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


Page archived content (Before Oct 8 2014)

Right now we use cheapo diode lasers.

We may in the future use HeNe lasers:

http://www.mi-lasers.com/he-ne.html

Suspensions/40m_Optical_lever_lasers (last edited 2017-06-24 01:38:48 by GautamvenugopalanATligoDOTorg)