4 May 1999 Diode-pumped high-power cw all solid state laser at 266 nm
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Abstract
The first cw high-power UV laser at 266 nm--DELTATRAIN--is accomplished by frequency doubling the 532 nm output of a diode-pumped Nd:YAG laser with an actively stabilized unidirectional ring cavity based on the novel DELTACONCEPT, where a minimum number of optical components--two mirrors and one prism are used. The symmetrical Brewster-angled beam path through the prism guarantees minimum losses and hence maximum power enhancement and efficiency. The cavity length control is done by moving the prism along its symmetry axis using a piezoelectric element. The beam path in the cavity remains not only completely unaffected during this movement but also unaffected in the first order by small tilts of the prism due to possible imperfection of the piezoelectric element. Furthermore, the stabilization loop has excellent dynamic behavior owing to the small mass of the prism. The name of this concept results from the (Delta) -geometrical configuration of this novel ring resonator. The unique feature of the DELTACONCEPT shown above adopted in the DELTATRAIN results in long term UV power stability, high beam pointing stability, excellent beam profile and reduced effort in alignment. By using Brewster-cut BBO crystals the high-power cw UV laser can deliver 266 nm radiation with an output power of 1.4 Watt at a green pumping power of 5 W.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ekhard Zanger, Ralf Mueller, Baining Liu, Michael Koetteritzsch, Wolfgang Gries, "Diode-pumped high-power cw all solid state laser at 266 nm", Proc. SPIE 3613, Solid State Lasers VIII, (4 May 1999); doi: 10.1117/12.347696; https://doi.org/10.1117/12.347696
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