Single-Frequency Dy:ZBLAN Fiber Laser Tunable in the Wavelength Range From 2.925 to 3.250 μm

We report on an in-hand-pumped Dy-doped ZBLAN fiber laser with tunable emission wavelength in the mid-IR range from 2.925 to 3.250 mu m and single-frequency operation. Using the combination of an intracavity germanium etalon and a reflective diffraction grating, we demonstrate the selection of single-frequency operation with emission linewidth narrower than 110 kHz, maximum output power of similar to 40 mW, and relative intensity fluctuations at a level of 0.9% over an integration bandwidth from 1 Hz to 10 MHz.

Automated summary

We present a handheld Dy-doped ZBLAN fiber laser that can be pumped by hand, with tunable emission wavelength in the mid-IR range and capable of single-frequency operation. By utilizing an intracavity germanium etalon and a reflective diffraction grating, we achieved single-frequency operation with emission linewidth narrower than 110 kHz and relative intensity fluctuations at a level of 0.9% over a wide integration bandwidth.