發送短信

數:

提供者:

CAPTCHA:

  _____      ___      _____    __   __    _____   
 |__  //    / _ \\   /  ___||  \ \\/ //  |__  //  
   / //    | / \ || | // __     \ ` //     / //   
  / //__   | \_/ || | \\_\ ||    | ||     / //__  
 /_____||   \___//   \____//     |_||    /_____|| 
 `-----`    `---`     `---`      `-`'    `-----`

Please enter what you see:

發送短信 : Preserving a diffraction-limited beam in Ho:YAG laser using coherent polarization locking