Method for fabricating a light emitting module that generates ultrabroadband near-infrared light

A method for fabricating a light emitting module that generates ultrabroadband near-infrared light, comprising steps of:

• providing a primal pump light source for generating a linearly polarized visible laser;
• disposing a half-wave plate in an output light path of the linearly polarized visible laser, to regulate a polarization orientation of the linearly polarized visible laser;
• and
• disposing a crystal optical fiber in an output light path of the half-wave plate, wherein the crystal optical fiber is produced by steps of:
• providing a seed crystal fiber of forsterite crystal doped with tetravalent chromium ions (Cr4+), wherein the seed crystal fiber has an original diameter;
• pulling the seed crystal fiber for reducing the original diameter down to a reduced diameter, to form a core of the crystal optical fiber;
• depositing a chromium oxide layer (Cr2O3) on a lateral surface of the core with the reduced diameter, in order to provide trivalent chromium ions (Cr3+) for the core;
• performing a high temperature heating process to diffuse the trivalent chromium ions (Cr3+) from the chromium oxide layer into the core, so as to increase a doping concentration of the trivalent chromium ions (Cr3+) in the core;
• and
• forming a clad on the core.