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Reliability and lifetime of quasi-CW laser diode arrays are greatly influenced by their thermal characteristics. This paper examines the thermal properties of laser diode arrays operating in long pulse duration regime.
Cleaving of brittle materials is a non-ablating high potential process based on thermal-induced-stress. Amorphous materials such as glass can be separated as well as crystalline structures using near-infrared laser radiation and multiple absorption technology.
We will review the status of current laser based crystallization processes, and discuss the specifications and the critical design aspects of the laser and of the optical system developed for the TCZ production tool.
An efficient Cs vapor laser pumped by a diode laser has been demonstrated. This laser can be scaled to high powers and can be used for missile defense and for MANPADS protection.
A diode pumped Yb:YAG regenerative amplifier has been developed for short pulse generation. Average output power of 10 W was achieved at pulse repetition rate of 100 kHz with 6.2 ps pulse width.
A table-top lambda = 13.2 nm soft X-ray laser operating at 5 Hertz repetition rate with 1 muW average power was demonstrated in Ni-like Cd. Lasing down to 10.9 nm was also obtained in transitions of other Ni-like ions.
Pump power scaling with spot size is studied experimentally and theoretically in a 1060 nm VECSEL with a diamond heatspreader. The dependence of the efficiency and thermal roll-over on pump spot size are discussed.
A high-rep-rate Q-switched Nd-YAG laser is used to obtain non-destructive multiphoton-excited laser scanning fluorescence images of a lithographic 2D pattern of polymeric samples on glass with a resolution of <0.5 mum.
We investigate interaction of THz radiation with semiconductor lasers at room temperature and show that the voltage across the diode varies linearly with the injected THz power when the diode is operated just below threshold.
We show that the SU-8 epoxy resist can be exposed by two-photon absorption at 4 K, allowing spectroscopy and lithography to be performed by the same apparatus. We present a systematic study of the exposure parameters.
The development of a high-power diode-pumped continuous-wave Yb:KGW laser is reported. The laser delivered 6 W of average power at 1049 nm and was tunable between 1035 and 1076 nm with more than 1.3 W of output power.
Output power of 470 mW, slope efficiency of 64.5% and tunability between 1016 and 1049 nm are achieved with the novel disordered uniaxial crystal Yb:LiGd(MoO4)2. Both possible polarizations are compared and diode-pumping is also demonstrated.
We study the characteristic conical emission of a blue femtosecond filament in air. A significant improvement of the beam quality is obtained during the filamentation process.
A Ti:Sa laser using a combination of negatively- and positively-chirped pulse amplification (NPCPA) is demonstrated. The method suppresses spectral narrowing typically appearing in CPA lasers thus supporting bandwidth much broader than a conventional CPA.
We report on the development of a sub-mJ Ti:sapphire laser operating at 50 kHz. Downchirped-pulse amplification chain, including 2 amplifiers pumped by one green laser, allows the generation of multi-GW femtosecond laser pulses.
We describe the strong wavelength-stabilization of high-brightness extended-cavity lasers based on 808-nm and 976-nm tapered amplifiers by use of volume Bragg gratings. Single-frequency operation has been obtained in a robust and simple design.
We report on a Q-switched photonic crystal fiber laser with a 60-mum ytterbium-doped core. Sub-10-ns pulses with 2.5-mJ energy are generated at low repetition rates and up to 100-W average power at 100-kHz in single-transverse-mode output.
Propagating orthogonally polarized probe and coupling lasers through a Cesium beam we explored two closed transitions. Electromagnetically induced absorption and absorption within transparency were measured on one line, electromagnetically induced transparency on the other one.
Diffraction-limited nanosecond pulse generation with MW-peak powers and multi-mJ-energies has been explored using 80-mum core Yb-doped fibers, demonstrating 1-MW peak power pulses with 85-W of average power at 100-kHz and 1.56-MW peak at 50-Hz.
A monolithic, electrically-pumped, passively mode-locked diode laser at 1550 nm with 58 pJ of pulse energy has been demonstrated. The laser produces 10-ps pulses at a 4-GHz repetition rate.
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