| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
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 |
|
|
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. |
|
|
151
|
Mon Jun 7 19:24:04 2010 |
tarac | Laser | Laser | RefCav is locked | RefCav
is locked , the beam is more stable than yesterday |
|
|
153
|
Tue Jun 8 20:16:21 2010 |
tarac | Laser | Laser | scanning ACav | Now I'm
working on aligning the beam into ACav. I
got the reflected light on the PD, and I'll |
|
|
157
|
Thu Jun 10 00:21:15 2010 |
tarac | Laser | Laser | scanning ACav | I'm
scanning the laser to align ACav. It's a
long day of adjusting 4 knobs and 1 lens |
|
|
158
|
Fri Jun 11 01:04:42 2010 |
tarac | Laser | Laser | scanning Acav2 | From yesterday,
after getting TEM 00 out of the cavity, I |
|
|
160
|
Mon Jun 14 10:16:54 2010 |
tarac | Misc | Other | weird TF from PMC servo | Since the
VCO has been borrowed, I decide to work on
RefCav path again. To optimize the RefCav |
|
|
161
|
Tue Jun 15 09:44:56 2010 |
tarac | Electronics | | PMC servo TF |
The weird TF result from PMC seems to be
the result of the insufficient voltage input. |
|
|
163
|
Tue Jun 15 13:36:18 2010 |
tarac | Electronics | | debugging PMC servo | From the
bode plot, something is not quite right.
I'll debug the PMC servo. My plan is |
|
|
168
|
Wed Jun 16 19:43:00 2010 |
tarac | Laser | PMC | PMC and EOM alignment | We try
optimizing the PMC transmission in P wave. |
|
|
170
|
Mon Jun 21 19:19:12 2010 |
tarac | Laser | PMC | Progress on PSL setup: Tuning phase shift/RF power for PMC | All SMA cables for locking
RefCav are made and wired up in their places. |
|
|
174
|
Wed Jun 23 23:52:48 2010 |
tarac | Laser | RefCav | RefCav is locked and optimized | I adjust
the mode matching lenses and align the beam
so that the transmitted power is |
|
|
176
|
Fri Jun 25 18:27:59 2010 |
tarac | Laser | Laser | mode matching to ACav | The new driver for
AOM is working, the maximum power is ~1.3w. |
|
|
177
|
Mon Jun 28 19:06:40 2010 |
tarac | DailyProgress | PMC | PMC acting weird | This morning,
the PMC couldn't be locked to the laser.
The FSS servo was disabled during that time. |
|
|
182
|
Tue Jun 29 14:20:04 2010 |
tarac | Notes | Laser | Calibration [Hz/V] for modulating signal (PMC and laser) | 1) DC ext channel
on PMC servo: |
|
|
186
|
Tue Jun 29 17:57:40 2010 |
tarac | Notes | PMC | coupling eff vs Temperature | We had a problem with power coupling
efficiency to the PMC. Sometime it |
|
|
187
|
Tue Jun 29 23:56:38 2010 |
tarac | Notes | PMC | PMC servo debugging | I
was going to check the TF on each stage of
PMC's servo. |
|
|
191
|
Wed Jun 30 12:31:22 2010 |
tarac | HowTo | PMC | PMC fixed |
|
|
|
194
|
Wed Jun 30 23:26:27 2010 |
tarac | DailyProgress | RefCav | Debugging FSS servo+Locking RefCav | summary of this
entry |
|
|
210
|
Mon Jul 12 14:32:49 2010 |
tarac | Summary | RefCav | RCTRANSPD RIN | Before, when we tried to lock the
cavity, it seemed that the gain was too |
|
|
313
|
Fri Aug 27 20:08:56 2010 |
tarac | Notes | NoiseBudget | COMSOL | I use COMSOL to simulate the
temperature distribution inside the mirror.
