Non-stop sign achieved in high-power Erbium-doped mid-infrared lasers

The Mid-infrared lasers (MIR) with excessive peak energy and excessive repetition price working within the vary of two.7~3 μm have necessary utility in laser surgical procedure and optical parametric oscillator (OPO).

A current examine performed by Sun Dunlu’s analysis group on the Hefei Institutes of Physical Science (HFIPS) of the Chinese Academy of Sciences (CAS) achieved excessive energy, high efficiency and quasi-continuous mid-infrared laser within the free working and langasite [La₃Ga₅SiO₁₄ (LGS)] Q-switched modes by utilizing the Er³⁺ ions-doped YAP crystals as laser achieve medium.

Based on their earlier analysis work on laser, the researchers additional improved the laser efficiency of Er:YAP laser crystal by laser-diode (LD) side-pumping methodology, a Er:YAP crystal rod with concave end-faces was used to compensate the thermal lensing impact. The most output powers of 26.75 W have been achieved at 250 Hz, and 13.18 W at 1000 Hz, which is the very best working frequency in all of the LD side-pumped Er-doped MIR laser up to now.

In addition, they demonstrated a LD side-pumped and electro-optical Q-switched Er,Pr:YAP laser with emission at 2.7 μm. A large pulse laser was obtained with pulse vitality of 20.5 mJ, pulse width of 61.4 ns, and peak energy of 0.33 MW on the highest working frequency of 150 Hz.

These outcomes point out that the Er³⁺-doped YAP crystals are promising candidate for the high power and excessive frequency mid-infrared laser system, which possess nice potential for the appliance of dental ablation surgical procedure and OPO pump supply.