Single-Frequency Linearly-Polarized Short-Cavity Laser Based on the Er/Yb-codoped Phosphosilicate Fiber

The single-frequency linearly-polarized laser was implemented entirely in a segment of Er/Yb-codoped phosphosilicate single-mode fiber and Ge-doped polarization-maintain fiber. The slope efficiency was found to be ~9 %. The spectral linewidth of the laser did not exceed 170 kHz.