Controlled modification of organic polymer surfaces by continuous wave far-ultraviolet (185 nm) and pulsed laser (193 nm) radiation: XPS studies

1984 ◽  
Vol 106 (15) ◽  
pp. 4288-4290 ◽  
Author(s):  
Sylvain Lazare ◽  
Peter D. Hoh ◽  
John M. Baker ◽  
R. Srinivasan
Keyword(s):  
Continuous Wave ◽  
Pulsed Laser ◽  
Polymer Surfaces ◽  
Organic Polymer ◽  
Far Ultraviolet ◽  
193 Nm

Photoetching and modification of organic polymer surfaces with vacuum UV radiation

1993 ◽  
Vol 40 (1) ◽  
pp. 73-81 ◽  
Author(s):  
G.A. Takacs ◽  
V. Vukanovic ◽  
D. Tracy ◽  
J.X. Chen ◽  
F.D. Egitto ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Polymer Surfaces ◽  
Organic Polymer ◽  
Vacuum Uv Radiation ◽  
Vacuum Uv

scholarly journals Time-Resolved Quadrupole Mass Spectrometric Studies on Pulsed Laser Ablation of TiO2

1999 ◽  
Vol 18 (3) ◽  
pp. 99-109 ◽  
Author(s):  
Yongxin Tang ◽  
Zhenhui Han ◽  
Qizong Qin
Keyword(s):  
Laser Ablation ◽  
Continuous Wave ◽  
Center Of Mass ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Ionic Species ◽  
Mass Spectrometric ◽  
Quadrupole Mass ◽  
Time Resolved ◽  
Ambient Oxygen

Pulsed laser ablation of TiO2 at 355 nm and 532 nm has been investigated using an angleand time-resolved quadrupole mass spectrometric technique. The major ablated species include O (m/e = 16), O2 (m/e = 32), Ti (m/e = 48), TiO (m/e = 64) and TiO2 (m/e = 80). The time-of-flight (TOF) spectra of ablated species are measured for the ionic and neutral ablated species, and they can be fitted by a Maxwell – Boltzmann (M – B) distribution with a center-of-mass velocity. The measured angular distributions of the ionic species (O+ and Ti+) and the neutral species (O and Ti) can be fitted with cos⁡nθ and a cos⁡θ + (1−a)cos⁡nθ, respectively. In addition, a continuous wave oxygen molecular beam is introduced into the ablated plume, and the enhancement of the signal intensities of TiO is observed. It implies that the ablated Ti atoms/ions species can react with ambient oxygen molecules in the gas phase. In the meanwhile, the physicochemical mechanism of pulsed laser ablation of TiO2 is discussed.

Continuous-wave and Pulsed Laser Performance of Yb∶LuAG Single Crystal Fiber

2022 ◽  
Vol 43 (01) ◽  
pp. 42-50
Author(s):  
Xiao-fei MA ◽  
◽  
Tao WANG ◽  
Jian ZHANG ◽  
Yan-ru YIN ◽  
...  
Keyword(s):  
Single Crystal ◽  
Continuous Wave ◽  
Pulsed Laser ◽  
Laser Performance ◽  
Crystal Fiber

Thermal Modeling of the Cavity in Pulsed Excimer Laser Calorimeters

2000 ◽  
Author(s):  
D. H. Chen ◽  
Z. M. Zhang
Keyword(s):  
Laser Heating ◽  
Average Power ◽  
Pulsed Laser ◽  
Thermal Response ◽  
Element Model ◽  
Electrical Heating ◽  
Deep Ultraviolet ◽  
Simplified Finite Element Model ◽  
193 Nm ◽  
Pulsed Laser Heating

Abstract A simplified finite element model is built to study the thermal response of the 193-nm pulsed-laser calorimeter. The nonequivalence between pulsed-laser heating and electrical heating is estimated to be 0.46% at the thermocouple locations by comparing the calibration factors for average-power laser heating and electrical heating. This study should help the development of calibration and measurement standards in pulsed energy measurements for deep ultraviolet excimer lasers that are important for photolithographic and materials processing applications.

