项目来源

俄罗斯科学基金(RSF)

项目主持人

Палашов Олег Валентинович,Доктор физико-математических наук

项目受资助机构

Федеральное государственное бюджетное научное учреждение"Федеральный исследовательский центр Институт прикладной физики им.А.В.Гапонова-Грехова Российской академии наук",Нижегородская обл

立项年度

2025

立项时间

未公开

项目编号

25-42-00100

项目级别

国家级

研究期限

未知 / 未知

受资助金额

未知

学科

PHYSICS AND SPACE SCIENCES-Laser physics.Quantum optics

学科代码

02-02-303

基金类别

未公开

Лазерные керамика и кристаллы ; полуторные оксиды ; термооптика ; магнитооптика ; мощные твердотельные лазеры ; изоляторы Фарадея ; Laser ceramics and crystals ; sesquioxides ; thermooptics ; magnetooptics ; high-power solid-state lasers ; Faraday isolators

参与者

未公开

参与机构

未公开

项目标书摘要：nnotation:High-quality laser radiation with high peak power and,at the same time,high time-average power is required for many practical and fundamental applications.Power enhancement without quality loss makes it possible to significantly speed up production processes,to increase the efficiency of various nonlinear processes,and also expand the range of tasks themselves.This is relevant in various scientific and technological applications:radiation transformations,particle acceleration,the creation of lasers for lithography systems,material processing,and medical applications.The simultaneous high average and peak powers impose significant and sometimes mutually exclusive limitations on the used materials,the geometry of active and magneto-active elements,and optical schemes of laser generators,amplifiers and Faraday isolators.With an increase of the pulse repetition rate,the average radiation power increases and parasitic thermal effects arise in the optical elements.Consequently,the used materials must possess high mechanical and thermo-optical properties.The search for and application of new laser materials possessing a combination of these characteristics is a topical task.Active laser elements and magneto-optical elements of Faraday devices(Faraday isolators,rotators and mirrors)are most susceptible to parasitic thermal effects,which give rise to inhomogeneous polarization and phase distortions,focal spot smearing,radiation bifocusing,beam quality deterioration,power loss,and reduced efficiency of polarization devices.An essential way of solving this problem is to improve the corresponding characteristics of laser materials,as well as to search for,create and use new materials with better thermo-optical properties,and to develop new methods for suppressing thermal effects on the basis of their material features.The main objective of the project is the manufacture of promising laser materials for lasers with high average and high peak power and investigation of theirs properties using original methods.The objects of the study are laser media codoped with Yb,and Nd ions based on single-crystal fluorides(CaF2)and sesquioxide ceramics(Lu2O3);and magneto-optic paramagnetic ceramics(Tb3Al5O12),and fluorides(CeF3,PrF3).These materials can be grown with high quality by colleagues from SIC CAS,and have desirable characteristics.New geometries of optical elements from these materials are also being investigated-crystalline fibers and composite elements that allow efficient heat dissipation,thereby reducing parasitic effects.The obtained data will be used for calculating thermally induced effects in laser elements made of the considered materials,for determining element geometry and optimal method for organizing hint sink,and for choosing the most efficient ways of compensating for parasitic thermal effects.The materials of interest will be compared with the widely used materials,and prospects for their application will be assessed.The undertaken efforts will permit us to develop and manufacture laser components with record characteristics for high-power laser sources with high peak power and simultaneously high average power.Expected results:The next outcomes will be obtained as a results of the project:-The spectral,optical and laser properties of Lu2O3 ceramics and single crystals of calcium fluoride,co-doped with Yb and Nd ions,depending on the degree of doping of each of the dopants,have been studied.The characteristics of the samples are compared with existing analogues(Yb:YAG,Yb:YLF,etc.).