1：Experimental Design and Method Selection:

The study employs a fiber-coupled laser diode at

2：91 μm as the pump source for a Ho:

SYSO laser, investigating both continuous-wave and Q-switched operations.

3：Sample Selection and Data Sources:

A Ho:SYSO crystal with a dopant concentration of

4：5 at.% and dimensions of 4×4×20 mm3 is used. List of Experimental Equipment and Materials:

Includes a fiber-coupled LD, lenses for beam collimation and focusing, a Ho:SYSO crystal, an acousto-optical Q-switch, and various mirrors and detectors.

5：Experimental Procedures and Operational Workflow:

The setup involves pumping the Ho:SYSO crystal, measuring output power and spectrum, and analyzing Q-switched performance at different pulse repetition frequencies.

6：Data Analysis Methods:

Output power, spectrum, pulse widths, energies, and peak powers are measured and analyzed using power meters, optical spectrum analyzers, and digital oscilloscopes.