?????????????EIT???

1
?????????????EIT???

• ????,???A
• ????????A??????A?????A?????

2
??
??
?????????Cs?????????????????????????
??
EIT(Electromagnetically Induced Transparency)?????
??
?????????????????????????????
3
????
???????????????? ?????????????(?????)
0.3mm?0.5mm?1mm?2mm?5mm?40mm???????
4
EIT???
???????????
6P3/2
F4
3gt
Coupling
Probe
OC
OP
?1
?2
1gt
F4
6S1/2
2gt
F3
EIT??????Cgt?NCgt??????????????? ?????????????????
????????????????????????????
5
?????
coupling probe
Cs thin cell
coupling
Photo detector
E.O.M
l/4 plate
isolator
s
ECDL
attenuators
852 nm
Cs D2 line
AM
Synthesizer
Excited state
Lock-in amplifier
F4
9192MHz
Ref. 300 kHz
coupling
probe
Signal out
F4
9192 MHz
detuning d
F3
Ground state
6
??????Cs???EIT???????
?????1mm
????
Transmission (a.u.)
0
2
4
-2
-4
Probe detuning d (MHz)
7
????
???? ????
0.3 mm
0.5 mm
1 mm
150
125
100
FWHM (kHz)
75
50
25
0
40 mm
2 mm
5 mm
????EIT????????????????????
8
???????
???????
??????
?????
??
??
??
??
??????EIT??????????
????
????
Transmission (a.u.)
Transmission (a.u.)
Probe detuning d (a.u.)
Probe detuning d (a.u.)
????????????????????EIT???????????????????????????
?
?????????
NCgt??????????
9
??????
3gt
N3
?N
?
?C
NC
NN
NCgt
Cgt
??????????
????
??????????
D
atoms
????????(?????)
x
L
z
10
???????????
???????????Non-coupled state????????
????????????????????????????????NCgt??????????????
????????????????????????Maxwell-Boltzmann??????
11
?????
??
NCgt??????????
Lorentz ?
probe detuning
???????
power broadening ??
12
???????????
??? ????
0.3 mm
0.5 mm
1 mm
150
125
100
FWHM (kHz)
75
50
25
0
100
0
200
300
400
100
0
200
300
400
Intensity (mW/cm2)
Intensity (mW/cm2)
2 mm
5 mm
40 mm
EIT????????????????????????
13
??
?????????EIT??????power broadening?transit time
broadening???????????????
?????????????????????????????????????????????
?????????????EIT????????????????