| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
101
|
Sun Apr 11 21:04:08 2010 |
Frank | Misc | RefCav | heating power requirement | measured the power required to heat the
new chamber to ~40C in order to design the
driver circuit. |
|
|
102
|
Mon Apr 12 10:57:33 2010 |
Tara Chalermsongsak | Laser | Laser | Correction for higher order mode frequency | Last time, the calculated beam waist I
got was based on two identical mirrors with
no reflecting coating layers on the back |
|
|
103
|
Mon Apr 12 11:04:15 2010 |
Tara Chalermsongsak | Laser | Laser | PSL layout for new setup | The layout for the new PSL setup
( lenses, and their positions are to be calculated.)
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|
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104
|
Tue Apr 13 00:25:52 2010 |
Frank | Computing | DAQ | new RT frontend | have put everything together. right now
the frontend keeps bitching about one of
the disks used for the frames, even if this |
|
|
105
|
Tue Apr 13 14:50:39 2010 |
Frank | Computing | DAQ | new RT frontend |
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|
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106
|
Tue Apr 13 15:06:35 2010 |
Tara Chalermsongsak | Laser | RefCav | HOM, from carrier and both sidebands | HOM frequency shift for RefCav is plotted
below. The second one has clearer dots.
Y axis is the frequency shift in |
|
|
107
|
Tue Apr 13 18:23:41 2010 |
Tara Chalermsongsak | Electronics | | TF of PDH Box | I measured TF of PDH box, D0901351, (The
one we have was modified). This box sends
the signal to VCO. |
|
|
108
|
Thu Apr 15 16:42:32 2010 |
Frank | Electronics | RefCav | AD590 readout-box modified | in order to gain more s/n ratio i modified
the existing AD590 readout-box a little bit.
I assumed that we wanna operate the cavity |
|
|
109
|
Fri Apr 16 10:45:04 2010 |
Tara Chalermsongsak | Electronics | | Control Loop for PSL | This is the control loop for the current
PSL setup.
There are still components to be |
|
|
110
|
Wed Apr 21 15:21:52 2010 |
Tara Chalermsongsak | Electronics | | TF of PDH Box | I calculated the TF of the modified PDH
box and fit it with the measurement. The
comparison does not match perfectly. I'll |
|
|
111
|
Wed Apr 21 15:39:46 2010 |
rana | Electronics | | TF of PDH Box |
Use LISO for circuit simulation. |
|
|
112
|
Sun May 2 19:18:36 2010 |
Frank | Misc | RefCav | reference cavity moved to new chamber | i finally moved the reference cavity to
the new chamber and pump it since Friday.
The legs are now insulated and it comes with |
|
|
113
|
Mon May 3 15:47:58 2010 |
Tara Chalermsongsak | Electronics | | TF of PDH Box | The values of some r
and c in the circuit are corrected, I used
wrong values last time ( details will be |
|
|
114
|
Tue May 4 03:40:00 2010 |
rana | Laser | RC noise | updated noise budget | code is in SVN |
|
|
115
|
Thu May 6 00:05:29 2010 |
Frank, Jan | Computing | RC noise | comsol/matlab model | We finished
the first comsol model which where we can
modify the geometry automatically. The problem |
|
|
116
|
Thu May 6 11:01:03 2010 |
Frank | Misc | RC noise | model now in the svn | i created
a folder "frank" in the 40m-svn.
It currently contains a subfolder "comsol" |
|
|
117
|
Fri May 7 15:51:43 2010 |
Frank | Misc | RefCav | updated schematic for new setup | |
|
|
118
|
Mon May 10 00:29:04 2010 |
Frank | Misc | RefCav | ion pump current still too high | i checked the current of the ion pump.
