[1] [1] LI P X, YANG Ch, YAO Y F, et al. Research progress of 980 nm optical fiber laser [J]. Laser & Optoelectronics Progress, 2013, 50 (10): 100001(in Chinese).

[2] [2] HAN K, MA Y X, WANG X L, et al. Progress of high power Tm-doped fiber laser [J]. Laser & Optoelectronics Progress, 2010, 47 (10): 101406(in Chinese).

[3] [3] SUN G Y, YANG J, QU R H, et al. Research and progress of multiwavelength Erbium-doped fiber lasers [J]. Laser & Optoelectronics Progress, 2014, 51(9): 90004(in Chinese).

[4] [4] KIRSCH D C, CHEN S, SIDHARTHAN R, et al. Short-wave IR ultrafast fiber laser systems:Current challenges and prospective applications[J]. Journal of Applied Physics, 2020, 128(18): 180906.

[5] [5] MINGAREEV I, WEIRAUCH F, OLOWINSKY A, et al. Welding of polymers using a 2 μm thulium fiber laser[J]. Optics & Laser Technology, 2012, 44(7): 2095-2099.

[6] [6] WOOD J, TURNER P H. Monitoring of itaconic acid hydrogenation in a trickle bed reactor using fiber-optic coupled near-infrared spectroscopy[J]. Applied Spectroscopy, 2003, 57(3): 293-298.

[7] [7] MAEDA Y, YAMADA M, ENDO T, et al. 1700 nm ASE light source and its application to mid-infrared spectroscopy[C]//2014 OptoElectronics and Communication Conference and Australian Conference on Optical Fibre Technology. Melbourne, Australia: IEEE, 2014: 410-411.

[8] [8] CHAMBERS P, AUSTIN E A D, DAKIN J P. Theoretical analysis of a methane gas detection system, using the complementary source mo-dulation method of correlation spectroscopy[J]. Measurement Science and Technology, 2004, 15(8): 1629-1636.

[9] [9] BASHKATOV A N, GENINA E A, KOCHUBEY V I, et al. Optical properties of the subcutaneous adipose tissue in the spectral range 400-2500 nm[J]. Optics and Spectroscopy, 2005, 99(5): 836-842.

[10] [10] HORTON N G, WANG K, KOBAT D, et al. In vivo three-photon microscopy of subcortical structures within an intact mouse brain[J]. Nature Photonics, 2013, 7(3): 205-209.

[11] [11] TANAKA M, HIRANO M, MURASHIMA K, et al. 1.7 μm spectroscopic spectral-domain optical coherence tomography for imaging lipid distribution within blood vessel[J]. Optics Express, 2015, 23(5): 6645-6655.

[12] [12] GUESMI K, ABDELADIM L, TOZER S, et al. Dual-color deep-ti-ssue three-photon microscopy with a multiband infrared laser[J]. Light: Science & Applications, 2018, 7(1): 1-9.

[13] [13] AKHOUNDI F, QIN Y, PEYGHAMBARIAN N, et al. Compact fiber-based multi-photon endoscope working at 1700 nm[J]. Biome-dical Optics Express, 2018, 9(5): 2326-2335.

[14] [14] LU Y, LI Zh L, WANG X Ch, et al. Development of 50 kHz intravascular swept source coherence tomography system[J]. Chinese Journal of Lasers, 2017, 44 (2): 0207001(in Chinese).

[15] [15] WU M, JANSEN K, VAN DER STEEN A F W, et al. Specific imaging of atherosclerotic plaque lipids with two-wavelength intravascular photoacoustics[J]. Biomedical Optics Express, 2015, 6(9): 3276-3286.

[16] [16] ALEXANDER V V, KE K, XU Z, et al. Photothermolysis of sebaceous glands in human skin ex vivo with a 1, 708 nm Raman fiber laser and contact cooling[J]. Lasers in Surgery and Medicine, 2011, 43(6): 470-480.

