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Related Experiment Video

Updated: Jun 30, 2026

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
07:42

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Breakthrough in High Quality LaBGeO5 Crystal for Deep Ultraviolet Quasi-Phase Matching Application.

Jiahao Wang1,2, Lingfei Lv1, Rongbing Su1

  • 1State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.

ACS Applied Materials & Interfaces
|June 29, 2026
PubMed
Summary
This summary is machine-generated.

New LaBGeO5 (LBGO) crystals offer a promising alternative for deep ultraviolet (UV) laser applications. LBGO crystals exhibit excellent properties for UV quasi-phase matching (QPM) devices, overcoming limitations of current materials.

Keywords:
LaBGeO5deep ultravioletferroelectric crystalnonlinear optical crystalquasi-phase matching

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Solid State Physics

Background:

  • Deep ultraviolet (UV) lasers are crucial for advanced technologies.
  • Current materials like beta-barium borate (β-BBO) and cesium lithium strontium borate (CLBO) have limitations such as hygroscopicity and walk-off effects.
  • There is a need for novel materials for efficient UV frequency conversion.

Purpose of the Study:

  • To explore LaBGeO5 (LBGO) crystals as a potential material for UV quasi-phase matching (QPM) devices.
  • To investigate the properties of synthesized LBGO crystals for nonlinear optical applications.
  • To assess LBGO's suitability for overcoming the limitations of existing UV nonlinear optical materials.

Main Methods:

  • Synthesis of LaBGeO5 crystals with well-developed facets.
  • Characterization of optical properties, including absorption edge and transmittance.
  • Measurement of second-harmonic generation (SHG) intensity and laser-induced damage threshold (LIDT).
  • Investigation of the ferroelectric domain-switching mechanism.

Main Results:

  • LBGO crystals were successfully synthesized with well-developed facets.
  • Observed an absorption edge at 195 nm and 78% transmittance at 266 nm.
  • Achieved a second-harmonic generation intensity of 1.5 times that of KDP.
  • Recorded a laser-induced damage threshold of approximately 2.4 GW/cm² (@1064 nm, 10 ns, 10 Hz).
  • Identified domain-switching ability attributed to distorted [BO4] tetrahedrons within [GeB2O9] rings.

Conclusions:

  • LaBGeO5 (LBGO) is a promising ferroelectric material for UV quasi-phase matching (QPM) applications.
  • LBGO demonstrates superior properties compared to existing materials, addressing limitations like hygroscopicity and walk-off effects.
  • The unique structural characteristics of LBGO contribute to its excellent nonlinear optical performance, paving the way for advancements in UV laser technology.