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Meeting MS&T23: Materials Science & Technology
Symposium Solid-state Optical Materials and Luminescence Properties
Presentation Title Surface Morphology and Fracturing of Femtosecond Laser-irradiated Calcium Fluoride
Author(s) Emma DeAngelis, Justin Twardowski, Conrad Kuz, Enam Chowdhury
On-Site Speaker (Planned) Emma DeAngelis
Abstract Scope CaF2 is a high bandgap material which transmits light ranging from mid-IR to far-UV, making it a very useful optical material for high power laser applications. When exposed to ultrashort laser pulses significantly higher than the damage threshold, CaF2 exhibits surface fractures that lie along the (100) cleavage planes and appear as raised bands above a laser-ablated crater. In this work, CaF2 with a polished (100) surface was irradiated with 1030 nm, 77 fs pulses, resulting in rectangular cracks. Similar femtosecond laser damage features have been found in cubic crystals such as NaCl and MgO, as well as monoclinic β-Ga2O3. This unique damage morphology may be due to anisotropic thermal conductivity, which causes thermal stress to overcome mechanical strength more easily in crystallographic directions with low conductivity. Laser-induced defects may also play a role by deforming the lattice and fracturing, rather than thermally relaxing. 


A New Family of Multinary Telluride Nanocrystals for Infrared Applications
Crystallography, Phase Stability and Luminescence Behavior of Eu-doped Ca4-xSrxLaO(BO3)3 Compounds
D-20: Fabrication and Optical Property Characterization of Silver Thin Film Using Magnetron Sputtering Method
Development of Non-cubic Fluorapatite Laser Ceramics
Fabrication and Optical Properties of Transparent Zinc Gallate Spinel Ceramics
Leveraging Material Microstructure and Linear/Non-linear Absorption for Pulsed Laser Welding of Ceramics
Overview of Optical Materials at NRL
Photoluminescent Behaviors of Mixed Metal Thiophosphates XScP2S6 (X=Ag, Cu) Above and Below Bandgap
Processing and Optical Properties of Noncubic RE-doped Ga2O3 Transparent Ceramics
Study of Garnet Scintillating Single Crystal Fiber Grown by Laser Heated Pedestal Growth Method
Study of Surface Effects in Yb3+ Doped Garnet Nanopowders for Understanding Grain Boundary Processes in Laser Ceramics: Fabrication and Spectroscopic Properties
Surface Morphology and Fracturing of Femtosecond Laser-irradiated Calcium Fluoride
Ultrafast Laser-induced Damage and Non-linear Optical Properties of Metal Thiophosphates
Ultraviolet Excitation of Trivalent Europium in Alumina

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