[17] [17] HASEGAWA T, SOGAWA I, SUGANUMA H. A near infrared angioscope visualizing lipid within arterial vessel wall based on multi-spectral image in 1.7 μm wavelength band[C]//Endoscopic Microscopy Ⅷ. San Francisco, California, USA: International Society for Optics and Photonics, 2013: 8575-8581.

[18] [18] BUMA T, CONLEY N C, CHOI S W. Multispectral photoacoustic microscopy of lipids using a pulsed supercontinuum laser[J]. Biomedical Optics Express, 2018, 9(1): 276-288.

[19] [19] ZHANG Y, ZHANG P, LIU P, et al. Fiber light source at 1.7 μm waveland and its application [J].Laser & Optoelectronics Progress, 2016, 53(9):090002(in Chinese).

[20] [20] LI H, HUANG W, CUI Y L, et al.Progress and prospect of fiber lasers operating at 1.7 μm band [J]. Laser & Optoelectronics Progress, 2022, 59（19）: 1900001(in Chinese).

[21] [21] ZHAN Z Y, CHEN J X, LIU M, et al. Recent progress of 1.7 μm ultrafast fiber laser (invited) [J]. Infrared and Laser Engineering, 2022, 51(1): 223-237(in Chinese).

[22] [22] AGGER S, POVLSEN J H, VARMING P. Single-frequency thulium-doped distributed-feedback fiber laser[J]. Optics Letters, 2004, 29(13): 1503-1505.

[23] [23] ZHU H, GUO J, DUAN Y, et al. Efficient 1.7 μm light source based on KTA-OPO derived by Nd∶YVO4 self-Raman laser[J]. Optics Letters, 2018, 43(2): 345-348.

[24] [24] SUN J J, CHEN Y, ZHANG K, et al. Efficient continuous wave and acousto-optical Q-switched Tm∶Lu2O3 laser pumped by the laser diode at 1.7 μm[J]. Infrared Physics & Technology, 2021, 116: 103771.

[25] [25] TILMA B W, JIAO Y, KOTANI J, et al. Integrated tunable quantum-dot laser for optical coherence to mography in the 1.7 μm wavelengthregion[J]. IEEE Journal of Quantum Electronics, 2012, 48(2): 87-98.

[26] [26] XU J, WANG L, LIU J, et al. Narrow line-wide 1653 nm Raman fiber amplifiers [J]. Chinese Journal of Lasers, 2013, 40(6): 0602001(in Chinese).

[27] [27] YAMADA M, ONO H, OHTA K, et al. 1.7 μm band optical fiber amplifier[C]//Optical Fiber Communication Conference. San Francisco, California, USA: Optical Society of America, 2014: Tu2D.

[28] [28] LI Z, ALAM S U, DANIEL J M O, et al. 90 nm gain extension towards 1.7 μm for diode-pumped silica-based thulium-doped fiber amplifiers[C]//2014 The European Conference on Optical Communication (ECOC). Cannes, France: IEEE, 2014: 1-3.

[29] [29] EMAMI S D, KHODAEI A, GANDAN S, et al. Thulium-doped fiber laser utilizing a photonic crystal fiber-based optical low-pass filter with application in 1.7 μm and 1.8 μm band[J]. Optics Express, 2015, 23(15): 19681-19688.

[30] [30] LI Z, JUNG Y, DANIEL J M O, et al. Extreme short wavelength operation (1.65-1.7 μm) of silica-based thulium-doped fiber amplifier[C]//Optical Fiber Communication Conference. Los Angeles, California, USA: Optical Society of America, 2015: Tu2C.

[31] [31] ISHIDA S, NISHIZAWA N, OHTA T, et al. Ultrahigh-resolution optical coherence tomography in 1.7 μm region with fiber laser supercontinuum in low-water-absorption samples[J]. Applied Physics Express, 2011, 4(5): 052501.

[32] [32] KAWAGOE H, ISHIDA S, ARAMAKI M, et al. Development of a high power supercontinuum source in the 1.7 μm wavelength region for highly penetrative ultrahigh-resolution optical coherence tomography[J]. Biomedical Optics Express, 2014, 5(3): 932-943.

