PbS:glass as broad-bandwidth near-infrared light source material

Area of Science:

• Materials Science
• Optoelectronics
• Glass Science

Background:

• Lead sulfide (PbS) nanoparticles embedded in glass matrices are promising for optical applications.
• Controlling the size and distribution of PbS nanoparticles is crucial for tuning optical properties.
• Developing efficient light emitters requires materials with broad and tunable emission spectra.

Purpose of the Study:

• To fabricate and characterize silicate- and borosilicate-based PbS:glass materials and fibers.
• To investigate the influence of growth and annealing conditions on the optical properties of PbS:glass.
• To explore the potential of PbS:glass fibers for creating broad-bandwidth light emitters.

Main Methods:

• Fabrication of PbS:glass materials and borosilicate-glass-based fibers.
• Optical characterization including absorption and emission spectroscopy.
• Analysis of material properties under varying growth and annealing conditions.
• Fiber pulling and determination of confinement factor.
• Annealing of fibers in a gradient furnace to tune emission properties.

Main Results:

• Achieved PbS volume fractions exceeding 0.4% in silicate glasses.
• Observed octave-spanning emission spectra with a halfwidth of 940 nm.
• Fabricated fiber bundles with PbS:glass fibers and determined a confinement factor (Γ) of 0.00406.
• Successfully tuned and spectrally widened emission bandwidth by annealing fibers.

Conclusions:

• PbS:glass materials exhibit significant potential for broad-bandwidth light emission.
• Annealing is an effective method for tuning and widening emission spectra in PbS:glass fibers.
• The developed materials and fibers pave the way for optically pumped broad-bandwidth light emitters.