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We report on high-power operation of a widely tunable dual-wavelength Tm:fiber laser in the 2 microm spectral region using volume Bragg gratings and a simple resonator configuration for wavelength selection. The wavelength splitting range is continuously tunable from 1 to 50 nm (0.1-3.8 THz), with >115 W of diffraction-limited total output power for(More)
Efficient operation of a cladding pumped high power Tm: fiber laser with a volume Bragg grating (VBG) as wavelength selective and spectrally narrowing element is reported. The laser yielded over 112 W of diffraction limited output at 1988 nm with a spectral linewidth of ~12 pm for 279 W of launched pump power, corresponding to a slope efficiency with(More)
As a new kind of optically pumped gaseous lasers, diode pumped metastable rare gas lasers (OPRGLs) show potential in high power operation. In this paper, a multi-level rate equation based model of OPRGL is established. A qualitative agreement between simulation and Rawlins et al.'s experimental result shows the validity of the model. The key parameters'(More)
We demonstrate a temperature sensor based on surface plasmon resonances supported by photonic crystal fibers (PCFs). Within the PCF, to enhance the sensitivity of the sensor, the air holes of the second layer are filled with a large thermo-optic coefficient liquid and some of those air holes are selectively coated with metal. Temperature variations will(More)
A compact temperature sensor based on a selectively liquid-filled photonic crystal fiber (PCF) is proposed using controlled hole collapse in PCF post-processing. The first ring around the core is filled with liquid of higher refractive index than the matrix, while the outer rings of holes are filled with air. The bandgap (BG)-like effect of the high(More)
A 1.8 to 4.2 &#x00B5;m high-mode mid-infrared supercontinuum (SC) is presented in an all-fiber chalcogenide-based system. In this experiment, 3-m-long step-index As<inf>2</inf>S<inf>3</inf> fiber with a core diameter of 9 &#x00B5;m is fusion spliced with a piece of ultra-high numerical aperture fiber, achieving a low splicing loss of about 0.2 dB. When a(More)
A supercontinuum (SC) source spanning from 2 to 4 μm is demonstrated in As<sub>2</sub>S<sub>3</sub>-chalcogenide fibers pumped by a nanosecond supercontinuum pump source in the normal dispersion region. In this experiment, two pieces of 3-m-long step-index As<sub>2</sub>S<sub>3</sub> fiber with different core diameters of 7 μm and 9 μm are pumped by a(More)
We develop an analytic model to describe the dynamic average thermal distortion and phase difference between the two principal polarizations in side-pumped Nd:YAG and Nd:glass heat capacity rod lasers. It can be predicted that the average thermal distortion is proportional to the temperature profile on the cross section from the analytic expression and,(More)
By pumping a 1.7-m-long As<sub>2</sub>S<sub>3</sub> fiber at 2050 nm directly, a fiber-based mid-infrared supercontinuum (SC) source with an output power of 366 mW is demonstrated. This is the first experimental demonstration to obtain such a mid-infrared SC in a piece of chalcogenide fiber pumped at 2 μm directly. The cut-off wavelength of the(More)
A Shack-Hartmann sensor nonintrusive measurement for the temperature profile in a heat-capacity neodymium-doped glass rod is proposed. This technique is possible because the optical path length of the rod changes with temperature linearly over a wide range. The temperature change of the solid-state laser rod is often recorded by using a thermocouple,(More)