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Average Laser Power

The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Efim A. Khazanov – 1st expert on this subject based on the ideXlab platform

  • Review of Faraday Isolators for Kilowatt Average Power Lasers
    IEEE Journal of Quantum Electronics, 2014
    Co-Authors: Ilya L. Snetkov, Alexander V. Voitovich, Oleg V. Palashov, Efim A. Khazanov

    Abstract:

    Faraday isolators for high Average Power Lasers operating at room temperature are surveyed. Three devices on [001] oriented TGG crystals with the most known optical schemes are considered: traditional scheme, and schemes with compensation of thermally induced depolarization inside magnetic field and outside magnetic field. We report a unique 30-mm-aperture Faraday isolator with thermally induced depolarization compensation inside magnetic field. It provides 33.5-dB isolation ratio at 1.5-kW Average Laser Power.

  • Magnetoactive media for cryogenic Faraday isolators
    Journal of The Optical Society of America B-optical Physics, 2011
    Co-Authors: A. V. Starobor, D. S. Zheleznov, Oleg Palashov, Efim A. Khazanov

    Abstract:

    We analyzed a number of optical media, such as GGG, Nd:YAG, Yb:YAG, fused silica, CaF2, Yb:CaF2, and CdMnTe, that have not been used, to our knowledge, in the cryogenic Faraday isolator (FI) before. The temperature dependence of the Verdet constant and thermo-optical constants was experimentally investigated for λ=1.07 μm. We calculated the magneto-optical figure-of-merit and assessed the feasibility of using FI media with multikilowatt Average Laser Power.

  • Faraday Rotators With Short Magneto-Optical Elements for 50-kW Laser Power
    IEEE Journal of Quantum Electronics, 2007
    Co-Authors: D. S. Zheleznov, Efim A. Khazanov, I.b. Mukhin, Oleg Palashov, A.v. Voitovich

    Abstract:

    Faraday rotators with short magneto-optical elements are created and experimentally studied. The magneto-optical elements are made three to four times shorter either by cooling them to nitrogen temperatures or by increasing the magnetic field. These ways are shown to increase maximum Average Laser Power passing through the Faraday isolators up to 50 kW

Khalil Ibraheem Imhan – 2nd expert on this subject based on the ideXlab platform

  • Laser tube bending process for stainless steel 304
    , 2017
    Co-Authors: Khalil Ibraheem Imhan

    Abstract:

    The invention of the Laser light in the mid-last-century has opened a wide spectrum of
    Laser material processing due to being unique, coherent and monochromatic.
    Moreover, the Laser forming process of materials has a potential feature to produce
    new shapes of sheets or tubes that cannot be achieved through conventional methods.
    In this study, the focus is placed on the Laser tube bending process because of its
    importance in large-term applications. Molds and dies are not currently in use; thus,
    no external forces that can cause tube bending defects such as wrinkling, wall thinning,
    springback and cross-section distortion. In addition, the process is flexible and can be
    controlled by Laser parameters, either individually or in combination with other
    processes. An analytical model is used to study the effect of the Average Laser Power,
    angular scanning speed, Laser beam diameter, and specimen geometry during the Laser
    tube bending process. The material specification impacts on the process behavior are
    analytically investigated for different material such as Copper, Aluminum, Nickel and
    Stainless Steel 304. To verify the analytical results, a high-Power pulsed Neodymiumdoped
    Yttrium Aluminium Garnet (Nd-YAG) Laser of the maximum Laser Power of
    300 (W) emitted at 1064 nm with a fibre-coupled head is used to irradiate stainless
    steel 304 tubes with a 12.7 mm diameter, 0.6 mm thickness. A motorized rotational
    stage with computerized control is used to hold and rotate the specimen tube 180° for
    one semi-circle scanning, with a maximum angular scanning speed of 40 deg/sec. The
    deflection of the tube directly was measured to determine the bending angle, which it
    was 1.33 degrees when the Average Laser Power is 200 W and the angular scanning
    speed is 30 deg/sec. The study also discovered that the Laser softening heat treatment
    on the tube specimens can enhance the material absorption of the Laser light and the
    mechanical formability; hence, the bending angle produced is increased by 70%. The
    experimental results become higher than the analytical results as the Average Laser
    Power exceeds 100 W in both cases, with and without the Laser softening heat
    treatment. Thus, due to the rise of the specimen’s temperature, hence, the analytical
    model is modified and developed to involve the changes of material specifications by
    adding a factor to the model once the Laser Power becomes more than 100 W. This
    behavior may be due to the temperature rise of the tube material from the heat generated by the Laser. The modified model has been tested and optimized by using
    particle swarm optimization (PSO) to find the perfect specifications of the material
    affecting the Laser tube bending process such as thermal expansion coefficient, specific
    heat, yield stress, and absorption coefficient. The analytical and experimental results
    are in the same trend but with different slopes; the bending angle determined is directly
    proportional to the Average Laser Power, and inversely proportional to the angular
    scanning speed. Meanwhile, increasing the tube diameter and thickness reduces the
    value of the bending angle produced. In addition, the material specifications of the
    bent tube have significant effects on the process, especially the expansion coefficient
    which is directly proportional to the bending angle and the density as well as the
    specific heat which are inversely proportional with the bending angle.

