Spectral beam combining of fiber lasers with increased channel density

Oleksiy Andrusyak; Igor Ciapurin; Vadim Smirnov; George Venus; Leonid Glebov

doi:10.1117/12.712602

21 February 2007 Spectral beam combining of fiber lasers with increased channel density

Oleksiy Andrusyak, Igor Ciapurin, Vadim Smirnov, George Venus, Leonid Glebov

Proceedings Volume 6453, Fiber Lasers IV: Technology, Systems, and Applications; 64531L (2007) https://doi.org/10.1117/12.712602
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

Abstract

Incoherent spectral beam combining (SBC) by means of volume Bragg gratings (VBGs) has been shown to be a simple and robust technique for generating high-power laser radiation. Combination of laser radiation from multiple sources into a single near-diffraction-limited beam results in energy brightness increase, while spectral brightness is preserved. High-efficiency VBG recording in photo-thermo-refractive (PTR) glass has been recently developed. While being photosensitive in the UV, PTR glass offers high transmittance in the near-IR and visible parts of spectrum. Moreover, this glass has excellent mechanical properties and refractive index independent of temperature. These features enable VBGs in PTR glass to withstand high-power laser radiation, making them ideal elements for high-power SBC. We present experimental results of successful 5-channel SBC with reflecting VBGs in PTR glass with small channel spacing (~0.43 nm around 1064 nm). Absolute system efficiency of 93.5% is demonstrated. Combined beam is shown to be near-diffraction-limited with M²=1.11. Behavior of narrow-band reflecting VBGs in high-power beams is studied. VBGs are shown to withstand 570 W CW radiation around 1064 nm with diffraction efficiency in excess of 92%. Pathway to near-diffraction-limited high-power laser systems via SBC with VBGs is shown. High-efficiency SBC system with 0.2 nm channel spacing is designed.

Citation Download Citation

Oleksiy Andrusyak, Igor Ciapurin, Vadim Smirnov, George Venus, and Leonid Glebov "Spectral beam combining of fiber lasers with increased channel density", Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 64531L (21 February 2007); https://doi.org/10.1117/12.712602

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available