add another hartmann sensor reference and updated in paper.md

Author: marvelousmonicaaa

paper.bib

@@ -199,6 +199,21 @@ @inproceedings{shack1971production
   url={https://doi.org/10.1364/JOSA.61.000648}
 }
 
+@misc{Paschottashack_hartmann_wavefront_sensors},
+  author = {Paschotta, R.},
+  publisher = {RP Photonics AG},
+  title = {Shack–Hartmann Wavefront Sensors},
+  abstract = {Shack--Hartmann sensors measure wavefront shapes and optical amplitude distributions. They are used in adaptive optics and laser beam characterization.},
+  year = {},
+  month = {},
+  howpublished = {RP Photonics Encyclopedia},
+  note = {{Available online at \url{https://www.rp-photonics.com/shack_hartmann_wavefront_sensors.html}},
+  url = {https://www.rp-photonics.com/shack_hartmann_wavefront_sensors.html},
+  doi = {10.61835/jcv" title="This link will reload the current page.},
+  urldate = {2024-10-25},
+  keywords = {Shack–Hartmann wavefront sensors}
+}
+
 @inproceedings{cupy_learningsys2017,
   author       = "Okuta, Ryosuke and Unno, Yuya and Nishino, Daisuke and Hido, Shohei and Loomis, Crissman",
   title        = "CuPy: A NumPy-Compatible Library for NVIDIA GPU Calculations",

paper.md

@@ -98,7 +98,7 @@ In the example depicted in \autoref{fig:aberration}, we simulate the beam profil
 ![Simulation of the beam profiles at the image plane with and without aberration correction. (a) Phase map of the input beam with $\mathbb{Z}_4^0$ spherical aberration. (b) Intensity profile of the input beam. (c) Intensity profile of the first order beam without aberration correction. (d) Intensity profile of the first order beam with aberration correction. (Source code: `examples/aberration_correction.py`) \label{fig:aberration}](aberration_correction.png)
 
 
-To obtain the phase map of the aberration, one can either use a wavefront sensor, such as a Shack–Hartmann sensor [@shack1971production], to measure the wavefront, or one can allow light from different parts of the Fourier plane to interfere with each other to reconstruct the aberration phase profile from the resulting interference patterns. For a detailed description of the latter method, one can refer to Shih et al. [@shih2021reprogrammable].
+To obtain the phase map of the aberration, one can either use a wavefront sensor, such as a Shack–Hartmann sensor [@shack1971production;@Paschottashack_hartmann_wavefront_sensors], to measure the wavefront, or one can allow light from different parts of the Fourier plane to interfere with each other to reconstruct the aberration phase profile from the resulting interference patterns. For a detailed description of the latter method, one can refer to Shih et al. [@shih2021reprogrammable].
 
 ## Hardware Controls
 `pySLM2` provides hardware controls for DMD controllers from both Visitech, INC and ViALUX GmbH. The controllers from these two companies use different communication protocols and architectures. The Visitech controller uses UDP over Ethernet, while the ViALUX controller uses USB3.