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New high-power 1.1-??m light source: diode-pumped continuous-wave and passively Q-switched Nd:LuYAG mixed crystal lasers
摘要： 1.1-μm laser operation has been rarely investigated in laser materials other than Nd:YAG. In this report, using a diode end pumping geometry for providing a compact, low-threshold and high-efficiency system, continuous-wave and passively Q-switched Nd:LuYAG mixed crystal lasers at 1.1 μm were demonstrated, for the first time to our knowledge. In continuous-wave mode, a maximum output power up to 6.04 W was achieved at 1112.9 nm, 1116.64 nm and 1122.65 nm with a slope efficiency of 41.8%. Wavelength tuning was obtained from 1112.05 nm to 1123.17 nm discontinuously, which has never been demonstrated in Nd:YAG lasers. Moreover, using a Cr4+:YAG saturable absorber, stable passively Q-switched laser operation was also attained with a maximum average output power up to 1.71 W. The shortest pulse width was about 37.3 ns at repetition rate of about 21.52 kHz. The maximum pulse energy was about 79.3 μJ, which is believed to be the highest pulse energy that has ever been achieved in diode-end-pumped Nd3+ lasers at this specific 1.1 μm emission band.
关键词： 1.1 μm lasers,passive Q-switching,continuous-wave,Nd:LuYAG mixed crystal
更新于2025-09-23 15:19:57
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MXene Ti3C2Tx saturable absorber for passively Q-switched mid-infrared laser operation of femtosecond-lasera??inscribed Er:Y2O3 ceramic channel waveguide
摘要： We report on an Er:Y2O3 ceramic channel waveguide laser operating at continuous-wave and passively Q-switched regimes, for the first time to the best of our knowledge. The Er:Y2O3 ceramic channel waveguide has been fabricated by a femtosecond laser direct-writing technique. The maximum output power reached 123.5 mW in continuous-wave mode with a slope efficiency of about 21%, and the lasing behavior has been found simultaneously at 2710.28, 2716.76, and 2723.18 nm. We have further fabricated an MXene Ti3C2Tx saturable absorber mirror to operate the Er:Y2O3 waveguide in passively Q-switched regime. At the same time, property of the MXene Ti3C2Tx saturable absorber has been characterized, and nonlinear saturable absorption of the saturable absorber has also been measured. The average output power is about 67.6 mW, and the shortest pulse width is about 58.1 ns. This work indicates that femtosecond laser direct writing is a reliable technique for processing mid-infrared ceramic waveguides, and MXene Ti3C2Tx is promising for operating pulsed mid-infrared lasers.
关键词： mid-infrared,MXene Ti3C2Tx saturable absorber,passive Q switching,waveguide
更新于2025-09-23 15:19:57
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Q-switched erbium-doped fiber laser using silver nanoparticles deposited onto side-polished D-shaped fiber by electron beam deposition method
摘要： A stable Q-switched erbium-doped fiber laser (EDFL) is demonstrated using silver nanoparticles (AgNPs) as a passive saturable absorber. A prefabricated D-shaped silica fiber is coated with AgNPs using electron beam deposition method. Four different sizes of D-shaped fiber, which were controlled by observing the loss during the polishing process are used in this study. All four samples with losses of 1.2 dB, 2 dB, 3 dB and 3.5 dB were able to produce Q-switched pulse in 1.5-μm region, with an ability to lase at a threshold of 35.2 mW. Maximum repetition rate was recorded at 66.74 kHz for the D-shaped fiber configured with 3 dB loss, while the narrowest pulse width was obtained at 6.17 μs for 2 dB loss. All samples were also producing pulses at the maximum applicable pump power of 65.7 mW, and output power recorded at that power level are between 5.86 mW and 7.36 mW.
关键词： Laser resonator,Fiber lasers,Passive Q-switching
更新于2025-09-16 10:30:52
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Ni-NPs doped PVA: An efficient saturable absorber for generation multiwavelength Q-switched fiber laser system near 1.5?μm
摘要： We report on the use of Nickel nanoparticles (Ni-NPs) as saturable absorber (SA) to generate Q-switched fiber laser pulses in C-band. The Ni-NPs were incorporated in polyvinyl alcohol (PVA) to produce thin film-based saturable absorber (SA) and integrated into an erbium-doped fiber laser (EDFL) ring cavity to generate passively Q-switching. The Ni-doped PVA SA reveals modulation depth of 15% and a saturation intensity of 200 MW/cm2. Lasing in CW region begins at 77 mW pump power, whereas stable self-starting Q-switching with a central wavelength of 1563.1 nm begins at 85 mW. By fine adjustment of the laser diode pump power up to 236.4 mW dual-, and triple- lasing lines have been observed at 1563.1, 1563.3 and 1563.4 with side mode suppression ratio (SMSR) of more than 49 dB. The proposed laser is useful for generating pulse laser with a minimum pulse width of 1.5 μs and a maximum repetition rate of 56.79 kHz with a pulse energy of about 4.33 nJ at the maximum pump power of 275 mW. The stability of the pulse is verified from the radio-frequency (RF) spectrum with a measured signal-to-noise ratio (SNR) of 44 dB. The ability of Ni-PVA as an effective SA may lead to further development of pulsed fiber laser in the field of photonics.
