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Wed Apr 21 10:09:23 2010, kiwamu, Update, Green Locking, waist positon of Gaussian beam in PPKTP crystals
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Tue Apr 27 14:18:53 2010, kiwamu, Update, Green Locking, waist positon of Gaussian beam in PPKTP crystals
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Thu Jul 29 21:13:39 2010, Dmass, Update, Green Locking, waist positon of Gaussian beam in PPKTP crystals
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Thu Jul 29 22:58:25 2010, kiwamu, Update, Green Locking, waist positon of Gaussian beam in PPKTP crystals
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Fri Jul 30 00:02:15 2010, Dmass, Update, Green Locking, waist positon of Gaussian beam in PPKTP crystals
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Fri Jul 30 09:51:58 2010, kiwamu, Update, Green Locking, Re: waist positon of Gaussian beam in PPKTP crystals   
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Message ID: 3330
Entry time: Fri Jul 30 09:51:58 2010
In reply to: 3328
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Author: |
kiwamu |
Type: |
Update |
Category: |
Green Locking |
Subject: |
Re: waist positon of Gaussian beam in PPKTP crystals |
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Okay, I guess I understand what you want to know. I did the following steps.
1. calculated the conversion efficiency as a function of the waist size. I found w~50um was the optimum waist.
Note: the confocal relation Zr = pi * wo^2/(lamba/n) = L/2 gives us almost the same optimum waist.
elog #2735

2. Did mode matching to get w=50um
elog #2959
elog #3188


3. calculated the offset
elog #2850
4. Moved the ovens
Quote: |
I thought we cared about satisfying the confocal focusing parameter, that is to say we want to set Zr = 2L_crystal. If Zr changes inside the crystal, this is the number we care about..isn't it NOT the waist size, but the rayleigh range we care about? I am not entirely sure what youre response is saying you did...
- Calculate Zr = pi * wo^2/(lamba/n)
- Do mode matching to get this wo in free space
- Calculate the offset you need to move the oven by using n
- Move hte ovens
OR
- Calculate Zr = pi*wo^2/(lamba)
- Do mode matching to get this in free space
- Calculate the offset you need to move your ovens using n
- Move your ovens
I guess the waist size would also let me know - are you using 69 um or 53 um waist size?
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