Optical Lever Improvement Project
Task Description |
Who |
Status |
Review LHO elogs for information on Optical lever Problems |
EG |
|
Review LLO elogs for information on Optical Lever Problems |
MT |
|
Meet with Suresh |
EG & MT |
Discussed |
Learn how to download data from Observatories and 40m |
|
|
Try to understand if the power normalization is working |
|
|
Download and analyze free space He-Ne Op lev data at 40m |
MT |
Retrieved data Sept23 to Oct 2 |
Fiber coupled He-Ne Op lev experiment at 40m |
|
|
Test the new fiber coupled He-Ne using the fiber power meter |
MT |
Do not have a FPM @633nm; Free space: 0.07mW |
Select and purchase adjustable fiber collimator |
MT |
Will be using Thorlabs CFC-2X-C for now |
Select and purchase mount for fiber collimator |
MT |
Available and ready |
Fiber coupled diode laser Op lev experiment at the 40m |
MT |
Setup on Oct15. Last data retrieved did not show enough resolution. Modify channels to 16bit ADC |
Trade between free space solution and fiber solution |
|
|
Make a design once a solution is selected |
|
|
Procurements list
Component |
Quantity needed/procured |
Part Number |
Order status |
Last updated |
Fiber coupled Diode laser |
1/1 |
|
Procured |
Oct 9 |
Kinematic fiber mount |
1/1 |
Unknown |
Available |
Oct 9 |
Fiber collimator |
1/1 |
Thorlabs CFC-2X-C |
Available |
Oct 9 |
Fiber collimator mount |
1/1 |
Thorlabs AD9.5F |
Available |
Oct 9 |
Oplev QPD circuit
D980325-C1 (added GV 23 Jun 17 - I believe the transimpedance resistance is 97.6k, see elog 9976)
Oplev QPD
Centronic QD-100-0 (added GV 23 Jun 17)
According to the datasheet, the typical (maximum) crosstalk between quadrants is 1% (5%), although this is quoted at 900 nm. This number should be kept in mind when trying to decouple PIT and YAW motions on the QPD.
References
LLO elogs
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=14809
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=13125
Page archived content (Before Oct 8 2014)
Right now we use cheapo diode lasers.
We may in the future use HeNe lasers:
