writing a long period grating
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Posted by asnass on May 11, 2007, 4:39 am
Please log in for more thread options I bother you for help. I am trying to write a LPG into a photosensitive fiber type Nufern GF1 by point to point technique (i.e. I am using a shutter to block the beam and making a pattern with period 400um). I have used a power of 50mW and the beam is focused into a spot of 200um, the exposure time is 3min per cell, 60 cells . The result is: nothing! Does anybody have an idea about what I do wrong? I have some dubts already, but I am not sure whether they are correct or not: 1) the photosensitivity is still too low and I will never get anything with this laser (I cannot send in more power) 2) I do not make beam filtering to avoid the waste of power. Does this limit the focusing due to abberations? Thanks in advance to anybody who can give me some hints! Asnass | ||||||||||
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