Zuguang Ma

Optical filtering characteristic of potassium Faraday optical filter

An ultra-narrow bandwidth potassium Faraday anomalous dispersion optical filter (FADOF) at the D/sub 2/ line is studied theoretically and experimentally. The effect of temperature on the characteristics of the potassium Faraday filter is discussed and the transmission versus temperature is given. Our research results show that the transmission of the K-FADOF reaches nearly 90% with a bandwidth of only 1.5 GHz. To meet different requirements, K-FADOF can operate at line-center or in the line-wing by changing the working parameters.

Potassium Faraday optical filter in line-center operation

Ultra-narrow bandwidth potassium Faraday anomalous dispersion optical filters at D lines are studied theoretically and experimentally. The anticipated performance in the line-center operation is demonstrated experimentally with a thin K cell in an axial magnetic field of 0.0815 T.

Raman-resonant spontaneous four-wave parametric process in sodium vapor

Abstract A yellow cone radiation at ∼ 5894 A and a strong radiation at 1.14 μm as well as 3S–4S stimulated electronic Raman scattering have been observed in sodium vapor excited by an UV dye laser. A Raman-resonant spontaneous four-wave parametric process is proposed and discussed.

Potassium Faraday optical filter in line-center operation at 770 nm

In this paper we investigated potassium Faraday filter at 770 nm theoretically and experimentally. With a potassium cell of 0.01 m in length in an axial magnetic field of 0.0815T, line-center operation has been achieved. The calculated peak transmission has reached 93% with a FWHM bandwidth of only 1.6 GHz, the measured FWHM bandwidth of the filter is 2.2 GHz, which is in detail agreement with the theoretical result.

Theoretical and experimental study of Cs 852-nm FADOF

In this paper, the theoretical model and experimental demonstration of Cs 852nm FADOF in weak and strong magnetic field are discussed. Whenthe FADOF system working under the weak field, the theoretical and experimental results are agreement with the previous repot. In the case of strong field, when performing condition is B equals 0.0883T, T equals 351K, the line-center operation is observed. The comparison between the theory and the experiment gives reasonably expected results.

Potassium Faraday optical filter in line-center operation at 766 nm

In this paper we investigated potassium Faraday filter at 766 nm theoretically and experimentally. With a potassium cell of 0.01m in length in an axial magnetic field of 0.0815T, the line-center operation has been achieved. The calculated peak transmission has reached 83 percent with a FWHM bandwidth of only 1.5GHz, the measured FWHM bandwidth of the filter is 1.6GHz, which is in good agreement with the theoretical result.

New blue laser of the O2(1Δg)dimer: [O2(1Δg)]2*

A new band, with two peaks at 486 nm and 656 nm, respectively, has been observed in microwave-excited high pure oxygen. The reason that the new band is assigned to O2(1Δ g) dimer transitions is presented. A net gain of 2.2% cm-1 for 486 mm emission has been obtained by the method of amplified spontaneous emission. The laser oscillation has been realized at 486 nm with a flat-concave stable resonator, its maximum output power is about 130 (mu) w.

Controllable multiple-ring fringes in central brightness

With several different glasses for nonlinear optical materials we first observed the far field multiple-ring fringes in them using a cw Ar+ laser as a light source at 514.5 nm and 488.0 nm, respectively. The central brightness of multiple-ring fringes could be controlled through changing incident power or the sample position near the focus. This phenomenon is considered as a result of spatial self-phase modulation caused from self-focusing. The thresholds of fringes and the thresholds of laser damage in three kinds of glasses are different from one another. Moreover, the far-field fringes of reflecting light were watched carefully. The light power limiter of optical density D equals log 1/T(lambda ) equals (infinity) can be constructed with the phenomenon.

Research of the laser oscillation of the dimer of O2(1deltag)

The laser output power of the dimer of O2(1(Delta) g) has been estimated theoretically. The dimer of O2(1(Delta) g) was generated by microwave (2.450 GHz) exciting high pure oxygen. The laser oscillation of the dimer of O2(1(Delta) g) was realized at 656.3 nm for the first time, and the laser power was as high as 100 (mu) w, which corresponded to theoretical estimation in order of magnitude. In addition, the divergent angle measured was about 37.3 mrad.