Verstärkung einer He-Ne-Gasentladung für die Laserwellenlänge λ=6328 AE

Abstract

The optical gain of He-Ne discharges for the laser wave-length of 6328 AE is investigated experimentally. The measurements are performed in two independent methods, which both give the same results. The gain of the He-Ne discharge is measured for a number of discharge tubes with different tube-lengthsl and tube-diametersD. The experiments show that the maximum gainĜ ₀ is a function of tube-length and-diameter:ĜG ₀(l,D) ≅

$$\hat G_0 (l,D) \cong \left[ {1 + 0,5\left( {\frac{{D_0 }}{D}} \right)^{1,4} } \right]^{{l \mathord{\left/ {\vphantom {l {l_0 }}} \right. \kern-\nulldelimiterspace} {l_0 }}} $$

(l ₀=1 m,D ₀=1 mm) if total gas pressure and discharge current are optimized. The optimum values of total pressure and current increase with smaller tube diameters. The gain over the cross-section is given by a Besselfunction of zero order.