Compact Fully Integrated Alignment-Free and Linearly Polarized Ho$^{3+}$ Single-Frequency Waveguide Laser

We report, for the first time, a fully integrated Ho$^{3+}$-doped fluoride glass waveguide laser incorporating a femtosecond laser-inscribed waveguide and waveguide Bragg grating. The compact 12.4 mm cavity achieves stable single-frequency lasing at 2062.21 nm with a line width of better than 5 MHz.