A laser beam is directed into the dove prism which is
antireflection (AR) coated. The first surface reflection from the
entrance face of the dove prism is directed to the beam profile camera (BA-CAM). The remaining laser light then exits the dove prism and directed through a focusing lens and then into the beam waist analyzer camera
(BWA-CAM). The BWA-CAM has a built-in OD of 4.0 so the camera can take a
high level of laser power directly. Nevertheless, the camera includes a
filter cartridge to add additional ND filters color filters as
required.
As the BWA-CAM is based upon the use of a pair of Fabry-Perot
resonator optics and the spacing between the optics creates "time"
slices of the beam, the entire beam waist is imaged on the camera sensor
so that the full beam waist caustic can be visualized and measured
without any moving parts. Further, the spacing of the Fabry-Perot is
user adjustable to accommodate short or long Rayleigh lengths. This
design provides a more consistent and stable measurement of a laser
system's focusing characteristics.
The important benefits of the Haas LTI M-squared measurement system compared to other systems on the market are as follows:
- No moving parts -- results in M-squared measurements in fractions of a second, typically <0.5 seconds!
- No motion control to worry about -- a laptop with 2 USB ports is all that is needed to measure.
- Since there is no motion, the weight and size of the Haas LTI system is significantly less any other system on the market!
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