Spatial Frequency Manipulation of a Quartz Crystal for Phase‐Matched Second‐Harmonic Vacuum Ultraviolet Generation

Shao, Mingchuan; Liang, Fei; Zhang, Zhongmian; Yu, Haohai; Zhang, Huaijin

doi:10.1002/lpor.202300244

Cited by 6 publications

(1 citation statement)

References 41 publications

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“…The output wavelength covered 221 to 332 nm, and the conversion efficiency at the peak power was more than 1%. Very recently, they developed a metacrystal of quartz and increased the emission conversion efficiency at 177.3/167.8 nm to 0.23%, which is close to that with RBBF [88]. Yuan et al demonstrated a QPM structure inside a Type II waveguide in LiNbO 3 crystal (Figure 3g); the normalized conversion efficiency was enhanced to 8.76% W −1 cm −2 [89].…”

Section: χ (2) -Erasing Technique Using Femtosecond Lasermentioning

confidence: 73%

A Brief Review on Nonlinear Photonic Crystals Induced by Direct Femtosecond Laser Writing

Tian

Yan

et al. 2023

Photonics

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Direct femtosecond laser writing or inscription is a useful technique, and it has been employed to engineer various materials in many applications including nonlinear photonic crystals, which are of periodically patterned second-order nonlinearity to get and control the coherent light at new frequencies. By manipulation of second-order nonlinearity, either erased or poled, quasi-phase matching has been achieved in several crystals, especially three-dimensional nonlinear photonic crystals have been originally proposed and proved to be truly three-dimensional. Here we shortly review on the recent advances in the research field of nonlinear photonic crystals inscribed by femtosecond laser, as well as look into the future in this field.

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Section: χ (2) -Erasing Technique Using Femtosecond Lasermentioning

confidence: 73%

A Brief Review on Nonlinear Photonic Crystals Induced by Direct Femtosecond Laser Writing

Tian

Yan

et al. 2023

Photonics

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Cascaded Second Harmonic Generation for Deep‐UV Radiations with a 2D Nonlinear Photonic Quartz Crystal

Zhang,

Shao,

Liang

et al. 2024

Laser & Photonics Reviews

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Harmonic generation can broaden the laser wavelength in a great scope and is rich in physics, but the efficient cascaded second harmonic generation especially those directly deep into deep‐ultraviolet (DUV) with one single crystal seems to be impossible, due to the extremely strict phase‐matching conditions and relative narrow bandgap of present nonlinear optical crystals. Here, this work designs a nonlinear photonic quartz crystal where the phase difference of interacted light waves is manipulated in two dimensions and realizes an unprecedented cascaded phase‐matched 2nd–5th harmonic generation simultaneously with the photon energy up to 6 eV, representing the shortest wavelength by cascaded second harmonic generation in the solid‐state nonlinear medium. The generated light is located in the visible‐DUV region with a total conversion efficiency of 2.7%. The present nonlinear photonic quartz scheme not only provides a multi‐wavelength solid‐state laser source applied in modern devices but also develops a new route for studying the light‐matter nonlinear interaction in the DUV region.

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Giant enhancement of second harmonic generation via merging bound states in the continuum for vacuum ultraviolet radiation

Li,

Chang,

Guo

et al. 2024

Applied Physics Letters

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Vacuum ultraviolet (VUV) light plays a crucial role in various scientific and technological fields, such as nanolithography and biomedical treatments. However, the inherent nonlinear optical coefficient of nonlinear optical crystals is typically very low, and increasing the action length is often necessary to improve the nonlinear conversion efficiency. This makes it challenging for these materials to achieve high-density optoelectronic integration at the micro-/nano-scale. In this study, we propose a design for generating coherent VUV radiation close to 175 nm using second harmonic generation (SHG) with an absolute efficiency exceeding 1.2‰ mW−1. This is achieved by merging multiple bound state in the continuum modes in a free-standing photonic crystal slab. Even with fabrication imperfections at a level lower than 10% disorder, the SHG efficiency of the samples remains robust, maintaining an efficiency of at least 2‰. This research provides a beneficial platform for generating efficient VUV light in the nanoscale.

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Spatial Frequency Manipulation of a Quartz Crystal for Phase‐Matched Second‐Harmonic Vacuum Ultraviolet Generation

Cited by 6 publications

References 41 publications

A Brief Review on Nonlinear Photonic Crystals Induced by Direct Femtosecond Laser Writing

A Brief Review on Nonlinear Photonic Crystals Induced by Direct Femtosecond Laser Writing

Cascaded Second Harmonic Generation for Deep‐UV Radiations with a 2D Nonlinear Photonic Quartz Crystal

Giant enhancement of second harmonic generation via merging bound states in the continuum for vacuum ultraviolet radiation

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