Influence of a magnetic field on laser-produced Sn plasma

Abstract

The effects of an external magnetic field on Nd:YAG laser-produced Sn plasma have been investigated. The characteristics of ion debris from Sn plasma, emission spectra, and EUV radiation have been studied by the time-of-flight method and the optical emission spectroscopy. Our results show that the ion kinetic energies of the plume species can be effectively reduced with a modest magnetic field of 0.6 T. With the presence of a magnetic field, the spectral intensities of Sn I and Sn II show significant enhancement and the electron density of plasma is about 2 times higher. We have not found any influence of magnetic field on the characteristics of EUV emissions.

Fundamental mechanisms of nanosecond-laser-ablation enhancement by an axial magnetic field

“…Because of this fundamental reason, reduction of the LPP shielding effect is among the major approaches for improvement of the laser-surface coupling for nanosecond pulses [5][6][7][8][9][10][11][12]. Steady magnetic field [8][9][10][11][12][13][14][15][16][17][18][19]21], ablation under vacuum conditions [7,20], and dc electric field [21,22] are employed to remove the LPP from a laser beam, to confine LPP to a smaller volume, or to lower plasma density. Of those approaches, use of steady magnetic field has received the most attention due to the feasibility of a better, more flexible, and more stable control over the laser-surface coupling [8][9][10][11][12][13][14][15][16][17][18][19].…”

“…The fundamental mechanism of the magnetic-fieldsupported reduction of plasma shielding is associated with the action of the magnetic Lorenz force F [8][9][10][11][12][13][14][15][16][17][18][19]:…”

Effects of a static inhomogeneous magnetic field acting on a laser-produced carbon plasma plume

“…This configuration can be achieved by using two parallel magnets, which generate a magnetic field which is either transverse [24][25][26] or parallel [27][28][29] to the axial direction of the expanding laser plasma plume. Harilal et al 24 reported on the plasma dynamics and optical emission of an Al laser-produced plasma propagating in an almost uniform transverse ∼0.6 T magnetic field.…”

“…Using also a transverse magnetic field configuration, Behera et al 25 observed plasma plume splitting in the case of an Al laser-produced plasma propagating in a ∼ 4.5 T field, with 20 mTorr Argon background, with the leading plume component showing resistive slowing, as oppose to free expansion for the trailing component. For the case of a Sn laser-produced plasma propagating in the presence of a transverse field of 0.6 T maximum strength, Lan et al 26 observed both, a decrease in the off-axis ion emission and an enhancement of the optical emission from neutral and ionized species. Pagano and Lunney 27 observed lateral confinement effects on a Cu laser-produced plasma propagating in a ∼ 0.3 T axial magnetic field, and reported an enhancement in the on-axis ion beam emission.…”

Influence of Pre-Ionized Plasma on the Dynamics of a Tin Laser-Triggered Discharge-Plasma

“…An EUV photo-diode (IRD, AXUV20HS1BNC) was used to observe the X-ray signal from a discharge. A 500 nm thick zirconium metal filter was placed in front of the IRD diode to select wavelengths from 6.5 nm to 16.8 nm [21]. These outputs of the current, the voltage, the signal of the laser, and the X-ray signal in one shot were recorded on a digital oscilloscope (Tektronix, MDO3054).…”