Vancouver, WA, United States
Vancouver, WA, United States
Time filter
Source Type

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.

Kennedy K.,NLIGHT | Hemenway M.,NLIGHT | Urbanek W.,NLIGHT | Hoener K.,NLIGHT | And 5 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Advances in high performance fiber coupled diode lasers continue to enable new applications as well as strengthen existing uses through progressive improvements in power and brightness [1]. These improvements are most notable in multi-kW direct diode systems and kW fiber laser platforms that effectively transform better beam quality into superior system performance and in DPSS (Diode pumped solid state) application striving to scale TEM00 (fundamental transverse mode) power. We report on our recent single-emitter based fiber-coupled product platform, the elementTM, that addressed these applications at 8xx/9xx nm with optical powers over 200W in a range of fiber core sizes down to 105um and 0.14NA (Numerical Aperture). The product is a culmination of numerous packaging improvements: improving wall plug efficiencies (~50% electrical-to-optical) while improving volume manufacturability, enabling lower costs, improving usable chip brightness by, < 20% over previous generation chips, and increasing the reliable output power to 15W per chip. We additionally report on current developments to extend the power of the product platform to as high as 300W. This will be realized primarily through new chip architectures projected to further increase the useable chip brightness by an additional 20 % and correspondingly scaling reliable output powers. Second order improvements are proposed in packaging enhancements that capitalize on the increased chip power and brightness as well as expand the package's thermal capabilities. Finally, an extended performance roadmap will translate expected power advances and increasing volumes into a projection of relative $/W decreases over the next several years. © 2014 SPIE.

Hemenway M.,NLIGHT | Urbanek W.,NLIGHT | Hoener K.,NLIGHT | Kennedy K.W.,NLIGHT | And 10 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

High-power, high-brightness, fiber-coupled pump modules enable high-performance industrial fiber lasers with simple system architectures, multi-kW output powers, excellent beam quality, unsurpassed reliability, and low initial and operating costs. We report commercially available (element™), single-emitter-based, 9xx nm pump sources with powers up to 130 W in a 105 μm fiber and 250 W in a 200 μm fiber. This combination of high power and high brightness translates into improved fiber laser performance, e.g., simultaneously achieving high nonlinear thresholds and excellent beam quality at kW power levels. Wavelength-stabilized, 976 nm versions of these pumps are available for applications requiring minimization of the gain-fiber length (e.g., generation of high-peak-power pulses). Recent prototypes have achieved output powers up to 300 W in a 200 μm fiber. Extensive environmental and life testing at both the chip and module level under accelerated and real-world operating conditions have demonstrated extremely high reliability, with innovative designs having eliminated package-induced-failure mechanisms. Finally, we report integrated Pump Modules that provide < 1.6 kW of fiber-coupled power conveniently formatted for fiber-laser pumping or direct-diode applications; these 19″ rack-mountable, 2U units combine the outputs of up to 14 elements™ using fused-fiber combiners, and they include high-efficiency diode drivers and safety sensors. © 2014 SPIE.

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.

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.

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

Direct semiconductor diode laser-based systems have emerged as the preferred tool to address a wide range of material processing, solid-state and fiber laser pumping, and various military applications. We present an architectural framework and prototype results for kW-class laser tools based on single emitters that addresses a range of output powers (500W to multiple kW) and beam parameter products (20 to 100 mm-mrad) in a system with an operating efficiency near 50%. nLIGHT uses a variety of building blocks for these systems: a 100W, 105um, 0.14 NA pump module at 9xx nm; a 600W, 30 mm-mrad single wavelength, single polarization building block source; and a 140 W 20 mm-mrad low-cost module. The building block is selected to realize the brightness and cost targets necessary for the application. We also show how efficiency and reliability can be engineered to minimize operating and service costs while maximizing system up-time. Additionally we show the flexibility of this system by demonstrating systems at 8xx, 9xx, and 15xx nm. Finally, we investigate the diode reliability, FIT rate requirements, and package impact on system reliability. © 2010 Copyright SPIE - The International Society for Optical Engineering.

McComb T.S.,NLIGHT | Koponen J.J.,NLIGHT | Martinsen R.J.,NLIGHT | Atchley M.,NLIGHT
Laser Focus World | Year: 2014

Chirally coupled core (3C) optical fibers allow large-mode areas, near-diffraction-limited beam quality, and effectively zero modal pointing, owing to designed-in higher-order-mode (HOM) suppression. Several state-of-the-art LMA fiber types enable high-peak-power performance by scaling mode area to increase the threshold for the onset of nonlinear effects, but often these technologies struggle to meet the most demanding beam quality parameters over long system lifetimes. The pitch of the helix period can create a quasi-phase-matching condition between the modes of the main core and those of the satellite core where strong coupling between the two occurs. The net effect of high-gain operation and the slight bend-induced and fiber-structure-induced background losses are the cause for the lower-than- quantum-defect-limited amplifier performance.

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.

Leisher P.,nLIGHT | Brown A.,nLIGHT | Martinsen R.,nLIGHT | Haden J.,nLIGHT | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

Spectrally-narrowed semiconductor laser diodes utilizing external volume gratings can be used to improve TEM00 power scaling and power conversion efficiency in diode-pumped solid state and fiber lasers. This approach is particularly attractive for pumping the narrow upper laser level of Nd:YAG DPSS lasers at 885 nm and the 1532 nm absorption band of Er:YAG DPSS lasers. While it is often believed that the use of such external gratings to wavelength lock diode lasers lead to unavoidable losses in power and efficiency, nLIGHT's proprietary laser designs and external volume grating integration techniques have eliminated these losses in our wavelength-locked diode laser products, enabling a broad range of spectrally locked laser diodes for pumping DPSS as well as fiber laser systems.

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.

Loading NLight collaborators
Loading NLight collaborators