[33] [33] LI Z, JUNG Y, DANIEL J M O, et al. Exploiting the short wavelength gain of silica-based thulium-doped fiber amplifiers[J]. Optics Letters, 2016, 41(10): 2197-2200.

[34] [34] CREEDEN D, JOHNSON B R, RINES G A, et al. High power re-sonant pumping of Tm-doped fiber amplifiers in core-and cladding-pumped configurations[J]. Optics Express, 2014, 22(23): 29067-29080.

[35] [35] SHEN D Y, SAHU J K, CLARKSON W A. High-power widely tunable Tm∶fibre lasers pumped by an Er, Yb co-doped fibre laser at 1.6 μm[J]. Optics Express, 2006, 14(13): 6084-6090.

[36] [36] DANIEL J M O, SIMAKOV N, TOKURAKAWA M, et al. Ultra-short wavelength operation of a thulium fibre laser in the 1660-1750 nm wavelength band[J]. Optics Express, 2015, 23(14): 18269-18276.

[37] [37] PARK J, RYU S, YEOM D I. All-fiber Tm-Ho codoped laser ope-rating at 1700 nm[J]. Current Optics and Photonics, 2018, 2(4): 356-360.

[38] [38] BURNS M D, SHARDLOW P C, BARUA P, et al. 47 W continuous-wave 1726 nm thulium fiber laser core-pumped by an erbium fiber laser[J]. Optics Letters, 2019, 44(21): 5230-5233.

[39] [39] FIRSTOV S V, ALYSHEV S V, RIUMKIN K E, et al. Watt-level, continuous-wave bismuth-doped all-fiber laser operating at 1.7 μm[J]. Optics Letters, 2015, 40(18): 4360-4363.

[40] [40] DIANOV E M, FIRSTOV S V, KHOPIN V F, et al. Bismuth-doped fibers and fiber lasers for a new spectral range of 1600-1800 nm[C]//Fiber Lasers ∶Technology, Systems, and Applications. San Francisco, California, USA: International Society for Optics and Photonics, 2016: 9728.

[41] [41] FIRSTOV S V, ALYSHEV S V, RIUMKIN K E, et al. Laser-active fibers doped with bismuth for a wavelength region of 1.6-1.8 μm[J]. IEEE Journal of Selected Topics in Quantum Electronics, 2018, 24(5): 1-15.

[42] [42] NEMOVA G, QIAO J, CHEN L R, et al. Dual-wavelength, cascaded cavities bismuth-doped fiber laser in 1.7 μm wavelength range[C]// Fiber Lasers ⅩⅥ: Technology and Systems.San Francisco, California, USA: International Society for Optics and Photonics, 2019, 10897.

[43] [43] THOUROUDE R, GILLES H, CADIER B, et al. Linearly-polarized high-power Raman fiber lasers near 1670 nm[J]. Laser Physics Let-ters, 2019, 16(2): 025102.

[44] [44] THOUROUDE R, GILLES H, ROBIN T, et al. Efficient random Raman fiber laser at 1650 nm[C]//Applications of Lasers for Sensing and Free Space Communications. Vienna, Austria: Optical Society of America, 2019: JTh3A.

[45] [45] LEHNEIS R, STEINMETZ A, LIMPERT J, et al. All-fiber pulse shortening of passively Q-switched microchip laser pulses down to sub-200 fs[J]. Optics Letters, 2014, 39(20): 5806-5809.

[46] [46] ZHANG Z, YAN Z, ZHOU K, et al. All-fiber 250 MHz fundamental repetition rate pulsed laser with tilted fiber grating polarizer[J]. Laser Physics Letters, 2015, 12(4): 045102.

[47] [47] ZHAO C, ZHANG H, QI X, et al. Ultra-short pulse generation by a topological insulator based saturable absorber[J]. Applied Physics Letters, 2012, 101(21): 211106.

[48] [48] ZHANG Z, MOU C, YAN Z, et al. Sub-100 fs mode-locked erbium-doped fiber laser using a 45°-tilted fiber grating[J]. Optics Express, 2013, 21(23): 28297-28303.

