Spot size change on NI photodiodes
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Spot size change on NI photodiodes
laura Thu Mar 11, 2010 5:27 pm
(Alessio, Viviana, Laura)
We notes that the size of the beam on the NI PDs is much smaller than that of the WI. So we moved the focus lens in front of the PDs in order to make the spot size approximately equal to that of the WI.
Here the distances between some optical components on the WI and NI respectively:
WI --> L-BS = 5cm ; BS-FOL = 12cm ; BS-FL = 7cm
NI --> L-BS = 11cm ; BS-FOL = 10.5cm ; BS-FL = 8cm (before moving the focus lens and the in loop PD)
NI --> L-BS = 7cm ; BS-FOL = 10.5cm ; BS-FL = 5cm (after moving the focus lens and the in loop PD)
We notes that the size of the beam on the NI PDs is much smaller than that of the WI. So we moved the focus lens in front of the PDs in order to make the spot size approximately equal to that of the WI.
Here the distances between some optical components on the WI and NI respectively:
WI --> L-BS = 5cm ; BS-FOL = 12cm ; BS-FL = 7cm
NI --> L-BS = 11cm ; BS-FOL = 10.5cm ; BS-FL = 8cm (before moving the focus lens and the in loop PD)
NI --> L-BS = 7cm ; BS-FOL = 10.5cm ; BS-FL = 5cm (after moving the focus lens and the in loop PD)
laura- Posts : 8
Join date : 2009-11-05
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