Dr. Yehoshua Shimony Profile

KEYWORDS: Solar energy, Semiconductor lasers, Q switches, Laser applications, Oscillators, Mirrors, Nd:YAG lasers, Alexandrite lasers, Solar concentrators, Optical amplifiers

Read Abstract +

Proceedings Article | 22 September 1997 Paper

Performance of passive Q-switched, solar-pumped, high-power Nd:YAG lasers

Yoram Noter, Nir Naftali, Idit Pe'er, Amnon Yogev, Mordechai Lando, Yehoshua Shimony

Proceedings Volume 3110, (1997) https://doi.org/10.1117/12.281360

KEYWORDS: Compound parabolic concentrators, Q switches, Nd:YAG lasers, Rod lasers, High power lasers, Q switched lasers, Crystals, Reflectivity, Mirrors, Laser resonators

Read Abstract +

Q-switched, solar-pumped, high power Nd:YAG lasers are attractive for a variety of applications requiring high instantaneous peak power density. The Q-switching can be obtained by an acousto-optic, electro-optic or passive device. Passive Q-switching seems an excellent choice for space as well as for other applications since it neither requires an external driver nor an electrical power supply. In recent years Cr⁺⁴:YAG single crystals were extensively used as passive Q-switches for flashlamp-pumped high power Nd:YAG lasers, demonstrating their superior thermal superior thermal characteristics and durability. In this work we report the first operation of passive Q- switched, solar-pumped, high power Nd:YAG lasers. The concentrated solar energy for he optical pumping of the laser was obtained by a 3-stage combination of imaging and non-imaging optics. It included: i) Weizmann Institute solar tower heliostats, ii) 3D compound parabolic concentrator, and iii) 2D compound parabolic concentrator in which the laser rod was placed. 72 mm long laser rods with either 3 mm or 4 mm diameter were used. The passive Q-switch was made from a Cr$=+4):YAG single crystal having a low- intensity transmission of 72 percent at 1.06 (mu) . Its rear surface was coated by a high reflectivity coating, serving as the rear mirror of the cavity. Output coupling mirrors with various reflectivities were used. The passive Q-switch demonstrated excellent durability and reliability during all the experiments. Repetition rates of 6-39 kHz were measured, showing higher repetition rates at higher laser power levels. The pulses demonstrated shorter full width at half maximum (FWHM) time for higher laser power elves, and the FWHM time range was 190-310 nsec. The maximal measured average power was 14 W. Thermal lensing was measured as a function of the absorbed solar power in the laser rod. It is estimated that laser peak power densities of approximately 100 kW/cm² were achieved in the experiments. It is believed that near-future modifications may improve this value appreciably.

Proceedings Article | 22 September 1997 Paper

Intracavity second harmonic generation in passively Q-switched Nd:YAG laser

Shaul Pearl, Yehoshua Shimony, Haim Lotem, Michael Roth, Nahum Angert

Proceedings Volume 3110, (1997) https://doi.org/10.1117/12.281337

KEYWORDS: Mirrors, Nonlinear crystals, Harmonic generation, Crystals, Acousto-optics, Ferroelectric materials, Nd:YAG lasers, Q switching, Q switches, Q switched lasers

Read Abstract +

Proceedings Article | 25 March 1996 Paper

Cr4+-doped garnets: their properties as laser materials and nonlinear absorbers

Yehoshua Kalisky, Andrei Ben-Amar Baranga, Yehoshua Shimony, Zeev Burshtein, S. Pollack, Milan Kokta

Proceedings Volume 2698, (1996) https://doi.org/10.1117/12.236150

KEYWORDS: Garnet, Absorption, YAG lasers, Q switching, Nd:YAG lasers, Q switched lasers, Q switches, Crystals, Q switch crystals, Chromium

Read Abstract +

Proceedings Article | 13 August 1993 Paper

Cr4+ doped crystals for laser applications

Yehoshua Shimony

Proceedings Volume 1972, (1993) https://doi.org/10.1117/12.151087

KEYWORDS: Crystals, Chromium, Ions, Laser crystals, YAG lasers, Laser applications, Nd:YAG lasers, Optical engineering, Solids, Tunable lasers

Read Abstract +

Proceedings Article | 21 July 1993 Paper

Growth and characterization of pure Cr; Cr,Er and Cr,Ho codoped Y2SiO5

G. Loutts, S. Hirnak, Tasoltan Basiev, M. Doroshenko, Valery Sigachev, Yehoshua Shimony, Chiranjit Deka, Xin Zhang, Antonio G. J. Villaverde, Michael Bass, Bruce Chai

Proceedings Volume 1863, (1993) https://doi.org/10.1117/12.149263

KEYWORDS: Chromium, Ions, Luminescence, Crystals, Erbium, Holmium, Energy transfer, Absorption, Yttrium, Spectroscopy

Read Abstract +

Showing 5 of 10 publications

Conference Committee Involvement (5)

Laser Sources and Applications

16 April 2012 | Brussels, Belgium

Solid State Lasers and Amplifiers

12 April 2010 | Brussels, Belgium

Solid State Lasers and Amplifiers

8 April 2008 | Strasbourg, France

Solid State Lasers and Amplifiers II

5 April 2006 | Strasbourg, France

Solid State Lasers and Amplifiers

27 April 2004 | Strasbourg, France

Keywords/Phrases

Search In:

Publication Years