Design and test of miniaturized glass ceramics HeNe laser with frequency and intensity simultaneously stabilized

Abstract

A miniaturized HeNe laser with intensity and frequency simultaneously stabilized is described. The laser uses a monoblock glass ceramics as its tube to construct an improved steady structure. The closed loop cavity length control system stabilizes its frequency and the discharge current regulating system stabilizes its intensity. The electronic system integrating power supply and stabilization system is designed within two small circuit boards. The laser tube and circuit boards are assembled into a small package with dimensions of 180 mm×100 mm×150 mm. The laser outputs s-polarized light at wavelength of 632.99 nm with power of 0.44 mW. Test results show that its frequency stability can reach 8.4×10(-11) (1s Allan variance over 3 h) and frequency reproducibility at 1.3×10(-8). The laser's intensity stability is 0.011% over 9 h.

A He-Ne gas laser with tunable wavelength and stable output intensity based on photon tunneling

“…The thermal expansion coefficient of the Zerodur is less than 2×10 8 / • C, and it is much smaller than that (6×10 7 / • C) of quartz glass tubes which are widely used as cavities for He-Ne lasers. 19,23 This can improve the temperature stability The bottom which has an arcuated roof in the center is on the outer surface of the prism. The air gap between the arcuated roof and the prism is the tunneling gap.…”

“…This method is different from the previous intensity stabilizing schemes which usually control the pumping current or the cavity length to realize stability. [18][19][20][21] These two factors cause instability simultaneously, and previous schemes controlled only one which had greater instability under their experimental conditions to stabilize the intensity. Our method utilizes the cavity length to modulate the wavelength and avoids this problem.…”