激光中的模式该怎么理解？具体的物理意义
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分为横模（transverse mode）和纵模（longitudinal mode）
以下摘自wiki
Transverse modes are classified into different types:
TE modes (Transverse Electric) no electric field in the direction of propagation.
TM modes (Transverse Magnetic) no magnetic field in the direction of propagation.
TEM modes (Transverse ElectroMagnetic) neither electric nor magnetic field in the direction of propagation.
A longitudinal mode of a resonant cavity is a particular standing wave pattern formed by waves confined in the cavity.
真想搞明白，请自行参阅激光原理一书
以下摘自wiki
Transverse modes are classified into different types:
TE modes (Transverse Electric) no electric field in the direction of propagation.
TM modes (Transverse Magnetic) no magnetic field in the direction of propagation.
TEM modes (Transverse ElectroMagnetic) neither electric nor magnetic field in the direction of propagation.
A longitudinal mode of a resonant cavity is a particular standing wave pattern formed by waves confined in the cavity.
真想搞明白，请自行参阅激光原理一书
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