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Vacuum ultraviolet second-harmonic generation in NH4B4O6F crystal.

Fangfang Zhang1,2, Zilong Chen1, Chen Cui1

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Researchers developed a new fluorooxoborate crystal, NH4B4O6F (ABF), for efficient vacuum ultraviolet (VUV) light generation. This crystal enables record 158.9-nm VUV light production via nonlinear optical methods, advancing spectroscopy and laser technology.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Solid State Chemistry

Background:

  • Vacuum ultraviolet (VUV) light sources (100-200 nm) are essential for spectroscopy, quantum research, and semiconductor lithography.
  • Second-harmonic generation (SHG) using nonlinear optical (NLO) crystals is the most efficient method for VUV generation.
  • Existing NLO crystals face limitations in phase-matching, efficiency, and crystal growth, hindering VUV production.

Purpose of the Study:

  • To develop a novel NLO crystal material for efficient VUV light generation.
  • To overcome the limitations of current NLO crystals in VUV applications.
  • To explore the potential of fluorooxoborate compounds for advanced optical applications.

Main Methods:

  • Synthesis and characterization of the fluorooxoborate crystal NH4B4O6F (ABF).
  • Fabrication of VUV devices utilizing ABF with specific phase-matching angles.
  • Experimental measurement of VUV light generation via phase-matching SHG.

Main Results:

  • Achieved a record VUV wavelength of 158.9 nm through phase-matching SHG using ABF.
  • Generated a maximum nanosecond pulse energy of 4.8 mJ at 177.3 nm.
  • Attained a VUV conversion efficiency of 5.9% attributed to the crystal's asymmetric sublattice structure.

Conclusions:

  • NH4B4O6F (ABF) is a highly promising NLO material for VUV generation.
  • The crystal's structure facilitates enhanced NLO performance, meeting phase-matching requirements.
  • ABF holds potential for developing compact, high-power VUV lasers.