Recent progress in selenite and tellurite based SHG materials

Area of Science:

• Materials Science
• Solid-State Chemistry
• Nonlinear Optics

Background:

• Metal selenites and tellurites exhibit excellent second-harmonic generation (SHG) properties.
• Significant progress has been made in developing these inorganic solid compounds over the last decade.
• Key properties include strong SHG efficiency, wide transparency, and appropriate birefringence.

Purpose of the Study:

• To review recent developments in selenite and tellurite-based SHG materials.
• To highlight advancements in SHG efficiency and UV absorption edges.
• To discuss challenges and future perspectives in the field.

Main Methods:

• Literature review of recent research on metal selenites and tellurites for SHG applications.
• Analysis of reported SHG efficiencies and optical properties.
• Examination of evolving chemical compositions and structural diversity.

Main Results:

• SHG efficiencies up to 13.5 × KDP (BiFSeO3) for selenites and 2 × KTP (CdTeMoO6) for tellurites have been achieved.
• The UV absorption edge for tellurites has been extended to 205 nm (BaF2TeF2(OH)2).
• Research has expanded beyond d0 transition metals, incorporating fluorine to enhance optical bandgaps and structural types.

Conclusions:

• Recent progress has significantly advanced the field of selenite and tellurite SHG materials.
• Incorporation of fluorine and exploration of diverse metal elements are key trends.
• Further research is needed to overcome challenges and discover new high-performance SHG materials.