The mirrors are separate into 3 regions |
|
|
373
|
Tue Oct 26 16:20:03 2010 |
tarac | Notes | Laser | the laser is broken | The current
1064nm, 100 mW laser in our setup, NPRO lightwave |
|
|
378
|
Tue Nov 2 17:51:31 2010 |
tarac | Notes | Laser | the laser is broken | Frank opened up the laser to find any burnt
mark, but found nothing and put it back,
and now the laser is working. |
|
|
1761
|
Mon Nov 7 19:26:33 2016 |
yinzi | DailyProgress | TempCtrl | Testing driver circuit | After troubleshooting some supply power
problems (apparently the top and bottom half
of the breadboard power strips aren't |
6x |
|
1766
|
Tue Nov 8 18:22:07 2016 |
yinzi | DailyProgress | TempCtrl | driver circuit update | So after testing out the LT1012 op amp
in many simple configurations and not having
any of them work (and the measurements were |
|
|
1768
|
Mon Nov 14 17:03:06 2016 |
yinzi | DailyProgress | TempCtrl | frequency response and noise measurements | Here is the data that was taken last week
on the driver circuit.
At first there was a LF356 chip |
8x |
|
1773
|
Tue Nov 22 13:46:29 2016 |
yinzi | DailyProgress | TempCtrl | Circuit updates | The burning last time came from the load
resistor, which wasn't rated for high
power. I made a test load from resistive |
|
|
1779
|
Wed Nov 30 15:29:06 2016 |
yinzi | DailyProgress | TempCtrl | Circuit updates: Heater driver moved to protoboard, some data | I finished up taking frequency response
and noise data on the circuit on the breadboard,
swapped out the AD743s with OP27s and took |
14x |
|
1790
|
Tue Dec 13 13:07:58 2016 |
yinzi | DailyProgress | TempCtrl | driver board update | I finished soldering together the other
two channels for temperature control. This
is what the board looks like now: |
|
|
1805
|
Sun Jan 8 14:43:50 2017 |
yinzi | DailyProgress | TempCtrl | circuit board update and measurements | Andrew switched out the bypass capacitors
to ceramic ones over break. Now all of the
channels are functional, so I guess that |
7x |
|
1808
|
Tue Jan 10 16:40:28 2017 |
yinzi | DailyProgress | TempCtrl | beginning integration on temperature control | We did some more hardware integration for
the temperature control loop yesterday. We
first added a new input channel and a new |
|
|
1809
|
Tue Jan 10 16:48:06 2017 |
yinzi | Notes | TempCtrl | Heater driver circuit board pin assignments | The pin assignments for the heater driver
circuit board are as follows:
|
|
|
1813
|
Wed Jan 11 22:00:49 2017 |
yinzi | DailyProgress | TempCtrl | temperature control loop | So the loop itself is functional now (in
terms of all the hardware and software interfacing),
but the metal block didn't actually heat |
|
|
1817
|
Sat Feb 4 17:01:22 2017 |
yinzi | DailyProgress | TempCtrl | PID Autotuning work-in-progress | I started playing around with simulating
an attempt to automate PID tuning using the
Ziegler Nichols method (using this as a reference: |
|
|
1818
|
Wed Feb 22 17:21:36 2017 |
yinzi | DailyProgress | TempCtrl | troubleshooting temp sensor reading | The temperature sensor reading is being
railed to the negative power voltage whenever
a new input command is entered: |
|
|
1822
|
Sat Mar 4 17:01:00 2017 |
yinzi | DailyProgress | TempCtrl | npn transistor buffer and metal piece measurements | So I put together a little test circuit
to test out a NPN BJT buffer circuit with
a TIP122 transistor and an OP27 op amp. Power |
6x |
|
1835
|
Sun Apr 9 18:10:36 2017 |
yinzi | DailyProgress | TempCtrl | more TempCtrl circuit debugging | Tried separating the power to the sensor
circuit board from the driver circuit board
(so the only connection they share is ground). |
6x |
|
1838
|
Mon Jun 5 13:56:52 2017 |
yinzi | Notes | DAQ | Acromag noise measurements | Measured the acromag noise (input and output).
For the input noise, a function
generator was set up to input a sin signal |
|
|
1839
|
Mon Jun 12 13:48:45 2017 |
yinzi | DailyProgress | TempCtrl | testing heater circuit on test bench | I moved the circuits to the electronics
lab to test it there, and I recreated the
situation that was occuring in the lab. I |
|
|
1754
|
Thu Nov 3 21:11:15 2016 |
yinzi, awade | DailyProgress | Other | Mixed updates | Andrew and I did some stuff in the lab
today:
-Taped up the cavity and added |
|