Mid-infrared (MIR) laser sources operating in the 2.7–3μm spectral region have attracted extensive attention for many applications due to the unique features of locating at the atmospheric transparency window,corres...Mid-infrared (MIR) laser sources operating in the 2.7–3μm spectral region have attracted extensive attention for many applications due to the unique features of locating at the atmospheric transparency window,corresponding to the"characteristic fingerprint"spectra of several gas molecules,and strong absorption of water.Over the past two decades,significant developments have been achieved in 2.7–3μm MIR lasers benefiting from the sustainable innovations in laser technology and the great progress in material science.Here,we mainly summarize and review the recent progress of MIR bulk laser sources based on the rare-earth ions-doped crystals in the 2.7–3μm spectral region,including Er3+-,Ho3+-,and Dy3+-doped crystalline lasers.The outlooks and challenges for future development of rare-earth-doped MIR bulk lasers are also discussed.展开更多
In this paper,a high-power and high-efficiency 4.3μm mid-infrared(MIR)optical parametric oscillator(OPO)based on ZnGeP_(2)(ZGP)crystal is demonstrated.An acousto-optically Q-switched Ho Y_(3)Al_(5)O_(12) laser operat...In this paper,a high-power and high-efficiency 4.3μm mid-infrared(MIR)optical parametric oscillator(OPO)based on ZnGeP_(2)(ZGP)crystal is demonstrated.An acousto-optically Q-switched Ho Y_(3)Al_(5)O_(12) laser operating at 2.1μm with a maximum average output power of 35 W and pulse width of 38 ns at a repetition rate of 15 kHz is established and employed as the pump source.A doubly resonant OPO is designed and realized with the total MIR output power of 13.27 W,including the signal and idler output power of 2.65 W at 4.07μm and 10.62 W at 4.3μm.The corresponding total optical-to-optical and slope efficiencies are 37.9%and 67.1%,respectively.The shortest pulse width,beam quality factor,and output power instability are measured to be 36 ns,M_(x)^(2)=1.8,M_(y)^(2)=2.0,and RMS<1.9%at 8 h,respectively.Our results pave a way for designing high-power and high-efficiency 4–5μm MIR laser sources.展开更多
In this paper,the absorption and fluorescence spectra of Er^(3+),Pr^(3+)co-doped LiYF_(4)(Er,Pr:YLF)crystal were measured and analyzed.The Pr^(3+)co-doping was proved to effectively enhance the Er^(3+)∶^(4)I_(11/2)→...In this paper,the absorption and fluorescence spectra of Er^(3+),Pr^(3+)co-doped LiYF_(4)(Er,Pr:YLF)crystal were measured and analyzed.The Pr^(3+)co-doping was proved to effectively enhance the Er^(3+)∶^(4)I_(11/2)→^(4)I_(13/2)mid-infrared transition at the 2.7μm with 74.1%energy transfer efficiency from Er^(3+)∶^(4)I_(13/2)to Pr^(3+)∶^(3)F_(4).By using the Judd–Ofelt theory,the stimulated emission cross section was calculated to be 1.834×10^(-20)cm^(2)at 2685 nm and 1.359×10^(-20)cm^(2)at 2804.6 nm.Moreover,a diode-end-pumped Er,Pr:YLF laser operating at 2659 nm was realized for the first time,to the best of our knowledge.The maximum output power was determined to be 258 m W with a slope efficiency of 7.4%,and the corresponding beam quality factors m^(2)_x=1.29 and m^(2)_(y)=1.25.Our results suggest that Er,Pr:YLF should be a promising material for 2.7μm laser generation.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 61975095, 61975097, and 61308042)the Young Scholars Program of Shandong University (No. 2017WLJH48)+1 种基金the Youth Cross Innovation Group of Shandong University (No. 2020QNQT)the Financial Support from Qilu Young Scholar of Shandong University
文摘Mid-infrared (MIR) laser sources operating in the 2.7–3μm spectral region have attracted extensive attention for many applications due to the unique features of locating at the atmospheric transparency window,corresponding to the"characteristic fingerprint"spectra of several gas molecules,and strong absorption of water.Over the past two decades,significant developments have been achieved in 2.7–3μm MIR lasers benefiting from the sustainable innovations in laser technology and the great progress in material science.Here,we mainly summarize and review the recent progress of MIR bulk laser sources based on the rare-earth ions-doped crystals in the 2.7–3μm spectral region,including Er3+-,Ho3+-,and Dy3+-doped crystalline lasers.The outlooks and challenges for future development of rare-earth-doped MIR bulk lasers are also discussed.
基金supported by the National Key Research and Development Program of China (No. 2017YFB0405204)National Research Foundation of China (No. 61975095)+3 种基金Youth Cross Innovation Group of Shandong University (No. 2020QNQT)Development Program of Shaanxi Province(No.S2019-YF-ZDCXL-ZDLGY-0253)Major Science and Technology Innovation Project of Shandong Province (No. 2019JZZY020206)Qilu Young Scholar of Shandong University
文摘In this paper,a high-power and high-efficiency 4.3μm mid-infrared(MIR)optical parametric oscillator(OPO)based on ZnGeP_(2)(ZGP)crystal is demonstrated.An acousto-optically Q-switched Ho Y_(3)Al_(5)O_(12) laser operating at 2.1μm with a maximum average output power of 35 W and pulse width of 38 ns at a repetition rate of 15 kHz is established and employed as the pump source.A doubly resonant OPO is designed and realized with the total MIR output power of 13.27 W,including the signal and idler output power of 2.65 W at 4.07μm and 10.62 W at 4.3μm.The corresponding total optical-to-optical and slope efficiencies are 37.9%and 67.1%,respectively.The shortest pulse width,beam quality factor,and output power instability are measured to be 36 ns,M_(x)^(2)=1.8,M_(y)^(2)=2.0,and RMS<1.9%at 8 h,respectively.Our results pave a way for designing high-power and high-efficiency 4–5μm MIR laser sources.
基金supported by the National Research Foundation of China(No.61975095)the Young Scholars Program of Shandong University(No.2017WLJH48)+3 种基金the Youth Cross Innovation Group of Shandong University(No.2020QNQT)the Department of Science and Technology of Shandong Province(No.2019JZZY020206)the Natural Science Foundation of Ningbo(No.202003N4099)the Shenzhen Science and Technology Research and Development Funds(No.JCYJ20180305163932273)。
文摘In this paper,the absorption and fluorescence spectra of Er^(3+),Pr^(3+)co-doped LiYF_(4)(Er,Pr:YLF)crystal were measured and analyzed.The Pr^(3+)co-doping was proved to effectively enhance the Er^(3+)∶^(4)I_(11/2)→^(4)I_(13/2)mid-infrared transition at the 2.7μm with 74.1%energy transfer efficiency from Er^(3+)∶^(4)I_(13/2)to Pr^(3+)∶^(3)F_(4).By using the Judd–Ofelt theory,the stimulated emission cross section was calculated to be 1.834×10^(-20)cm^(2)at 2685 nm and 1.359×10^(-20)cm^(2)at 2804.6 nm.Moreover,a diode-end-pumped Er,Pr:YLF laser operating at 2659 nm was realized for the first time,to the best of our knowledge.The maximum output power was determined to be 258 m W with a slope efficiency of 7.4%,and the corresponding beam quality factors m^(2)_x=1.29 and m^(2)_(y)=1.25.Our results suggest that Er,Pr:YLF should be a promising material for 2.7μm laser generation.
