High Power Lasers and Their New Applications

Izawa, Yasukazu; Miyanaga, Noriaki; Kawanaka, Junji; Yamakawa, Koichi

doi:10.3807/josk.2008.12.3.178

Cited by 41 publications

(22 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…High average power lasers have found their application in materials processing, 1 defense systems, 2,3 and fundamental research. 4 The challenge is not only to obtain multi-kilowatt output power but also to maintain near diffraction-limited beam quality. Solid-state lasers deserve special attention due to their compactness, performance, and reliability.…”

Section: Influence Of Beam Shape On Piston and Tilt Error In Coherentmentioning

confidence: 99%

Influence of beam shape on piston and tilt error in coherent combined laser array

Gontar

Jabczyński

2019

Opt. Eng.

View full text Add to dashboard Cite

An analysis of beam combining quality and the influence of beam profile on tilt and piston error tolerances is presented. We define beam combining performance metrics in terms of powers contained within a specific radius. It is shown that the selection of this radius has a significant effect on the obtained tolerance values. We have taken the tolerance limit as a decrease in intensity of 20%, for piston and tilt error. In addition, for the tilt error, as tolerance limit, we have taken a pointing error equal to the diffraction limit. Our analysis demonstrates that the beam combining performance metric based on the diffraction-limited radius functions best for describing the impact of aberrations on the coherent combined laser array optical system. Our results lead to two important conclusions. First, the tilt error has a greater impact on the degradation of beam quality. Second, a Gaussian beam has greater tolerance for both errors than a top-hat beam. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

show abstract

Section: Influence Of Beam Shape On Piston and Tilt Error In Coherentmentioning

confidence: 99%

Influence of beam shape on piston and tilt error in coherent combined laser array

Gontar

Jabczyński

2019

Opt. Eng.

View full text Add to dashboard Cite

show abstract

“…The laser diode bar (LDB) has found increasing numbers of applications, such as in pumping lasers and direct tools for material processing, by virtue of its higher ElectroOptic conversion efficiency, compact size, and long lifetime [1,2]. As the need for producing high optical power increases, issues of cooling and packaging become important for stable high-power operation [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Bypass Heat Sink Analysis for a Laser Diode Bar with a Top Canopy

Lee

Park

et al. 2017

Current Optics and Photonics

View full text Add to dashboard Cite

With the increasing use of high-power laser diode bars (LDBs) and stacked LDBs, the issue of thermal control has become critical, as temperature is related to device efficiency and lifetime, as well as to beam quality. To improve the thermal resistance of an LDB set, we propose and analyze a bypass heat sink with a top canopy structure for an LDB set, instead of adopting a thick submount. The thermal bypassing in the top-canopy structure is efficient, as it avoids the cross-sectional thermal saturation that may exist in a thick submount. The efficient thickness range of the submount in a typical LDB set is guided by the thermal resistance as a function of thickness, and the simulated bypassing efficiency of a canopy is higher than a simple analytical prediction, especially for thinner canopies.

show abstract

“…These laser pulses are used for a variety of applications, e.g., laser-driven electron [2,3] or ion-acceleration [4], the laser-based generation of x-rays [5], high energy physics [6] or laser-based proton radiography [4,7]. Most of these applications would strongly benefit or even ultimately require laser pulses with a well known temporal structure and a temporal intensity contrast as high as possible.…”

Section: Introductionmentioning

confidence: 99%

Generation of 25-TW Femtosecond Laser Pulses at 515 nm with Extremely High Temporal Contrast

et al. 2015

View full text Add to dashboard Cite

We report on the frequency doubling of femtosecond laser pulses at 1030 nm center wavelength generated from the fully diode-pumped laser system POLARIS. The newly generated pulses at a center wavelength of 515 nm have a pulse energy of 3 J with a pulse duration of 120 fs. On the basis of initially ultra-high contrast seed pulses we expect a temporal intensity contrast better 10 17 200 ps before the peak of the main pulse. We analyzed the temporal intensity contrast from milliseconds to femtoseconds with a dynamic range covering more than 20 orders of magnitude. The pulses were focussed with a f/2-focussing parabola resulting in a peak intensity exceeding 10 20 W/cm 2 . The peak power and intensity are to the best of our knowledge the highest values for 515 nm-laser-pulses achieved so far.

show abstract

High Power Lasers and Their New Applications

Cited by 41 publications

References 66 publications

Influence of beam shape on piston and tilt error in coherent combined laser array

Influence of beam shape on piston and tilt error in coherent combined laser array

Bypass Heat Sink Analysis for a Laser Diode Bar with a Top Canopy

Generation of 25-TW Femtosecond Laser Pulses at 515 nm with Extremely High Temporal Contrast

Contact Info

Product

Resources

About