Analysis of data transmission technique based on pulsed laser

2012 ◽  
Vol 20 (1) ◽  
Author(s):  
T. Drozd ◽  
M. Zygmunt ◽  
P. Knysak ◽  
J. Wojtanowski
Keyword(s):  
Data Transmission ◽  
Continuous Wave ◽  
Pulsed Laser ◽  
Pulsed Lasers ◽  
Transmission Method ◽  
Transmission Systems ◽  
Laser Technology ◽  
Light Pulses ◽  
Transmission Technique ◽  
Transmission Speed

AbstractPulsed lasers are used mainly in lidar systems as sources of short and highly energetic light pulses. In data transmission systems continuous wave lasers are typically applied, however it is also possible to use pulsed lasers in such systems. Such approach seems to be especially reasonable for devices where a pulsed laser is applied anyway and executes another function (rangefinding). The article discusses a data transmission concept based on a pulsed laser technology. Advantages and limits of such a transmission method are described. Influence of individual transmission elements on the effective data transmission speed is analysed.

Towards temperature controlled retinal laser treatment with a single laser at 10 kHz repetition rate

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mario Mordmüller ◽  
Viktoria Kleyman ◽  
Manuel Schaller ◽  
Mitsuru Wilson ◽  
Dirk Theisen-Kunde ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Laser Treatment ◽  
Repetition Rate ◽  
Continuous Wave ◽  
Cell Damage ◽  
Pulsed Laser ◽  
Extended Kalman Filtering ◽  
Tissue Heating ◽  
Pulsed Heating ◽  
Measurement And Control

Abstract Laser photocoagulation is one of the most frequently used treatment approaches in ophthalmology for a variety of retinal diseases. Depending on indication, treatment intensity varies from application of specific micro injuries down to gentle temperature increases without inducing cell damage. Especially for the latter, proper energy dosing is still a challenging issue, which mostly relies on the physician’s experience. Pulsed laser photoacoustic temperature measurement has already proven its ability for automated irradiation control during laser treatment but suffers from a comparatively high instrumental effort due to combination with a conventional continuous wave treatment laser. In this paper, a simplified setup with a single pulsed laser at 10 kHz repetition rate is presented. The setup combines the instrumentation for treatment as well as temperature measurement and control in a single device. In order to compare the solely pulsed heating with continuous wave (cw) tissue heating, pulse energies of 4 µJ were applied with a repetition rate of 1 kHz to probe the temperature rise, respectively. With the same average laser power of 60 mW an almost identical temporal temperature course was retrieved in both irradiation modes as expected. The ability to reach and maintain a chosen aim temperature of 41 °C is demonstrated by means of model predictive control (MPC) and extended Kalman filtering at a the measurement rate of 250 Hz with an accuracy of less than ±0.1 °C. A major advantage of optimization-based control techniques like MPC is their capability of rigorously ensuring constraints, e.g., temperature limits, and thus, realizing a more reliable and secure temperature control during retinal laser irradiation.

scholarly journals Laser-Induced Biochar Formation through 355 nm Pulsed Laser Irradiation of Wood, and Application to Eco-Friendly pH Sensors

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1904
Author(s):  
Sung-Yeob Jeong ◽  
Chan-Woo Lee ◽  
Jun-Uk Lee ◽  
Yong-Won Ma ◽  
Bo-Sung Shin
Keyword(s):  
Laser Irradiation ◽  
Agricultural Land ◽  
Ph Sensor ◽  
Pulsed Laser ◽  
Agricultural Products ◽  
Organic Polymer ◽  
Ph Sensing ◽  
Ph Sensors ◽  
Linear Change ◽  
Pulsed Laser Irradiation

Due to the limited availability of agricultural land, pH sensing is becoming more and more important these days to produce efficient agricultural products. Therefore, to fabricate eco-friendly and disposable sensors, the black carbon, which is called biochar, is formed by irradiation of a UV pulsed laser having a wavelength of 355 nm onto wood and applying the resulting material as a pH sensor. The surfaces of three types of wood (beech, cork oak, and ash) were converted to the graphitic structure after UV laser irradiation; their morphologies were investigated. In addition, since the content of lignin, an organic polymer, is different for each wood, optimal laser irradiation conditions (laser fluence) needed to form these woods into pH sensors were considered. Depending on the degree of oil-like material generated after laser irradiation, a disposable pH sensor that can be used from one to three times is fabricated; due to the environmental characteristics of wood and biochar, the sensor shows high availability in that it can be easily discarded after use on agricultural land. After that, it can be used as filter in soil. Our wood-based pH sensor sensitively measures sequential changes from pH 4 to pH 10 and shows a very linear change of △R/R, indicating its potential for use in agriculture.

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