关键词： Nickel Nanoparticles,Passive Q-switching,Multiwavelength Laser
更新于2025-09-16 10:30:52
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Development of all-fiber Fabry-Perot pulse laser with a fiber type saturable absorber and improvement of the oscillation characteristics
摘要： The authors developed high-concentration erbium doped fiber as a saturable absorber, making use of its concentration quenching. Then, they developed an all-fiber Fabry-Perot pulse laser with high-concentration erbium doped fiber and demonstrated that it enables stable and passive pulse oscillation regardless of disturbance. Furthermore, they successfully improve power efficiency and shortening pulse width to 1.8 μs by optimizing the structure of the fiber laser.
关键词： Er doped fiber,fiber laser,concentration quenching,all-fiber passive Q-switching,fiber-type saturable absorber
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - All Passive KGW/Tm:YAP Raman Laser
摘要： High brightness sources in the 2-3 micron region are essential for many applications including wavelength selective microsurgery, material processing, and gas monitoring. Although there are some rare-earth ions which enable such laser sources like Tm, Ho and Cr, those suitable lasers do not tailor all this spectral range. Solid-state Raman lasers are one of the efficient methods enabling to extend the spectral span of high brightness sources. Over the last five years, this trend was also realized in the 2 micron region, using BaWO4 and YVO4 crystals as Raman gain medium. Having minor thermal lensing and high damage threshold KGd(WO4)2 (KGW) is another promising Raman crystal, implemented until now with 1064 nm and 532 nm. This crystal has two different Raman shifts (901 cm-1 and 768 cm-1), enabling to yield, by control of the polarization orientation, two different stokes wavelengths. Here we present, for the first time, an external-cavity configuration for an all Passive Raman laser, based on passive fundamental pump with a KGW crystal. The KGW being pumped by an end pump CrZnS passively Q-switched Tm:YAP laser emitting at 1935 nm. This laser seed modified from our previous work, in order to achieve the higher peak power for the non-linear effect to take place. The seed had a maximal energy pulse of 1.5 mJ, having a pulse duration of 17 ns at a repetition rate of 1.3 kHz resulting in a peak-power of 90 kW for an average power of 2.1 W. This Raman laser emitted at 2270 nm and 2350 nm having 150 and 104 mW average power, respectively. Pulse duration as short as 12.5 ns and a maximal peak-power of 14.35 kW obtained.
关键词： KGW,Tm:YAP,2-3 micron region,Raman laser,passive Q-switching
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - A Novel Saturable Absorber: Transparent Glass-Ceramics Based on Co <sup>2+</sup> :Li(Al,Ga) <sub/>5</sub> O <sub/>8</sub> Spinel Nanocrystals
摘要： Cobalt ions (Co2+) embedded in tetrahedral (Td) sites are known for their intense absorption around 1.5 μm. Crystals such as spinel, MgAl2O4, doped with Co2+ ions in Td sites are recognized as excellent saturable absorbers (SAs) for eye-safe erbium lasers. Due to the relative difficulty to grow high-quality Co:MgAl2O4 crystals and fixed position of the Co2+ absorption band in spinel single-crystals, other Co2+-doped materials were proposed such as transparent glass-ceramics (GCs) and ceramics based on various spinels [1]. Transparent GCs offer a size-scalable synthesis method based on glass melting technology and variable spectroscopic properties as compared to crystals, and much higher laser induced damage threshold (LIDT) as compared to ceramics. GCs based on MgAl2O4 spinel nanocrystals modified by the addition of Ga3+ cations allow one to extend the SA properties until 1.7 μm [2]. In the present work, we describe the synthesis, structure, optical spectroscopy, nonlinear properties and passive Q-switching (PQS) performance of novel transparent GCs based on Co2+:Li(Al,Ga)5O8 nanocrystals. A lithium gallium aluminosilicate glass nucleated by TiO2 was doped with 0.1 mol% CoO. The GCs were produced by secondary heat-treatments at 680-850 oC for 6 h resulting in highly transparent, blue-colored samples, Fig. 1(a). The precipitation of nanosized spinel crystals was confirmed by XRD and TEM, Fig. 1(b,c), and Raman spectroscopy. The transparent GCs exhibited a broadband absorption band at 1.3-1.65 μm due to the 4A2(4F) → 4T1(4F) transition of Co2+ ions in Td sites in Li(Al,Ga)5O8 nanocrystals, Fig. 2(a). The saturable absoption of GC heat-treated at 750 oC for 6 h was studied by Z-scan method at 1540 nm using ns pulses. The saturation fluence FS is 0.50±0.05 J/cm2 and the LIDT exceeded 20 J/cm2, Fig. 2(b). This transparent GC was used to fabricate a SA for PQS of a compact diode-pumped Er,Yb:glass laser. This laser generated stable 7.4 ns / 1.34 mJ pulses at 1535 nm (peak power: 181 kW). The developed GC are promising as SAs for erbium lasers based on glass and crystalline materials (e.g., Er:YAG lasers emitting at 1617 nm and 1645 nm). This is because the broadband absorption of Co2+ ions in GCs is notably red-shifted as compared to Co:MgAl2O4 crystals which, in turn, is caused by the different spinel nanophase composition.
