Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

Thermal tuning of volume Bragg gratings for high power spectral beam combining

[+] Author Affiliations
Derrek R. Drachenberg, Oleksiy Andrusyak, Ivan Divliansky, Alexei Podvyaznyy, George B. Venus, Leonid B. Glebov

CREOL, The College of Optics and Photonics, Univ. of Central Florida (USA)

Ion Cohanoschi

OptiGrate Corp. (USA)

Oleksiy Mokhun, Vadim Smirnov

Optigrate Corp. (USA)

Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801U (February 17, 2010); doi:10.1117/12.845951
Text Size: A A A
From Conference Volume 7580

  • Fiber Lasers VII: Technology, Systems, and Applications
  • Kanishka Tankala
  • San Francisco, California, USA | January 23, 2010

abstract

A tabletop kW-level spectral beam combining (SBC) system using volume Bragg gratings (VBGs) recorded in photothermo- refractive (PTR) glass was presented at the last meeting [1]. Diffraction efficiency of VBGs close to 100% was demonstrated. However, when using VBGs for spectral beam combining, it is important to ensure high diffraction efficiency for the diffracted beam and low diffraction efficiency for the transmitted beams simultaneously. The unique, unmatched properties of VBGs allow spectral beam combining achieving this condition at wavelengths with less than 0.25 nm separation. We present modeling of reflecting VBGs for high power SBC that takes into account laser spectral bandwidth, beam divergence, PTR-glass scattering losses, and grating non-uniformity. A method for optimization of VBG parameters for high-efficiency SBC with an arbitrary number of channels is developed. Another important aspect of spectral beam combiner design is maintaining high diffraction efficiency as the temperature of beam-combining VBGs changes during operation due to absorption of high power radiation. A new technique of thermal tuning of large aperture VBGs, designed to maintain high efficiency of beam combining without mechanical adjustment over a wide range of laser power, is developed. Finally, these tools are used to demonstrate a robust and portable 5-channel SBC system with near diffraction limited spectrally-combined output beam.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Derrek R. Drachenberg ; Oleksiy Andrusyak ; Ion Cohanoschi ; Ivan Divliansky ; Oleksiy Mokhun, et al.
"Thermal tuning of volume Bragg gratings for high power spectral beam combining", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801U (February 17, 2010); doi:10.1117/12.845951; http://dx.doi.org/10.1117/12.845951


Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement

 

 

  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.