components for high energy and average power
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ICAN Conference CERN Geneva Switzerland
June 27 & 28, 2013
Components for high energy and average power
1. Energy Handling
2. Average Power Handling
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High energy extraction from fibers
What happens to fibers at highest average power and energy?
If heat transfer is interrupted, fused silica can melt.
Too much energy.
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High energy extraction from fibers
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High energy extraction from fibers
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High energy extraction from fibers
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High energy extraction from fibers
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ICAN Conference CERN Geneva Switzerland
June 27 & 28, 2013
Components for high energy and average power
1. Energy Handling
2. Average Power Handling
![Page 8: Components for high energy and average power](https://reader036.vdocument.in/reader036/viewer/2022081402/629160f81440b002690c6fee/html5/thumbnails/8.jpg)
Average power
technology
chan
nel
co
un
t
320.000
3.200
32.000.000
320
Critical component: • Compressor efficiency • Average power handling
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Average power
Basics: Overall temperature change affects optical elements:
(thin lens)
Cool everything
Even housing! Tolerable temperatur change:
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Average power
Now: Thermal gradients due to beam profile .... • Usual Solution: athermal designs
o Passive designs by material combinations o Active solutions (focus shifting optics)
At extrem high power levels, athermal designs may fail. • Coating similar absorption than
bulk material.
AR Coating
~10 ppm
Fused silica: 10 ppm / cm
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Average power
Now: Thermal gradients due to beam profile .... • Usual Solution: athermal designs
o Passive designs by material combinations o Active solutions (focus shifting optics)
AR Coating
At extrem high power levels, athermal designs may fail. • Coating similar absorption than
bulk material.
~10 ppm
Fused silica: 10 ppm / cm
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Average power
Reflective Optics better?
AR Coating
~10 ppm
Fused silica: 10 ppm / cm
HR Coating
~40 ppm
Typical: thermal lens at absorption of some 10s of mW
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Average power
500 kW
AR Coating
~10 ppm
Fused silica: 10 ppm / cm
HR Coating
~30 ppm
15 W heat!!! 15 W heat!!!
100 ppm Transmission = 50 W Transparent substrate required, no backside cooling by metalls etc!
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Get the best AR or HR
Average power
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Average Power Handling
• Consider: Compressor Grating
• Traditional design (SiO2 with HR stack below grating) • 30 ppm absorption • Backside cooled
Deformation << beam divergence
Up to 75 kW possible
Average power
~ 1/L*dL/dT T
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ICAN Conference CERN Geneva Switzerland
June 27 & 28, 2013
Summary
We have to consider average power issues.
Other communities do as well: EH, GWD …
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Thank you for your attention!
ICAN Conference CERN Geneva Switzerland
June 27 & 28, 2013