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Accession Number:
ADA564679
Title:
Holmium Doped Solid State Laser Resonantly Pumped and Q-Switched by Novel GaSb-Based Photonic Devices
Descriptive Note:
Final rept. 1 Mar 2008-31 May 2011
Corporate Author:
STATE UNIV OF NEW YORK AT STONY BROOK
Report Date:
2011-08-31
Pagination or Media Count:
22.0
Abstract:
A highly efficient Ho3-doped fluoride glass fiber laser operating at 2.08 m is demonstrated using nearly resonant pumping at 1.94 m by GaSb-based diode lasers. A maximum slope efficiency of 78 and output power above 500 mW were obtained. Asymmetric laser heterostructure was developed to improve beam properties of GaSb-based diode lasers. Multimode 100- m-wide ridge waveguide lasers with 40 degrees fast axis beam divergence demonstrated output power of about 1.5 W CW at 20 C. High-power 2.2 m broadened waveguide diode lasers demonstrate internal optical loss below 4 cm-1, threshold current density below 100 Acm2 and CW output power of 1.6 W. Linear laser arrays generated above 25 W of quasi-CW output power. The device power conversion efficiencies were better than 20 in peak and above 10 at maximum output power level. Diode lasers operating at 2.7 m with room-temperature CW output power of 600 mW and peak power-conversion efficiency of 10 were demonstrated. Ridge waveguide diode lasers operating in the spectral region near 3.15 m demonstrated single spatial mode CW output power of 9 mW at 20 C and operated up to 40 C in CW regime.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
