Infrared (2–12 μm) solid-state laser sources: a review

Godard, Antoine

doi:10.1016/j.crhy.2007.09.010

Cited by 400 publications

(160 citation statements)

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“…For them phase matching can be achieved, which enables their use in continuously tunable laser sources over wide infrared spectral ranges. [29][30][31][32] Detailed spectroscopic SHG studies of semiconductors at low temperatures, with high spectral resolution, and in applied magnetic field were initiated only in recent years. It was discovered that the application of a magnetic field to the noncentrosymmetric diamagnetic semiconductors GaAs and CdTe, for which SHG is allowed in ED approximation, induces new optical nonlinearities.…”

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confidence: 99%

Optical second harmonic generation in the centrosymmetric magnetic semiconductors EuTe and EuSe

et al. 2010

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The magnetic europium chalcogenide semiconductors EuTe and EuSe are investigated by the spectroscopy of second harmonic generation ͑SHG͒ in the vicinity of the optical band gap formed by transitions involving the 4f and 5d electronic orbitals of the magnetic Eu 2+ ions. In these materials with centrosymmetric crystal lattice the electric-dipole SHG process is symmetry forbidden so that no signal is observed in zero magnetic field. Signal appears, however, in applied magnetic field with the SHG intensity being proportional to the square of magnetization. The magnetic field and temperature dependencies of the induced SHG allow us to introduce a type of nonlinear optical susceptibility determined by the magnetic-dipole contribution in combination with a spontaneous or induced magnetization. The experimental results can be described qualitatively by a phenomenological model based on a symmetry analysis and are in good quantitative agreement with microscopic model calculations accounting for details of the electronic energy and spin structure.

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confidence: 99%

Optical second harmonic generation in the centrosymmetric magnetic semiconductors EuTe and EuSe

et al. 2010

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“…The near-and mid-infrared range covering the spectral band of 1-12 lm has been the one of the most explored research regions in laser technology in recent years [1]. The interest in this area results from the fact that the environment monitoring and national security engineering utilize radiation of this particular wavelength rangemainly due to an occurrence of spectral lines-characteristic for many chemical and biological compounds.…”

Section: Introductionmentioning

confidence: 99%

High repetition rate, Q-switched Ho:YAG laser resonantly pumped by a 20 W linearly polarized Tm: fiber laser

et al. 2013

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We describe an efficient, low-threshold, continuous-wave (CW) and Q-switched operation of a Ho:YAG laser resonantly, single-pass pumped by a 20 W linearly polarized narrow line width Tm: fiber laser at the wavelength of 1,908 nm. At room temperature for an output coupler of 30 % transmission, a maximum continuous-wave output power of 13.3 W for 18.9 W of absorbed pump power was achieved, corresponding to a slope efficiency of 73 %. In a quasi continuous-wave pumping regime, for several output couplers slope efficiencies of almost 82 % were observed. For a Q-switched operation, a Brewster-cut acousto-optic modulator was used. In a CW pumping regime, the pulse repetition frequency (PRF) was changed from 4 to 15 kHz. Under a Q-switched operation, the maximum output power of 12.25 W in relation to 15 kHz PRF was obtained; however, the maximum peak power of almost 250 kW at the PRF of 4 kHz was demonstrated. In the best case, for 4 kHz PRF, pulse energies of 2.18 mJ with a 8.8 ns FWHM pulse width (one of the shortest pulse durations observed in holmium-doped Q-switched lasers) were achieved. The laser operated at the wavelength of 2,090.23 nm with the FWHM line width of 0.95 nm. The beam quality factor of M 2 was measured to be below 1.42 in both X and Y axis.

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“…Research on mid infrared laser sources destined for long range detection is one of the most active areas of solid state photonics nowadays (see e.g. (Godard, 2007) (Mirov et al, 2007) etc.) (Schellhorn, et al, 2007) ).…”

Section: Introductionmentioning

confidence: 99%