-The possibility of generating extremely short pulses for these materials are studied.The thermo-optical characteristics of the materials are measured and compared with the widely used aluminum-yttrium garnet laser material,and the main advantages and disadvantages are highlighted.Based on the systematic studies,most effective media,compositions of sintering additives,sintering and post-processing regimes,and geometry for the manufacture of active laser elements for both high average and peak power are selected.Laser components and technical processes are tested and laser heads with an effective heat sink are implemented.As a result of the project,a unique material base will be prepared for the implementation of a laser with both high average and peak power with record radiation parameters.-The possibility of increasing the gain bandwidth is investigated both by combining several materials with shifted maxima of the gain spectrum in one amplifier,and by using media with simultaneous doping with Nd and Yb ions.-The optical and thermo-optical characteristics of single crystal fibers from CaF2 are studied,the prospects for their use in lasers with high average and peak power are determined,optimal parameters are calculated taking into account the possibilities for their manufacture.-Signal amplification and thermal effects in the media under consideration are simulated for various geometries of active elements and pumping schemes,including the geometries of a thin rod[1],a thin conical rod[2],pumping geometry along lateral surface[3],etc.Based on the calculation results,laser amplifiers are developed using optimal geometry of the active element and pumping system for each medium.The amplification of a pulse-periodic signal with an ultrashort pulse duration is demonstrated.The obtained results allows to create laser sources that surpass existing analogues in terms of average and peak power.-The parameters of magneto-optical TAG ceramics and CeF3 and PrF3 crystals media are studied.The research includes parameters important for high peak power:the threshold of laser-induced damage(LIDT)and the thermal shock parameter.A Faraday isolators based on a traditional scheme for high-power laser radiation,and with thermal lens compensation based on media with different signs of the thermo-optical coefficient(TAG/CeF3,TGG/CeF3)are created and experimentally investigated.-Magneto-optical composite structures TAG/YAG and YAG/TAG/YAG are developed and investigated.The optimal manufacturing technology and optimal parameters are determined,which will significantly reduce the thermally induced effects due to effective heat dissipation.Faraday isolators are manufactured that significantly exceed their analogues in terms of maximum working laser power.During the implementation of the project,data will be obtained that will allow:to determine the effect of thermal effects on the performance of laser assemblies made on the basis of the studied materials;to determine the optimal method of heat dissipation and the geometry of the elements;to develop the most effective ways to compensate for parasitic thermal effects.This will allow you to compare the studied materials with widely known ones and analyze the prospects for their use.The research carried out will make it possible to develop and manufacture laser nodes with record characteristics for laser sources with both high peak and average power.The obtained data will be used for calculating thermally induced effects in laser elements made of the considered materials,for determining element geometry and optimal method for organizing hint sink,and for choosing the most efficient ways of compensating for parasitic thermal effects.The materials of interest will be compared with the widely used materials,and prospects for their application will be assessed.The undertaken efforts will permit us to develop and manufacture laser components with record characteristics for high-power laser sources with high peak power and simultaneously high average power.[1]I.Kuznetsov,I.Mukhin,O.Palashov,and K.-I.Ueda,"Thin-rod Yb:YAG amplifiers for high average and peak power lasers,"Opt.Lett.vol.43,pp.3941-3944,2018.[2]I.Kuznetsov,I.Mukhin,O.Palashov,and K.-I.Ueda,"Thin-tapered-rod Yb:YAG laser amplifier,"Opt.Lett.vol.41,pp.5361-5364,2016.[3]I.Kuznetsov,N.Emelyanov,S.Chizhov,and O.Palashov,"Along-the-side pump concept for rod laser amplifiers with high average power,"in Frontiers in Optics+Laser Science 2021,Washington,DC,2021,JTu1A.100.

