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Entry  Fri May 9 11:23:11 2014, steve, Update, Green Locking, decreased X green light power  
    Reply  Fri May 9 21:18:51 2014, Koji, Update, Green Locking, Reverted X green light power  
Message ID: 9939     Entry time: Fri May 9 21:18:51 2014     In reply to: 9937
Author: Koji 
Type: Update 
Category: Green Locking 
Subject: Reverted X green light power  

It is actually very tricky to measure the green power at the output of the doubling crystal as the IR often leaks into the measurement.
I checked the green beam powers on the X/Y/PSL tables.

CONCLUSION: There is no green beam which exceeds 5mW anywhere in the 40m lab.

Note: The temperature of the doubling crystal at the X end was optimized to have maximum green power. It was 36.3degC and is now 36.7degC.

X END:

When the angles of the wave plates are optimized, we have 539mW input to the doubling crystal.
With the Xtal temperature of 36.7degC, where the green power is maximized, the power right after
the harmonic separator (H.S.) was 9.6mW.

Xtal temp 36.7degC   ~~~
                      |

--539mW@IR-->{Xtal}-->/-->9.6mW-->{Mirror}-->4.69mW-->{Mirror}-->4.54mW-->{Faraday}
                    (H.S.)

If we believe these 4.69mW and 4.54mW are purely from the green, we have 4.8mW right after the H.S.
This corresponds to the conversion efficiency of 1.6%/W (cf. theretical number 2%/W)

By disabling the heating of the crystal, we can reduce the green light by factor of 60. But still the reading right after the H.S. was 5.3mW

Xtal temp 29.2degC   ~~~
                      |
--539mW@IR-->
{Xtal}-->/-->5.3mW-->{Mirror}-->285uW-->{Mirror}-->74.3uW-->{Faraday}
                    (H.S.)

Naively taking the difference, the green beam right after the H.S. is 4.4mW.

In either cases, the green power right after the oven is slightly less than 5mW.

Y END:

When the angles of the wave plates are optimized, we have 287mW input to the doubling crystal.
With the Xtal temperature of 36.0degC, where the green power is maximized, the power right after
the harmonic separator (H.S.) was 0.86mW.

Xtal temp 36.0degC   ~~~
                      |

--287mW@IR-->{Xtal}-->/-->0.86mW-->
                    (H.S.)

When the temperature was shifted to 39.2degC, the reading after the H.S. was 70uW. Therefore the contamination by the IR is small
in this setup and we can believe the above reading in 70uW accuracy. This 0.86mW corresponds to the conversion efficiency of 1.2%/W.

PSL

The incident IR is 80mW. We have 170uW after the H.S., which corresponds to the conversion efficiency of 2.6%/W. Maybe there is some IR contamination?
From the vacuum chamber total 1mW of green is derivered when both arms are locked and aligned.

Thus the total green power at the PSL table is less than 5mW.

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