Arvydas Kausas

Arvydas Kausas
Institute for Molecular Science · Laser research center

Master Degree in Laser Physics

About

41
Publications
2,776
Reads
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159
Citations
Introduction
I am working on high-energy, ns and sub-ns laser systems based on YAG material. By use of surface activated bonding, multiple transparent heat-sink and gain crystals are bonded in periodic structures for efficient heat extraction. We call this Distributed Face Cooling (DFC) chip. FEA simulations are use in my work to evaluate such DFC chip temperature and stress distribution. We were able to obtain 2J energy in Nd:YAG based amplifier system
Additional affiliations
January 2012 - February 2021
Institute for Molecular Science
Position
  • Researcher
Description
  • I am working on high-energy, ns and sub-ns laser systems based on YAG material. By use of surface activated bonding, multiple transparent heat-sink and gain crystals are bonded in periodic structures for efficient heat extraction. We call this Distributed Face Cooling (DFC) chip. FEA simulations are use in my work to evaluate such DFC chip temperature and stress distribution. We were able to obtain 2J energy in Nd:YAG based amplifier system
October 2010 - December 2011
Center for Physical Sciences and Technology
Position
  • Researcher
January 2010 - August 2010
National Institute of Advanced Industrial Science and Technology
Position
  • Intern
Education
September 2005 - June 2009
Vilnius University
Field of study
  • Laser Physics
September 2001 - June 2005
Vilnius University
Field of study
  • Phisics

