Optics and Laser Technology

Removal of microsphere particles from the surface of the substrate by the directional shockwave induced by the laser pulse emitted from the “micro-gun” propulsion system tip

These dataset is the original data of paper "A modified formula of thermal focal length for lamp pumping Cr,Er:YSGG crystal with high performance 2.79 μm laser".

Under the pump power of 8.84 W, the maximum single pulse energy of 12.8 μJ and peak power of 30 W can be obtained, corresponding to the perfect pulse duration and maximum repetition rate of 427 ns and 82 kHz, respectively. It is the first presentation of such kind of WSe2-SA employed in a solid-state Q-switched crystalline laser at 2 μm, to the best of our knowledge.

Melt pool area acquired for the three different processing strategies.

Cut front & kerf profile data given as polynomial equations of the curve fit. The appended data is rotated 90 degrees counterclockwise (both Cut front & kerf profile). Because of this the Left kerf corresponds with the lower kerf and the right kerf with the upper kerf. File name explanation: 2mm_Fibre_CutFront_Equation.mat: Cut front data for Fibre laser cutting of 2 mm sheets. Data in the form of polynomial equation. 3mm_CO2_Kerf_Equation.mat: Lower (left) & Upper (right) kerf data for CO2 laser cutting of 3 mm sheets. Data in the form of polynomial equation. The following concerning cut front data; In the *.mat files, the equations are stored as Matlab cfit structures: fitobject: cfit structure for cut front polynomial equation. The following concerning the kerf profile data; In the *.mat files, the equations are stored as Matlab cfit structures: fitobjectLower: cfit structure for lower kerf polynomial equation. fitobjectUpper: cfit structure for upper kerf polynomial equation.

Cut front & kerf profile data given as x, y and z coordinates of polynomial curve fits. In *.txt files: y1 and z1 coordinates belong to the left kerf side. y2 and z2 coordinates belong to the right kerf side. The appended data is rotated 90 degrees counterclockwise (both Cut front & kerf profile). Because of this the Left kerf then corresponds with the lower kerf and right kerf with the upper kerf. File name explanation: 2mm_Fibre_CutFront_RawData.txt: Cut front data for Fibre laser cutting of 2 mm sheets. Data in the form of x and z coordinates. 3mm_CO2_Kerf_RawData.txt: Kerf data for CO2 laser cutting of 3 mm sheets. Data in the form of y and z coordinates.

All the images for Polarization Sagnac interferometer with reflective grating for white-light channeled imaging polarimeter

Raw data and partial code

We demonstrate the fabrication of low-loss optofluidic waveguides encapsulated in fused silica glass using femtosecond laser microfabrication followed by carbon dioxide laser irradiation. Spatially-shaped femtosecond laser-assisted chemical etching is first used to fabricate microchannels with circular cross-sections and a string of open extra-access ports in the glass. Further, the carbon dioxide laser direct writing on the glass surface is used to create a thermal reflow effect of etched glass microstructures for simultaneously polishing all internal surfaces of channels and sealing the extra-access ports. With this effect, the inner surface roughness of the etched microchannels can be reduced to ∼ 40 nm. Finally, a single-mode microfluidic optical waveguide with a propagation loss of ∼ 0.78 dB/cm at 1310 nm is obtained inside the glass by filling a mixture solution of decane and liquid paraffin into a laser-polished microchannel.

We demonstrate the spectroscopy and mid-infrared laser performance on the Ho:YAP oxide crystal grown by the Czochralski method in detail. The crystal belongs to orthorhombic system of Pnmb (62) space group and shows high crystalline quality. The lifetimes of 5I6 and 5I7 levels are 0.412 and 4.485 ms, respectively. Particularly, under 1150 nm Raman fiber laser pumping, a 3.01 μm CW laser with a maximum power of 181 mW and slope-efficiency of 3.35% is achieved. The M2 factor of 1.35/1.37 indicates that the yield laser has excellent beam quality. The results reveal that the Ho:YAP crystal possesses great potential for developing efficient 3.0 μm mid-infrared lasers.