A wavefront-division polarimetric analysis device (100; 200; 300) to determine the polarisation state of an upstream light beam (102; 202; 302) coming from a light source, characterized in that it includes: - means (110; 211, 212; 311, 312) for dividing the wavefront of said upstream light beam (102; 202; 302), adapted to split said upstream light beam (102; 202; 302) into N split light beams (1021, 1022, 1023; 2021, 2022, 2023), where N is an integer higher than or equal to two, each of the N split light beams (1021, 1022, 1023; 2021, 2022, 2023) propagating along a direction of propagation forming an angle of deviation with the direction of propagation of the upstream light beam (102; 202; 302), the N deviation angles being all different, such that said N split light beams (1021, 1022, 1023; 2021, 2022, 2023) are angularly separated, - polarisation modification means (120; 221, 222; 320) adapted to modify the polarisation state of each of said at least (N-1) split light beams, such that said N split light beams are polarised according to polarisation states that are all different, - polarisation separation means (130; 230; 330), arranged so as to intercept said N split light beams (1021, 1022, 1023; 2021, 2022, 2023), and adapted to generate, from each of said N split light beams (1021, 1022, 1023; 2021, 2022, 2023), two light beams polarised according to two orthogonal polarisation states and along two different directions of propagation, so as to generate 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B), - a plurality (140; 240) of detectors (141, 142, 143, 144, 145, 146; 241, 242, 243, 244, 245, 246; 341, 342, 343, 344) intercepting said 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B) and arranged in such a manner that one detector intercepts only one of said 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B), said plurality (140; 240) of detectors (141, 142, 143, 144, 145, 146; 241, 242, 243, 244, 245, 246; 341, 342, 343, 344) delivering 2*N signals relating to the luminous intensity of each of the 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B) intercepted by said detectors (141, 142, 143, 144, 145, 146; 241, 242, 243, 244, 245, 246; 341, 342, 343, 344), and - processing means adapted to collect said 2*N signals at the output of said plurality (140; 240) of detectors (141, 142, 143, 144, 145, 146; 241, 242, 243, 244, 245, 246; 341, 342, 343, 344) to determine the polarisation state of said upstream light beam (102; 202; 302) from said luminous intensities of the 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B). - means (110; 211, 212; 311, 312) for dividing the wavefront of said upstream light beam (102; 202; 302), adapted to split said upstream light beam (102; 202; 302) into N split light beams (1021, 1022, 1023; 2021, 2022, 2023), where N is an integer higher than or equal to two, each of the N split light beams (1021, 1022, 1023; 2021, 2022, 2023) propagating along a direction of propagation forming an angle of deviation with the direction of propagation of the upstream light beam (102; 202; 302), the N deviation angles being all different, such that said N split light beams (1021, 1022, 1023; 2021, 2022, 2023) are angularly separated, - polarisation modification means (120; 221, 222; 320) adapted to modify the polarisation state of each of said at least (N-1) split light beams, such that said N split light beams are polarised according to polarisation states that are all different, - polarisation separation means (130; 230; 330), arranged so as to intercept said N split light beams (1021, 1022, 1023; 2021, 2022, 2023), and adapted to generate, from each of said N split light beams (1021, 1022, 1023; 2021, 2022, 2023), two light beams polarised according to two orthogonal polarisation states and along two different directions of propagation, so as to generate 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B), - a plurality (140; 240) of detectors (141, 142, 143, 144, 145, 146; 241, 242, 243, 244, 245, 246; 341, 342, 343, 344) intercepting said 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B) and arranged in such a manner that one detector intercepts only one of said 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B), said plurality (140; 240) of detectors (141, 142, 143, 144, 145, 146; 241, 242, 243, 244, 245, 246; 341, 342, 343, 344) delivering 2*N signals relating to the luminous intensity of each of the 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B) intercepted by said detectors (141, 142, 143, 144, 145, 146; 241, 242, 243, 244, 245, 246; 341, 342, 343, 344), and - processing means adapted to collect said 2*N signals at the output of said plurality (140; 240) of detectors (141, 142, 143, 144, 145, 146; 241, 242, 243, 244, 245, 246; 341, 342, 343, 344) to determine the polarisation state of said upstream light beam (102; 202; 302) from said luminous intensities of the 2*N polarised light beams (1021A, 1021B, 1022A, 1022B, 1023A, 1023B; 2021A, 2021B, 2022A, 2022B, 2023A, 2023B).