Technology - December 2023 - 38
Aerospace & Defense Technology - December 2023 - 39
Aerospace & Defense Technology - December 2023 - 40
Aerospace & Defense Technology - December 2023 - Cover3
Aerospace & Defense Technology - December 2023 - Cover4
https://www.nxtbook.com/smg/techbriefs/24ADT09
https://www.nxtbook.com/smg/techbriefs/24ADT08
https://www.nxtbook.com/smg/techbriefs/24ADT06
https://www.nxtbook.com/smg/techbriefs/24ADT05
https://www.nxtbook.com/smg/techbriefs/24ADT04
https://www.nxtbook.com/smg/techbriefs/24ADT02
https://www.nxtbook.com/smg/techbriefs/23ADT12
https://www.nxtbook.com/smg/techbriefs/23ADT10
https://www.nxtbook.com/smg/techbriefs/23ADT09
https://www.nxtbook.com/smg/techbriefs/23ADT08
https://www.nxtbook.com/smg/techbriefs/23ADT06
https://www.nxtbook.com/smg/techbriefs/23ADT05
https://www.nxtbook.com/smg/techbriefs/23ADT04
https://www.nxtbook.com/smg/techbriefs/23ADT02
https://www.nxtbook.com/smg/techbriefs/22ADT12
https://www.nxtbook.com/smg/techbriefs/22ADT10
https://www.nxtbook.com/smg/techbriefs/22ADT09
https://www.nxtbook.com/smg/techbriefs/22ADT08
https://www.nxtbook.com/smg/techbriefs/22ADT06
https://www.nxtbook.com/smg/techbriefs/22ADT05
https://www.nxtbook.com/smg/techbriefs/22ADT04
https://www.nxtbook.com/smg/techbriefs/22ADT02
https://www.nxtbook.com/smg/techbriefs/21ADT12
https://www.nxtbook.com/smg/techbriefs/21ADT10
https://www.nxtbook.com/smg/techbriefs/21ADT09
https://www.nxtbook.com/smg/techbriefs/21ADT08
https://www.nxtbook.com/smg/techbriefs/21ADT06
https://www.nxtbook.com/smg/techbriefs/21ADT05
https://www.nxtbook.com/smg/techbriefs/21ADT04
https://www.nxtbook.com/smg/techbriefs/21ADT02
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