Frequency doubling of phase-modulated femtosecond laser pulses in periodically poled and chirped nonlinear crystals

Yusupov, D. B.; Chirkin, A. S.

doi:10.3103/s1541308x07040048

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The fundamental wave (FW) was weakly focused with a spot radius of approximately 200 mm and was coupled into the polished end of the sample. The peak value of the FW pump power was at the modest level of 0.1 GW cm 22 . Then suitable filters were used to separate the fundamental wave and the harmonics, and a power meter was used to record the pulse power, from which the conversion efficiency was calculated.…”

Section: Measurement Of the Nonlinear Conversion Efficiencymentioning

confidence: 96%

“…3 For example, a QPM structure with a linearly varying wave vector along the direction of wave propagation can be used to achieve effective nonlinear pulse compression 18,19 and to implement various frequency-conversion processes. [20][21][22][23] In this work, we achieve a considerable advancement in this technology through the design and fabrication of chirped periodically poled lithium niobate (CPPLN) nonlinear crystals whose modulation period of nonlinear susceptibility varies along the propagation direction. We demonstrate both theoretically and experimentally that CPPLN can support multiple orders of QPM with finite bandwidth and therefore, allows for simultaneous broadband SHG and THG with high conversion efficiency from a single crystal.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous broadband generation of second and third harmonics from chirped nonlinear photonic crystals

et al. 2014

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Ultrabroadband laser sources are highly desirable in a wide variety of modern science disciplines ranging from physics, chemistry and materials science to information communications and processing. Here we present the design and fabrication of a chirped periodically poled lithium niobate (CPPLN) nonlinear photonic crystal that supports multiple orders of quasiphase matching with finite bandwidth and allows for the simultaneous broadband generation of second and third harmonics with high conversion efficiency. Moreover, the chirp rate has a significant influence on the conversion efficiency and bandwidth. The CPPLN scheme offers a promising approach for the construction of short-wavelength laser sources and enables the generation of the three primary colors-red, green and blue-from a single crystal, which may have potential applications in large-screen laser displays. Keywords: chirped periodically poled lithium niobate; quasiphase matching; second-harmonic generation; third-harmonic generation INTRODUCTION Ultrabroadband laser sources are highly desirable in a wide variety of modern science disciplines ranging from physics, chemistry and materials science to information communications and processing. Laser gain media that are capable of short-pulse generation are available but limited, and they cover only a small portion of the optical spectrum. Shortly after the creation of the first laser in 1960, the door to nonlinear optics was opened because of the discovery of second-harmonic generation (SHG).1 Broad-bandwidth and high-conversion-efficiency SHG, third-harmonic generation (THG), higher-order-harmonic generation and various frequency-mixing and parametric-conversion processes have all provided fascinating routes toward the considerable expansion of the spectral range of laser sources.To realize high-efficiency SHG, THG and other optical parametric processes, nonlinear optical materials are required to simultaneously satisfy the phase-matching condition and possess large nonlinear optical coefficients in the phase-matching direction. Although many natural nonlinear crystals have large nonlinear coefficients in certain directions, proper phase matching cannot always be achieved because of the dispersion of the material. Thus, the optical birefringent properties of certain birefringent nonlinear crystals are often utilized to compensate for the material dispersion and achieve phase matching. However, the stringent conditions for birefringent phase matching greatly limit the extension of the optical frequency. As an alternative approach, quasiphase matching (QPM), which was first proposed in 1962, 2 launched a new era in nonlinear optics because of several advantages it offers over conventional birefringence phase matching in the frequency-conversion process. These advantages include phase matching in materials that have high nonlinear optical coefficients but

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Section: Measurement Of the Nonlinear Conversion Efficiencymentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Simultaneous broadband generation of second and third harmonics from chirped nonlinear photonic crystals

et al. 2014

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“…According to previous studies, the origin of this trade-off lies in the group-velocity mismatch and group-velocity dispersion [48]. In order to circumvent this trade-off, the aperiodic QPM structures whose RLV spectral response is broader than periodic ones have been proposed as a solution [49][50][51][52][53].…”

Section: Cppln For Broadband Shg and Thgmentioning

confidence: 99%

Engineering quadratic nonlinear photonic crystals for frequency conversion of lasers

Chen

Hong

et al. 2018

J. Opt.

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Nonlinear frequency conversion offers an effective way to extend the laser wavelength range. Quadratic nonlinear photonic crystals (NPCs) are artificial materials composed of domain-inversion structures whose sign of nonlinear coefficients are modulated with desire to implement quasi-phase matching (QPM) required for nonlinear frequency conversion. These structures can offer various reciprocal lattice vectors (RLVs) to compensate the phase-mismatching during the quadratic nonlinear optical processes, including second-harmonic generation (SHG), sum-frequency generation and the cascaded third-harmonic generation (THG). The modulation pattern of the nonlinear coefficients is flexible, which can be one-dimensional or two-dimensional (2D), be periodic, quasi-periodic, aperiodic, chirped, or super-periodic. As a result, these NPCs offer very flexible QPM scheme to satisfy various nonlinear optics and laser frequency conversion problems via design of the modulation patterns and RLV spectra. In particular, we introduce the electric poling technique for fabricating QPM structures, a simple effective nonlinear coefficient model for efficiently and precisely evaluating the performance of QPM structures, the concept of super-QPM and super-periodically poled lithium niobate for finely tuning nonlinear optical interactions, the design of 2D ellipse QPM NPC structures enabling continuous tunability of SHG in a broad bandwidth by simply changing the transport direction of pump light, and chirped QPM structures that exhibit broadband RLVs and allow for simultaneous radiation of broadband SHG, THG, HHG and thus coherent white laser from a single crystal. All these technical, theoretical, and physical studies on QPM NPCs can help to gain a deeper insight on the mechanisms, approaches, and routes for flexibly controlling the interaction of lasers with various QPM NPCs for high-efficiency frequency conversion and creation of novel lasers.

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Multistep third-harmonic generation of femtosecond laser pulses in periodically-poled and chirped-periodically-poled lithium niobate

Yusupov

Sapaev

2009

J Russ Laser Res

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Frequency doubling of phase-modulated femtosecond laser pulses in periodically poled and chirped nonlinear crystals

Cited by 6 publications

References 5 publications

Simultaneous broadband generation of second and third harmonics from chirped nonlinear photonic crystals

Simultaneous broadband generation of second and third harmonics from chirped nonlinear photonic crystals

Engineering quadratic nonlinear photonic crystals for frequency conversion of lasers

Multistep third-harmonic generation of femtosecond laser pulses in periodically-poled and chirped-periodically-poled lithium niobate

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