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In a typical laser, the right color of light bounces back and forth between two mirrors and is amplified by?
the excited atoms in the laser medium. If you were to send some of the right color of light through the laser medium from the side of the laser, the laser medium would?????
the laser medium would amplify that light - by stimulated emission of radiation.
While most laser devices do indeed have a cavity for multiple passes through the laser medium, some do not. These are sometimes used as single-pass pulse amplifiers. For example, if you get the laser medium atoms excited, then send a laser pulse through, the pulse will be higher energy when it comes out the other side.
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