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Proceedings Paper

Novel technique for combining of diode pumps to solid state materials
Author(s): Raphael Lavi; Sagie Tsadka; Steven M. Jackel; Raphael Lallouz
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Paper Abstract

A new technique for combining two diode laser beams to a laser rod is demonstrated. By taking advantage of the two absorption peaks of Nd:YAG around 795 and 809 nm, and of Nd:YLF around 794 and 807 nm, a dichroic mirror was used as the combining element of two diode lasers lasing at different wavelength at room temperature. Using an end-pumped geometry, an oscillator pumped by two 2 W diode lasers (SDL - 2372-P1) was built. In the free-running mode of operation, total light to light conversion efficiencies of 26%, 29%, and 31.5% with 0.31, 0.32, and 0.35 slope efficiencies were achieved for Nd:YAG pumping with the 795 nm, 809 nm and the two diodes together (with a total of 4 W), respectively. In the case of the free-running Nd:YLF the total light to light conversion efficiencies were 33%, 26%, and 31% with 0.41, 0.33, and 0.36 slope efficiencies, for the same pumping situations. For q-switched operation and pump pulse width duration of approximately 1 fluorescence lifetime the Nd:YAG efficiencies were 10%, 11%, and 13%, and for Nd:YLF 11.5%, 10%, and 10.5%, for the same pumping cases. Using this coupling scheme the output of the laser was effectively doubled. The beam quality was approximately 1.1 diffraction limited in all cases. This technique is suitable for pumping other lasing materials such as Nd:YVO4 and Nd:BEL around 800 nm, and Cr:LiSrAlF6 around 680 nm.

Paper Details

Date Published: 6 June 1995
PDF: 8 pages
Proc. SPIE 2426, 9th Meeting on Optical Engineering in Israel, (6 June 1995); doi: 10.1117/12.211232
Show Author Affiliations
Raphael Lavi, Soreq Nuclear Research Ctr. (Israel)
Sagie Tsadka, Soreq Nuclear Research Ctr. (Israel)
Steven M. Jackel, Soreq Nuclear Research Ctr. (Israel)
Raphael Lallouz, Soreq Nuclear Research Ctr. (Israel)


Published in SPIE Proceedings Vol. 2426:
9th Meeting on Optical Engineering in Israel
Itzhak Shladov; Yitzhak Wiessman; Natan Kopeika, Editor(s)

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