Ultrabroad gain in an optical parametric generator with periodically poled KTiOPO4

Tiihonen, Mikael; Pasiskevicius, Valdas; Fragemann, Anna; Canalias, Carlota; Laurell, Fredrik

doi:10.1007/s00340-006-2253-7

Cited by 38 publications

(31 citation statements)

References 26 publications

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“…It is obtained using a pump wavelength of 860 nm, which is shorter than half the wavelength for zero-GVD (λ p = 910 nm), as expected from the Sellmeier equations [20]. An experimental shift of the OPG optimum towards shorter wavelengths is consistent with previous observations in other materials [12]. Furthermore, uncertainties in the Sellmeier equations also contribute to the discrepancy in λ p .…”

Section: Resultssupporting

confidence: 84%

“…An additional feature of the spectra obtained in PPMg:SLT is their remarkable flatness, in contrast to reported results for broadband OPG in PPKTP and PPLN, where significant dips in the signal and idler spectrum were carved out by cascaded up-conversion processes [12,13]. There is evidence of similar processes occurring also in our experiments, yet with a much lower efficiency and thus smaller impact on the flatness of the OPG spectra.…”

Section: Resultscontrasting

confidence: 77%

“…Moreover, pumping an OPG process exactly at half the zero-GVD wavelength might not necessarily correspond to the optimum for achieving the broadest bandwidths, because of the effect of higher order terms in the expansion of Eq. (2), as seen in PPKTP experiments [12]. Therefore in view of investigating broadband OPG in PPMg:SLT we set up to map a broader parameter range in the spectral region around the expected zero GVD point, using multiple poling periods, namely Λ = 25, 26 and 27 µm.…”

Section: Collinear Broadband Opg Conditionmentioning

confidence: 99%

“…Periodically poled KTP, LiNbO 3 and LiTaO 3 can offer alternative QPM solutions, enabling operation with pump wavelengths in the near infrared. 10 dB bandwidths of ~150 THz and ~100 THz have been demonstrated for OPG in PPKTP and PPLN, pumped at 830 and 930 nm, respectively [12,13]. Nevertheless, KTP conversion bandwidths are limited on the long-wavelength side by the absorption edge of the material (~3.5 μm).…”

Section: Introductionmentioning

confidence: 99%

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Ultra-broadband optical parametric generation in periodically poled stoichiometric LiTaO_3

Levenius¹,

Pasiskevicius²,

Laurell³

et al. 2011

Opt. Express

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Abstract:We report on broadband gain in an optical parametric generator based on periodically poled 1 mol% magnesium-doped stoichiometric LiTaO 3 (PPMg:SLT). More than an octave-spanning parametric gain, stretching from near to mid-infrared, is generated by pumping the crystals close to the point where, at parametric degeneracy, the waves experience zero group-velocity dispersion. Using a picosecond Ti:sapphire source, we measured the broadest parametric gain bandwidths, 180 THz at 10 dB, in PPMg:SLT gratings with a period of 25 µm pumped at 860 nm.

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Section: Resultssupporting

confidence: 84%

Section: Resultscontrasting

confidence: 77%

Section: Collinear Broadband Opg Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultra-broadband optical parametric generation in periodically poled stoichiometric LiTaO_3

Levenius¹,

Pasiskevicius²,

Laurell³

et al. 2011

Opt. Express

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“…1(b). This is the situation typically encountered in experiments [3][4][5][6].The unwanted effects of parasitic SFG processes on the parametric gain could in principle be alleviated through more sophisticated QPM grating designs, yet this option becomes ever more challenging as the OPG spectra get wider. Alternatively, instead of trying to remove the QPM resonances responsible for upconversion, one could exploit SFG cascading to reroute power into the OPG band by difference-frequency generation (DFG; cf.…”

