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absorb absorption amplifier angle applications argon atoms or molecules bandgap beam divergence carbon-dioxide laser Chapter coherent continuous-wave crystal depends detector diameter diode lasers disks distance dye lasers efficiency electric electrons electronvolts emit light energy levels excimer lasers excited flashlamp free-electron laser frequency GaAlAs gas lasers helium helium-neon laser high-power holes infrared input junction laser action laser beam laser cavity laser light laser material laser medium laser operation laser pulses Laser Pumping laser transition laser tube laser wavelength lasers emit lens lenses light rays light waves longitudinal mode lower laser level measured micrometers modelocked modulation nanometers Nd-YAG neodymium neodymium lasers oscillation output mirror output power photon polarization population inversion power levels produce a population range of wavelengths reflected refractive index repetition rate resonator ruby semiconductor lasers shorter shown in Figure solid-state lasers spectrum stimulated emission surface typically ultraviolet upper laser level vibrational vibronic watts wavelengths wiggler X-ray laser