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A gain-switched pulsed laser based on a commercial, heavily holmium-doped fluoroindate glass fiber, is designed to emit in the middle-infrared range, at the wavelength &#x03BB; = 3.92 &#x03BC;m. The laser, pumped at &#x03BB; = 888 nm, is modeled by a six-level system, by taking into account experimental spectroscopic parameters, to identify a feasible laser configuration. An output signal peak power of about Pspeak = 14.62 W with a full width at half maximum (FWHM) pulse duration less than &#x03C4;s = 73 ns and pulse energy Es = 1.214 &#x03BC; J is predicted, by considering an input peak power of Pppeak = 10 W, and pump repetition rate of f = 100 kHz, by employing a 8 cm-long fluoroindate fiber with holmium concentration NHo = 100 000 ppm. The obtained result encourages the construction of a pulsed laser based on commercially available optical fiber, for applications in different fields as sensing and biomedicine.

Numerical Design of a Gain-Switched Pulsed Laser at 3.92 μm Wavelength Based on a Ho3+-Doped Fluoroindate Fiber

Numerical Design of a Gain-Switched Pulsed Laser at 3.92 μm Wavelength Based on a Ho³⁺-Doped Fluoroindate Fiber