Thermal-induced refractive-index planar waveguide laser

Kang, Hongxiang; Zhang, Haitao; Wang, Dongsheng

doi:10.1063/1.3258068

Cited by 14 publications

(1 citation statement)

References 15 publications

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“…Laser physics predicts that multi-ten-kilowatt power is expectable from a single mode large mode area (LMA) ytterbiumdoped fiber (YDF) by considering the physical limitations such as the pump brightness, thermal lensing and nonlinearities [1][2][3]. However, technical limitation such as the splicing treatment, especially the leaked cladding light into the polymer coating, is also a huge challenge for high power fiber laser.…”

Section: Introductionmentioning

confidence: 99%

Power scaling analysis of high power fiber laser employing online three-section recoating method of splice point

et al. 2016

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Thermal damage is a major limiting factor in the experimental power scaling of high power fiber lasers. A novel online three-section recoating method is proposed in this work which can remove the leaked light due to interface imperfection and improve the heat transfer of the splicing. More than 5.4 kW pump power is injected into the gain fiber through the splice point without damage. Theoretical analysis is carried out with both of the analytical and finite element models. The theoretical results agree in temperature growth slope with the experimental results and the extrapolation implies that it is possible to inject more than 10 kW pump power into the 30/600 YDF from the single end using this method.

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Section: Introductionmentioning

confidence: 99%

Power scaling analysis of high power fiber laser employing online three-section recoating method of splice point

et al. 2016

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Performance of continuous-wave laser-diode side-pumped Er:YSGG slab lasers at 2.79 μm

et al. 2015

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at the 3-µm transition are attractive for use as pump sources for tunable mid-IR generation using optical parametric oscillation (OPO) or optical parametric generation (OPG) laser systems [4,5], which have broad applications in spectroscopy and atmospheric detection [6]. A simplified Er 3+ energy level diagram is shown in Fig. 1. The 4 I 11/2 upper laser state is directly pumped with a 970-nm laser-diode, and the laser output at 2.79 µm from Er 3+ -doped lasers is because of a transition between the 4 I 11/2 and the 4 I 13/2 energy levels [7]. According to classical laser theory, continuous-wave (CW) operation of the Er 3+ -doped laser is impossible because the upper lasing level has a shorter lifetime than the lower one [8]. However, because of the complex energy transfer processes inherent in these systems and the splitting of the laser levels into manifolds of Stark sub-levels, efficient CW operation for the Er 3+ -doped laser at 2.79 µm was achieved [9].The Er:Y 3 Sc 2 Ga 3 O 12 (Er:YSGG) crystal was demonstrated to be an excellent laser material for a diode-pumped laser at 2.79 µm because of its lower laser threshold and higher laser efficiency compared with other Er 3+ -doped garnet crystals, such as Er:YAG and Er:GGG crystals [10]. Dinerman et al. [9] reported a CW laser output with a power of 511 mW at 2.79 µm from a laser-diode-pumped Er:YSGG crystal. Waarts et al. [11] obtained a 900-mW CW laser output at 2.8 µm using a laser-diode array to pump the Er:YSGG microlaser arrays. Jensen et al. [12] reported a free-running laser with pulse energy of 40 mJ at 20 Hz from a quasi-continuous-wave (QCW) diode end-pumped monolithic Er:YSGG crystal. Arbabzadah et al. obtained a free-running pulse energy of up to 55 mJ at 14 Hz with a QCW diode pumping the Er:YSGG crystal [13]. Recently, we obtained a CW laser output at 2.79 µm with a power of 900 mW from a laser-diode end-pumped composite YSGG/ Er:YSGG crystal [14]. However, because of the thermal Abstract The performance of a laser-diode side-pumped Er:YSGG slab at a wavelength of 2.79 µm was investigated experimentally, and the laser output mode was analyzed using the theory of a thermally induced refractive index planar waveguide. Experimentally, a maximum continuouswave output of 1.84 W with a slope efficiency of 11.2 %, and an optical-to-optical efficiency of 7.5 % at 2.79 µm was obtained with a 970-nm laser-diode dual-side-pumped Er:YSGG slab. To the best of our knowledge, the output power was the highest reported for a laser-diode-pumped Er:YSGG laser with a continuous-wave output at 2.79 µm. The numerical analysis showed that the output power was mainly limited by thermal effects in the thickness direction and the laser output transverse mode in the experiment was the fundamental mode in this direction.

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A simple method for the refractive index and dispersion measurements of transparent materials by transmissivity

Sun

Xia

2017

Optik

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Thermal-induced refractive-index planar waveguide laser

Abstract: Solid state organic laser emission at 970 nm from dye-doped fluorinated-polyimide planar waveguides Appl. Phys. Lett. 93, 023306 (2008); 10.1063/1.2959729 Rare-earth doped polymers for planar optical amplifiers

Cited by 14 publications

References 15 publications

Power scaling analysis of high power fiber laser employing online three-section recoating method of splice point

Power scaling analysis of high power fiber laser employing online three-section recoating method of splice point

Performance of continuous-wave laser-diode side-pumped Er:YSGG slab lasers at 2.79 μm

A simple method for the refractive index and dispersion measurements of transparent materials by transmissivity

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