A nonlinear filter using rotation of the polarization ellipse in air is investigated. Scheme to enhance the temporal contrast is developed for a double-CPA multi-terawatt Ti:sapphire laser. It ...supports an energy level of millijoule and has a high efficiency. The method allows suppression of the ASE pedestal, pre- and post-pulses by 3 orders of magnitude and also steepens the pulse front. For the physical interpretation of the results, numerical simulation of the filtering is performed.
A laser system applying spectrally shaped multipass amplifier and cross polarized wave generation produces pulses with 80 nm bandwidth at O.lmJ energy level, while the temporal contrast of the ...amplified 100 TW pulses exceeds 5.10 10 .
A laser scheme implementing a combination of negatively and positively chirped pulse amplification (NPCPA) is demonstrated. This method of amplification suppresses spectral narrowing typically ...appearing in chirped pulse amplification (CPA) lasers thus supporting pulse spectrum much broader than a conventional CPA. With a NPCPA Ti:Sapphire laser we have achieved laser pulses of 50 nm spectral width and 150 mJ energy without any additional spectral correction. The scheme appears as an easy and reliable solution to preserve spectral bandwidth in Ti:Sapphire lasers, especially at high power levels up to the Petawatt regime.
By pumping with a cw diode-pumped Nd:YAG laser operating at 946 nm laser operation of a new Yb-doped phosphate glass with 440 mW cw output power and a slope efficiency of 48% with respect to the ...absorbed pump power was achieved at room temperature.
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.
Laser performance of a diode-bar side-pumped Yb:YAG planar multimode waveguide geometry is reported. The waveguide was fabricated by thermal bonding technique with a 100-μm thick and 3-mm long active ...layer. This configuration offers an excellent confinement of the pump fields. By using an astigmatic resonator, a large overlap of pump and signal fields combined with a good beam quality have been realized. The
M
2 values were found to be 1.5 and 4 in the vertical and horizontal directions, respectively. A maximum CW output power of 1.2 W at 1032 nm has been obtained.
It is experimentally proved that successive amplification of negatively and positively chirped laser pulses (NPCPA) counteracts the gain narrowing effect typical in chirped pulse amplification (CPA) ...lasers. The scheme is robust and easy to adopt to even petawatt (PW) level high power laser systems. As a demonstration, a multi-terawatt (TW) Ti:sapphire laser system was modified to the NPCPA. The bandwidth of the 150 mJ output pulses exceeds 50 nm without any additional spectral correction, which is 30% broader than those currently available from conventional CPA lasers. Moreover, the NPCPA scheme gives an opportunity to increase an intensity temporal contrast without any compromise in pulse energy.
On the way to 100 TW–10 Hz titanium–sapphire laser facilities Kalachnikov, M.P.; Nickles, P.V.; Schönnagel, H. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2001, Letnik:
472, Številka:
1
Journal Article
Recenzirano
We present the design of a titanium–sapphire Ti
:
Sa laser system for generating 100TW laser pulses. The main aspects of the multiterawatt Ti
:
Sa laser architecture which can allow to reach the ...focusable intensity exceeding
10
20
W/
cm
2
are discussed.
The laser emission behavior of an array consisting of 150 Nd-doped fibers arranged within a common resonator is characterised by the synchronization of the individual emitters via injection seeding. ...The spatial and temporal synchronization of the array elements is investigated by time-resolved experiments on the nanosecond and picosecond time scale.< >
The modern Ti:sapphire lasers reach output powers close to the Petawatt level. Efficient consumption of the pump energy requires saturated pulse amplification which is usually employed in high peak ...power lasers. Here we propose to use a combination of downchirped amplification (DCA) and upchirped amplification to correct for the gain narrowing appearing in high peak power Ti:sapphire laser systems. Contrary to upchirped pulses, the downchirped pulse has blue spectral components at the leading edge. Thus, saturating an amplifier in this case leads to a blue shifting of the laser pulse spectrum forming a spectral shape with a sharp blue edge and a smooth red one, similar to the optimum required for broad spectrum amplification.
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