scholarly journals Luminescence of Femtosecond Laser-Processed ZnSe Crystal

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Igor Dmitruk ◽  
Nataliya Berezovska ◽  
Volodymyr Degoda ◽  
Yevhen Hrabovskyi ◽  
Roman Kolodka ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Beam ◽  
Single Crystal ◽  
Visible Region ◽  
High Spatial Frequency ◽  
Structural Defects ◽  
Beam Polarization ◽  
Central Wavelength ◽  
Fs Laser ◽  
Znse Single Crystal

The ZnSe single crystal treatment in air environment with linearly polarized Ti/sapphire femtosecond (fs)laser pulses of the energy density of around 0.04-0.05 J/cm2 with central wavelength of 800 nm and the pulse duration of 140 fs at a repetition rate of 1 kHz generates the laser-induced periodic surface structures (LIPSSs). The setup with a cylindrical quartz lens at normal incidence allowed processing a relatively large area of the ZnSe sample in one pass of the laser beam. Morphology analysis of LIPSS by scanning electron microscopy (SEM) and image processing reveals the existence of two periods of around 200.0 nm and 630.0 nm simultaneously. All LIPSSs demonstrate the orientation perpendicular to the laser beam polarization. The possible nature of LIPSS formation on ZnSe single crystal is caused by the synergetic influence of the interference mechanism involving surface plasmon polaritons and hydrodynamic effects of surface morphology modification. The fs-laser-induced changes of carrier concentrations in ZnSe specify obtained periods of high spatial frequency LIPSS. The influence of femtosecond laser processing on luminescent properties of ZnSe single crystal has been studied by an analysis of the photoluminescence (PL) and X-ray luminescence (XRL) spectra of laser-treated and untreated areas in the visible region of spectrum at room and low temperatures. The PL spectra and XRL spectra, as well as temperature dependencies of XRL spectra or thermally stimulated luminescence curves, demonstrate a good correlation for untreated and fs-laser-treated ZnSe surfaces. Specific PL bands related to the extended structural defects do not appear for LIPSS at the ZnSe sample under an excitation of 337 nm (3.68 eV). The Relative intensities and position of separate components of observed luminescence bands after ultrashort laser treatment do not change significantly. Thus, the structural perfection of the ZnSe single crystal surface is preserved.

Fabrication and Characterization of Si Nano-Columns by Femtosecond Laser

2012 ◽  
Vol 16 ◽  
pp. 15-20 ◽  
Author(s):  
Omid Tayefeh Ghalehbeygi ◽  
Vural Kara ◽  
Levent Trabzon ◽  
Selcuk Akturk ◽  
Huseyin Kizil
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Laser Beam ◽  
Chemical Etching ◽  
Silicon Surface ◽  
Laser Pulses ◽  
Laser Beam Profile ◽  
Fs Laser ◽  
Fabrication And Characterization

We fabricated Si Nano-columns by a femtosecond laser with various wavelengths and process parameters, whilst the specimen was submerged in water. The experiments were carried out by three types of wavelengths i.e. 1030 nm, 515nm, 343nm, with 500 fs laser pulses. The scales of these spikes are much smaller than micro spikes that are constructed by laser irradiation of silicon surface in vacuum or gases like SF6, Cl2. The Si nano-columns of 300 nm or less in width were characterized by SEM measurements. The formation of these Si Nano-columns that were revealed by SEM observation, indicates chemical etching with laser ablation occurred when surface exposed by laser beam. We observed 200 nm spikes height at the center of laser beam profile and the ones uniform in height at lateral incident area.

Electronic Properties of Femtosecond Laser Induced Modified Spots on Single Crystal Silicon Carbide

2010 ◽  
Vol 645-648 ◽  
pp. 239-242 ◽  
Author(s):  
Takuro Tomita ◽  
M. Iwami ◽  
M. Yamamoto ◽  
M. Deki ◽  
Shigeki Matsuo ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Femtosecond Laser ◽  
Single Crystal ◽  
Specific Resistance ◽  
Single Crystal Silicon ◽  
Metal Contacts ◽  
Crystal Silicon ◽  
Current Voltage ◽  
Fs Laser ◽  
Current Voltage Characteristics

Femtosecond (fs) laser modification on single crystal silicon carbide (SiC) was studied from the viewpoints of electric conductivity. Fourier transform infrared (FTIR) spectroscopy was carried out on femtosecond laser modified area. The intensity decrease of reststrahlen band due to the modification was observed, and this decrease was explained by the degradation of crystallinity due to the laser irradiation. Polarization dependence of reststrahlen band was also observed on laser modified samples. Current-voltage characteristics and Hall measurements on fs-laser modified region were carried out by fabricating the metal contacts on the ion implanted areas. The specific resistance up to 5.9×10-2 m was obtained for fs-laser modified area.

Fabrication of Anti-reflection Microstructures on ZnSe Single Crystal by Using Femtosecond Laser Pulses

2017 ◽  
Author(s):  
Mikhail K. Tarabrin ◽  
Andrey A. Bushunov ◽  
Vladimir A. Lazarev ◽  
Valeriy E. Karasik ◽  
Vladimir I. Kozlovskiy ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Single Crystal ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Znse Single Crystal

scholarly journals Bitmap and Vectorial Hologram Recording by Using Femtosecond Laser Pulses

2021 ◽  
Author(s):  
Yurii Kotsiuba ◽  
Ihor Hevko ◽  
Stefano Bellucci ◽  
Iaroslav Gnilitskyi
Keyword(s):  
Femtosecond Laser ◽  
Laser Beam ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Beam Polarization ◽  
Hologram Recording ◽  
Light Modulator ◽  
Recording Technology ◽  
Half Wave ◽  
Recording Process

Abstract In this paper, we present two approaches for recording a quasi-hologram on the steel surface by femtosecond laser pulses. The recording process is done by rotating the polarization of the laser beam by a half-wave plate or a spatial light modulator (SLM), so we can control the spatial orientation of the formed laser-induced periodic surface structures (LIPSS). Two different approaches are shown, which use vector and bitmap images to record the hologram. For the first time to our knowledge, we managed to record a hologram of a bitmap image by continuously adjusting the laser beam polarization by SLM during scanning. The developed method can sabstantially improve hologram recording technology by increasing its speed, reducing the price, and eliminating complex processing procedures.

