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公开(公告)号：US20230236494A1
公开(公告)日：2023-07-27
申请号：US18101483
申请日：2023-01-25
Inventor： Ivan Divliansky , Leonid Glebov , Lam Mach , Oussama Mhibik
IPC: G03F1/26 , H01S3/06 , H04B10/572 , G01J9/02
CPC classification number: G03F1/26 , H01S3/0621 , H04B10/572 , G01J9/02 , G03H1/0248
Abstract: A phase transformation device may include a solid photosensitive material having a planar input facet and one or more reflective holographic phase masks (RHPMs) within a volume of the solid photosensitive material, where a particular one of the one or more RHPMs is formed as a periodic refractive index variation of the photosensitive material along a particular grating vector and further with a particular non-planar lateral phase profile, where at least one of a period of the refractive index variation along the grating vector or an orientation of the grating vector for each of the one or more RHPMs are arranged to reflect via Bragg diffraction light incident on the input facet that satisfies a Bragg condition, and where a phase distribution of the reflected light from a particular one of the one or more RHPMs is modified by the associated non-planar lateral phase profile.
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公开(公告)号：US12210175B2
公开(公告)日：2025-01-28
申请号：US18676022
申请日：2024-05-28
Inventor： Lam Mach , Ivan Divliansky , Leonid Glebov
Abstract: An imaging element may include volume Bragg grating (VBG) within a material, where the material has an input face, and where the VBG is formed as a periodic distribution of curved surfaces of refractive index variation with chirped periodicity in a volume of the material. The periodic distribution of curved surfaces of refractive index variation forming the VBG may be selected to image different object planes oriented parallel to the input face onto different lateral locations of a single image plane with different wavelengths via the Bragg diffraction.
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公开(公告)号：US20240393510A1
公开(公告)日：2024-11-28
申请号：US18676022
申请日：2024-05-28
Inventor： Lam Mach , Ivan Divliansky , Leonid Glebov
Abstract: An imaging element may include volume Bragg grating (VBG) within a material, where the material has an input face, and where the VBG is formed as a periodic distribution of curved surfaces of refractive index variation with chirped periodicity in a volume of the material. The periodic distribution of curved surfaces of refractive index variation forming the VBG may be selected to image different object planes oriented parallel to the input face onto different lateral locations of a single image plane with different wavelengths via the Bragg diffraction.
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公开(公告)号：US12013557B1
公开(公告)日：2024-06-18
申请号：US18196324
申请日：2023-05-11
Inventor： Lam Mach , Ivan Divliansky , Leonid Glebov
CPC classification number: G02B5/1861
Abstract: A phase-shifted longitudinally-chirped volume Bragg grating (PS-LCVBG) may be formed as a solid block of photosensitive material having a planar input face, where the photosensitive material includes a VBG formed as a periodic volumetric refractive index distribution characterized by a grating vector direction. A period of the VBG may longitudinally chirped to vary linearly along the grating vector direction. The VBG may further include a spatially-varying distribution of longitudinal phase shifts providing a spatially-varying distribution of reflectivity in a transverse plane normal to the grating vector direction, where light incident on the planar input face is at least partially reflected based on the spatially-varying distribution of reflectivity.
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公开(公告)号：US10790631B2
公开(公告)日：2020-09-29
申请号：US16032808
申请日：2018-07-11
Inventor： Zenghu Chang , Xiaoming Ren , Yanchun Yin , Lam Mach
Abstract: The present invention demonstrates a technique for achieving milli-joule level and higher energy, broad bandwidth laser pulses centered around 2.4 micrometer with a kilohertz and other repetition rate. The key to such technique is to start with a broadband micro-joule level seed laser at around 2.4 micrometer, which could be generated through difference frequency generation, four-wave mixing process and other methods. This micro-joule level seed laser could then be amplified to above one milli-joule through chirped pulse amplification in a Cr2+:ZnSe or Cr2+:ZnS crystal pumped by a commercially available Ho:YAG or other appropriate suitable lasers. Due to the high seed energy, fewer gain passes are needed to achieve a milli-joule level output thus significantly simplifies laser architectures. Furthermore, gain narrowing effect in a typical chirped pulse amplifier is also mitigated and thus enable a broadband output.
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公开(公告)号：US20190020166A1
公开(公告)日：2019-01-17
申请号：US16032808
申请日：2018-07-11
Inventor： Zenghu Chang , Xiaoming Ren , Yanchun Yin , Lam Mach
CPC classification number: H01S3/0057 , H01S3/0092 , H01S3/0606 , H01S3/094076 , H01S3/115 , H01S3/161 , H01S3/1623 , H01S3/1625 , H01S3/1628 , H01S3/1636 , H01S3/1643 , H01S3/2308 , H01S3/2316 , H01S3/2325 , H01S3/2375
Abstract: The present invention demonstrates a technique for achieving milli-joule level and higher energy, broad bandwidth laser pulses centered around 2.4 micrometer with a kilohertz and other repetition rate. The key to such technique is to start with a broadband micro-joule level seed laser at around 2.4 micrometer, which could be generated through difference frequency generation, four-wave mixing process and other methods. This micro-joule level seed laser could then be amplified to above one milli-joule through chirped pulse amplification in a Cr2+:ZnSe or Cr2+:ZnS crystal pumped by a commercially available Ho:YAG or other appropriate suitable lasers. Due to the high seed energy, fewer gain passes are needed to achieve a milli-joule level output thus significantly simplifies laser architectures. Furthermore, gain narrowing effect in a typical chirped pulse amplifier is also mitigated and thus enable a broadband output.