Application Abstract: Annotation:High-quality laser radiation with high peak power and,at the same time,high time-average power is required for many practical and fundamental applications.Power enhancement without quality loss makes it possible to significantly speed up production processes,to increase the efficiency of various nonlinear processes,and also expand the range of tasks themselves.This is relevant in various scientific and technological applications:radiation transformations,particle acceleration,the creation of lasers for lithography systems,material processing,and medical applications.The simultaneous high average and peak powers impose significant and sometimes mutually exclusive limitations on the used materials,the geometry of active and magneto-active elements,and optical schemes of laser generators,amplifiers and Faraday isolators.With an increase of the pulse repetition rate,the average radiation power increases and parasitic thermal effects arise in the optical elements.Consequently,the used materials must possess high mechanical and thermo-optical properties.The search for and application of new laser materials possessing a combination of these characteristics is a topical task.Active laser elements and magneto-optical elements of Faraday devices(Faraday isolators,rotators and mirrors)are most susceptible to parasitic thermal effects,which give rise to inhomogeneous polarization and phase distortions,focal spot smearing,radiation bifocusing,beam quality deterioration,power loss,and reduced efficiency of polarization devices.An essential way of solving this problem is to improve the corresponding characteristics of laser materials,as well as to search for,create and use new materials with better thermo-optical properties,and to develop new methods for suppressing thermal effects on the basis of their material features.The main objective of the project is the manufacture of promising laser materials for lasers with high average and high peak power and investigation of theirs properties using original methods.The objects of the study are laser media codoped with Yb,and Nd ions based on single-crystal fluorides(CaF2)and sesquioxide ceramics(Lu2O3);and magneto-optic paramagnetic ceramics(Tb3Al5O12),and fluorides(CeF3,PrF3).These materials can be grown with high quality by colleagues from SIC CAS,and have desirable characteristics.New geometries of optical elements from these materials are also being investigated-crystalline fibers and composite elements that allow efficient heat dissipation,thereby reducing parasitic effects.The obtained data will be used for calculating thermally induced effects in laser elements made of the considered materials,for determining element geometry and optimal method for organizing hint sink,and for choosing the most efficient ways of compensating for parasitic thermal effects.The materials of interest will be compared with the widely used materials,and prospects for their application will be assessed.The undertaken efforts will permit us to develop and manufacture laser components with record characteristics for high-power laser sources with high peak power and simultaneously high average power.Expected results:The next outcomes will be obtained as a results of the project:-The spectral,optical and laser properties of Lu2O3 ceramics and single crystals of calcium fluoride,co-doped with Yb and Nd ions,depending on the degree of doping of each of the dopants,have been studied.The characteristics of the samples are compared with existing analogues(Yb:YAG,Yb:YLF,etc.).-The possibility of generating extremely short pulses for these materials are studied.The thermo-optical characteristics of the materials are measured and compared with the widely used aluminum-yttrium garnet laser material,and the main advantages and disadvantages are highlighted.Based on the systematic studies,most effective media,compositions of sintering additives,sintering and post-processing regimes,and geometry for the manufacture of active laser elements for both high average and peak power are selected.Laser components and technical processes are tested and laser heads with an effective heat sink are implemented.As a result of the project,a unique material base will be prepared for the implementation of a laser with both high average and peak power with record radiation parameters.-The possibility of increasing the gain bandwidth is investigated both by combining several materials with shifted maxima of the gain spectrum in one amplifier,and by using media with simultaneous doping with Nd and Yb ions.-The optical and thermo-optical characteristics of single crystal fibers from CaF2 are studied,the prospects for their use in lasers with high average and peak power are determined,optimal parameters are calculated taking into account the possibilities for their manufacture.-Signal amplification and thermal effects in the media under consideration are simulated for various geometries of active elements and pumping schemes,including the geometries of a thin rod[1],a thin conical rod[2],pumping geometry along lateral surface[3],etc.Based on the calculation results,laser amplifiers are developed using optimal geometry of the active element and pumping system for each medium.The amplification of a pulse-periodic signal with an ultrashort pulse duration is demonstrated.The obtained results allows to create laser sources that surpass existing analogues in terms of average and peak power.-The parameters of magneto-optical TAG ceramics and CeF3 and PrF3 crystals media are studied.The research includes parameters important for high peak power:the threshold of laser-induced damage(LIDT)and the thermal shock parameter.A Faraday isolators based on a traditional scheme for high-power laser radiation,and with thermal lens compensation based on media with different signs of the thermo-optical coefficient(TAG/CeF3,TGG/CeF3)are created and experimentally investigated.-Magneto-optical composite structures TAG/YAG and YAG/TAG/YAG are developed and investigated.The optimal manufacturing technology and optimal parameters are determined,which will significantly reduce the thermally induced effects due to effective heat dissipation.Faraday isolators are manufactured that significantly exceed their analogues in terms of maximum working laser power.During the implementation of the project,data will be obtained that will allow:to determine the effect of thermal effects on the performance of laser assemblies made on the basis of the studied materials;to determine the optimal method of heat dissipation and the geometry of the elements;to develop the most effective ways to compensate for parasitic thermal effects.This will allow you to compare the studied materials with widely known ones and analyze the prospects for their use.The research carried out will make it possible to develop and manufacture laser nodes with record characteristics for laser sources with both high peak and average power.The obtained data will be used for calculating thermally induced effects in laser elements made of the considered materials,for determining element geometry and optimal method for organizing hint sink,and for choosing the most efficient ways of compensating for parasitic thermal effects.The materials of interest will be compared with the widely used materials,and prospects for their application will be assessed.The undertaken efforts will permit us to develop and manufacture laser components with record characteristics for high-power laser sources with high peak power and simultaneously high average power.[1]I.Kuznetsov,I.Mukhin,O.Palashov,and K.-I.Ueda,"Thin-rod Yb:YAG amplifiers for high average and peak power lasers,"Opt.Lett.vol.43,pp.3941-3944,2018.[2]I.Kuznetsov,I.Mukhin,O.Palashov,and K.-I.Ueda,"Thin-tapered-rod Yb:YAG laser amplifier,"Opt.Lett.vol.41,pp.5361-5364,2016.[3]I.Kuznetsov,N.Emelyanov,S.Chizhov,and O.Palashov,"Along-the-side pump concept for rod laser amplifiers with high average power,"in Frontiers in Optics+Laser Science 2021,Washington,DC,2021,JTu1A.100.