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Efficient broadband spectrum oscillation was obtained directly from a laser-diode-pumped Kerr-lens mode-locked Yb:YAG laser with intracavity nonlinear media. The spectrum was expanded to around 1040 nm to 1070 nm. The spectrum is much broader than the fluorescence spectrum at 1050 nm.
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.
The carrier-envelope phase dynamics of octave-spanning Ti:sapphire lasers are analyzed based on a one-dimensional laser. It is found that self-steepening is the major contributor to the energy dependent carrier-envelope phase and that center-frequency-shifts are negligible.
We present a compact, passively mode-locked and prismless Nd:phosphate laser, pumped by a single-mode, low-power (150-mW) laser diode. We obtained self-starting 270-fs near transform-limited pulses, employing a single Gires-Tournois mirror for intracavity dispersion compensation.
Passive synchronization is demonstrated between the self-similar Yb-fiber and the stretched-pulse Er-fiber mode-locked lasers. The pulse repetition rates of the two mode-locked lasers can keep locked when multiple-pulse bound states or periodic pulse collisions occur.
Femtosecond Yb:YAG laser at 1053 nm was realized by optimized crystal length and doping concentration, stable mode-locking power of 180 mW was achieved under 2 W pump. Measurement shows 170 fs pulse duration and 7 nm spectrum bandwidth.
A fundamentally mode-locked Er:Yb:glass laser with a record high repetition rate of 101 GHz generates 30 mW average power in 1.1-ps pulses in the 1.5-mum telecom window. Frequency degeneracies of transverse cavity-modes are investigated.
Yb3+:(YGd2)Sc2(GaAl2)O12 disordered ceramic has been fabricated. 2.9-W average power with an optical-to-optical efficiency of 44% was achieved in a continuous-wave operation. 112-fs pulse duration with 860-mW average power was also achieved in a mode-locked operation.
External redirection of light from one propagation direction of a ring laser back into the opposite direction forces uni-directional operation. We investigated this so-called self-injection locking effect and achieved single-frequency operation.
New configurations for phase locking and beam combining very large laser arrays with intra-cavity polarization elements are presented. We demonstrated efficient phase lock of 24 Nd:YAG lasers and beam combining of 5 lases.
We phase lock an array of 169 Nd:YAG lasers using Fourier filtering in a common degenerated resonator. We observe a wide variety of stable phase structures that are in exact agreement with calculated ones.
Different types of carbon nanotube saturable absorbers were fabricated and characterized. Their application for solid-state laser mode-locking enabled the generation of sub-100-fs pulses near 1.25 mum with powers up to 280 mW at 79 MHz.
A Nd:YVO4 laser was locked with a chirped volume Bragg grating. Tuning was performed from 1063 nm to 1065 nm by grating translation with 4 W maximum output power. With Cr:YAG, Q-switched pulses with 17 ns, 8 muJ were achieved.
The first mode-locked Yb:LuScO3 thin disk laser generates 7.2 W average power in 227-fs pulses, which are the shortest pulses obtained from any ultrafast thin disk laser. 10.1 W average power were achieved at longer pulse durations.
Nd:YLF laser system has been developed to drive an electron photo-injector. A chain of mode-locked 1.5 GHz oscillator, preamplifier, and two powerful diode-pumped amplifiers deliver 6.4 kW long IR bunches which are converted to 262 nm.
Mode-locking of the disordered cubic sesquioxide crystal Yb:LuScO3 using a reflection-type single-walled carbon nanotube saturable absorber is demonstrated under diode pumping and compared with passive mode-locking by a commercial SESAM.
We report on highly stable active continuous mode-locking in diode-pumped Nd:YVO4 with adjustable pulse durations between 34 ps and 1 ns. An average output power till 7.3 W, an excellent beam quality M2<.1 and transform-limited pulses were obtained.
We are developing a 100-kW Nd:YAG cw solid-state laser system. Seven wavefront-corrected 15-kW MOPA (master oscillator power amplifier) laser chains are phase locked to achieve a single aperture output beam with good beam quality.
We report a high power/high energy dual-crystal Yb:KYW regenerative amplifier using a single chirped volume Bragg grating (CVBG) as stretcher/compressor with more than 12 W average power at repetition-rates >40 kHz and compressed pulsewidths around 500 fs.
Ultra-short pulse compression for tunable mode-locked Ti:sapphire lasers is demonstrated by utilizing a 1-mum-diameter tapered fiber with grating pairs. For 100 fs input pulses at the 880-nm center wavelength, the optical bandwidth is broadened from 14 nm to 45 nm after propagating through the 1-cm long tapered fiber. After passing through the grating pairs with 1.6 cm separation, the final pulse...
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