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. 2010 Jul 23;18(16):16840–16848. doi: 10.1364/OE.18.016840

Fig. 4.

Fig. 4

Back side machining sample measurements show that the maximum channel length increases with increasing fluence at low powers, but plateaus at ~8 µm for fluences above ~80 J/cm2. The maximum channel length is obtained by taking the average of the four longest channels observed at each fluence.