Modeling LGS Spot Elongation

1
Modeling LGS Spot Elongation
Convolution of 3 terms


2-d Guidestar on sky
Subaperture PSF
Sodium layer profile
Image vs. transmitter-to-subaperture separation
0 m
4 m
16 m
2
Effective Spot Size vs. Spot Sampling

• Laser power requirement will scale between qB
  and qB2

3
Impact of LGS Elongation on Wavefront
Reconstruction Error Due to Noise