CW HIGH-POWER CO2–N2–He LASER

Optical Harmonic Generation in the Infrared Using a CO2Laser

“…(SHG in some of these crystals has been previously reported in reflection 2 and transmission 3 experiments using ruby laser at 6943 A and neodymium laser at 1.06 \i.) Using an unfocused C0 2 laser in cw 4 and Qswitched 5 operation, we have obtained the nonlinear coefficients for these materials at 10.6 JLU Phase matching was achieved in singlecrystal selenium at 6 m «10° from the optic axis. Since the band gap of selenium is at -8000 A, the large nonlinear coefficient d u (Se) = 1.9 xlO"" 7 esu should allow the use of Se as a phasematchable nonlinear optical material at wavelengths shorter than those possible in tellurium.…”

“…(For details of the C0 2 laser, see Ref. 4.) The Q-switching mirror was gold coated and was rotated at speeds up to 120 rps using a synchronous motor.…”

Dynamic behavior of CO₂ lasers

“…The resonance condition is kql-(m +n + 1 )(tan-1(Zz/Zo)-tan-1 (z 1 /Zo))=q7T (2)(3)(4)(5)(6)(7)(8)(9)(10)(11) for Hermite-Gaussian, and…”

“…The other advance was made by Moeller and Rigden [8], who showed that helium can enhance the laser output as well as nitrogen. In the meantime, Patel et.al [9] obtained from C0 2 later a very impressive CW output power in excess of lOOw by using a flowing C0 2 -N 2 -He gas mixture. This was a significant achievement.…”

Atmospheric pressure active nitrogen (APAN) - a new source for analytical emission spectroscopy

“…Later investigations determined that the metastable nitrogen species were produced by energy transfer from argon metastable atoms to ground state nitrogen molecules (20)(21). Nitrogen raetastables have since then been also excited in helium (22) and krypton (23).…”