Thulium Laser Enables Single-Frequency Oscillation in New Spectral Region
Sep 1, 2004 — Single-frequency fiber lasers have been developed in the 1.1-µm spectral region (based on ytterbium active ions) and in the 1.5-µm region (based on erbium active ions), but, recently, scientists in Denmark developed what they believe is the first single-frequency, distributed feedback fiber laser based on thulium active ions, lasing at 1.7 µm. They predict that the laser, which they expect to lase at 1.7 to 2.1 µm, will find applications in high-resolution spectroscopy, coherent lidar and...