Arterial pressure responses of a rat to laser stimulation of the vagus nerve using infrared irradiation in continuous-wave mode

2021 ◽  
Author(s):  
Ozan Yetis ◽  
Ibrahim Akkaya ◽  
Ozge Guner ◽  
M. Ensari Guneli ◽  
Serhat Tozburun
Keyword(s):  
Arterial Pressure ◽  
Vagus Nerve ◽  
Continuous Wave ◽  
Wave Mode ◽  
Infrared Irradiation ◽  
Laser Stimulation ◽  
Continuous Wave Mode ◽  
Stimulation Of

Standoff Detection of Oil and Powder Mixtures at 12 Meters Using a Tunable Quantum Cascade Laser-Based System with a Close Focus Telescope and Uncooled Infrared Detector

2021 ◽  
pp. 000370282110603
Author(s):  
J. Chance Carter ◽  
Phillip H. Paul ◽  
Joshua M. Ottaway ◽  
Peter Haugen ◽  
Anastacia M. Manuel
Keyword(s):  
Quantum Cascade Laser ◽  
Continuous Wave ◽  
Infrared Detector ◽  
Wave Mode ◽  
Infrared Source ◽  
Powder Mixtures ◽  
Quantum Cascade ◽  
System A ◽  
Continuous Wave Mode ◽  
Lock In

We have designed and demonstrated a quantum cascade laser (QCL) based standoff system that utilizes an uncooled mercury cadmium telluride (MCT) detector with lock-in signal processing for chemical identification at a distance of 12.5 meters in indoor ambient light conditions. In the system, a tunable quad-QCL operating (1 MHz) in quasi-continuous wave mode between 8.45 and 10.03 μm (∼1182 to 1000 cm−1) serves as the active mid-infrared source for remotely interrogating mineral, powder, and thin film oil samples including powder mixtures (6, 12.5, 25, and 50%) of crystalline quartz (SiO2) in KBr. Light as reflected from a given sample is collected using a 10-inch (25.4 cm) Dall Kirkham telescope and coupled with ZnSe optics to an uncooled MCT detector. The mixture dependence of the highly transparent KBr and strongly absorbing quartz was found to fit a modified version of the Schatz reflectance model for compacted powder mixtures. All reflectance spectra reported are relative to an Au-coated diffuse reflector. A NIST traceable polystyrene standard reflector was also used to determine the QCL wavelength tuning range and calibration.

Stable continuous-wave mode-locked laser from a 1645 nm Er:YAG ceramic oscillator

2022 ◽  
Author(s):  
Yangyu Liu ◽  
Xue Cao ◽  
AnHua Xian ◽  
Guangmiao Liu ◽  
Wei zhou ◽  
...  
Keyword(s):  
Solid State ◽  
Pulse Width ◽  
Peak Power ◽  
Continuous Wave ◽  
Modulation Depth ◽  
Average Power ◽  
Mode Locking ◽  
Wave Mode ◽  
Semiconductor Saturable Absorber ◽  
Continuous Wave Mode

Abstract We demonstrate stable continuous-wave mode-locking (CWML) pulses around 1645nm by employing the home-made Er:YAG ceramic. By using a fiber laser and semiconductor saturable absorber mirror (SESAM) with modulation depth of 1.2%, we get ML pulses with the output average power up to 815 mW, the pulse width shortened as ~4 ps, and the peak power of 1.8 kW. With the SESAM of modulation depth of 2.4%, the second-order harmonic ML pulses were also obtained. As far as we know, this is the first report of CWML from Er3+-doped ceramics and also the shortest pulse duration in Er3+-doped solid-state oscillators.

Passively continuous-wave mode-locked Er^3+-doped ZBLAN fiber laser at 28 μm

2012 ◽  
Vol 37 (18) ◽  
pp. 3849 ◽  
Author(s):  
Chen Wei ◽  
Xiushan Zhu ◽  
R. A. Norwood ◽  
N. Peyghambarian
Keyword(s):  
Fiber Laser ◽  
Continuous Wave ◽  
Wave Mode ◽  
Continuous Wave Mode

scholarly journals High-power terahertz quantum cascade lasers with ∼0.23 W in continuous wave mode

AIP Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 075210 ◽  
Author(s):  
Xuemin Wang ◽  
Changle Shen ◽  
Tao Jiang ◽  
Zhiqiang Zhan ◽  
Qinghua Deng ◽  
...  
Keyword(s):  
High Power ◽  
Continuous Wave ◽  
Quantum Cascade Lasers ◽  
Wave Mode ◽  
Quantum Cascade ◽  
Continuous Wave Mode ◽  
Cascade Lasers

Laser Power Density Dependence in Absorption Measurements

1980 ◽  
Vol 34 (3) ◽  
pp. 311-313
Author(s):  
Peter M. Castle
Keyword(s):  
Power Density ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Continuous Wave ◽  
Strong Dependence ◽  
Wave Mode ◽  
Input Power ◽  
Absorption Cross ◽  
Continuous Wave Mode ◽  
Absorption Measurements

The absorption cross section of CF2Cl2 has been measured as a function of presure and CO2 laser input power at 10.764 μm. The laser was operated in the continuous wave mode providing a continuous energy deposition in the sample. It is shown that the absorption cross section measured has a strong dependence on input power density in the range from 5 to 15 W/cm2 and pressure in the 3 to 50 Torr regime. It is demonstrated that most of these effects can be attributed to the temperature rise in the beam interaction volume.

scholarly journals Structural characterization of laser-treated Cr3C2–NiCr coatings

2001 ◽  
Vol 16 (12) ◽  
pp. 3416-3422 ◽  
Author(s):  
P. Serra ◽  
J. M. Miguel ◽  
J. L. Morenza ◽  
J. M. Guilemany
Keyword(s):  
Wear Resistance ◽  
Continuous Wave ◽  
Wave Mode ◽  
Superficial Layer ◽  
Corrosion And Wear ◽  
Crack Network ◽  
Interconnected Porosity ◽  
Laser Treatments ◽  
Continuous Wave Mode

The interconnected porosity of the Cr3C2–NiCr coatings obtained by high-velocity oxy fuel spraying is detrimental in corrosion and wear resistance applications. Laser treatments allow sealing of their surfaces through melting and resolidification of a thin superficial layer. A Nd:YAG laser beam was used to irradiate Cr3C2–NiCr coatings either in the continuous wave mode or at different repetition rates in the pulsed one. Results indicated that high peak and low mean laser irradiances are not good, since samples presented deep grooves and an extensive crack network. At low peak and higher mean laser irradiances the surface was molten, and only a few shallow cracks were observed. The interconnected porosity was completely eliminated in a layer up to 80 μm thick, formed by large Cr7C3 grains imbedded in a NiCr matrix.

Sign in / Sign up

Export Citation Format

Share Document