Morgan
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- Feb 5, 2009
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Hi All,
I have a couple of questions regards polarization please. I will try to be clear in text as I have limited access to pics but I hope you will all be able to understand my queries and offer some insights...
Firstly, the aim here is use PBS cubes to combine two magenta beams. Each single magenta beam will be achieved by using dichros to combine red and blue, (or BR), and then run the two magentas through the cube.
My questions are:
Is polarization directly related to die orientation? I.e. will two dies, of similar diodes, in the same orientation have the same polarization angle and is that angle perpendicular to fast and slow axes?
Illustration -
If the pins show this layout for two diodes, will the polarization angle be the same?
Will this layout show a 90 degree difference in polarization angle for diodes of different wavelengths?
The next question is, (depending on the answer to the first, this may be a moot point), Will different diodes show the same polarization when the pins are are in the same configuration? If we look at the first illustration and assume one is a red LD and one a BR.
Next, Looking at most sleds, if we take the line between the two outer pins, they seem to be aligned in either the x or y axiz with relation to the PBS cubes inside. This leads me to think I could simply align my diodes in this fashion and expect reasonable results without having to, 'tune', their orientation using an LPM before fixing their position. Is this correct?
I hope that's clear enough but if I need to clarify anything then please ask.
Many thanks all,
M
I have a couple of questions regards polarization please. I will try to be clear in text as I have limited access to pics but I hope you will all be able to understand my queries and offer some insights...
Firstly, the aim here is use PBS cubes to combine two magenta beams. Each single magenta beam will be achieved by using dichros to combine red and blue, (or BR), and then run the two magentas through the cube.
My questions are:
Is polarization directly related to die orientation? I.e. will two dies, of similar diodes, in the same orientation have the same polarization angle and is that angle perpendicular to fast and slow axes?
Illustration -
If the pins show this layout for two diodes, will the polarization angle be the same?
Will this layout show a 90 degree difference in polarization angle for diodes of different wavelengths?
The next question is, (depending on the answer to the first, this may be a moot point), Will different diodes show the same polarization when the pins are are in the same configuration? If we look at the first illustration and assume one is a red LD and one a BR.
Next, Looking at most sleds, if we take the line between the two outer pins, they seem to be aligned in either the x or y axiz with relation to the PBS cubes inside. This leads me to think I could simply align my diodes in this fashion and expect reasonable results without having to, 'tune', their orientation using an LPM before fixing their position. Is this correct?
I hope that's clear enough but if I need to clarify anything then please ask.
Many thanks all,
M
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