Other Types
Chemical reaction is used as a power source in chemical lasers. This allows for very high output powers difficult to reach by other means.
Nuclear fission is used in exotic nuclear pumped lasers (NPL), directly employing the energy of the fast neutrons released in a nuclear reactor.
The United States military tested an X-ray laser pumped by a nuclear weapon in the 1980s, but the results of the test were inconclusive and it has not been repeated.
Read more about this topic: Laser Pumping
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