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Proceedings Paper

High brightness sub-nanosecond Q-switched laser using volume Bragg gratings
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Paper Abstract

The design of Q-switched lasers capable of producing pulse widths of 100’s of picoseconds necessitates the cavity length be shorter than a few centimeters. Increasing the amount of energy extracted per pulse requires increasing the mode area of the resonator that for the same cavity length causes exciting higher order transverse modes and decreasing the brightness of the output radiation. To suppress the higher order modes of these multimode resonators while maintaining the compact cavity requires the use of intra-cavity angular filters. A novel Q-switched laser design is presented using transmitting Bragg gratings (TBGs) as angular filters to suppress the higher order transverse modes. The laser consists of a 5 mm thick slab of Nd:YAG, a 3 mm thick slab of Cr:YAG with a 20% transmission, one TBG aligned to suppress the higher order modes along the x-axis, and a 40% output coupler. The gratings are recorded in photo-thermo-refractive (PTR) glass, which has a high damage threshold that can withstand both the high peak powers and high average powers present within the resonator. Using a 4.1 mrad TBG in a 10.8 mm long resonator with an 800μm x 400 μm pump beam, a nearly diffraction limited beam quality of M2 = 1.3 is obtained in a 0.76 mJ pulse with a pulse width of 614 ps.

Paper Details

Date Published: 16 March 2016
PDF: 6 pages
Proc. SPIE 9726, Solid State Lasers XXV: Technology and Devices, 97261W (16 March 2016); doi: 10.1117/12.2212660
Show Author Affiliations
Brian M. Anderson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Evan Hale, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
George Venus, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Daniel Ott, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Ivan Divliansky, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Leonid Glebov, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 9726:
Solid State Lasers XXV: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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