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The atmospheric profiling of water vapor is necessary for finding life on Mars and weather on Earth. The design and performance of a water vapor lidar based on a Tm:germanate fiber laser is presented.
We demonstrate robustly single-mode power scaling in fiber laser systems built using 35-mum core Yb-doped double-clad chirally-coupled-core (CCC) fibers. Up to 250 W have been demonstrated up to date and further power scaling is in progress.
A new model of auto-oscillations in high concentration erbium doped fiber laser has been developed with accounting for statistical nature of the excitation migration and upconversion, as well as resonance-like pump-to-signal intensity noise transfer.
We propose and analyze coupled fiber lasers based on Raman gain. The nonlinear phases inherent in the stimulated Raman scattering process are shown to contribute to the phase locking mechanism in the weak coupling regime.
Using wavelengths between 2.6 and 3.8 microns from a fiber-based supercontinuum laser, lipids and proteins can be identified and selectively ablated. Absorption spectroscopy and selective ablation are conducted on atherosclerotic plaque constituents and adipose/fat tissues.
Pulse compression in a differentially pumped gas-filled hollow-fiber was used to generate compressed laser pulses of 1.2 mJ at 3.7 fs, corresponding to 1.5-cycle, 0.3-TW output, from positively chirped 33-fs laser pulses.
Flat and single mode supercontinuum generation spanning from 700 to 2350 nm was demonstrated using a nanosecond microchip laser and conventional cut-off shifted SMF. This configuration is attractive as a simple and low-cost light source.
Microwave and optical frequency references are simultaneously transferred through fiber using a frequency-stabilized mode-locked Er-fiber laser comb. The instability for transferred microwave and optical frequencies are 2.0times10-13 and 7.5times10-15@1 s, respectively, for 3 km transmission.
An all-fiber-integrated supercontinuum laser having time-averaged power scalable up to 10.5 W with diffraction limited beam quality is demonstrated. The SC pulses can be generated with arbitrary modulation patterns having on/off durations as short as 10 muS.
A frequency comb is phase-locked to a CW laser with an electro-optic-modulator providing 1.6 MHz feedback bandwidth. Residual phase noise is as low as -94 dBc/Hz, and the comb remained locked under mechanical vibration of up to 1.9 g.
Phosphate glasses are excellent host materials for lasers using rare-earth ion transitions. Combining highly-doped phosphate glasses and advanced fiber drawing techniques, we developed phosphate glass fiber lasers and will review recent advances in their performance.
We report a pulsed fiber laser that generates 31-nJ chirped pulses at 70-MHz repetition rate and 2.2 W average power. After dechirping outside the cavity, 80-fs pulses, with 200-kW peak power, are obtained.
Ytterbium doped Bi2O3-based glasses have been developed. The absorbance is as high as 2600 dB/m/mol. Maximum absorption of 7800 dB/m is achieved. Bi2O3-based Ytterbium doped fiber is fabricated, and demonstrated fiber lasers using newly developed fibers.
Higher-order-modes of a 70-mum core-diameter, Er-doped-fiber are characterized over a broad wavelength range using a supercontinuum with spatially and spectrally resolved imaging. Pumping the Er-doped-fiber with 1480-nm in the fundamental mode decreases the higher-order-mode content.
Hexagonally stacked all-glass multi-core leakage-channel fibers consisting of seven fused silica cores of up to 100 mum in diameter were fabricated. Simultaneous fundamental mode propagation in all cores and their active coherent combination was demonstrated.
Guided mode resonance filters produced a stable spectrally narrow Thulium fiber laser, at ~1985 nm. Laser spectral linewidths of 10-30 pm with a slope efficiency of ~35% were demonstrated. Spectral reflectivity was explored and showed 0.4-1.0 nm FWHM.
We have developed a normal-dispersion passively mode-locked ytterbium-doped fiber laser with a fundamental repetition rate higher than 400 MHz at a wavelength of ~1085 nm by use of a short linear cavity design.
Three-dimensional modeling of modal competition in fiber lasers is presented. The numerical model is used to design a large mode area active fiber laser in which high order modes' suppression is wavelength insensitive.
We report a fiber hydrogen sensor for low-temperature operation. The low-temperature response time of palladium-coated fiber Bragg grating in high attenuation fiber is enhanced by 40 times with in-fiber laser heating.
The fabrication of a reduced phase error, distributed feedback fiber laser in erbium-doped fiber is presented. Using the Trace Grating technique, the overall phase error has been reduced by a factor of 2.5.
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