yykcw
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In textbook, the cavity gain of laser is given by:
(1-R1)(1-R2)Gs/
(1-(R1R2)½Gs)²+4(R1R2)½Gssin²Φ
Where Φ is a function of the light frequency.
I don't understand if Φ is a function of f, which means the gain vary endlessly against the frequency of light, however, the cavity support infinite no of longitudinal mode, then how the laser can choose to emit only a specific range of frequency of light?
(1-R1)(1-R2)Gs/
(1-(R1R2)½Gs)²+4(R1R2)½Gssin²Φ
Where Φ is a function of the light frequency.
I don't understand if Φ is a function of f, which means the gain vary endlessly against the frequency of light, however, the cavity support infinite no of longitudinal mode, then how the laser can choose to emit only a specific range of frequency of light?