發送短信 : Passively mode-locked fiber laser

 _    _     _____    _    _      ___     ______   
| \  / ||  |  ___|| | \  / ||   / _ \\  |      \\ 
|  \/  ||  | ||__   |  \/  ||  / //\ \\ |  --  // 
| .  . ||  | ||__   | .  . || |  ___  |||  --  \\ 
|_|\/|_||  |_____|| |_|\/|_|| |_||  |_|||______// 
`-`  `-`   `-----`  `-`  `-`  `-`   `-` `------`