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LD end-pumped single-ended bonding Tm:LuAG laser
摘要： A diode end-pumped Tm:LuAG laser at room temperature was reported. The thermal lens effect of Tm:LuAG crystal was analyzed, the distribution of the light field and thermal field in the crystal was simulated moreover. In this paper, by using plane-concave resonator, the continuous 2 μm laser output with maximum output power of 10.8 W is obtained. The slope efficiency is 19.56% and the optical-to-optical conversion efficiency is 25.71%. The beam quality factors M2 are 1.24 and 1.28 in the x and y directions respectively.
关键词： Single-ended bonding,Laser diode pumped,Tm:LuAG crystal,2 μm
更新于2025-09-16 10:30:52
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Frequency expansion of efficient passively Q-switched orthogonally-polarized dual-wavelength laser
摘要： We report on the frequency expansion of e?cient passively Q-switched (PQS) orthogonally-polarized dual-wavelength laser for the ?rst time, to our knowledge. The dynamic of pulse synchronization for the PQS dual-wavelength laser was analyzed theoretically. With two Nd:YLF crystals, the simultaneous PQS orthogonally-polarized dual-wavelength laser at 1047 and 1053 nm was obtained with the maximum output powers of 4.5 and 4.2 W, respectively, resulting in a total optical-to-optical conversion e?ciency of 18.7%. The timing jitter between the 1047 nm main pulse and 1053 nm main pulse was 26.6 ns. Furthermore, substituting one of the Nd:YLF crystals for a Nd:YAG crystal, two sets of simultaneous orthogonally-polarized dual-wavelength lasers at 1047, 1064 nm and 1053, 1064 nm were generated with near 6 W of output power.
关键词： Passively Q-switched,Dual-wavelength laser,Diode-pumped lasers
更新于2025-09-16 10:30:52
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[IEEE 2019 Photonics North (PN) - Quebec City, QC, Canada (2019.5.21-2019.5.23)] 2019 Photonics North (PN) - Diode-Pumped Dual-Wavelength Nd:GVO4 Laser
摘要： We report on the continuous-wave dual-wavelength laser operation of a Nd:GdVO4 laser using a single birefringent filter (BRF) plate. The laser operated at wavelength pair of 1063 & 1071 nm under in-band diode pumping of 912 nm. maximum total output power was ~ 2.5 W at ~13.4 W of absorbed pump power. Further rotation of the BRF could be used to adjust the power ratio between the two wavelengths or to achieve single wavelength operation [10,17].
关键词： diode-pumped,neodymium,solid-state laser
更新于2025-09-12 10:27:22
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Efficient continuous-wave Nd:YLF laser in-band diode-pumped at 908?nm and its thermal lensing
摘要： We report on what we believe is the first continuous-wave yttrium lithium fluoride laser with in-band diode pumping at 908 nm. Pumping at this wavelength reduced the quantum defect by more than 50% when compared to the conventional pumping at ~800 nm. The laser produced an output power of 850 mW at 1047 nm and its radiation was π-polarized. It had a near diffraction limited output beam and a maximum slope efficiency of ~73.9% with respect to the absorbed pump power. The thermal lensing strength was experimentally measured and compared with the previous experimental data. It was found that the thermal lensing was significantly reduced when compared to the traditional ~800 nm pumping.
关键词： neodymium,diode-pumped lasers,solid-state laser
更新于2025-09-12 10:27:22
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Femtosecond laser system based on thin rod Yb : YAG active elements with an output power of 110 W
摘要： A three-stage laser amplification system based on thin Yb : YAG rods with diode laser pumping is developed and fabricated. In this system, the average power of a continuous train of femtosecond pulses from a Yb : KGW master oscillator with a pulse repetition rate of 80 MHz and initial pulse duration of 128 fs was raised by a factor of 100 to above 100 W. Preliminarily chirped laser pulses provided compensation of dispersion in optical elements of the system and obtaining 580-fs output pulses. The longer duration of output pulses relates to spectrum narrowing in the amplifiers.