[49] [49] OBER M H, HOFER M, FERMANN M E. 42-fs pulse generation from a mode-locked fiber laser started with a moving mirror[J]. Optics Letters, 1993, 18(5): 367-369.

[50] [50] NGUYEN T N, KIEU K, CHURIN D, et al. High power soliton self-frequency shift with improved flatness ranging from 1.6 to 1.78 μm[J]. IEEE Photonics Technology Letters, 2013, 25(19): 1893-1896.

[51] [51] NORONEN T, OKHOTNIKOV O, GUMENYUK R. Electronically tunable thulium-holmium mode-locked fiber laser for the 1700-1800 nm wavelength band[J]. Optics Express, 2016, 24(13): 14703-14708.

[52] [52] CHUNG H Y, LIU W, CAO Q, et al. Er-fiber laser enabled, energy scalable femtosecond source tunable from 1.3 to 1.7 μm[J]. Optics Express, 2017, 25(14): 15760-15771.

[53] [53] KHEGAI A, MELKUMOV M, RIUMKIN K, et al. NALM-based bismuth-doped fiber laser at 1.7 μm[J]. Optics Letters, 2018, 43(5): 1127-1130.

[54] [54] CHEN S, CHEN Y, LIU K, et al. W-type normal dispersion thulium-doped fiber-based high-energy all-fiber femtosecond laser at 1.7 μm[J]. Optics Letters, 2021, 46(15): 3637-3640.

[55] [55] MORIN P, BOIVINET S, YEHOUESSI J P, et al. Sub-150-fs all-fiber polarization maintaining tunable laser in the mid-infrared[C]// Fiber Lasers ⅩⅦ: Technology and Systems. San Francisco, California, USA: International Society for Optics and Photonics, 2020: 112601M.

[56] [56] GRIMES A, HARIHARAN A, SUN Y, et al. Hundred-watt CW and Joule level pulsed output from Raman fiber laser in 1.7 μm band[C]//Fiber Lasers ⅩⅦ: Technology and Systems. San Francisco, California, USA: International Society for Optics and Photonics, 2020: 112601S.

[57] [57] CHEN S, CHEN Y, LIU K, et al. All-fiber short-wavelength tunable mode-locked fiber laser using normal dispersion thulium-doped fiber[J]. Optics Express, 2020, 28(12): 17570-17580.

[58] [58] XUE G, ZHANG B, YIN K, et al. All-fiber wavelength-tunable Tm/Ho-codoped laser between 1727 nm and 2030 nm[J]. Proceedings of the SPIE, 2015, 9255: 92550U.

[59] [59] XIAO X Sh. 3W narrow-linewidth ultra-short wavelength operation near 1707nm in thulium-doped silica fiber laser with bidirectional pumping[J]. Applied Physics, 2017, B123(4): 1-6.

[60] [60] ZHANG J X, SHENG Q, SUN Sh, et al. 1720 nm narrow-linewidth all-fiber ring laser based on thulium-doped fiber[C]//Fiber Lasers ⅩⅦ: Technology and Systems. San Francisco, California, USA: International Society for Optics and Photonics, 2020:112600V.

[61] [61] ZHANG L, ZHANG J X, SHENG Q, et al. Efficient multi-watt 1720 nm ring-cavity Tm-doped fiber laser[J]. Optics Express, 2020, 28(25): 37910-37918.

[62] [62] ZHANG J X, SHENG Q, ZHANG L, et al. Single-frequency 1.7 μm Tm-doped fiber laser with optical bistability of both power and longitudinal mode behavior[J]. Optics Express, 2021, 29(14): 21409-21417.

[63] [63] ZHANG L, ZHANG J, SHENG Q, et al. Watt-level 1.7 μm single-frequency thulium-doped fiber oscillator[J]. Optics Express, 2021, 29(17): 27048-27056.

[64] [64] ZHANG L, ZHANG J, SHENG Q, et al. 1.7 μm Tm-doped fiber laser intracavity-pumped by an erbium/ytterbium-codoped fiber laser[J]. Optics Express, 2021, 29(16): 25280-25289.

