Experimental measurements of the intensity fluctuations and the associated power spectra for the pump (argon) laser and the secondary (dye) laser show that the secondary laser follows pump fluctuations when operated far above threshold but acts as a low-pass filter when operated close to threshold. The experimental results are well explained by a laser model that accounts for pump fluctuations ...

Argon laser-sustained plasma (LSP) was generated using a 4-kW-class diode laser at pressures of 1.55–2.00 MPa. It found that there is tendency the minimum power for LSP generation to decrease from 4,200 W 2,850 as pressure increases. The temperature estimated based on emission spectroscopy approximately 12,000 K variation and 4,350 W. Because absorption coefficient increases with assuming inver...