I wonder if there is a way to dope a fiber with Kr-Cl in order to get a 222 nm output by using a laser diode to pump into the fiber. In fact, I need 222 nm radiation with low 500 mW, lightweight and portable.
Would a KrCl Excimer Laser work with a high repetition frequency and attenuated via a filter or would the instantaneous power be still too high for your application?
What is the smallest size of a KrCl Excimer Laser then? My understanding is that there is a high threshold for "exciting" the KrCl molecules.
I do not know enough about KrCl although I have worked extensively with ArF and KrF Excimer Laser from Lambda Physik GmbH many years ago. We had a 33kV supply and it produced 100 to 200 mJ energy per pulse each lasting 10 to 14 ns. PRF of up to 50 was possible in that case.
The correct answer is "No". Excimer molecules only exist in excited state that is a result of high power pumping achieved in a large volume electric discharge. KrCl has the highest specific pump power required for reliable operation ~ 6 MW/cm3. Whereas other excimers are normally operated at 1-3 MW/cm3.
If you talk about small excimers, they usually have all solid state pump that provides small specific pump power and output energy, I would doubt that most of them will generate at 222 nm. Big lasers with thyratron based pump are capable of working on KrCl at ~1/4 of energy and power of other mixtures. Footprint of such lasers is usually on ~1-2 m^2 scale.
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