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 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.

The diffraction-ray model of single filamentation of femtosecond laser pulses for estimating characteristics of the multiple filamentation domain in air

2021 ◽  
Vol 64 (1) ◽  
pp. 154-164
Author(s):  
A.A. Zemlyanov ◽  
◽  
Y.E. Geints ◽  
O.V. Minina ◽  
◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Beam ◽  
Peak Power ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Small Scale ◽  
Beam Forming ◽  
Physical Processes ◽  
Multiple Filamentation ◽  
Number Increase

The characteristics of the domain of multiple filamentation of femtosecond laser pulses in air were estimated based on the single filamentation model. As the single filamentation model, the diffraction-ray model is considered. It is based on the representation of a laser beam as a set of diffraction-ray tubes nested in each other that do not intersect in space and do not exchange energy with each other. In this situation changes in tubes shape and cross section during propagation demonstrate the effect of physical processes that occur with radiation in the medium. It is shown that the use of this model for interpreting experimental results and predicting effects is effective. In particular, it was demonstrated that the radius of small-scale intensity inhomogeneities in the profile of a centimeter laser beam, forming the domain of multiple filamentation of subterawatt femtosecond laser pulses, is several millimeters. The power in these inhomogeneities varies from several units to several tens of gigawatts. Telescoping the initial laser beam, leading to an increase in its radius, also expands the sizes of the initial small-scale intensity inhomogeneities and reduces the power contained in them. As a result of this, the coordinate of the filamentation beginning shifts along the path from the source of laser pulses. As the peak power in the beam increases, the length of the filaments and their number increase.

SUBWAVELENGTH PERIODIC RIPPLE FORMATION ON GaN SURFACE BY FEMTOSECOND LASER PULSES

2005 ◽  
Vol 12 (04) ◽  
pp. 651-657 ◽  
Author(s):  
X. C. WANG ◽  
G. C. LIM ◽  
F. L. NG ◽  
W. LIU ◽  
S. J. CHUA
Keyword(s):  
Femtosecond Laser ◽  
Laser Beam ◽  
Defect Density ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Pulse Number ◽  
Process Window ◽  
Incident Laser ◽  
Ripple Formation ◽  
Periodic Surface Structure

The formation of femtosecond pulsed laser-induced periodic surface structure on GaN is reported for the first time (to our knowledge) in this paper. It has been found that the formation of the laser-induced ripples is very much dependent and quite sensitive to the laser conditions of the incident laser beam energy fluence and pulse numbers. Possibly due to the unique property of high-defect density of GaN material, the process window for laser-induced ripple formation is quite narrow compared to other materials such as InP , GaP , Al 2 O 3 etc. Nevertheless, through finely adjusting laser beam fluence and pulse number, subwavelength periodic ripples could be formed on the GaN surface. The formation of such periodic two-dimensional structures was attributed to optical interference of the incident laser light with scattered waves from a surface disturbance. Photoluminescence emission could still be detected on the GaN ripple area, indicating little degradation of GaN optical property after femtosecond laser processing. The femtosecond laser-induced ripple structure has potential applications in the fabrication of nanostructures for the GaN -based devices.

Inorganic-organic Hybrid Materials for Real 3-D Sub-νm Lithography

2003 ◽  
Vol 780 ◽  
Author(s):  
R. Houbertz ◽  
J. Schulz ◽  
L. Fröhlich ◽  
G. Domann ◽  
M. Popall ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Sol Gel ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Hybrid Polymer ◽  
Organic Hybrid ◽  
Two Photon ◽  
Applied Technology ◽  
Scale Structures ◽  
Sol Gel Synthesis

AbstractReal 3-D sub-νm lithography was performed with two-photon polymerization (2PP) using inorganic-organic hybrid polymer (ORMOCER®) resins. The hybrid polymers were synthesized by hydrolysis/polycondensation reactions (modified sol-gel synthesis) which allows one to tailor their material properties towards the respective applications, i.e., dielectrics, optics or passivation. Due to their photosensitive organic functionalities, ORMOCER®s can be patterned by conventional photo-lithography as well as by femtosecond laser pulses at 780 nm. This results in polymerized (solid) structures where the non-polymerized parts can be removed by conventional developers.ORMOCER® structures as small as 200 nm or even below were generated by 2PP of the resins using femtosecond laser pulses. It is demonstrated that ORMOCER®s have the potential to be used in components or devices built up by nm-scale structures such as, e.g., photonic crystals. Aspects of the materials in conjunction to the applied technology are discussed.

Ablation of metals with femtosecond laser pulses

2001 ◽  
Author(s):  
K. H. Leong ◽  
T. Y. Plew ◽  
R. L. Maynard ◽  
A. A. Said ◽  
L. A. Walker
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses
Sign in / Sign up

Export Citation Format

Share Document