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12 September 2017 Compact sources for eyesafe illumination
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Abstract
Q-peak has demonstrated a compact, pulsed eyesafe laser architecture operating with <10  mJ pulse energies at repetition rates as high as 160 Hz. The design leverages an end-pumped solid-state laser geometry to produce adequate eyesafe beam quality (M2∼4), while also providing a path toward higher-density laser architectures for pulsed eyesafe applications. The baseline discussed in this paper has shown a unique capability for high-pulse repetition rates in a compact package, and offers additional potential for power scaling based on birefringence compensation. The laser consists of an actively Q-switched oscillator cavity producing pulse widths <30  ns, and utilizing an end-pumped Nd:YAG gain medium with a rubidium titanyl phosphate electro-optical crystal. The oscillator provides an effective front-end-seed for an optical parametric oscillator (OPO), which utilizes potassium titanyl arsenate in a linear OPO geometry. This laser efficiently operates in the eyesafe band, and has been designed to fit within a volume of 3760  cm3. We will discuss details of the optical system design, modeled thermal effects and stress-induced birefringence, as well as experimental advantages of the end-pumped laser geometry, along with proposed paths to higher eyesafe pulse energies.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2017/$25.00 © 2017 SPIE
Nadia Baranova, Rui Pu, Kenneth Stebbins, Ilya Bystryak, Michael Rayno, Kevin Ezzo, and Christopher DePriest "Compact sources for eyesafe illumination," Optical Engineering 57(2), 021202 (12 September 2017). https://doi.org/10.1117/1.OE.57.2.021202
Received: 1 May 2017; Accepted: 22 August 2017; Published: 12 September 2017
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