Electron–phonon coupling can tailor electronic transition processes and result in direct lasing far beyond the fluorescence spectrum.The applicable time scales of these kinds of multiphonon-assisted lasers determine ...Electron–phonon coupling can tailor electronic transition processes and result in direct lasing far beyond the fluorescence spectrum.The applicable time scales of these kinds of multiphonon-assisted lasers determine their scientific boundaries and further developments,since the response speed of lattice vibrations is much slower than that of electrons.At present,the temporal dynamic behavior of multiphononassisted lasers has not yet been explored.Herein,we investigate the Q-switched laser performance of ytterbium-doped YCa_(4)OðBO_(3)Þ_(3)(Yb:YCOB)crystal with phonon-assisted emission in nanosecond scales.Using different Q-switchers,the three-phonon-assisted lasers around 1130 nm were realized,and a stable Q-switching was realized in the time domain from submicroseconds to tens of nanoseconds.To the best of our knowledge,this is the longest laser wavelength in all pulse Yb lasers.The minimum pulse width and maximum pulse energy are 29 ns and 204μJ,respectively.These results identify that the electron–phonon coupling is a fast physical process,at least much faster than the present nanosecond pulse width,which supports the operation of multiphonon-assisted lasers in the nanosecond range.In addition,we also provide a simple setup to create pulse lasers at those wavelengths with weak spontaneous emission.Keywords:pulse lasers;electron–phonon coupling;nanoseconds;Q-switch.展开更多
High-power diode-pumped solid-state lasers(DPSSLs)can support many important applications owing to their simple setup and high efficiency.However,the thermal effect in the laser crystal is a major limiting factor for ...High-power diode-pumped solid-state lasers(DPSSLs)can support many important applications owing to their simple setup and high efficiency.However,the thermal effect in the laser crystal is a major limiting factor for laser power improvement.Here,we originally present a quasi-continuous-wave(QCW)diode-pumped monolithic Yb^(3+)-doped YCa_(4)O(BO_(3))_(3)(Yb:YCOB)laser and realize the power scaling at room temperature by removing the heat efficiently.The Yb:YCOB laser at 1024 nm is designed with a quantum efficiency of 95%.A high-power QCW laser is realized with an output peak power of up to 226.7 W,a pulse energy of 12.2 m J,and an optical-to-optical efficiency of 41.2%.To the best of our knowledge,this result represents the record peak power in Yb:YCOB lasers and should have promising applications in some modern devices requiring high-power and large-energy lasers.展开更多
In this Letter,we realized the phonon-assisted Q-switched laser operation in Yb:YCOB crystal.Differing from previous laser wavelengths below 1.1μm,we extended the wavelength to 1130 nm by amplifying multiphonon-assis...In this Letter,we realized the phonon-assisted Q-switched laser operation in Yb:YCOB crystal.Differing from previous laser wavelengths below 1.1μm,we extended the wavelength to 1130 nm by amplifying multiphonon-assisted electronic transitions.At a repetition rate of 0.1 k Hz,the laser output power was 82 m W with a pulse width of 466.1 ns,corresponding to a high peak power of 1.76 k W and a single pulse energy of 0.82 m J,respectively.To the best of our knowledge,this represents the highest pulse energy among all Yb^(3+)-doped crystal lasers at the wavelength beyond 1.1μm.Such a large pulse energy could be explained by the laser rate-equation theory.These results indicated that the electron-phonon coupling effect not only extends the lasing wavelengths but also enables a fast temporal response to support nanosecond,picosecond,even femtosecond pulse laser operation.展开更多
基金supported by the National Key Research and Development Program of China(Grant Nos.2021YFA0717800 and 2021YFB3601504)the National Natural Science Foundation of China(Grant Nos.52025021,51890863,and 52002220)the Future Plans of Young Scholars at Shandong University。
文摘Electron–phonon coupling can tailor electronic transition processes and result in direct lasing far beyond the fluorescence spectrum.The applicable time scales of these kinds of multiphonon-assisted lasers determine their scientific boundaries and further developments,since the response speed of lattice vibrations is much slower than that of electrons.At present,the temporal dynamic behavior of multiphononassisted lasers has not yet been explored.Herein,we investigate the Q-switched laser performance of ytterbium-doped YCa_(4)OðBO_(3)Þ_(3)(Yb:YCOB)crystal with phonon-assisted emission in nanosecond scales.Using different Q-switchers,the three-phonon-assisted lasers around 1130 nm were realized,and a stable Q-switching was realized in the time domain from submicroseconds to tens of nanoseconds.To the best of our knowledge,this is the longest laser wavelength in all pulse Yb lasers.The minimum pulse width and maximum pulse energy are 29 ns and 204μJ,respectively.These results identify that the electron–phonon coupling is a fast physical process,at least much faster than the present nanosecond pulse width,which supports the operation of multiphonon-assisted lasers in the nanosecond range.In addition,we also provide a simple setup to create pulse lasers at those wavelengths with weak spontaneous emission.Keywords:pulse lasers;electron–phonon coupling;nanoseconds;Q-switch.
基金supported by the National Key Research and Development Program of China(Nos.2021YFA0717800,2021YFB3601504,and 2023YFF0718801)the National Natural Science Foundation of China(Nos.52025021,52422201,52372010,and U23A20558)+1 种基金the Natural Science Foundation of Shandong Province(No.ZR2023ZD53)the Future Plans of Young Scholars at Shandong University。
文摘High-power diode-pumped solid-state lasers(DPSSLs)can support many important applications owing to their simple setup and high efficiency.However,the thermal effect in the laser crystal is a major limiting factor for laser power improvement.Here,we originally present a quasi-continuous-wave(QCW)diode-pumped monolithic Yb^(3+)-doped YCa_(4)O(BO_(3))_(3)(Yb:YCOB)laser and realize the power scaling at room temperature by removing the heat efficiently.The Yb:YCOB laser at 1024 nm is designed with a quantum efficiency of 95%.A high-power QCW laser is realized with an output peak power of up to 226.7 W,a pulse energy of 12.2 m J,and an optical-to-optical efficiency of 41.2%.To the best of our knowledge,this result represents the record peak power in Yb:YCOB lasers and should have promising applications in some modern devices requiring high-power and large-energy lasers.
基金the National Natural Science Foundation of China(Nos.52372010,92163207,and 52025021)the National Key Research and Development Program of China(Nos.2021YFA0717800 and 2021YFB3601504)。
文摘In this Letter,we realized the phonon-assisted Q-switched laser operation in Yb:YCOB crystal.Differing from previous laser wavelengths below 1.1μm,we extended the wavelength to 1130 nm by amplifying multiphonon-assisted electronic transitions.At a repetition rate of 0.1 k Hz,the laser output power was 82 m W with a pulse width of 466.1 ns,corresponding to a high peak power of 1.76 k W and a single pulse energy of 0.82 m J,respectively.To the best of our knowledge,this represents the highest pulse energy among all Yb^(3+)-doped crystal lasers at the wavelength beyond 1.1μm.Such a large pulse energy could be explained by the laser rate-equation theory.These results indicated that the electron-phonon coupling effect not only extends the lasing wavelengths but also enables a fast temporal response to support nanosecond,picosecond,even femtosecond pulse laser operation.