关键词： transparent glass-ceramics,Ga)5O8,Co2+:Li(Al,spinel nanocrystals,passive Q-switching,saturable absorber
更新于2025-09-11 14:15:04
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A Novel 1,066 nm Nd:Gd0.69Y0.3NbO4 Passively Q-Switched Pulse-Burst Laser
摘要： We demonstrate for the ?rst time a Cr4+:YAG passively Q-switched 1066 nm pulse-burst laser under 879 nm direct pump with a novel Nd:Gd0.69Y0.3NbO4 crystal. The output laser characteristics with di?erent pump repetition rates and di?erent Cr4+:YAG initial transmission are studied. Without the Cr4+:YAG, we obtain a maximum output energy of 2.55 mJ at an absorbed pump energy of 5.79 mJ with the highest 48% slope e?ciency. The pulse-burst laser contains a maximum of 7 pulses for a Cr4+:YAG initial transmission of 55% and a pump repetition rate of 1 kHz. The single-pulse energy and narrowest pulse width reach 160 μJ and 5.5 ns at 38.2 kHz, with a peak power of 32 kW.
关键词： direct pump,passive Q-switching,burst mode,Nd:Gd0.69Y0.3NbO4
更新于2025-09-11 14:15:04
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Alq <sub/>3</sub> saturable absorber for generating Q‐switched pulses in erbium‐doped fiber laser
摘要： Q-switch pulses were successfully produced utilizing an organic saturable absorber (SA) to modulate loss inside an erbium-doped fiber laser (EDFL) cavity. The organic material was tris-(8-hydroxyquinoline) aluminum (Alq3) and it was mixed with polyvinyl alcohol to form a film. The Q-switched EDFL operated at 1564.1 nm and the generated pulses were stable with tunable repetition rates. The repetition rates increased from 45.87 to 68.03 kHz as the pump power was elevated from 42.8 to 84.0 mW. Within this power range, the maximum pulse energy and the shortest pulse width were obtained at 139 nJ and 6.03 μs, respectively. The fundamental frequency of the electrical spectrum has a signal-to-noise ratio of 64 dB and thus verifies the stability of the laser. The results indicate that the proposed Alq3 material is feasible for use as SA in realizing a reliably stable and flexible Q-switch laser for 1.5 μm operation.
关键词： fiber lasers,passive Q-switching,organic saturable absorber,organic material
更新于2025-09-11 14:15:04
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Anomalous passive Q-switching induced by Cr <sup>4+</sup> :YAG: with pulse repetition rate approaching up to 1 MHz
摘要： Anomalous passive Q-switching behavior was demonstrated in an Yb:KLu(WO4)2 laser, with a Cr4+:YAG crystal plate acting as saturable absorber whose initial transmission amounted to 99.3%. In stable Q-switched operation realized under high output coupling of 80%, 1.83 W of average output power was produced at a pulse repetition rate of 0.97 MHz, far beyond the upper limit imposed by the recovery time of the saturable absorber. The largest pulse energy, shortest pulse duration, and highest peak power were, respectively, 1.89 μJ, 39 ns, and 48.5 W. The high-repetition-rate passive Q-switching performance shows a close similarity to some Yb-ion lasers passively Q-switched by 2D saturable absorbers.
关键词： Cr4+:YAG,Yb lasers,passive Q-switching,Yb:KLuW crystal
更新于2025-09-04 15:30:14