[65] [65] CEN X, GUAN X, YANG C, et al. Short-wavelength, in-band-pumped single-frequency DBR Tm3+-doped germanate fiber laser at 1.7 μm[J]. IEEE Photonics Technology Letters, 2021, 33(7): 350-353.

[66] [66] ZHANG Y, SONG J, YE J, et al. Tunable random Raman fiber laser at 1.7 μm region with high spectral purity[J]. Optics Express, 2019, 27(20): 28800-28807.

[67] [67] FANG X, WANG Z, ZHAN L. Efficient generation of all-fiber femtosecond pulses at 1.7 μm via soliton self-frequency shift[J]. Optical Engineering, 2017, 56(4): 046107.

[68] [68] PEI W, LI H, HUANG W, et al. All-fiber tunable pulsed 1.7 μm fiber lasers based on stimulated raman scattering of hydrogen molecules in hollow-core fibers[J]. Molecules, 2021, 26(15): 4561.

[69] [69] LI H, PEI W, HUANG W, et al. Highly efficient nanosecond 1.7 μm fiber gas Raman laser by H2-filled hollow-core photonic crystal fibers[J]. Crystals, 2021, 11(1): 32-34.

[70] [70] PEI W, LI H, HUANG W, et al. Pulsed fiber laser oscillator at 1.7 μm by stimulated Raman scattering in H2-filled hollow-core photonic crystal fibers[J]. Optics Express, 2021, 29(21): 33915-33925.

[71] [71] CHEN J X, LI X Y, LI T J, et al. 1.7-μm dissipative soliton Tm-doped fiber laser[J]. Photonics Research, 2021, 9(5): 873-878.

[72] [72] DU T, RUAN Q, YANG R, et al. 1.7 μm Tm/Ho-codoped all-fiber pulsed laser based on intermode-beating modulation technique[J]. Journal of Lightwave Technology, 2018, 36(20): 4894-4899.

[73] [73] HE X. Femtosecond fiber laser for deep biological tissue multiphoton [D]. Xi’an: Northwestern University, 2020:61-70(in Chinese).

[74] [74] JELNKOV H, DOROSHENKO M E, ULC J, et al. Laser-diode pumped dysprosium-doped lead thiogallate laser output wavelength temporal evolution and tuning possibilities at 4.3-4.7 μm[C]//So-lid State Lasers ⅩⅩⅤ: Technology and Devices. San Francisco, California, USA: International Society for Optics and Photonics, 2016: 97261A.

[75] [75] QUIMBY R S, SHAW L B, SANGHERA J S, et al. Modeling of cascade lasing in Dy∶chalcogenide glass fiber laser with efficient output at 4.5 μm[J]. IEEE Photonics Technology Letters, 2008, 20(2): 123-125.

[76] [76] LIU Y, YU J L, WANG H J, et al. Tunable multiwavelength Bri-llouin-erbium fiber laser based on feedback fiber loop[J].Chinese Journal of Lasers, 2014, 41 (2): 202003(in Chinese).

[77] [77] MA D, CAI Y, ZHOU C, et al. 37.4 fs pulse generation in an Er∶fiber laser at a 225 MHz repetition rate[J]. Optics Letters, 2010, 35(17): 2858-2860.

[78] [78] HE Y L, LUO H Y, LI J, et al. High power all fiber passively mode-locked thulium-doped fiber laser [J]. High Power all Laser and Particle Beams, 2014, 26 (10): 102-106(in Chinese).

[79] [79] ANSELMO C, WELSCHINGER J Y, CARIOU J P, et al. Gas concentration measurement by optical similitude absorption spectroscopy: Methodology and experimental demonstration[J]. Optics Express, 2016, 24(12): 12588-12599.

[80] [80] ZHU Y J, FAN X H, GAO Ch, et al. Laser gas sensor for open path hydrogen chloride detection[J]. Laser Journal, 2017, 38 (7): 17-20(in Chinese).

