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Thread: Any gap between optical input and the detector in OSA


Permlink Replies: 3 - Pages: 1 - Last Post: Mar 29, 2011 9:26 AM Last Post By: mkelly
yusofagilent

Posts: 3
Registered: 03/28/11
Any gap between optical input and the detector in OSA
Posted: Mar 28, 2011 1:26 AM
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Hi,

I'm Yusof. I would like to know is there any air gap between the optical input and the detector in the Optical Spectrum Analyzer?

Thanks in advance
mkelly

Posts: 168
Registered: 02/06/07
Re: Any gap between optical input and the detector in OSA
Posted: Mar 28, 2011 1:45 AM   in response to: yusofagilent in response to: yusofagilent
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Hi Yusof,
Thanks for the question. The OSA uses a grating-based monochromator which has a fairly long open-beam path. So there is definitely transmission through air in the instrument. This can be noticed molecular absorption lines near 1400nm wavelength, especially under humid ambient conditions.

Regards,
Mike
yusofagilent

Posts: 3
Registered: 03/28/11
Re: Any gap between optical input and the detector in OSA
Posted: Mar 28, 2011 4:47 PM   in response to: yusofagilent in response to: yusofagilent
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Thanks. Now it make sense as I noticed there were some absorption near 1400 nm band.

Could you please let me know how long those open-beam path?
This information is very crucial to me as I'm developing humidity sensor currently.
I try to look in the datasheet but could not find that information.

Thanks in advance.

Best Regards,
Yusof
mkelly

Posts: 168
Registered: 02/06/07
Re: Any gap between optical input and the detector in OSA
Posted: Mar 29, 2011 9:26 AM   in response to: yusofagilent in response to: yusofagilent
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Hi Yusof,
I don't have the details and these dimensions are not externally specified.
Probably it is about 1 meter, considering this is a double-pass monochromator.
A schematic view is available in this note:
http://www.home.agilent.com/agilent/redirector.jspx?action=ref&cname=AGILENT_EDITORIAL&ckey=1000000274%3Aepsg%3Aapn&lc=eng&cc=US&nfr=-536900356.0.00

Regards,
Mike

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