High power conversion efficiency and wavelength-stabilized narrow bandwidth 975nm diode laser pumps

M. Kanskar; J. Cai; C. Galstad; Y. He; S. H Macomber; E. Stiers; S. R. Tatavarti-Bharatam; D. Botez; L. J. Mawst

doi:10.1117/12.669036

12 May 2006 High power conversion efficiency and wavelength-stabilized narrow bandwidth 975nm diode laser pumps

M. Kanskar, J. Cai, C. Galstad, Y. He, S. H Macomber, E. Stiers, S. R. Tatavarti-Bharatam, D. Botez, L. J. Mawst

Proceedings Volume 6216, Laser Source and System Technology for Defense and Security II; 621609 (2006) https://doi.org/10.1117/12.669036
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

We report on improvement from 50% to 70% power conversion efficiency on a 5-bar stack with 500 W of CW power at 25C coolant temperature resulting from a multi-pronged optimization approach. We also report on wavelength stabilization (0.07 nm/C) and emission bandwidth narrowing (0.3 nm at FWHM) of diode laser pump sources for precision pumping the upper transition levels of lasers that require narrow and stable pump sources such as Er/Yb co-doped or Yb:YAG lasers. These results have been achieved by integration of a Bragg grating inside a semiconductor laser cavity forming a low-loss, weak distributed feedback (DFB) laser, which results in record 53% wall-plug efficiency at 3 W CW operation and 25°C heatsink temperature from a 100-μm aperture diode laser and 45 W of wavelength-locked CW power from a 20% fill factor bar. This technique can be readily applied to diode laser structures for other strategic pump wavelengths.

Citation Download Citation

M. Kanskar, J. Cai, C. Galstad, Y. He, S. H Macomber, E. Stiers, S. R. Tatavarti-Bharatam, D. Botez, and L. J. Mawst "High power conversion efficiency and wavelength-stabilized narrow bandwidth 975nm diode laser pumps", Proc. SPIE 6216, Laser Source and System Technology for Defense and Security II, 621609 (12 May 2006); https://doi.org/10.1117/12.669036

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