We report on testing of an edge-pumped ceramic Yb:YAG disk laser having a tailored spatial gain profile for preferential amplification of the TEM00 mode. The disk has a composite construction with a Yb-doped large-aperture central portion cosintered with an undoped perimetral edge. Light from multi-kW diodes is transported though the disk edge and absorbed in the Yb-doped center. This configuration makes it poss¬ible to conveniently arrange the diode light and produce a spatially flat gain profile, such as is desir¬able for the amplification of a spatial flat top beam or a tailored gain profile . Amplified spontan¬eous emis¬sion (ASE) and parasitic lasing is mitigated by the geometry of the laser disk edge, which is designed to efficiently outcouple laser fluorescence .
This work experimentally investigated the tailored spatial gain profile and the lasing performance of TEM00 mode (Gaussian spatial profile) beam without the distorting effects of gain saturation. Compari¬son of the lasing performance of a flat spatial gain to that with tailored gain is presented. This work was supported in-part by the US Department of Energy grants DE-SC0013762 and DE-SC0015834.
1. Drew A. Copeland and John Vetrovec, “Gain Tailoring Model and Improved Optical Extraction
in CW Edge–Pumped Disk Amplifiers,” SPIE Vol. 8235, 82350U (2012).
2. John Vetrovec, Drew A. Copeland, Amardeep S. Litt, Suraj J. Thiagarajan, and Eldridge Briscoe "Stored Energy and Gain in an Edge-Pumped Ceramic Yb:YAG Disk Laser under Intense Pumping," SPIE Vol. 10084, 1008407 (2017).
John Vetrovec, Drew A. Copeland, Amardeep S. Litt, David M. Filgas, and Eldridge Briscoe, "Lasing performance of an edge-pumped ceramic Yb:YAG disk laser with a tailored spatial gain profile (Conference Presentation)," Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105110O (Presented at SPIE LASE: January 30, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2291387.5751367198001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon