Gain-Switched Ho:YAP Laser with a 6.7 ns Pulse Duration at 2117 nm

This study demonstrates, for the first time, an innovative gain-switched Ho:YAP laser designed for laser distance measurement and remote sensing applications. The laser operates at a wavelength of 2117 nm, well positioned within the short-wavelength infrared (SWIR) atmospheric transmission window of between 2.1 and 2.5 µm. The laser delivers short pulse durations of 6.7 ns, and pulse energies of 0.645 mJ, allowing for an enhanced range and improved resolution. The Ho:YAP laser is pumped by a passively Q-switched Tm:YLF laser, resulting in a compact and energy-efficient system suitable for various sensing applications in precise distance measurement and environmental gas detection.