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The light consists of essentially one specific wavelength (color).

L=mλ2cap L equals m the fraction with numerator lambda and denominator 2 end-fraction is the cavity length, is an integer, and is the wavelength. The frequency spacing ( ) between these longitudinal modes is defined by: laser fundamentals silfvast pdf exclusive

: The light consists of a narrow band of wavelengths due to the specific atomic transitions involved. The light consists of essentially one specific wavelength

For laser action to occur, must dominate over absorption. This requires a population inversion , where more atoms are in an upper excited state than in a lower energy state. is an integer

): The minimum gain required to overcome internal cavity losses and initiate laser oscillation. Advancing Your Laser Studies