A device for continuous control of the laser intensity, together with beam profile and pointing monitoring, over very large dynamic
range.
In order to achieve this, the evanescent field from the total internal reflection in one prism is used
to tune continuously the beam intensity over 110dB.
A device for continuous control of the laser intensity, together with beam profile and pointing monitoring, over very large dynamic range was developed, for adjusting a laser beam to a precise power level required by a current application. The attenuator consists of two glass prisms positioned in close proximity to each other. The evanescent field from the total internal reflection in one prism is used to tune continuously the beam intensity over 110dB. Such a device has numerous potential applications in medicine, non-destructive testing and materials processing.
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Work at Optics Lab in Extreme Light Infrastructure - Nuclear Physics facility led to a paper on the use of the evanescent field for collimated beam laser attenuator.
MGM Star Construct joined as industrial Partener to develop the technology.
A project to g ofrom Technology Readiness Level 2 (TRL2) to TRL4 was submitted to ATTRACT.
ATTRACT funded the HPLM project to transition from TRL2 to TRL4.
Several components and systems were developed and tested.
Preliminary results were presented at CLEO Europe 2019.
Device developed to TRL4.
Plans to further develop prototype.
Results:
The attenuation in excess of 110 dB was demonstrated
a single device (see figure).
The attenuation variation is driven by two major factors,
the incidence angle at the interface between the two
prisms and the gap between the prisms.
Possible applications:
Lasers are necessary for a large number of applications, from material processing to medical treatment and non-destructive testing (NDT).
Like a scalpel which is as good as sharp, a laser beam needs to
have a constant quality and a precise adjustable power.
This is achievable with the attenuation device developed.
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