Multiphonon-coupling yellow laser in Yb:La₂CaB₁₀O₁₉ crystal

Area of Science:

• Solid-state laser physics
• Materials science
• Nonlinear optics

Background:

• Traditional solid-state lasers struggle to produce yellow light (590 nm) due to inefficient transition channels.
• A significant spectral "yellow-gap" exists where practical solid-state lasers are unavailable.

Purpose of the Study:

• To propose and demonstrate a cooperative lasing mechanism for efficient yellow light generation.
• To overcome the limitations of traditional methods in achieving yellow solid-state lasers.
• To provide a high-power, compact, and cost-effective alternative for yellow laser applications.

Main Methods:

• Utilized a cooperative lasing mechanism involving multiphonon-assisted electronic transitions and phase-matched frequency-doubling.
• Employed a predictable configurational coordinate model to calculate multiphonon-assisted emission.
• Experimentally demonstrated the mechanism using Ytterbium (Yb³⁺)-doped Lanthanum Calcium Borate (La₂CaB₁₀O₁₉) crystal.

Main Results:

• Achieved yellow laser emission in the 581-590 nm range using the Yb³⁺-doped crystal.
• Obtained a maximum output power of 4.83 W with a high slope efficiency of 31.6%.
• Demonstrated the highest power for a solid-state yellow laser in a single crystal pumped by a laser diode to date.

Conclusions:

• The developed cooperative lasing mechanism effectively bridges the spectral "yellow-gap" in solid-state lasers.
• Power scaling is attributed to amplified phonon-assisted emission and optimized phase-matching conditions.
• The compact, low-cost, high-power yellow laser offers a viable alternative for applications requiring this specific wavelength.