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Efficient Continuous-Wave Diode-Pumped Ho :GTO Laser with a Pump Recycling Scheme
摘要： We demonstrate a novel continuous-wave 2.1 μm Ho : GTO laser pumped by a laser diode. Employing a pump recycling scheme and 30% output transmittance, we obtain an output power of 4.76 W and a single oscillating peak of 2068.4 nm with a slope e?ciency of 55.3% with respect to the absorbed pump power. In addition, the M2 factor of the Ho : GTO laser is reckoned to be approximately 1.3 at the maximum output power.
关键词： infrared laser,diode-pumped laser,Ho : GTO
更新于2025-09-23 15:19:57
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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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[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) - Tm <sup>3+</sup> :LuF <sub/>3</sub> -CaF <sub/>2</sub> Diode Pumped Laser in 1.9 μm Region
摘要： The thulium (Tm3+) doped solid state lasers, operating on the transition 3F4→3H6 are source of broadly tunable “eye-safe” laser radiation in 1.8 to 2.0 μm region where are located important absorption bands of H2O, CO2. This spectral region is interesting for application such as coherent radar systems, atmospheric remote sensing, high-resolution spectroscopy, and medical surgery. This high possibility of applications stimulates research on thulium solid state lasers and search for new host materials [1-3]. The new investigated Tm:LuF3-CaF2 mixed fluoride crystal was grown in A. M. Prokhorov General Physics institute by the Bridgmann-Stockbauer technique in fluorinating atmosphere. The composition of the melt was (TmF3)1 (CaF2)97 (LuF3)2 resulting in 1 mol % doping concentration of Tm3+ active ions. The sample was cut from the grown crystal in the form of 7.1 mm thick block with plan-parallel polished faces without any anti-reflection coating. The absorption spectrum was obtained using a spectrophotometer (Shimadzu UV-3600 UV-VIS-NIR sampling interval 0.05 nm). For laser performance measurement the 142 mm long, semi-hemispherical resonator was used. The resonator consisted of a flat pumping mirror PM (reflectivity R > 99.9 % @ 1890 nm, and transmittance T = 95 % @ 763 nm) and curved output coupler OC (r = -150 mm). Three output couplers with reflectivity 97.5 %, 94.5 % and 92.0 % were tested. The Tm:LuF3-CaF2 crystal was mounted in water cooled (18°C) copper holder. For longitudinal pumping a fiber (core diameter 400 μm, NA = 0.22) coupled laser diode M1F4S22-765.3-30C-SS2.1 (DILAS) was used. The diode operated in pulse regime (10 ms pulse width, repetition rate f = 10 Hz) at wavelength λp = 763 nm (highest possible wavelength of the diode). Laser emission wavelength λe was measured with spectrometer StellarNet Red-Wave (sampling interval 1.4 nm). The absorption spectrum of Tm:LuF3-CaF2 crystal in pumping and lasing region is in Fig. 1a. The maximum absorption coefficient in pumping region 0.78 cm-1 was reached at 768 nm with linewidth 23.5 nm (FWHM) which is suitable for diode pumping. From 785 to 800 nm the absorption curve has a plateau with value 0.27 cm-1. In lasing region, the absorption coefficient has two maxima of 0.84 and 0.51 cm-1 at 1610 and 1667 nm respectively. The absorption spectrum in lasing region is smooth and broad and thus suitable for emission tuning and for short pulse generation. Measured laser performance with respect to absorbed pumped energy is shown in Fig. 1b. The slope efficiency σ and laser threshold Eth were calculated using linear fit. Maximum output energy of 4.2 mJ with slope efficiency σ = 30.3 % and laser threshold Eth = 12.5 mJ was achieved with 97.5 % OC. The wavelength of output radiation was 1887 nm. From the results follows that the new mixed Tm:LuF3-CaF2 crystal is suitable material for laser action with good efficiency. Further investigation needs to be done on material and spectroscopic properties to determine its laser performance in comparison with other thulium doped laser hosts.
关键词： diode pumped laser,1.9 μm region,thulium doped solid state lasers,Tm3+:LuF3-CaF2
更新于2025-09-12 10:27:22
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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 continuous-wave Yb:YAP laser
摘要： High power continuous-wave operation of a diode-pumped Yb:YAP laser was demonstrated. The laser generated >7 W of output power with 22 W of pump power with the slope efficiency of around 70% while maintaining high beam quality. The combination of high thermal conductivity and broad gain bandwidth makes this laser host an attractive candidate for high power CW and ultrashort pulse generation.
关键词： diode-pumped laser,Yb-doped laser crystals,solid-state laser
更新于2025-09-11 14:15:04
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Passively Q-switched laser using PtSe2 as saturable absorber at 1.3 μm
摘要： We report a passively Q-switched Nd:YVO4 laser at 1341.5 nm by using few-layer Platinum diselenide (PtSe2) as the saturable absorber (SA). The nonlinear saturable absorption properties of the PtSe2 at 1.3 μm were measured, showing a modulation depth of 7% and a saturation intensity of 25 GW/cm2, respectively. The maximum Q-switched pulse average power was 209 mW under the absorbed pump power of 3.62 W. The shortest pulse duration and the highest pulse repetition rate was 775 ns and 103.5 kHz, respectively. The instability (output powers, rms) of the Q-switched pulse was measured to be about 0.63% for one hour. The results indicated that the PtSe2 have a good performance as a potential SA in the 1.3 μm spectral range.
关键词： PtSe2,passively Q-switched,diode-pumped laser,1.3 μm
更新于2025-09-11 14:15:04