Publications

Publications (41)
Article
Full-text available
We demonstrate a sub-nanosecond Joule-class room-temperature diode-pumped solid-state chip laser comprising of periodically bonded Nd:YAG and sapphire crystal plates and operating at 25 Hz, delivering the peak power over 3 GW. In addition, a model describing parasitic oscillations in a composite, high-gain media is developed.
Article
Full-text available
A Joule-class room-temperature diode-pumped solid-state laser was developed. The energy scaling of the 100 mJ 1064 nm seed pulse was realized by a series of two diode-pumped amplifiers. The gain medium consists in free combinations of Nd:YAG ceramics bonded to sapphire transparent heat sinks, to relax the thermal load induced by the 34 kW pump powe...
Conference Paper
Subnanosecond pulses of 2.3 J are generated at 25 Hz after two-stage amplification, based on room-temperature diode-pumped composite DFC-PowerChip Nd:YAG gain medium bonded to transparent Sapphire heat sinks.
Conference Paper
The PPMgLN is currently best candidate for intense THz generation using both of the DFG and chirp and delay method. Yb disk and DFC(Distributed Face Cooling) laser are developed for the two wavelength laser or chirped pulsed laser for the DFC and chirp and delay respectively.
Conference Paper
We have developed a 2-J at 1064 nm and 200-mJ at 266 nm laser system using Distributed-Faced-Cooling chips. This paper shows characteristics when the repetition rate was increased from 1 Hz to 20 Hz.
Conference Paper
The laser induced damage in crystals with inhomogeneity can be distinguished as derived from an intrinsic factor and deterioration factors. We investigated the dependency of each damage threshold value upon irradiated laser beam condition.
Conference Paper
1.5 at.% Cr ³⁺ :LiSrAlF 6 crystal was successfully bonded to sapphire at room temperature, leading to a 3x improvement of the thermal diffusivity compared to bulk crystal. Design of bonded chip for high-power emission is also discussed.
Conference Paper
Thermal resistance between bonded surfaces in composite media fabricated by inter-layer surface activated bonding (il-SAB) is negligible. It indicates 10-W/mK thermal conductivity of YAG can be enhanced over 27.9-W/mK using DFC-PowerChip by il-SAB.
Conference Paper
This study focuses on optimizing bonding strength through temperature annealing and material evaluation for composite chips in J-class laser systems. Valuable insights are provided for maximizing efficiency and performance. 2.7 J output was achieved for two stage amplifier system.
Conference Paper
A compact diode-pumped solid-state laser has been developed, with a modular combination of room-temperature-bonded Nd:YAG ceramic-chips and Sapphire heat sinks as gain medium. The system delivers 2.7J, 800ps pulses with stable operation up to 10Hz.
Conference Paper
In this work 1.6 MW peak power at 266 nm were obtained with 32% power conversion efficiency using YAl 3 (BO 3 ) 4 single crystal to generate the fourth harmonic of a Nd ³⁺ :YAG/Cr ⁴⁺ :YAG microchip laser.
Article
Recently micro-fluidic devices have attracted much attention especially for applications in the biotechnology and chemical engineering. The advantage of microfluidic devices is that fewer biological materials and chemicals are needed for experiments. To achieve high functions in these devices, it is indispensable to equip robust and compact micropu...
Conference Paper
Introduction In 2008, YAl 3 (BO 3 ) 4 (YAB) was reported as new non-hygroscopic material with good d eff (0.63 pm/V) and small walk-off (1.9°) which can be a good alternative to the two commercial crystals: the hygroscopic CsLiB 6 O 10 (CLBO) or to the β-BaB 2 O 4 (BBO; which presents large walk-off) for UV generation at 266 nm [1]. However, until...
Article
Full-text available
In this work we evaluated the laser-induced damage threshold of the interface between two identical YAG crystals, bonded by an inter-layer assisted surface activated bonding method. The experimental results indicate slight damage threshold degradation for both single- and polycrystalline trivalent rear-earth (RE³⁺)-ion-doped YAG gain media in the s...
Conference Paper
We report on a front-end system for a 2 J amplifier setup. It is comprised of an Nd:YAG/Cr:YAG passively Q-switched oscillator and bonded Sapphire/Nd:YAG amplifier setup with a gain aperture effect, all pumped by intense laser diodes.
Conference Paper
We report on gain apertured pre-amplifier system for a microchip laser with beam cleaning stage. Increase in output is expected by use high peak power pump laser diodes both for oscillator and pre-amplifier. In addition, bonded chips for efficient heat removal are incorporated into setup in order to improve overall system performance.
Conference Paper
Multi-stack chips comprised of sapphire and Nd ³⁺ :YAG crystals with variable doping concentration were made by surface activated bonding technology. By use of sophisticated amplification setup >2J operation with nanosecond pulses was obtained under room temperature.
Article
Full-text available
In this work, the performance of Ca5(BO3)3F (CBF) single crystals was investigated for the third harmonic generation at 355 nm. A high energy conversion efficiency of 16.9% at 355 nm was reached using a two-conversion-stage setup. First, using a high peak power, passively Q-switched Nd³⁺:YAG/Cr⁴⁺:YAG microlaser based gain aperture in micro-MOPA, th...
Conference Paper
