EP 4308982 A1 20240124 - RECORDING A LATENT HOLOGRAPHIC GRATING AND AMPLIFICATION OF ITS DYNAMIC RANGE
Title (en)
RECORDING A LATENT HOLOGRAPHIC GRATING AND AMPLIFICATION OF ITS DYNAMIC RANGE
Title (de)
AUFZEICHNUNG EINES LATENTEN HOLOGRAPHISCHEN GITTERS UND VERSTÄRKUNG SEINES DYNAMISCHEN BEREICHS
Title (fr)
ENREGISTREMENT D'UN RÉSEAU HOLOGRAPHIQUE LATENT ET AMPLIFICATION DE SA PLAGE DYNAMIQUE
Publication
Application
Priority
- US 202163163594 P 20210319
- US 202217674726 A 20220217
- US 2022021120 W 20220321
Abstract (en)
[origin: WO2022198121A1] Recording a volume Bragg grating is effectuated by a recording medium formed from a matrix polymer precursor including a controlled radical reactive group, a photoactive base monomer, and a photoinitiator system more reactive with the photoactive base monomer than the controlled radical reactive group in the presence of an excitation source, and a photoredox catalyst. The medium is cured thereby forming a support matrix from the matrix polymer precursor. Exposure to the excitation source through a pattern causes the photoinitiator to polymerize the base monomer, forming a latent grating of the Bragg grating. The latent grating has bright and dark fringes determined by the pattern. The concentration of polymerized base polymer is higher in the bright fringes than in the dark fringes. The exposing causes a portion of the matrix to diffuse into the dark fringes. The support matrix has a lower refractive index than the polymerized photoactive base monomer.
IPC 8 full level
CPC (source: EP)
C08F 2/50 (2013.01); G02B 5/1857 (2013.01); G03F 7/001 (2013.01); G03F 7/0045 (2013.01); G03F 7/027 (2013.01); G03F 7/035 (2013.01); G03F 7/105 (2013.01); G03F 7/2022 (2013.01); G02B 2027/0174 (2013.01); G03H 1/0248 (2013.01); G03H 2260/12 (2013.01)
Citation (search report)
See references of WO 2022198121A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
WO 2022198121 A1 20220922; EP 4308982 A1 20240124; TW 202240286 A 20221016
DOCDB simple family (application)
US 2022021120 W 20220321; EP 22715291 A 20220321; TW 111108419 A 20220308