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Design and Performance of a High-Power, Diode-Pumped 2.1 μm Tm,Ho:YAG Laser

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Abstract

In this paper we describe the latest developments in the design and operation of a high average power, diode-pumped, 2.1 μm laser. We have designed and tested a Tm,Ho:YAG resonator which utilizes direct transverse pumping of the Tm using high-power, quasi-CW, 785 nm laser diode arrays. Each array is impingement cooled, and consists of a three bar stack which emits a total of 180 W of peak power. These diodes are each 1 cm in length and are mounted in a seven-fold symmetry and butt-coupled around a cooling jacket which surrounds a 3mmϕ × 33mmL Tm:Ho:YAG laser rod. A mixture of water and methanol flows between the cooling jacket and the laser rod to provide a means of extracting the excess heat. The laser resonator is illustrated in Figure 1 and consists of two laser rods, each of which is 33 mm in length.

© 1993 Optical Society of America

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