3．レーザー冷却・トラップ ... - ltm.kyoto-u.ac.jp · PDF...
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(i)
v
E2
E1
12 EE
(i)
v
E2
E1
12 EE
v=0
E2
E1
22 11
1211 )1( EEc
v
1222 )1( EEc
v
(i)
v
E2
E1
12 EE
v=0
E2
E1
22 11
1211 )1( EEc
v
1222 )1( EEc
v
12TTk DB
23Na TD=240 K
F=aV
http://www.colorado.edu/physics/2000/
(ii) Magneto-Optical Trap:MOT)
laser
coil
coil
I
I
(=
(ii) Magneto-Optical Trap:MOT)
laser
coil
coil
I
I
(=
+1
m
J = 1
J = 0
0
1
E
s
laser
frequency
E1
E2
s
x
MOT
Magneto Optical Trap (MOT)
CCD
anti-Helmholtz
coils
laser for MOT
= 108
T=12K 10mm
MOT
)(
EpV int Ep :
2
)()(
2
0 0
int
rEpdEdVrU
E E
pot
virtual
2
)(
EpV int Ep :
2
)()(
2
0 0
int
rEpdEdVrU
E E
pot
/2
Optical Trap (FORT)
1mm
MOT
.
Sisyphus)
M
kTk RB
2
)( 2
TR ~ 100 nK
Sisyphus)
P(
=
:
Thermalization
(
: : :
Evaporation
Evaporative Cooling(
: : :
http://www.colorado.edu/physics/2000/
Demagnetization Cooling
: :
::
[W. J. De Haas, et al., (1934)]
(1G)
(50mG)
[Pomeranchuk, (1950)]
3He Osheroff, Lee, Richardson
[Pomeranchuk, (1950)]
s ~ kB2T/TF
3He
:
s ~kBln(N)
3He
N=6
133Cs) 9192631770
m1/299792458(s)
c=299,792,458 m/s
T
1~
g
vT 02
T:
mg
vLsTsmv 3.1
2,1/5
2
00
(10-14)
769 nm
698 nm
87Sr
698 nm
56 m
87Sr
24 km
2
769 nm
1538 nm
2
87Sr
60km
hvmc 2 zgc
hvzmgE
2
cmz 1@ 1810
f
f
E
E
f (N
ICT
)
f (
) (H
z)
hvmc 2 zgc
hvzmgE
2
cmz 33@ 181033
f
f
E
E
