Augmented spectrum bandwidth of Nd-doped garnet and bixbyite by spectrum tailoring

Area of Science:

• Materials Science
• Optics and Photonics
• Solid-State Physics

Background:

• Neodymium-doped (Nd) garnet and bixbyite are established solid-state laser gain media.
• A narrow emission bandwidth in these materials limits ultrafast pulse generation capabilities.

Purpose of the Study:

• To estimate the designable spectral bandwidth of Nd-doped garnet and bixbyite through spectral tailoring.
• To explore methods for enhancing emission bandwidth for improved ultrafast laser applications.

Main Methods:

• Evaluation of fluorescent spectra from Nd³⁺ in various ordered and disordered host ceramics, including YₓLu₂₋ₓO₃, YₓGd₂₋ₓO₃, LuₓGd₂₋ₓO₃, Y₃AlₓSc₅₋ₓO₁₂, Y₃AlₓGa₅₋ₓO₁₂, YₓLu₃₋ₓAl₅O₁₂, YₓGd₃₋ₓAl₅O₁₂, and LuₓGd₃₋ₓAl₅O₁₂.
• Spectral tailoring and temperature tuning of stacked composite Nd-doped garnet crystals.

Main Results:

• A 6-nm spectral bandwidth was determined to be achievable using a stacked composite of at least four Nd-doped garnet crystals.
• Temperature tuning of the stacked composite demonstrated improved designability and augmented emission bandwidth.
• A 6-nm emission bandwidth was successfully demonstrated with a specific stacked composite.

Conclusions:

• Spectral tailoring of Nd-doped garnets offers a viable route to broaden emission bandwidth.
• Stacked composites of multiple Nd-doped garnet crystals, combined with temperature tuning, can significantly enhance laser performance for ultrafast applications.