[1] Liang F, Kang L, Lin Z S, et al. Mid-infrared nonlinear optical materials based on metal chalcogenides: Structure-property relationship[J]. Crystal Growth & Design, 2017, 17(4): 2254-2289.
[2] Luo X Y, Li Z, Guo Y W, et al. Recent progress on new infrared nonlinear optical materials with application prospect[J]. Journal of Solid State Chemistry, 2019, 270: 674-687.
[3] Guo Y W, Li Z, Lei Z T, et al. Synthesis, growth of crack-free large-size BaGa4Se7 crystal, and annealing studies[J]. Crystal Growth & Design, 2019, 19 (2): 1282-1287.
[4] Hu S W, Wang L, Guo Y W, et al. High-conversion-efficiency tunable mid-infrared BaGa4Se7 optical parametric oscillator pumped by a 2.79 μm laser[J]. Optics Letters, 2019, 44(9): 2201-2203.
[5] Sun M G, Cao Z S, Yao J Y, et al. Continuous-wave difference-frequency generation based on BaGa4Se7 crystal[J]. Optics Express, 2019, 27(4): 4014-4023.
[6] Kolker D B, Sherstov I V, Kostyukova N Y, et al. Broadband tunable source of mid-IR laser radiation for photoacoustic spectroscopy[J]. Quantum Electronics, 2019, 49(1): 29-34.
[7] He Y X, Guo Y W, Xu D G, et al. High energy and tunable mid-infrared source based on BaGa4Se7 crystal by single-pass difference-frequency generation[J]. Optics Express, 2019, 27(6): 9241-9249.
[8] Kang M Q, Deng Y, Yan X W, et al. A compact and efficient 4.25 μm BaGa4Se7 optical parametric oscillator[J]. Chinese Optics Letters, 2019, 17(12): 121402.
[9] He Y X, Xu D G, Yao J Y, et al. Intracavity-pumped, mid-infrared tandem optical parametric oscillator based on BaGa4Se7 crystal[J]. IEEE Photonics Journal, 2019, 11(6): 1300109.
[10] Yang F, Yao J Y, Guo Y W, et al. High-energy continuously tunable 8～14 μm picosecond coherent radiation generation from BGSe-OPA pumped by 1064 nm laser[J]. Optics and Laser Technology, 2020, 125: 106040.
[11] Zhang Y C, Zuo Y, Li Z, et al. High energy mid-infrared laser pulse output from a BaGa4Se7 crystal-based optical parametric oscillator[J]. Optics Letters, 2020, 45(16): 4595-4598.
[12] Liu G Y, Chen Y, Li Z, et al. High-beam-quality 2.1 μm pumped mid-infrared type-II phase-matching BaGa4Se7 optical parametric oscillator with a ZnGeP2 amplifier[J]. Optics Letters, 2020, 45(13): 3805-3808.
[13] Xu D G, Zhang J X, He Y X, et al. High-energy, tunable, long-wave mid-infrared optical parametric oscillator based on BaGa4Se7 crystal[J]. Optics Letters, 2020, 45(18): 5287-5290.
[14] Badikov V V, Badikov D V, Laptev V B, et al. Crystal growth and characterization of new quaternary chalcogenide nonlinear crystals for the mid-IR: BaGa2GeS6 and BaGa2GeSe6[J]. Optical Materials Express, 2016, 6(9): 2933-2938.
[15] Fang P, Yuan Z R, Chen Y, et al. Growth and device fabrication of new infrared nonlinear optical crystal BaGa2GeSe6[J]. Journal of Synthetic Crystals, 2020, 49(2): 193-194.
[17] Stibenz G, Beutler M, Rimke I, et al. Femtosecond mid-IR difference-frequency generation in BaGa2GeSe6 from a 40 MHz optical parametric oscillator pumped at 1035 nm[C]. Conference on Lasers and Electro-Optics, OSA Technical Digest, 2018, paper STh4F.5.
[18] Matthias B, Marcus B, Martin G, et al. Sub-8 optical cycle, 4～12 μm tunable, μJ-level pulse generation via a BaGa2GeSe6-based, 1.96 μm pumped OPA at 100 kHz[C]. XXIst International Conference on Ultrafast Phenomena UP2018, Hamburg, Germany, 2018, paper WED.3B.2.
[19] Ionin A A, Badikov D V, Badikov V V, et al. Sum frequency generation of multi-line slab radio frequency discharge carbon monoxide laser system with intracavity nonlinear BaGa2GeSe6 crystal[J]. Optics Letters, 2018, 43(18): 4358-4361.
[20] Etxano U, Maidment L, Vamos L, et al. Few-cycle mid-infrared pulses from BaGa2GeSe6[J]. Optics Letters, 2020, 45(13): 3813-3815.
