Figure 5
Diagram of the parallel laser beam experimental apparatus: 1: HeNe laser or Nd:YAG laser; 2: spatial filter and collimator; 3: x–y–z–θ stage; 4: fibre input; 5: fibre; 6: fibre output; 7: screen; 8: re-imaging lens, and 9: CCD camera.

Diagram of the parallel laser beam experimental apparatus: 1: HeNe laser or Nd:YAG laser; 2: spatial filter and collimator; 3: x–y–z–θ stage; 4: fibre input; 5: fibre; 6: fibre output; 7: screen; 8: re-imaging lens, and 9: CCD camera.

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