Far infrared generation by CO2 lasers frequencies subtraction in a ZnGeP2 crystal

Аполлонов, В. В.; Bocquet, Rachel; Boscheron, A.; Gribenyukov, A. I.; Korotkova, V.V.; Rouyer, C.; Suzdaltsev, A. G.; Shakir, Yu. A.

doi:10.1007/bf02068797

Cited by 6 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two different types of materials are presented in Table 1: the birefringent materials ZnGeP 2 and GaSe and the isotropic materials InSb and GaAs. Collinear phasematched THz DFG has been reported in ZnGeP 2 , which is a promising material in terms of nonlinearity and damage threshold, for both the CO 2 laser [2] and the Nd:YAG laser [3] pumped crystals. However, there are serious difficulties in growing large-aperture ZnGeP 2 crystals-a factor that limits the total power achievable in this crystal at 1 THz.…”

Section: A Optimal Nonlinear Materialsmentioning

confidence: 99%

“…The most successful techniques for generating narrowband, highpower THz pulses have come from frequency downconversion of the nanosecond 1 and 10 m lasers in nonlinear crystals. Tunable difference frequency generation (DFG) in the THz range was demonstrated both in birefringent, e.g., ZnGeP 2 [2,3], LiNbO 3 [4,5], and GaSe [6], and isotropic, e.g., GaAs [7] nonlinear materials. According to Manley-Rowe relations the maximum power conversion efficiency for DFG at a frequency of 3 = 1 − 2 (where 1 and 2 are input frequencies) is limited by the 3 / 1 ratio.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-power tunable, 05-3 THz radiation source based on nonlinear difference frequency mixing of CO_2 laser lines

et al. 2007

View full text Add to dashboard Cite

Terahertz (THz) pulses with a peak power of ϳ2 kW were generated in a noncollinear phase-matched GaAs crystal at room temperature. Two 200 ns pulses from a dual-beam TEA CO 2 laser were used for difference frequency mixing in the crystal. A comb of narrow lines ͑⌬ / ϳ 10 −4 ͒ was obtained in the 0.5-3 THz range with a step of 40 GHz. By comparing the effective nonlinearity of GaSe with that of GaAs for THz generation, the electro-optic nonlinear coefficient for GaSe was measured to be d eo = 24.3± 10% pm/ V. Using simulations we show that a 1 kW THz pulse could be amplified by a factor of 2 ϫ 10 4 to a 10 MW level in a 2 m long singlepass free-electron laser.

show abstract

Section: A Optimal Nonlinear Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-power tunable, 05-3 THz radiation source based on nonlinear difference frequency mixing of CO_2 laser lines

et al. 2007

View full text Add to dashboard Cite

show abstract

Generation of megawatt-power terahertz pulses by noncollinear difference-frequency mixing in GaAs

Tochitsky¹,

Ralph²,

Sung³

et al. 2005

Journal of Applied Physics

View full text Add to dashboard Cite

Terahertz pulses with a peak power of ϳ2 MW were generated in a noncollinear phase-matched GaAs crystal at room temperature. Efficient difference-frequency generation was achieved using 250-ps CO 2 laser pulses for which the surface damage threshold increased in comparison with standard 200-ns pulses. Tunable CO 2 lasers in combination with this technique should yield a source in the 0.1-3.0-THz range.

show abstract

Highly focused and efficient terahertz radiation generation by photo-mixing of lasers in plasma in the presence of magnetic field

Malik

Singh²,

Sajal

2014

Physics of Plasmas

View full text Add to dashboard Cite

A mechanism of efficient and highly focused terahertz (THz) radiation generation by photo-mixing of top-hat like lasers with frequencies ω1, ω2 and wave numbers k1, k2 in pre-formed rippled density (corrugated) plasma is proposed. In this mechanism, intensity variation of lasers offers nonlinear ponderomotive force at frequency ω′=ω1−ω2 and wave number k′=k1−k2 which couples with density ripples in the plasma and leads to a strong nonlinear oscillatory current that resonantly excites highly focused and intense THz radiation at frequency ωUH=(ωp2+ωc2) (where ωc is electron cyclotron frequency). The efficiency of emitted THz radiation of the order of 15% is obtained under optimum conditions. It is observed that focus and intensity of emitted radiation can be controlled by selecting a proper profile index of the lasers, ripple parameters, and tuning of external magnetic field.

show abstract

Far infrared generation by CO2 lasers frequencies subtraction in a ZnGeP2 crystal

Cited by 6 publications

References 2 publications

High-power tunable, 05-3 THz radiation source based on nonlinear difference frequency mixing of CO_2 laser lines

High-power tunable, 05-3 THz radiation source based on nonlinear difference frequency mixing of CO_2 laser lines

Generation of megawatt-power terahertz pulses by noncollinear difference-frequency mixing in GaAs

Highly focused and efficient terahertz radiation generation by photo-mixing of lasers in plasma in the presence of magnetic field

Contact Info

Product

Resources

About