  • An Analytical and Experimental Investigation of Average Laser Power and Angular Scanning Speed Effects on Laser Tube Bending Process
    MATEC Web of Conferences, 2017
    Co-Authors: Khalil Ibraheem Imhan, B. T. H. T. Baharudin, Azmi Zakaria, Mohd Idris Shah Ismail, Nasser Mahdi Hadi Alsabti, Ahmad K. Ahmad

    Abstract:

    Laser tube bending is a new technique of Laser material forming to produce a complex and accurate shape due to its flexibility and high controllability. Moreover, the defects during conventional tube forming such as thinning, wrinkling, spring back and ovalization can be avoided in Laser tube bending process, because there is no external force used. In this paper an analytical investigation has been conducted to analyses the effects of Average Laser Power and Laser scanning speed on Laser tube bending process, the analytical results have been verified experimentally. The model used in this study is in the same trend of the experiment. The results show that the bending angle increased with the increasing of Average Laser Power and decreased with the increasing of angular scanning speed.

Alexander Aleksandrov – 3rd expert on this subject based on the ideXlab platform

  • Laser optics development for the Laser assisted H − beam stripping at Spallation Neutron Source
    2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim incorporating the Australasian, 2011
    Co-Authors: Chunning Huang, Alexander Aleksandrov

    Abstract:

    Many Laser applications in high energy physics require an enormous Average Laser Power that is several orders of magnitude higher than what is available from the present Laser technology. This paper reports the development of a macropulse mode Laser system and a Power recycling dual-wavelength optical cavity. The proposed technology has a capability of providing 50 ps/402.5 MHz/1 MW peak Power UV pulses while operating at 1 ms/60 Hz macropulse mode which is required in the Laser assisted hydrogen ion beam stripping for the Spallation Neutron Source.

  • Laser optics development for the Laser assisted H− beam stripping at Spallation Neutron Source
    2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim incorporating the Australasian, 2011
    Co-Authors: Chunning Huang, Alexander Aleksandrov

    Abstract:

    Many Laser applications in high energy physics require an enormous Average Laser Power that is several orders of magnitude higher than what is available from the present Laser technology. This paper reports the development of a macropulse mode Laser system and a Power recycling dual-wavelength optical cavity. The proposed technology has a capability of providing 50 ps/402.5 MHz/1 MW peak Power UV pulses while operating at 1 ms/60 Hz macropulse mode which is required in the Laser assisted hydrogen ion beam stripping for the Spallation Neutron Source.