It's still at 75uA, much too high. So i think
i have a tiny leak somewhere but i can't |
|
|
119
|
Tue May 11 22:26:34 2010 |
Tara Chalermsongsak | Laser | Laser | Beam waist measurement |
I measured the beam waist of Lightwave
NPRO 1064nm 100mW with WinCamD. |
|
|
120
|
Wed May 12 22:10:13 2010 |
Tara Chalermsongsak | Laser | Laser | Beam waist measurement | I measured the beam waist again. The laser
was operated at full power ~100mW. A mirror
attenuated the beam to 60 uW and ND |
|
|
121
|
Thu May 13 13:41:32 2010 |
Tara Chalermsongsak | Laser | Laser | mode matching from laser to PMC |
|
|
|
122
|
Thu May 13 20:56:57 2010 |
Frank | Laser | Laser | 100mW NPRO problems | we still have serious problems with the
100mW laser head. I traced it down to the
connection between the PCB and the hermetically |
|
|
123
|
Mon May 17 21:32:35 2010 |
Tara Chalermsongsak | Laser | Laser | PMC alignment | I'm trying to align the PMC. The
transducer is connected to the PMC servo
card's HV out. |
|
|
124
|
Tue May 18 15:21:12 2010 |
Tara Chalermsongsak | Laser | Laser | PMC alignment |
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|
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125
|
Wed May 19 00:18:45 2010 |
Tara Chalermsongsak | Laser | Laser | PMC alignment | After checking the PMC servo card,
ramp signal goes to ext DC
HV in is applied properly, |
|
|
126
|
Thu May 20 21:50:35 2010 |
tarac | Laser | Laser | PMC is almost ready to be locked | We still need two SMA cables. One
connects between 21.5Mhz EOM and PMC servo
card, another one connects between PMC PD |
|
|
127
|
Mon May 24 09:56:19 2010 |
rana | Laser | PMC | PMC is almost ready to be locked | You should make sure not to blow up
the PMC PD: i.e. the total power on the
PD out of lock should be less than 100 |
|
|
128
|
Mon May 24 19:30:15 2010 |
rana | Laser | PMC | PMC is almost ready to be locked |
|
|
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129
|
Mon May 24 19:40:12 2010 |
tarac | Laser | Laser | Ref Cav prealignment |
Dear elog
I don't know why I can't lock |
|
|
130
|
Tue May 25 17:01:57 2010 |
tarac | Laser | Laser | PMC cavity is locked | After adding
another 1/2 plate to have P wave into
the cavity, I can lock the PMC cavity. It's |
|
|
131
|
Wed May 26 21:11:00 2010 |
tarac | Laser | Laser | progress on PSL setup |
I add the broad band EOM in the beam
path. After adjusting the periscope, I can |
|
|
132
|
Thu May 27 11:18:51 2010 |
tarac | Laser | Laser | Schematic for FSS servo and Lightwave 126 1064 100mW | This is the schematic of PSL fss servo.
I have to make sure that the modulation
voltage will not exceed the controller's |
|
|
133
|
Thu May 27 18:20:42 2010 |
tarac | Laser | Laser | Aligning RefCav | I switched the cable from the 10W controller
to the original controller for 100 mW laser.
It is working well now, the cables are tied |
|
|
134
|
Fri May 28 20:46:14 2010 |
tarac | Laser | Laser | Progress on PSL: Aligning RefCav | Since the frequency of the laser
going into RefCav is determined by PMC ,I
decided to temporarily remove the PMC for |
|
|
135
|
Sat May 29 12:01:17 2010 |
Frank | Laser | Laser | Progress on PSL: Aligning RefCav |
|
|
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136
|
Sun May 30 22:49:28 2010 |
tarac | Laser | Laser | RefCav is locked | I see TEM00 transmitted beam out of RefCav.
I think I have to fine tune the FSS gain
a bit more becasue the spot still oscillates |
|
|
137
|
Tue Jun 1 07:39:47 2010 |
Frank | Laser | Laser | RefCav is locked |
|
|
|
138
|
Tue Jun 1 14:16:00 2010 |
tarac | Laser | Laser | PSL setup: next step | This is the schematic for PSL setup.
http://131.215.115.52:8080/PSL_Lab/117
At this point, Pre Mode Cleaner (PMC) |
|
|
139
|
Tue Jun 1 19:26:41 2010 |
tarac | Laser | Laser | A mirror gets into the insulation's border | I'm aligning the AOM. The R=0.5m mirror's
position crosses the insulation border by
1.5" (see attached picture.) The black |
|
|
140
|
Thu Jun 3 00:52:37 2010 |
tarac | Laser | Laser | Aligning AOM | I'm aligning the AOM and maximizing
the diffracted beam's power by positioning
the AOM and adjusting the beam size by moving |
|
|
141
|
Thu Jun 3 08:42:44 2010 |
Frank | Laser | Laser | Aligning AOM |
|
|
|
142
|
Thu Jun 3 14:47:58 2010 |
Frank | Laser | Laser | Aligning AOM |
|
|
|
143
|
Thu Jun 3 15:45:39 2010 |
Frank | Laser | Laser | Aligning AOM |
|
|
|
144
|
Thu Jun 3 22:00:21 2010 |
Frank | Laser | Laser | Aligning AOM |
|
|
|
145
|
Thu Jun 3 23:55:38 2010 |
tarac | Laser | Laser | Aligning AOM 2: the Return of the Beam | I'm aligning
double pass AOM. After maximizing the power
of the 1st order of the transmitted beam, |
|
|
146
|
Fri Jun 4 00:03:17 2010 |
Jenne | Computing | Environment | Spam |
|
|
|
147
|
Fri Jun 4 22:10:24 2010 |
tarac | Laser | Laser | progress on PSL setup | The maximum
power after AOM double pass is 37%, worse |
|
|
148
|
Fri Jun 4 22:48:24 2010 |
rana | Laser | Laser | progress on PSL setup |
|
|
|
149
|
Sat Jun 5 16:17:05 2010 |
Koji | Computing | Environment | Spam | There is a trick to put a message on top.
1. Change "Encoding" below |
|
|
150
|
Sun Jun 6 23:01:58 2010 |
tarac | Laser | Laser | RefCav is almost locked | When I
try to lock the cavity, it's not very stable
yet. The transmitted power fluctuates alot. |
|