关键词： diode-pumped laser amplifier on Yb :YAG,high average radiation power,femtosecond pulses
更新于2025-09-12 10:27:22
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A passively Q-switching of diode-pumped 2.08-μm Ho:CaF2 laser
摘要： In this paper we demonstrate a continuous wave and passively Q-switched Ho:CaF2 laser pumped by a laser diode at 1.94 μm. In the continuous wave regime, the Ho:CaF2 laser produced 4.2 W output power at 2085.2 nm, corresponding to the slope efficiency of 48.4% with respect to the absorbed pump power. With Cr2+:ZnS saturable absorber, the maximum average output power of 3.6 W at 2084.1 nm, minimum pulse width of 92 ns and repletion rate of 5.88 kHz were achieved with a slope efficiency of 42.2%. Furthermore, the beam quality factors of passively Q-switched diode-pumped Ho:CaF2 laser were estimated to be about 1.3 in both vertical and horizontal directions.
关键词： Diode-pumped,Passive Q-switched,Ho:CaF2,Infrared lasers
更新于2025-09-12 10:27:22
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2?kHz single-frequency, injection-seeded Q-switched laser with a ‘double-reflection’ architecture
摘要： A high-repetition-rate single-frequency injection-seeded Q-switched Er:YAG laser with a ‘double reflection’ architecture is reported. Single-frequency laser pulses at a pulse repetition frequency (PRF) of 2 kHz are obtained by using ‘ramp-fire’ injection-seeding technique. The half-width of the pulse spectrum is measured to be 2.05 MHz by using the heterodyne beating technique. The novel ‘double-reflection’ architecture is employed in order to achieve a stable high-repetition-rate single-frequency operation. As far as we know, 2 kHz is the highest PRF achieved from a single-frequency, injection-seeded Q-switched Er:YAG laser that can be used in a wind Lidar system.
关键词： single-frequency lasers,eye-safe lasers,solid-state lasers,Q-switching,diode-pumped lasers,injection-seeding,Er:YAG lasers
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) - Comparison of Nd:YVO <sub/>4</sub> -Based Monolithic Microchip Laser Resonators for Single-Frequency Stable, CW Diode-Pumped Laser Sources
摘要： Single-frequency stable, narrow linewidth diode-pumped solid state (DPSS) lasers are commonly used in many applications and science areas, like high-resolution spectroscopy, optical metrology, gravity-wave detection, fundamental physics and others. Many of them require optical amplification of the DPSS seed laser to obtain higher output power while maintaining the excellent optical properties of the laser beam (e.g. Coherent Power Summation for military applications). In Ref.[2] the miniature, single-frequency stable DPSS laser operating at 1064 nm and patented structure of the monolithic microchip resonator Nd:YVO4/YVO4/YVO4 were described (Fig.1a). However, from commercial point of view the DPSS seed laser needs to be inexpensive, mechanically and optically stable for wide temperature range, easy to assemble and service. Here, the comparison of the 0.3 mm long a-cut Nd:YVO4 crystal resonator (Fig. 1b) with dielectric mirrors directly deposited onto the outer crystal surfaces (short resonator-SR) and described in Ref.[3] the 8.5mm long microchip resonator Nd:YVO4/YVO4/YVO4 (long resonator-LR) is presented for the first time. Both resonators were examined in the same DPSS laser module, providing the same conditions for their operation and they were pumped through a 3.5 mm long GRIN-lens collimator (Casix) by a linearly polarized 1W multimode 808 nm laser diode (QA-808-1000-030, Axcel Photonics). In comparison to the LR, the SR configuration provides only 27% less power conversion efficiency (at only 0.3mm resonator/gain crystal thickness) due to back reflection from HR@808nm coating of the pump beam. However, for the 808 nm pump power lower than 250 mW, the SR ensures slightly more output power than LR configuration due to 10-times lower power threshold (Fig. 1c). The pure single longitudinal mode operation was obtained for both configurations (Fig. 1e), nonetheless the SR provides almost 9-times wider temperature range (14-32°C @ 550mW of pump power) where laser resonator works in single mode (SM) regime (Fig. 1d), than the LR chip (21.2-23.2 °C @ 550mW of pump power). Additionally, the SR configuration does not need a crystals bonding process and it is around 25% cheaper (excluding bonding costs) compared to the LR. Whereas, the output beam divergence becomes around 4-times higher for the SR and it is more sensitive to angular aligning of the pump beam causing that transverse mode distribution can occur. Presented results and comparison were carried out within a commercial TANGO project “Development, optimization and integration of the single frequency seed laser operating at 1064 nm with medium power fiber amplifier”, (TANGO1/266345/NCBR/2015) financed by National Centre for Research and Development (NCBiR), Poland and statutory funds of the Faculty of Electronics (0401/0030/18).
