Intra-pulse difference-frequency generation of mid-infrared (27–20  μm) by random quasi-phase-matching

Zhang, Jinwei; Fritsch, Kilian; Wang, Qing; Krausz, Ferenc; Mak, Ka Fai; Pronin, Oleg

doi:10.1364/ol.44.002986

Cited by 43 publications

(25 citation statements)

References 29 publications

(49 reference statements)

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“…RQPM is costless and independent to material orientation and input laser polarization, thus it possesses an extremely large bandwidth. During the past few years, RQPM nonlinear interactions driven by femtosecond lasers have received increasing attention to get broadband coherent mid-infrared (MIR) laser sources [2][3][4][5][6]. The RQPM efficiency can be comparable to traditional PM and QPM methods [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Fourier Transform Analysis on Random Quasi-Phase-Matched Nonlinear Optical Interactions

et al. 2022

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The Fourier transform method is adopted to analyze random quasi-phase matched (RQPM) nonlinear frequency conversion problems in polycrystalline materials. By treating the material as random signals of effective nonlinear coefficient (deff) along the beam path, fast Fourier transform (FFT) operations directly produce the generated field amplitude versus spatial frequency mismatch (Δk/2π), which relates to all the possible RQPM nonlinear interactions. Thus, the RQPM bandwidth is intuitive from the wavelength-dependent results. More importantly, the Fourier transform treatment greatly decreases the computational amount by orders compared with the traditional step-by-step integration method. The quantitative simulation of RQPM difference frequency generation (DFG) with three variable wavelengths is realized for the first time.

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Section: Introductionmentioning

confidence: 99%

“…During the past few years, RQPM nonlinear interactions driven by femtosecond lasers have received increasing attention to get broadband coherent mid-infrared (MIR) laser sources [2][3][4][5][6]. The RQPM efficiency can be comparable to traditional PM and QPM methods [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Fourier Transform Analysis on Random Quasi-Phase-Matched Nonlinear Optical Interactions

et al. 2022

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“…Random quasi-phase matching (RQPM) nonlinear optical frequency conversion that occurs in disordered polycrystalline nonlinear medium is under increasing attention, as it neither requires a specific material orientation nor depends on a certain polarization combination [1]- [6]. The most representative material is ZnSe, a cubic-symmetry semiconductor with broad transparency from visible to long-wave infrared (IR), high second-order nonlinearity and excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The optical parametric oscillator (OPO) based on polycrystalline ZnSe was achieved pumping by mode-locked Cr:ZnS laser pulses, generating broadband spectrum spanning 3-7.5 μm [2], [3]. Pumping with a Ho:YAG thin-disk femtosecond laser, ultra-broadband MIR continuum from 2.7 to 20 μm was also realized in polycrystalline ZnSe via intra-pulse difference frequency generation (DFG) [6]. Experimental results have shown that the RQPM efficiency can be comparable to traditional phase matching (PM) in birefringent crystals and QPM in periodically inverted crystals [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Grain Morphology on Nonlinear Conversion Efficiency of Random Quasi-Phase Matching in Polycrystalline Materials

Liu

Zhong

et al. 2020

IEEE Photonics J.

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Monte-Carlo simulations were performed on the efficiency of random quasi-phase matching (RQPM) nonlinear optical frequency conversion in polycrystalline materials to study the detailed effects of the statistical grain morphology. The second harmonic generation (SHG) process was taken for example based on random structures generated by a realistic grain growth model, and the effective nonlinear coefficient was rigorously derived by tensor transformation in randomly rotated coordinates. The effects of average grain size, standard deviation, and sphericity on SHG efficiency were figured out to conclude that the grain-size deviation plays the most important role in RQPM efficiency and the optimal grain size is smaller than the coherence length. The impacts of fundamental wavelength variation were also investigated. These results reveal how the RQPM process is affected by statistical and nonlinear optical laws, which enrich the RQPM theory and provide criteria for polycrystalline material processing in specific nonlinear applications.

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“…One particular type of DFG process known as intra-pulse DFG (IDFG) has shown promise as a relatively simple method for waveform-stable MIR generation. Such sources offer tens-of-mW level MIR output powers with a super-octave spectral coverage [28,29,[39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Multi-octave spanning, Watt-level ultrafast mid-infrared source

Butler

Lilienfein

et al. 2019

J. Phys. Photonics

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We present a source of brilliant mid-infrared radiation, seamlessly covering the wavelength range between 1.33 and 18 μm (7500-555 cm −1 ) with three channels, employing broadband nonlinear conversion processes driven by the output of a thulium-fiber laser system. The high-average-power femtosecond frontend delivers a 50 MHz train of 250 fs pulses spectrally centered at 1.96 μm. The three parallel channels employ soliton self-compression in a fused-silica fiber, supercontinuum generation in a ZBLAN fiber, and difference-frequency generation in GaSe driven by soliton selfcompressed pulses. The total output enables spectral coverage from 1.33 to 2.4 μm, from 2.4 to 5.2 μm, and from 5.2 to 18 μm with 4.5 W, 0.22 W and 0.5 W, respectively. This spatially coherent source with a footprint of less than 4 m 2 exceeds the brilliance of 3rd-generation synchrotrons by more than three orders of magnitude over 90% of the bandwidth.

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Intra-pulse difference-frequency generation of mid-infrared (27–20 μm) by random quasi-phase-matching

Cited by 43 publications

References 29 publications

Fourier Transform Analysis on Random Quasi-Phase-Matched Nonlinear Optical Interactions

Fourier Transform Analysis on Random Quasi-Phase-Matched Nonlinear Optical Interactions

Effects of Grain Morphology on Nonlinear Conversion Efficiency of Random Quasi-Phase Matching in Polycrystalline Materials

Multi-octave spanning, Watt-level ultrafast mid-infrared source

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