Single-frequency fiber oscillator with watt-level output power using photonic crystal phosphate glass fiber

Abstract

Utilizing phosphate glass fiber with photonic crystal cladding and highly doped, large area core a cladding-pumped, single-frequency fiber oscillator is demonstrated. The fiber oscillator contains only 3.8 cm of active fiber in a linear cavity and operates in the 1.5 micron region. Spectrally broad, multimode pump light from semiconductor laser diodes is converted into a single-mode, single-frequency light beam with an efficiency of about 12% and the oscillator output power reached 2.3 W.

High-Power ZBLAN Glass Fiber Lasers: Review and Prospect

“…Phosphate glass as the host for the fiber lasers has a high solubility that enables extremely high doping level of rare-earth ions (up to 20 wt%) and now is mostly used for high-gain fibers. Very high-gain per unit fiber length (∼5 dB/cm) can be obtained and watt-level outputs have been delivered from short-length (<10 cm) fiber cavities that support oscillation with single longitude mode [6,7]. Fluoride and chalcogenide glasses have drawn much attention because they are found to have low phonon energy and mid-infrared transparency.…”

Nd-doped phosphate glass microstructured optical fiber laser

“…Since the first introduction [1,2], high perfor mance single frequency fiber oscillator and laser [3][4][5][6][7][8][9][10] have attracted considerable attention in the past few years. Good beam quality, robustness and suffi cient output are important characteristics for these laser systems.…”

“…Phosphate glass presents several benefits over silica, such as a high sol ubility for rare earth oxides, a 50% weaker SBS gain cross section and the absence of photodarkening even at high population inversion [11]. Due to the higher level of rare earth ion solubility without clustering effect in phosphate glass [12] than in silica, the length of the phosphate fiber laser can be substantially decreased even below ten centimeter at watt level sin gle frequency operation [7,13]. Although phosphate glass fiber suffers from higher loss than silica fiber, there is the substantial prospect for phosphate glass fiber application in compact high power single fre quency laser.…”

100-mW linear polarization single-frequency all-fiber seed laser for coherent Doppler lidar application

“…In [8,9], the output powers with watt-level CW single longitudinal mode fiber lasers by using the large area core phosphate glass fiber have been realized. However, the laser linewidth was very broad (about 0.04 nm, 5 GHz) and the polarization characteristic was also not proposed.…”