关键词： single-frequency,optical amplification,diode-pumped solid state lasers,monolithic microchip laser,Nd:YVO4
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) - Tunable and Dual Wavelength Alexandrite Laser using the Crystal Birefringence
摘要： Red-diode-pumped Alexandrite lasers has proven to be an efficient method of generating light in the near infrared with broad tunability from 714 to 818 nm recently demonstrated [1]. Conventionally, tunable Alexandrite lasers have used wavelength selective elements such as birefringent filters or external gratings [1, 2]. In this work wavelength tuning is obtained by exploiting the birefringence of the crystal to use the crystal itself as the wavelength selective element, greatly simplifying the cavity and reducing innecessary loss components.
关键词： Alexandrite laser,red-diode-pumped,dual wavelength,tunable laser,birefringence
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) - Highly Efficient Laser Emission from a Novel Nd:LGSB Crystal
摘要： Infrared lasers at 1 μm are widely used in numerous industrial or medical applications, optical communication and spectroscopy. The lasers available nowadays are based on different laser active media, among which most common used are Nd:YAG, Yb:YAG, Nd:YVO4, or Nd:GdVO4, to mention few of them [1]. In addition, visible laser sources are obtained by using the infrared laser emission in conjunction with highly efficient nonlinear crystals. Furthermore, if the nonlinear crystal is doped with Nd3+ ions, then a compact, more efficient and lower-cost self-frequency conversion laser system could be realized. Thus, the research for finding new laser crystals or nonlinear crystals with prominent self-frequency doubling properties is of great interest in present, owing mostly to the need for up-scaling the existing laser systems. In this work we present our new findings with respect to Nd lasing at 1 μm, when it is inserted in LaGdSc(BO3)4 (LGSB) nonlinear matrix. The LGSB crystal doped with 5 at.% Nd3+ was grown by Czochralski pulling technique in our laboratory, the growth process being similar with that reported by Gheorghe et al. [2]. Worthy to be mentioned, the lasing in Czochralski-grown LGSB crystals was reported previously only for Yb trivalent ions [3]. First, the spectroscopic properties were determined for this laser medium. Thus, the negative uniaxial Nd:LGSB medium presents polarization selective absorption cross sections. Values of 5×10-20 cm2 (σ polarization) and 1.3×10-20 cm2 (π polarization) where measured for the absorption cross section at 807 nm. The determined emission cross sections were ~1.9×10-19 cm2 (π) and ~2×10-19 cm2 (σ). Laser experiments have been performed for two 5.0 at.% Nd:LGSB uncoated crystals: Nd:LGSB-1, length of 6.1 mm, c-cut and Nd:LGSB-2, 3.0-mm thickness, a-cut. The pump was done with a fiber-coupled diode laser (fiber with 100-μm diameter, NA= 0.22) in quasi-continuous wave (quasi-CW) mode (1-ms pump pulse at 10-Hz repetition rate), as well as in CW regime. A linear, 10-mm long plane-plane resonator was used in the experiments and various sizes of the pump-beam were considered. The laser pulse energy, Ep at 1062 nm yielded by Nd:LGSB-1 is shown in Fig. 1a) at a pump-beam diameter of 230 μm. Operation with high slope efficiency, ηsa= 0.67 was obtained; a maximum pulse energy Ep= 13.5 mJ was recorded for absorbed pump-pulse energy of 20.5 mJ (99% absorption efficiency, ηa). The power outputted from the same crystal, in CW operation, amounted to Pout= 1.3 W for Pabs= 2.1 W absorbed pump power; the slope efficiency was ηsa= 0.67 [Fig. 1b)]. The Nd:LGSB-2 crystal showed also a high ηsa= 0.63 slope; the CW power reached Pout= 0.75 W for Pabs= 1.6 W (absorption ηa= 0.74). Results on the polarization status, the laser beam transverse distribution and the influence of the pump-beam dimensions on the laser performances will be presented. These are the first results obtained from diode-pumped Nd:LGSB, showing very good performances at 1062 nm although uncoated laser crystals were employed in the present experiments.
关键词： Nd:LGSB crystal,spectroscopic properties,diode-pumped,Czochralski pulling technique,laser emission
更新于2025-09-12 10:27:22