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Does the tin itself lase? Is the radiation given off from the tin single-frequency and phase coherent?

No. And it doesn’t matter for their use case.

seems like a recipe for fragility... The mixtures of wavelengths will make optimizing other parts of the process very hard. And even keeping a consistent mix of wavelengths isn't easy.

Well, go apply here: https://www.cymer.com/careers/

Given the criticality of the tech, I'm sure the price will be met.

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