Fabrication of Optical Microlenses in Glass Using a Femtosecond Laser for LBA-on-a-Chip Applications

2006 ◽  
Author(s):  
Y. Cheng ◽  
H. L. Tsai
Keyword(s):  
Femtosecond Laser ◽  
Laser Beam ◽  
Chemical Etching ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Lab On A Chip ◽  
Selective Removal ◽  
Curved Surfaces ◽  
Photosensitive Glass ◽  
Fs Laser

We describe the fabrication of microoptical cylindrical and hemispherical lenses vertically embedded in a photosensitive Foturan glass by femtosecond (fs) laser three-dimensional (3D) micromachining. The process is mainly composed of four steps: (1) fs laser scanning in the photosensitive glass to form curved surfaces (spherical and/or cylindrical); (2) postannealing of the sample for modification of the exposed areas; (3) chemical etching of the sample for selective removal of the modified areas; and (4) second postannealing for smoothening the surfaces of the tiny lenses. We examine the focusing ability of the microoptical lenses using a He-Ne laser beam, showing great potential of using these microoptical lenses in lab-on-a-chip applications.

Growth of Fresnoite Single Crystal Tracks Inside Glass Using Femtosecond Laser Beam Followed by Heat Treatment

2018 ◽  
Vol 18 (11) ◽  
pp. 7183-7190 ◽  
Author(s):  
Alexey S. Lipatiev ◽  
Ivan A. Moiseev ◽  
Sergey V. Lotarev ◽  
Tatiana O. Lipateva ◽  
Mikhail Yu. Presnyakov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Femtosecond Laser ◽  
Laser Beam ◽  
Single Crystal ◽  
Femtosecond Laser Beam

scholarly journals Bitmap and vectorial hologram recording by using femtosecond laser pulses

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Y. Kotsiuba ◽  
I. Hevko ◽  
S. Bellucci ◽  
I. Gnilitskyi
Keyword(s):  
Femtosecond Laser ◽  
Laser Beam ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Beam Polarization ◽  
Hologram Recording ◽  
Light Modulator ◽  
Recording Technology ◽  
Half Wave ◽  
The Cost

AbstractIn this paper, we present two approaches for recording a quasi-hologram on the steel surface by femtosecond laser pulses. The recording process is done by rotating the polarization of the laser beam by a half-wave plate or a spatial light modulator (SLM), so we can control the spatial orientation of the formed laser-induced periodic surface structures (LIPSS). Two different approaches are shown, which use vector and bitmap images to record the hologram. For the first time to our knowledge, we managed to record a hologram of a bitmap image by continuously adjusting the laser beam polarization by SLM during scanning. The developed method can substantially improve hologram recording technology by eliminating complex processing procedures, which can lead to increasing the fabrication speed and reducing the cost.

scholarly journals Optimized Growth and Laser Application of Yb:LuAG Single-Crystal Fibers by Micro-Pulling-Down Technique

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 78
Author(s):  
Anye Wang ◽  
Jian Zhang ◽  
Shuai Ye ◽  
Xiaofei Ma ◽  
Baiyi Wu ◽  
...  
Keyword(s):  
Single Crystal ◽  
High Power ◽  
Slope Efficiency ◽  
Continuous Wave ◽  
Beam Quality ◽  
Axial Direction ◽  
Optical Quality ◽  
Central Wavelength ◽  
High Power Lasers ◽  
Crystal Fibers

Single-crystal fibers (SCFs) have a great application potential in high-power lasers due to their excellent performance. In this work, high-quality and crack-free Yb3+:Lu3Al5O12 (Yb:LuAG) SCFs were successfully fabricated by the micro-pulling-down (μ-PD) technology. Based on the laser micrometer and the X-ray Laue diffraction results, these Yb:LuAG SCFs have a less than 5% diameter fluctuation and good crystallinity along the axial direction. More importantly, the distribution of Yb ions is proved to be uniform by electron probe microanalysis (EPMA) and the scanning electron microscope (SEM). In the laser experiment, the continuous-wave (CW) output power using a 1 mm diameter Yb:LuAG single-crystal fiber is determined to be 1.96 W, at the central wavelength of 1047 nm, corresponding to a slope efficiency of 13.55%. Meanwhile, by applying a 3 mm diameter Yb:LuAG SCF, we obtain a 4.7 W CW laser output at 1049 nm with the slope efficiency of 22.17%. The beam quality factor M2 is less than 1.1 in both conditions, indicating a good optical quality of the grown fiber. Our results show that the Yb:LuAG SCF is a potential solid-state laser gain medium for 1 μm high-power lasers.

Study on the Laser Beam Polarization Based on LabVIEW

2021 ◽  
Author(s):  
Xiaoting Sun ◽  
Yongliang Li ◽  
Yingming Zhang ◽  
Chenwen Hu ◽  
Zhiwen Chen
Keyword(s):  
Laser Beam ◽  
Beam Polarization ◽  
Laser Beam Polarization
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