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Technology / Re: What are the feature(s) in a FEL laser that defines the output frequency?
« on: 03/03/2019 21:20:58 »
"The geometry of the "wiggler" is also important - the length of the undulations. This tends to be fixed in iron and copper, so cannot be easily modified."
the purpose of the iron and copper is to create a magnetic field, the "features" of this magnetic field could me modified by designing it as a composite and use elctronics to switch the configuration:
NNNNSSSSNNNNSSSSNNNN...
NNSSNNSSNNSSNNSSNNSS...
NNNNNNNNNNSSSSSSSSSS...
"One of the limiting factors is the mirrors on the laser cavity - it is very hard to produce a partially-reflective mirror with consistent properties across a wide length of wavelengths. And at X-Ray frequencies, we have are no effective mirrors"
my understanding of a FEL laser assumed there were no mirrors (single pass), microwaves are used in combination with resonant cavities (buncher/catcher) and shot between an array of magnets,electrons are then drained from the system.
the purpose of the iron and copper is to create a magnetic field, the "features" of this magnetic field could me modified by designing it as a composite and use elctronics to switch the configuration:
NNNNSSSSNNNNSSSSNNNN...
NNSSNNSSNNSSNNSSNNSS...
NNNNNNNNNNSSSSSSSSSS...
"One of the limiting factors is the mirrors on the laser cavity - it is very hard to produce a partially-reflective mirror with consistent properties across a wide length of wavelengths. And at X-Ray frequencies, we have are no effective mirrors"
my understanding of a FEL laser assumed there were no mirrors (single pass), microwaves are used in combination with resonant cavities (buncher/catcher) and shot between an array of magnets,electrons are then drained from the system.