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Barnes N.P.,NASA | Amzajerdian F.,NASA | Reichle D.J.,NASA | Carrion W.A.,Coherent Applications, Inc. | And 2 more authors.
Applied Physics B: Lasers and Optics | Year: 2011

Direct diode pumped Ho:YAG generated laser pulses at 2.12 μm with an optical to optical slope efficiency of 0.24. Ho:YAG and Ho:LuAG laser rods were evaluated with both wide and narrow bandwidth pump diodes. The laser wavelength varies with the level of pumping and optical design. This variation was found to be predictable. Second harmonic at 1.06 μm was produced in a 6.0 mm long BBO crystal. © US Government 2010.

Fox B.P.,University of Arizona | Simmons-Potter K.,University of Arizona | Kliner D.A.V.,NLight | Moore S.W.,Sandia National Laboratories
Journal of Non-Crystalline Solids | Year: 2013

The implementation of optical systems, based on rare-earth doped fibers, in space environments adds a powerful new dimension of functionality to the design of space-based systems, particularly when high power and bandwidth, high fidelity, and low susceptibility to electromagnetic interference are desired. As these specialty fibers are often the most sensitive components of an optical system, extensive use requires considerable insight into the ionizing-radiation-induced changes experienced by the fibers during their operational lifetime. In this research, a suite of aluminosilicate fibers singly or co-doped with erbium and ytterbium ions was deployed into low-Earth orbit for approximately 18 months as part of the Materials International Space Station Experiment (MISSE) 7 mission. Optical spectroscopy performed on the retrieved fibers is compared to control data from pristine, unirradiated fibers, revealing colorcenter generation in the visible portion of the spectrum consistent with silica-related and aluminum-related absorption centers, with band-tailing into the near-infrared. Results suggest that visible to near infra-red (NIR) absorption experienced by the co-doped fiber is less-pronounced than in its singly-doped counterparts, likely a result of the lower aluminum concentration of this fiber. The data were also compared to data from terrestrial 60Co irradiation of the same fiber types and it was found that the overall trends observed in the space-irradiated fibers in the near-infrared were accurately, although not identically, reproduced. The resultant information is important for the design and testing of radiation-hardened optical-fiber-based laser and amplifier systems. © 2013 Published by Elsevier B.V.

Hu I.-N.,University of Michigan | Zhu C.,University of Michigan | Haines M.,University of Michigan | McComb T.S.,NLight | And 3 more authors.
CLEO: QELS - Fundamental Science, CLEO_QELS 2015 | Year: 2015

Study of nonlinear, intensity-dependent polarization evolution in 55μm core polygonal- CCC fibers reveals that both nonlinear polarization switching as well as robust and intensityindependent polarization maintenance can be achieved depending on input signal polarization. © OSA 2015.

Atchley M.,NLight | Martinsen R.,NLight | Price K.,NLight
Laser Focus World | Year: 2013

Properly optimized volume Bragg grating (VBG)-based upper-state laser diode pumping leads to performance and power improvements for diodepumped solid-state (DPSS) lasers. Historically, the industrial workhorse of DPSS lasers has been neodymium:yttrium aluminum garnet (Nd: YAG) pumped at 808 nm due to the large absorption cross section, broad absorption line width, and good thermal properties of the host crystal. The improvements in output power, beam quality, and output polarization gained by using vanadate based crystals place tight specifications on the laser diode pumps. Since vanadate crystals are naturally birefringent, the upper state absorption line width is narrow and strongly polarization dependent, forcing tight specifications on spectral width and wavelength emission stability over varying operating temperatures and operating currents for high-power laser diode pump sources.

Price K.,NLight | Karlsen S.,NLight | Leisher P.,NLight | Martinsen R.,NLight
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

We report on the continued development of high brightness laser diode modules at nLIGHT Photonics. These modules, based on nLIGHT's Pearl© product platform, demonstrate excellence in output power, brightness, wavelength stabilization, and long wavelength performance. This system, based on 14 single emitters, is designed to couple diode laser light into a 105 μm fiber at an excitation NA of under 0.14. We demonstrate over 100W of optical power at 9xx nm with a diode brightness exceeding 20 MW/cm2-str with an operating efficiency of approximately 50%. Additional results show over 70W of optical coupled at 8xx nm. Record brilliance at wavelengths 14xx nm and longer will also be demonstrated, with over 15 W of optical power with a beam quality of 7.5 mm-mrad. These results of high brightness, high efficiency, and wavelength stabilization demonstrate the pump technology required for next generation solid state and fiber lasers. © 2010 Copyright SPIE - The International Society for Optical Engineering.

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