In this work two multi-crystal stacked chips were made out of bonded Nd3+:YAG and sapphire crystals. By use of two-pass amplification compact setup 2 J at 25 Hz output was obtained. Further optimization of DFC chip is expected to obtain 2 J at 100 Hz repetition rate.
Article
Full-text available
The Distributed Face Cooling (DFC) chip was fabricated from four pieces of 1 mm-length Nd:YAG plate sandwiched in four pieces of sapphire heat spreaders through advanced surface activated bonding (SAB) at room temperature. A sub-nanosecond (665.7ps) pulsed DFC-chip tiny integrated laser was achieved with output energy of 21.5 mJ and peak power of 3...
Article
Full-text available
Shape design of sapphire/Nd³⁺:YAG based distributed face cooling (DFC) chip is reported with reduction of thermal effects as compared with those from a conventional Nd³⁺:YAG chip. The CW diode laser pumped round-trip cavity loss was 0.51% from a 9-disk bonded DFC chip, which was close to the theoretically calculated total Fresnel reflection loss of...
Article
Full-text available
In this work the performance of two yttrium calcium oxyborate (YCOB) crystals made by Czochralski and Bridgman growth process was measured. By using high peak power, passively Q-switched Nd³⁺:YAG/Cr⁴⁺:YAG microlaser, high conversion second harmonic generation efficiency were obtained. Laser pulses at 532 nm with 1.14 mJ energy and 223 ps duration w...
Conference Paper
In this work, we have compared the Q-switched performance of single rod crystal to a newly developed distributed face cooling structure. This structure was made by surface activated bonding technology and allowed to combine transparent heatsink to a gain crystal at room temperature. The Sapphire and Nd³⁺:YAG crystal plates were combined in this fas...
Article
Full-text available
Intense pulse pumped microlaser is proposed for high peak power and low timing jitter at high repetition rate. It is based on Intense and Fast Pulse Pump (IFPP) technique, in which fast pulse pumps up the upper-level population and then dumps it rapidly by Q-switching. That could come close to complete pumping efficiency to reduce thermal problems...
Article
Full-text available
We present a giant-pulse generation laser realized by the emission cross-section control of a gain medium in a passively Q-switched Nd:YVO4 microchip laser with a Cr⁴⁺:YAG saturable absorber. Up to 1.17 MW peak power and 1.03 mJ pulse energy were obtained with a 100 Hz repetition rate. By combining the Nd:YVO4 crystal with a Sapphire plate, lower t...
Conference Paper
5MW green pulse with 70% conversion efficiency was achieved in Bridgman grown YCOB crystal. Also for the first time the temperature tuning in YCOB material is presented with the slope of -0.057%/degC for the range from 30 degC to 220degC.
Conference Paper
In this work a Q-switched Nd:YVO4/Cr4+:YAG laser was developed with the peak power and output energy of 1.17 MW and 1.03 mJ correspondingly. By changing the temperature of Nd:YVO4 crystal control of the emission cross-section σem of the gain medium and thus Q-switch output was possible.
Conference Paper
In this work the repetition rate of passively Q-switched laser was increased up to 1 kHz by the use of Sapphire plate attached to a single Nd:YVO4 crystal. Additional heating of the crystal enabled increase the peak power of the passively Q-switch laser from 21 kW up to 245 kW for a 100 Hz operation and from 37 kW up to 190 kW for 1 kHz operation.
Conference Paper
Output energy of 760 µJ was achieved at 532 nm from a microchip Nd:YAG/CrYAG laser at high pump repetition rate of 1kHz without using focus lens before LBO crystal.
Article
Timing jitter was measured in Nd:YVO4/Cr:YAG passively Q-switched laser. By applying coupled cavity, standard deviation of pulse fluctuations was reduced by 4 times compared to single cavity.
Conference Paper
In this work, emission cross-section dependence on temperature was observed experimentally in passively Q-switched Nd:YVO4/Cr4+:YAG laser. Heating the gain element from 30 °C to 70 °C, the Q-switch pulse energy at 100 Hz QCW pump was increased by three times from 60 μJ to 190 μJ and pulse duration was reduced by 30% from 2.5 ns to 1.8 ns, with peak...
Article
Currently, fabrication of CNT and polymer composites for saturable absorbers is very popular. But due to nature of organic polymer matrix, these composites are unstable on higher temperatures or in high energy light exposition. Therefore a sol-gel process for the fabrication for inorganic (i.e. silica) or semi-organic (organic-modified silica) matr...

Questions

Questions (3)
Question
I would like to ask if somebody has experience of using 3D printed parts in their labs where clean environment is required. I am taking about parts made of PLA or ABS filament.
Question
I am on my way to setup a measurement to estimate thermal lensing in my setup with double pass of a probe beam through the crystal. The only problem is how to interpret the data I will receive. Most of the papers give end-result with little insight on the method. So I would appreciate if someone could recommend me a useful paper/thesis/book which could help to understand it more deeply.
Question
Is there any suggestions for an adequate cleaning solution for the optics with the compressed air. I am currently using the air duster: http://www.engineer.jp/products/clean/cn01/item_05/zc-31.
Is there any alternatives to this one, like from Thorlabs or other companies? Could you provide example.
Thank you!

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