an energy source (e.g., electric current, pump lamp or chemical reaction)

an energy source (e.g., electric current, pump lamp or chemical reaction)

In a laser, a lamp excites atoms or molecules in a chamber to a higher energy state.

In a laser, a lamp excites atoms or molecules in a chamber to a higher energy state.

After Gas lasers that emitted 808 nanometers became a real pump source for neodymium lasers in solid state, these replaced lamp pumping; that happened because diode pumping ended up being a lot more efficient.

Lamp pumping is possible due to the broadband pump absorption mainly in the 800-nm region and the four-level characteristics.