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palber4 2, High-voltage electricity causes the quartz flash tube to emit an intense burst of light, exciting some of the atoms in the ruby crystal to higher energy levels. Step 2 At a specific energy level, some atoms emit particles of light called photons. At first the photons are emitted in all directions. Photons from one atom stimulate emission of photons from other atoms and the light intensity is rapidly amplified., Light Amplification by Simulated Emmission of Radiation Step1 High-voltage electricity causes the quartz flash tube to emit an intense burst of light, exciting some of the atoms in the ruby crystal to higher energy levels., Mirrors at each end reflect the photons back and forth, continuing this process of stimulated emission and amplification. Step 4 The photons leave through the partially silvered mirror at one end. This is laser light., Mirrors at each end reflect the photons back and forth, continuing this process of stimulated emission and amplification. ???? , At a specific energy level, some atoms emit particles of light called photons. At first the photons are emitted in all directions. Photons from one atom stimulate emission of photons from other atoms and the light intensity is rapidly amplified. illustration , At a specific energy level, some atoms emit particles of light called photons. At first the photons are emitted in all directions. Photons from one atom stimulate emission of photons from other atoms and the light intensity is rapidly amplified. illustration , aluminum oxide crystal aluminum atoms have been replaced with chromium atoms, Peter A By: How the Ruby Laser Works, chromium atoms absorb green and blue light and emit or reflect only red light, At a specific energy level, some atoms emit particles of light called photons. At first the photons are emitted in all directions. Photons from one atom stimulate emission of photons from other atoms and the light intensity is rapidly amplified. Step 3 Mirrors at each end reflect the photons back and forth, continuing this process of stimulated emission and amplification.