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???????????????????

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Title: ???????????????????


1
?????????????????????????????
?? ?, ?? ??, ?? ?? ???? ?????? ?????
2
??
??
DECIGO???????????????
  • DECIGO????????????
  • ??????
  • 1 Hz/Hz1/2
  • ?????
  • 110-8 /Hz1/2

??1Hz?
  • ?????????????????????????

????????????????
  • ?????
  • 310-7 /Hz1/2
  • ??????
  • 20 Hz/Hz1/2

????
????????????????????????
?????410-8/Hz1/2 _at_1kHz(??)?5Hz/Hz1/2 _at_80Hz(???)
3
1. ????????? 1.1 DECIGO 1.2 ?????????? 1.3
??????????? 2. ?? 3. ?? 4. ?????
4
1.1 DECIGO
Deci-hertz Interferometer Gravitational Wave
Observatory
  • ???1 m
  • ???100 kg
  • ????10
  • ??1000 km
  • ??????10 W
  • ??????532 nm
  • 0.1Hz1Hz?????????????
  • (LISA??????????????)
  • ????BH???????????

?????????(100Hz)????????????
DECIGO?????????????????
5
1.2 ??????????
???????????????????????
?????
?????????????????????????????
FP?????? ??????????????
??????
2??FP?????????????????????
???????????????????????
??TAMA?????
TAMA??????????? p56
6
1.3 ???????????
  • ?????????????????
  • ?????????????
  • ??????????????????
  • ?????????????????????
  • ???????????????????

???????????
  • ??????????
  • ???????
  • ?????????

????????????? ?????
??????????????????
7
1. ????????? 2. ?? 3. ???? 4. ?????
2.5 ????????(??????) 2.6 ???Michelson??? 2.7
??????? 2.8 ??????
2.1 ????? 2.2 ?????? 2.3 ?????? 2.4 ??????
8
2.1 ?????
  • ?????
  • PD?????????
  • AOM(??????)?????????
  • ??????????????
  • PD???????????IC(AD587)
  • ????
  • AOM?????????
  • ???????????????
  • ???0.62???????
  • ??????????
  • 3.710-8/Hz1/2

9
2.2 ??????
  • ???Michelson???????
  • ??????
  • ???Michelson???????
  • ??????????????????
  • ??????????????
  • ??????????
  • ???????????????????

10
2.3 ??????
  • ??????????????????????????
  • ?????????
  • ??????????Michelson????
  • ??????????PZT???????????????

11
2.4 ??????
Laser power, 10mW Shot noise limit of IMS,
3.710-8/Hz1/2
12
2.5 ????????(??????)
  • ??????????????????

??????????????????????????????????
  • ??????
  • ???????????
  • ????????

????????
13
2.6 ???Michelson???
  • ???????????????????????
  • ????????????
  • ???????????????????

10cm
14
2.7 ???????
???Michelson?????????????????
  • ???????
  • 2????
  • Eddy current damping
  • ???????(10Pa)

15
2.8 ??????
50cm
16
1. ????????? 2. ?? 3. ???? 4. ?????
3.1 ??????? 3.2 ??????? 3.3 ???
17
3.1 ???????
(a) Free-run (b) ??? (c) ??????? (d) 610-7/f
(e) (c)?(d)??
????
  • ??310-7/Hz1/2_at_1Hz
  • ????????310-7/f1/2?????????
  • (310-7/f1/2??????)
  • ????????????
  • ????AOM driver????

???????????????
1Hz?50dB??????(???????????? )
18
3.2 ????????
(a) Free-run (b) ??? (c) ???(???)
????
  • ?? 20Hz/Hz1/2_at_1Hz
  • ???5Hz/Hz1/2
  • 200Hz?????????
  • ???????
  • ?????????
  • ??????
  • 110Hz?????????????????
  • ?????????
  • ???????
  • 1Hz?????????
  • ???????????
  • ???????????
  • 1Hz?40dB??????
  • ????????????????????????????????
  • ???????(??)

????LISA????? 30Hz/Hz1/2 _at_1mHz1Hz
19
3.3 ????
??????
  • AOM???????????
  • ???????Preamp?
  • ????????
  • ??????????????

?????
  • ??????????????
  • ?????
  • ???????????
  • 1.1Hz(????)
  • 1.6Hz(z??)
  • 3.5?3.6Hz(Yaw?Pitch??)
  • ???
  • ??????????
  • 10-2Hz/Hz1/2??

20
1. ????????? 2. ?? 3. ???? 4. ?????
21
4.1 ?????
  • ??????????????????????
  • ?????
  • ?????
  • 310-7 /Hz1/2
  • ??????
  • 20 Hz/Hz1/2

_at_1Hz
  • ???????????

?? AOM?????????
?????????????????????????
??? ??????????
  • ??
  • AOM??????????
  • ???Michelson????????????????????????
  • ???????????
  • ??????????

22
?
23
2.3 ????(1)
?? DFB????????? (KOHERAS?) ?? 10mW ??
1550nm, ?? lt23kHz ????? 30pm (PZT???)
????? 13pm/K
????? (AOM) ???????????? (BRIMROSE?) RF???
55MHz 1????? ???? 80 (?????)
????? 70 (???)
24
????(2)
Photo detector
Isolator
Beam splitter
25
2.7 ????????????
  • ????????????????????????
  • ?????????????????
  • ???????100m???????

Before
After
26
2.7 ?????servo????????????
1?????????, DC gain55dB, UGF40kHz, ????45
??? ? ???
27
2.8 ??????servo?????
1??2???????????? DC gain85dB, UGF2.3kHz,
????45
??? ? ???
28
2.9 ??????servo????????????
1?????? DC gain70dB, UGF2.6kHz, ????90
??? ? ???
29
3.2 ?????????
Shot noise Pre amp PD
offset ????
Free run (Monitor signal)
Stabilized
???
30
3.5 ??????????
Shot noise offset 1 Pre amp
offset2 PD 1
???? PD 2
104
103
???
Free run
102
Stabilized
101
100
10-1
10-2
100
101
102
103
104
10-1
31
?????????
???????(????????)
??????
????
????
???????(??????)
5.2
Arm-length noise m/Hz
10-8
UGF??????????
10-9
1/2
10-10
10-11
10-12
??????4Hz/Hz1/2
10-13
10-14
32
?????????
Arm-length noise m/Hz
5.2
10-9
Free run
?????????
10-10
1/2
10-11
10-12
10-13
Stabilized
10-14
???
10-15
33
?????????
????
110m???
???????
104
  • 10Hz100Hz???????????????
  • 1Hz?????????????
  • 10m?110m?????????????

103
102
101
100
10-1
10-1
100
101
102
103
104
34
3.4 ????????(2)
100Hz/Hz1/2_at_1Hz
104
Free run
103
??????????
102
Stabilized
101
???
100
??????5Hz/Hz1/2
10-1
UGF
10-2
100
101
102
103
104
10-1
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