[81] [81] TANO Y, TANAKA M, HONDA Y, et al. Evaluation of high alcohol concentration using a 1.7 μm band near-infrared spectroscopy system using multi-mode optical fibers[C]//2018 23rd Opto-Electronics and Communications Conference (OECC). Jeju, Korea: IEEE, 2018: 1-2.

[82] [82] VIZBARAS A, IMONYTE· I, MIASOJEDOVAS A, et al. Swept-wavelength lasers based on GaSb gain-chip technology for non-invasive biomedical sensing applications in the 1.7-2.5 μm wavelength range[J]. Biomedical Optics Express, 2018, 9(10): 4834-4849.

[83] [83] MAJEWSKI M R, WOODWARD R I, JACKSON S D. Dysprosium-doped ZBLAN fiber laser tunable from 2.8 μm to 3.4 μm, pumped at 1.7 μm[J]. Optics Letters, 2018, 43(5): 971-974.

[84] [84] QU Ch B, KANG M Q, XIANG X J, et al. Theoretical study of 4.3 μm dual-wavelength pumped Dy:InF3 high energy med-infrared fiber lasers [J].Chinese Journal of Lasers, 2020, 47(8): 0801003 (in Chinese).

[85] [85] DOROSHENKO M E, JELNKOV H, RˇHA A, et al. Mid-IR (4.4 μm) Zn1-x MnxSe:Cr2+, Fe2+(x=0.3) laser pumped by 1.7 μm laser using Cr2+-Fe2+ energy transfer[J]. Optics Letters, 2019, 44(11): 2724-2727.

[86] [86] LI Y, MURTHY R S, ZHU Y, et al. 1.7-Micron optical coherence tomography angiography for characterization of skin lesions-a feasibility study[J]. IEEE Transactions on Medical Imaging, 2021, 40(9): 2507-2512.

[87] [87] DASA M K, MARKOS C, MARIA M, et al. High-pulse energy supercontinuum laser for high-resolution spectroscopic photoacoustic imaging of lipids in the 1650-1850 nm region[J]. Biomedical Optics Express, 2018, 9(4): 1762-1770.

[88] [88] LI C, SHI J, GONG X, et al. 1.7 μm wavelength tunable gain-switched fiber laser and its application to spectroscopic photoacoustic imaging[J]. Optics Letters, 2018, 43(23): 5849-5852.

[89] [89] LI M Sh, SHI J W, YIU C C Y, et al. Near-infrared double-illumination optical-resolution photoacoustic microscopy[J]. Journal of Biophotonics, 2021, 14(3): e202000392.

[90] [90] LI C, SHI J, WANG X, et al. High-energy all-fiber gain-switched thulium-doped fiber laser for volumetric photoacoustic imaging of lipids[J]. Photonics Research, 2020, 8(2): 160-164.

[91] [91] YOON T I, PARK J S, LEE B H, et al. Brain tumor margin detection using 1.7 μm spectroscopic swept-source OCT[C]//European Conference on Biomedical Optics. Munich, Germany: Optical Society of America, 2021: EW1C. 6(1-3).

[92] [92] DU Q L. 1.7 μm fiber broadband light source and its application in optical coherence tomography system[D]. Changchun: Changchun University of Science and Technology, 2018:1-53(in Chinese).

[93] [93] WU D, ZHANG P, LI X Y, et al. Broadband light source at 1.7 μm based on cascade-modulator pumping[J].Chinese Journal of Lasers, 2019, 46(5): 0506003(in Chinese).

[94] [94] HE Zh X, ZHANG P, WU D, et al. Experimental study of a 1.7 μm tunable multi-wavelength Raman fiber laser based on an amplified spontaneous emission pump[J]. Laser & Optoelectronics Progress, 2020, 57(7): 071403(in Chinese).

[95] [95] HE Zh X. Research on technology of 1.7 μm pulse fiber laser [D]. Changchun: Changchun University of Science and Technology, 2020:1-64(in Chinese).

[96] [96] LI Q, ZHANG P, FAN Y, et al. 1.7 μm gain-switched and mode-locked hybrid Tm-Ho codoped fiber laser signal generation and optimization[J]. Applied Optics, 2022, 61(2): 455-462.