LIGHT EMITTING MODULE AND METHOD FOR GENERATING ULTRABROADBAND NEAR-INFRARED LIGHT

摘要

The present invention discloses a light emitting module and a method for generating ultrabroadband near-infrared light and increasing the bandwidth and output power. The light emitting module includes a linearly polarized laser pump for generating a visible laser, a half-wave plate for adjusting the to polarization orientation of the visible laser, and a crystal optical fiber disposed on the output light path of the half-wave plate. The core of the crystal optical fiber is made of forsterite (Mg2SiO4) doped with Cr3+ and Cr4+ ions. The doping process comprises: depositing a chromium oxide layer on the lateral surface of the core and driving the chromium atoms into the core by high temperature diffusion; coupling the visible laser into the core to produce a spontaneous emission with wavelengths from 750 to 1350 nm continuously. Particularly, the continuous spectrum is adjustable by changing the polarization orientation of the visible laser via the half-wave plate.

主权项

1. A light emitting module of ultrabroadband near-infrared light comprising:
a primal pump light source, adapted to generate a linearly polarized visible laser; a half-wave plate, disposed in an output light path of the linearly polarized visible laser, to regulate a polarization orientation of said visible laser; and a crystal optical fiber, disposed in an output light path of the half-wave plate, comprising a core made of forsterite crystal doped with trivalent chromium ions (Cr3+) and tetravalent chromium ions (Cr4+) such that a chromium doping process is performed as that a chromium oxide layer (Cr2O3) is deposited on a lateral surface of the core, and the chromium ions are driven and deposited into the core by high temperature diffusion, wherein the trivalent chromium ions (Cr3+) and tetravalent chromium ions (Cr4+) in the core are suitably stimulated by said visible laser to generate an amplified spontaneous emission having a combinational overlapping continuous spectrum with wavelength in range from 750 to 1350 nm such that a spectral intensity distribution and a full width at half maximum (FWHM) of said continuous spectrum is adjustable by changing the polarization orientation of the visible laser via the half-wave plate.