Handedness control in a tunable midinfrared (60–125  μm) vortex laser

Horikawa, Michael-Tomoki; Ogawa, Azusa; Miyamoto, Katsuhiko; Yusufu, Taximaiti; Omatsu, Takashige

doi:10.1364/josab.32.002406

Cited by 22 publications

(13 citation statements)

References 34 publications

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“…is established, where ℓTHz, ℓOPA1, and ℓOPA2 are the topological charges of the THz, OPA1, and OPA2 outputs, according to the OAM conservation law [59]. It should be noted that the sign of the topological charge of the THz vortex is determined by the magnitude relation between the two pump wavelengths of the OPA1 and OPA2 outputs, as reported in our previous publications [59,60], i.e., for λ1 < λ2 (λ1 > λ2), the THz vortex mode exhibits a positive (negative) ℓTHz, as depicted in Fig. 2(a).…”

Section: Resultsmentioning

confidence: 99%

“…An alternative route to generate the THz vortex mode is to use optical vortex pumped difference frequency generation (DFG). We have successfully developed mid-infrared optical vortex sources based on 2 µm optical vortex laser [58]-pumped DFG with a moderate (millijoule level) pulse energy [58,59] and an extremely wide tunability over the entire mid-infrared region (6-18 µm) [60]. However, there is little discussion of the mode purity in an eigenmode of the vortex output generated from the DFG.…”

Section: Introductionmentioning

confidence: 99%

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Generation of high-quality terahertz OAM mode based on soft-aperture difference frequency generation

et al. 2019

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We demonstrate the generation of high-quality tunable terahertz (THz) vortices in an eigenmode by employing soft-aperture difference frequency generation of a vortex output and a Gaussian mode. The generated THz vortex output exhibits a high-quality orbital angular momentum (OAM) mode with a topological charge of ℓTHz = ±1 in a frequency range of 2-6 THz. The maximum average power of the THz vortex output obtained was ~3.3 µW at 4 THz.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generation of high-quality terahertz OAM mode based on soft-aperture difference frequency generation

et al. 2019

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“…OAM-tuning of VBs can be realized by gain-loss control 151 , off-axis pumping 92,152 , or the use of a spiral phase plate (SPP) 153 , a Q-plate 154,155 , or an SLM 144 . A wavelength-tunable VB can be achieved by designing special liquid crystal devices 156 , microcavities 157 , or on-chip gratings 158 or using nonlinear frequency conversion 159,160 . However, more methods to simultaneously realize wavelength and OAM tuning for novel applications, such as high-capacity optical communication using wavelength- and mode-division multiplexing, are still required.…”

Section: Progress In Vortex Generation Tuning and Manipulationmentioning

confidence: 99%

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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Thirty years ago, Coullet et al. proposed that a special optical field exists in laser cavities bearing some analogy with the superfluid vortex. Since then, optical vortices have been widely studied, inspired by the hydrodynamics sharing similar mathematics. Akin to a fluid vortex with a central flow singularity, an optical vortex beam has a phase singularity with a certain topological charge, giving rise to a hollow intensity distribution. Such a beam with helical phase fronts and orbital angular momentum reveals a subtle connection between macroscopic physical optics and microscopic quantum optics. These amazing properties provide a new understanding of a wide range of optical and physical phenomena, including twisting photons, spin–orbital interactions, Bose–Einstein condensates, etc., while the associated technologies for manipulating optical vortices have become increasingly tunable and flexible. Hitherto, owing to these salient properties and optical manipulation technologies, tunable vortex beams have engendered tremendous advanced applications such as optical tweezers, high-order quantum entanglement, and nonlinear optics. This article reviews the recent progress in tunable vortex technologies along with their advanced applications.

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“…For example, Lee et al demonstrated intra-cavity frequency doubling of a Raman laser to produce light at 586 nm, with the topological charge of the yellow beam being twice that of the Stokes beam [40]. Tunable output has been demonstrated across 6-12 µm in the far-infrared band [41] and in the mid-infrared at 2 µm [42] by frequency conversion of a 1 µm laser using an optical parametric oscillator configuration, and by second harmonic generation of a picosecond optical vortex output from a stressed Yb-doped fibre amplifier [43]. This remains a topical area of research.…”

Section: Oam Mode Generation (A) Scalar Modesmentioning

confidence: 99%

Controlling light’s helicity at the source: orbital angular momentum states from lasers

Forbes¹

2017

Phil. Trans. R. Soc. A.

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Optical modes that carry orbital angular momentum (OAM) are routinely produced external to the laser cavity and have found a variety of applications, thus increasing the demand for integrated solutions for their production. Yet such modes are notoriously difficult to produce from lasers due to the strict symmetry requirements for their creation, together with the need to break the degeneracy in helicity. Here, we review the progress made since 1992 in producing such twisted light modes directly at the source, from gas to solid-state lasers, bulk to integrated on-chip solutions, through to generic devices for on-demand OAM in both scalar and vector forms.This article is part of the themed issue 'Optical orbital angular momentum'.

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Handedness control in a tunable midinfrared (60–125 μm) vortex laser

Cited by 22 publications

References 34 publications

Generation of high-quality terahertz OAM mode based on soft-aperture difference frequency generation

Generation of high-quality terahertz OAM mode based on soft-aperture difference frequency generation

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Controlling light’s helicity at the source: orbital angular momentum states from lasers

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