Photo-Thermo-Refractive Glass Properties and Applications
Summary
Photo-thermo-refractive (PTR) glass is a photosensitive multi-component silicate matrix incorporating halides and metal dopants. Upon exposure to ultraviolet or ultrafast laser light and subsequent heat treatment, it undergoes controlled nucleation and crystallisation of nanometre-scale phases, leading to precise local refractive index modifications. These changes enable the direct inscription of volume Bragg gratings, photonic waveguides and diffractive optical elements with ultra-low optical loss and high laser damage threshold. The interplay of laser parameters, dopant chemistry and thermal protocols allows tailored microstructures and refractive landscapes. Emerging variants—including rare-earth-doped and halogen-substituted formulations—further broaden functionality, supporting active photonic devices, spectral beam combining, high-power laser optics and integrated on-chip systems.
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Photo-Thermo-Refractive Glass Properties and Applications publication trend
The graph below shows the total number of articles in photo-thermo-refractive glass properties and applications across all publications each year (not limited to Nature Index journals).
Technical terms
Photo-thermo-refractive glass: A photosensitive silicate glass doped with halides and metal ions that undergoes controlled crystallisation and refractive index change upon light exposure and heat treatment.
Volume Bragg grating: A periodic modulation of refractive index within a transparent medium used to diffract and filter light with high spectral and angular selectivity.
Gaussian-Bessel beam: A non-diffracting laser beam featuring a central intensity core and concentric rings, enabling deep and uniform energy deposition in transparent materials.
Refractive index modulation: A local change in the refractive index of a material, achieved here through nanoparticle or crystalline phase formation.
Q-switching: A technique to generate short, intense laser pulses by modulating the intracavity losses of a laser resonator.
References
- Nano-Crystal and Microstructure Formation in Fluoride Photo-Thermo-Refractive Glass Using Chirp-Controlled Ultrafast Laser Bessel Beams. Nanomaterials (2021).
- Ultrafast laser triggering nanocrystallization inside Nd-doped photo-thermo-refractive glass and its application in Q-switched laser.. Optics Express (2024).
- Chloride photo-thermo-refractive glasses. Optical Materials Express (2016).
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