mentioning

confidence: 99%

Multistep quadratic cascading in broadband optical parametric generation

et al. 2012

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We theoretically and experimentally investigate multistep parametric processes in broadband optical parametric generators (OPGs) based on periodically poled 1 mol. % MgO-doped stoichiometric LiTaO 3 . We demonstrate that parametric collateral processes may deplete or enhance spectral portions of the OPG output, depending on pump pulse duration. © 2012 Optical Society of America OCIS codes: 190.4410, 190.4360. A wide range of applications, encompassing ultrafast spectroscopy, high-harmonic and attosecond pulse generation, frequency combs, and remote sensing, spur current research on broadband optical sources in the in- The spectral flatness of the parametric gain curves is a feature almost as important as the breadth of their spectral coverage. However, multistep χ 2 processes triggered by broadband OPG, such as sum-frequency generation (SFG), often disrupt the flatness of gain profiles in QPM media [3][4][5][6].In this letter, we investigate theoretically and experimentally the impact of multistep χ 2 processes on broadband OPG in the pulsed regime. With reference to SFG, we show how quadratic cascading [7] can be used to engineer the OPG spectral profiles. Specifically, we demonstrate that the SFG-induced gain dips commonly observed in broadband OPG [3][4][5][6] can be turned into peaks by suitably choosing the pulse duration of the OPG pump. Experiments conducted in periodically poled MgO-doped stoichiometric LiTaO 3 (PPMgSLT) [6] provide evidence for theoretical predictions based on a model accounting rigorously for broadband OPG and multistep processes [8].The multistep quadratic interactions that can affect ultra-broadband parametric generation in a periodically poled medium are schematically illustrated by Fig. 1(a). In the χ 2 material, the optical pump at λ P excites parametric generation in the infrared region (λ OPG ) by means of first-order QPM processes. High-order resonances of the QPM grating can simultaneously enable SFG between the pump and specific components (λ S in Fig. 1) within the broadband OPG spectrum.The SFG process (1∕λ P 1∕λ S → 1∕λ SF ) subtracts energy from the OPG band, carving a gain dip at λ S as highlighted on the spectrum of Fig. 1(b). This is the situation typically encountered in experiments [3][4][5][6].The unwanted effects of parasitic SFG processes on the parametric gain could in principle be alleviated through more sophisticated QPM grating designs, yet this option becomes ever more challenging as the OPG spectra get wider. Alternatively, instead of trying to remove the QPM resonances responsible for upconversion, one could exploit SFG cascading to reroute power into the OPG band by difference-frequency generation (DFG; cf. Fig. 1(a)).In principle, according to the theory of quadratic cascading for nondegenerate frequency upconversion [9], the direction of energy flow in the SFG step is reversible (even at phase matching) as long as depletion of one of the waves (either λ S or λ P ) is locally achieved in the device. In our configuration ( Fig. 1(a)), the signal (λ S )...

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Femtosecond nonlinear frequency conversion based on BiB₃O₆

Petrov¹,

Ghotbi

Kokabee

et al. 2010

Laser & Photonics Reviews

112

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We review the physical properties, linear and nonlinear optical characteristics, and phase-matching configurations of BiB3O6 (BIBO), the first low-symmetry (monoclinic) inorganic nonlinear crystal that has found broad applications for frequency conversion of laser sources from the UV, across the visible, to the near-IR based on three-wave interactions. We describe in detail the most relevant optical properties that make this material an attractive candidate for nonlinear frequency conversion of laser light in general, and ultrafast femtosecond laser sources in particular. With special focus on ultrafast frequency conversion, characteristics such as group-velocity mismatch and spectral acceptance, parametric gain bandwidth, group-velocity dispersion, as well as angular acceptance and spatial walk-off are evaluated and optimum configurations for the attainment of maximum conversion efficiency, minimum pulse duration, and highest spatial beam quality are identified and compared with the most widely established alternative borate crystal, β-BaB2O4. Experimental results are presented on both parametric up-and down-conversion of femtosecond pulses, from the high-energy, low-repetition-rate (1 kHz) to the low-energy, high-repetitionrate (56-76 MHz) regime, demonstrating the unique versatility of BIBO for efficient frequency conversion of femtosecond pulses with broad tunability from 250 nm in the UV, throughout the visible, up to ∼ 3000 nm in the IR.Photograph of a femtosecond synchronously pumped optical parametric oscillator (SPOPO) based on BiB3O6 emitting in the yellow region of the spectrum. Pumped near 400 nm in the blue by the second harmonic of a Kerr-lens mode-locked Ti:sapphire laser, the SPOPO can generate femtosecond pulses across the full visible range of 480-710 nm, from the blue-green, through to yellow, orange and red.

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Ultrabroad gain in an optical parametric generator with periodically poled KTiOPO4

Cited by 38 publications

References 26 publications

Ultra-broadband optical parametric generation in periodically poled stoichiometric LiTaO_3

Ultra-broadband optical parametric generation in periodically poled stoichiometric LiTaO_3

Multistep quadratic cascading in broadband optical parametric generation

Femtosecond nonlinear frequency conversion based on BiB₃O₆

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Ultrabroad gain in an optical parametric generator with periodically poled KTiOPO4

Cited by 38 publications

References 26 publications

Ultra-broadband optical parametric generation in periodically poled stoichiometric LiTaO_3

Ultra-broadband optical parametric generation in periodically poled stoichiometric LiTaO_3

Multistep quadratic cascading in broadband optical parametric generation

Femtosecond nonlinear frequency conversion based on BiB3O6

Contact Info

Product

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Femtosecond nonlinear frequency conversion based on BiB₃O₆