Conical emission in β-barium borate under femtosecond pumping with phase matching angles away from second harmonic generation

Ali, Shahzad; Bisht, Prem B.; Nautiyal, A.; Shukla, V.; Bindra, K. S.; Oak, S. M.

doi:10.1364/josab.27.001751

Cited by 12 publications

(6 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Filamentation under the conditions of phasematched second-order nonlinear effects has led to SC generation, which is accompanied by simultaneous wavelength-tunable second harmonic or sum frequency generation, as experimentally observed in basic nonlinear crystals, such as KDP [229,230] and β-barium borate (β-BBO) [231,232].…”

Section: Birefringent Crystalsmentioning

confidence: 97%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

151

View full text Add to dashboard Cite

Nonlinear propagation of intense femtosecond laser pulses in bulk transparent media leads to a specific propagation regime, termed femtosecond filamentation, which in turn produces dramatic spectral broadening, or superbroadening, termed supercontinuum generation. Femtosecond supercontinuum generation in transparent solids represents a compact, efficient and alignment-insensitive technique for generation of coherent broadband radiation at various parts of the optical spectrum, which finds numerous applications in diverse fields of modern ultrafast science. During recent years, this research field has reached a high level of maturity, both in understanding of the underlying physics and in achievement of exciting practical results. In this paper we overview the state-of-the-art femtosecond supercontinuum generation in various transparent solid-state media, ranging from wide-bandgap dielectrics to semiconductor materials and in various parts of the optical spectrum, from the ultraviolet to the mid-infrared spectral range. A particular emphasis is given to the most recent experimental developments: multioctave supercontinuum generation with pumping in the mid-infrared spectral range, spectral control, power and energy scaling of broadband radiation and the development of simple, flexible and robust pulse compression techniques, which deliver few optical cycle pulses and which could be readily implemented in a variety of modern ultrafast laser systems.

show abstract

Section: Birefringent Crystalsmentioning

confidence: 97%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

151

View full text Add to dashboard Cite

show abstract

“…A similar treatment was given to the study of parametric down and up conversion [24,25]. For related experiments involving the process of parametric up conversion of the vacuum, see the work in [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

From Stochastic Optics to theWigner Formalism: The Role of the Vacuum Field in Optical Quantum Communication Experiments

Casado

Guerra

Plácido

2019

Atoms

View full text Add to dashboard Cite

TheWigner formalism in the Heisenberg picture constitutes a bridge that connects QuantumOptics to Stochastic Optics. The vacuum field appears explicitly in the formalism, and the wavelikeaspects of light are emphasised. In addition, the zeropoint intensity as a threshold for detection is acommon denominator in both theories. In this paper, after summarising the basic rules of the Wignerapproach and its application to parametric down-conversion, some new results are presented thatdelve into the physical meaning of the zeropoint field in optical quantum communication. Specifically,the relationship between Bell-state distinguishability and the number of sets of zeropoint modesthat take part in the experiment is analysed in terms of the coupling between the phases of thedifferent fields involved and the subtraction of the zeropoint intensity at the detectors. Additionally,the connection between the compatibility theorem in quantum cryptography and zeropoint fieldis stressed.

show abstract

“…Recently, the SPDC under a strongly focused pump has been studied, and a broadening effect of the far-field SPDC ring has been found, which is explained as a result of the transverse momentum spreading, making the phase-matching range extend beyond that for the initial focused pump beam [37,38]. In our experiment, the generated SPDC peak intensity is estimated to be on the order of 100 GW/cm 2 , exceeding the critical intensity for self-focusing in the BBO crystal or even approaching the minimum intensity required for WLSC generation [12]. It is thus expected that in our experiment, the intense femtosecond pulses are subject to self-focusing from optical Kerr nonlinearity [23].…”

Section: Resultsmentioning

confidence: 59%

“…Meanwhile, when intense light propagates in a transparent medium including quadratic nonlinear crystals, modulation instability usually occurs due to the interplay of optical Kerr nonlinearity and group velocity dispersion or diffraction, producing an exponential growth of perturbations during photon-medium interactions [10]. For example, away from phase-matching conditions of second-harmonic generation (SHG), BBO and KDP crystals could produce white-light supercontinuum (WLSC) in the center of the beam and colored conical emission (CCE) rings surrounding the white core [11,12]. Interestingly, when the phase-matching condition for SHG is satisfied, the spatiotemporally coupled modulation instability in a quadratic crystal can result in a series of bright cyan rings [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Broadband colored-crescent generation in a singleβ-barium-borate crystal by intense femtosecond pulses

et al. 2011

View full text Add to dashboard Cite

A visible colored crescent with a bandwidth broader than 220 nm is observed experimentally by loosely focused femtosecond pulses in a bulk quadratic nonlinear crystal (β-BBO crystal) at certain incident angles. Through the analysis based on a simple collinear phase-matching model, we suggest that the colored crescent might be the coexistence of spontaneous parametric down-conversions (SPDCs) in the infrared range and the corresponding efficient second-order harmonic generations (SHGs) that occur in a wide spectrum. We further provide a possible mechanism for the SHG process in which the phase-mismatching angles of the frequency doubling of SPDCs in β-BBO crystal are assumed to be compensated by the strong diffraction effect during the self-focusing process of the generated intense SPDC signals.

show abstract

Conical emission in β-barium borate under femtosecond pumping with phase matching angles away from second harmonic generation

Cited by 12 publications

References 34 publications

Ultrafast supercontinuum generation in bulk condensed media

Ultrafast supercontinuum generation in bulk condensed media

From Stochastic Optics to theWigner Formalism: The Role of the Vacuum Field in Optical Quantum Communication Experiments

Broadband colored-crescent generation in a singleβ-barium-borate crystal by intense femtosecond pulses

Contact Info

Product

Resources

About