3.レーザー冷却・トラップ ... - ltm.kyoto-u.ac.jp · PDF...

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Transcript of 3.レーザー冷却・トラップ ... - ltm.kyoto-u.ac.jp · PDF...

(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