Staff profile

Conference Paper

• WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques
  
  Bharmal, N. A., Bramall, D., Calcines Rosario, A. Z., Morris, T. J., Schmoll, J., & Staykov, L. (2022). WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques. In L. Schreiber, D. Schmidt, & E. Vernet (Eds.), Proceedings Volume 12185, Adaptive Optics Systems VIII; SPIE Astronomical Telescopes + Instrumentation. SPIE. https://doi.org/10.1117/12.2629888

Journal Article

• Laboratory quantification of a plenoptic wavefront sensor with extended objects
  
  Zhang, Z., Bharmal, N., Morris, T., & Liang, Y. (2020). Laboratory quantification of a plenoptic wavefront sensor with extended objects. Monthly Notices of the Royal Astronomical Society, 497(4). https://doi.org/10.1093/mnras/staa2269
• Laboratory demonstration of single-camera PPPP wavefront sensing using neural networks
  
  Gonzalez-Gutierrez, C., Bharmal, N. A., Rodriguez-Muro, J., Buendia-Roca, A., Yang, H., Fitzpatrick, L. W., Morris, T. J., & de Cos Juez, F. J. (2024). Laboratory demonstration of single-camera PPPP wavefront sensing using neural networks. International Journal of Optomechatronics, 18(1), Article 2386985. https://doi.org/10.1080/15599612.2024.2386985
• Concept validation of a high dynamic range point-diffraction interferometer for wavefront sensing in adaptive optics
  
  Dubost, N., Bharmal, N. A., Dubbeldam, M., & Myers, R. M. (2022). Concept validation of a high dynamic range point-diffraction interferometer for wavefront sensing in adaptive optics. Applied Optics, 61(14), 4160-4167. https://doi.org/10.1364/ao.439569
• First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope
  
  Nayak, A. S., Labadie, L., Sharma, T. K., Piacentini, S., Corrielli, G., Osellame, R., Gendron, Éric, Buey, J.-T. M., Chemla, F., Cohen, M., Bharmal, N. A., Bardou, L. F., Staykov, L., Osborn, J., Morris, T. J., Pedretti, E., Dinkelaker, A. N., Madhav, K. V., & Roth, M. M. (2021). First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope. Applied Optics, 60(19), Article D129. https://doi.org/10.1364/ao.423881
• Global tip-tilt and high-order aberration correction with plenoptic wavefront sensors in closed-loop AO systems
  
  Zhang, Z., Morris, T., Bharmal, N., & Liang, Y. (2021). Global tip-tilt and high-order aberration correction with plenoptic wavefront sensors in closed-loop AO systems. Applied Optics, 60(14), 4208-4216. https://doi.org/10.1364/ao.420729
• On-sky results for the integrated microlens ring tip-tilt sensor
  
  Hottinger, P., Harris, R. J., Crass, J., Dietrich, P.-I., Blaicher, M., Bechter, A., Sands, B., Morris, T., Basden, A. G., Bharmal, N. A., Heidt, J., Anagnos, T., Neureuther, P. L., Glück, M., Power, J., Pott, J.-U., Koos, C., Sawodny, O., & Quirrenbach, A. (2021). On-sky results for the integrated microlens ring tip-tilt sensor. Journal of the Optical Society of America B, 38(9). https://doi.org/10.1364/josab.421459
• On-sky results for adaptive optics control with data-driven models on low-order modes
  
  Sinquin, B., Prengere, L., Kulcsár, C., Raynaud, H.-F., Gendron, E., Osborn, J., Basden, A., Conan, J.-M., Bharmal, N., Bardou, L., Staykov, L., Morris, T., Buey, T., Chemla, F., & Cohen, M. (2020). On-sky results for adaptive optics control with data-driven models on low-order modes. Monthly Notices of the Royal Astronomical Society, 498(3), 3228-3240. https://doi.org/10.1093/mnras/staa2562
• Wind-driven halo in high-contrast images
  
  Cantalloube, F., Farley, O., Milli, J., Bharmal, N., Brandner, W., Correia, C., Dohlen, K., Henning, T., Osborn, J., Por, E., Suárez Valles, M., & Vigan, A. (2020). Wind-driven halo in high-contrast images. Astronomy and Astrophysics., 638, Article A98. https://doi.org/10.1051/0004-6361/201937397
• Projected Pupil Plane Pattern (PPPP) with artificial Neural Networks
  
  Yang, H., Gonzalez, C., Bharmal, N., & de Cos, F. (2019). Projected Pupil Plane Pattern (PPPP) with artificial Neural Networks. Monthly Notices of the Royal Astronomical Society, 487(1), 1480-1487. https://doi.org/10.1093/mnras/stz1362
• PEPITO: atmospheric Profiling from short-Exposure focal Plane Images in seeing-limiTed mOde
  
  Beltramo-Martin, O., Bharmal, N. A., & Correia, C. (2019). PEPITO: atmospheric Profiling from short-Exposure focal Plane Images in seeing-limiTed mOde. Monthly Notices of the Royal Astronomical Society, 486(2), 2032-2041. https://doi.org/10.1093/mnras/stz979
• Laboratory demonstration of an alternative laser guide stars wavefront sensing technique—projected pupil plane pattern
  
  Yang, H., Bharmal, N., Myers, R., & Younger, E. (2019). Laboratory demonstration of an alternative laser guide stars wavefront sensing technique—projected pupil plane pattern. Journal of Astronomical Telescopes, Instruments, and Systems, 5(2), Article 029002. https://doi.org/10.1117/1.jatis.5.2.029002
• Origin of the asymmetry of the wind driven halo observed in high-contrast images
  
  Cantalloube, F., Por, E., Dohlen, K., Sauvage, J.-F., Vigan, A., Kasper, M., Bharmal, N., Henning, T., Brandner, W., Milli, J., Correia, C., & Fusco, T. (2018). Origin of the asymmetry of the wind driven halo observed in high-contrast images. Astronomy and Astrophysics., 620, Article L10. https://doi.org/10.1051/0004-6361/201834311
• Projected Pupil Plane Pattern: an alternative LGS wavefront sensing technique
  
  Yang, H., Bharmal, N. A., & Myers, R. M. (2018). Projected Pupil Plane Pattern: an alternative LGS wavefront sensing technique. Monthly Notices of the Royal Astronomical Society, 477(4), 4443-4453. https://doi.org/10.1093/mnras/sty926
• Calibration of quasi-static aberrations in high-contrast astronomical adaptive optics with a pupil-modulated point-diffraction interferometer
  
  Dubost, N., Bharmal, N., & Myers, R. M. (2018). Calibration of quasi-static aberrations in high-contrast astronomical adaptive optics with a pupil-modulated point-diffraction interferometer. Optics Express, 26(9), 11068-11083. https://doi.org/10.1364/oe.26.011068
• Estimating stochastic noise using in-situ measurements from a linear wavefront slope sensor
  
  Bharmal, N., & Reeves, A. (2016). Estimating stochastic noise using in-situ measurements from a linear wavefront slope sensor. Optics Letters, 41(2), 428-431. https://doi.org/10.1364/ol.41.000428