Bailing Yang

Experimental investigation of an unstable ring resonator with 90-deg beam rotation for a chemical oxygen iodine laser

We report the experimental results of an unstable ring resonator with 90-deg beam rotation for a kilowatt class chemical oxygen iodine laser (COIL). The distributions of near-field phase and far-field intensity were measured. A beam quality of 1.6 was achieved when the COIL average output power was approximately 5 kW.

Temporal and 2-D small-signal gain measurements in a supersonic COIL

A dedicated CW chemical oxygen iodine mini-laser is constructed and used to probe the two-dimensional (2-D) distribution of small-signal gains in a supersonic CW chemical oxygen iodine laser (CW COIL). The uneven lateral gain distribution may possibly be explained by boundary layer effects.

Chemical oxygen-iodine laser research in Dalian

A multi-kilowatt supersonic chemical oxygen iodine laser (COIL) has been constructed. Two types of jet singlet oxygen generator (SOG) such as tube-array and plate have been tested. An output power of 8.8KW with chemical efficiency of 2 1 .4% was obtained at the chlorine flow rate of 45Ommole/s. The influence of BHP (basic hydrogen peroxide) temperature on the output power of COIL has been studied. And the absolute concentration of O2(1AE) in the jet SOG was measured using the Piston-source method.

Measurements of absolute O2(a1A) concentration in singlet oxygen generator by using the piston source method

A calibrated piston source of light, which simulates a cylindrical-volume source, has bene used to measure the absolute concentration of O2(a1(Delta) ). It is proved that this Piston Source Method is one of the simplest and most convenient ways to measure the O2(a1(Delta) ) concentration in a singlet oxygen generator, especially in real time measurements.

Experimental study of disharge characteristics and fluorine atom yield on DC discharge of NF 3 /He

DC discharge characteristics of NF3/He have investigated experimentally at many kinds of experimental conditions, for example, different electrodes material, a few of distance between the two electrodes, flow rates of the gas NF3 or He, a series of series-wound resistances and give the steady and optimum discharge parameters finally. Fluorine atom yield from the DC discharge of NF3/He have studied experimentally and the relationship of fluorine atom yield and the load power is shown for the first time.

Effect of NCl(a 1 Δ) self-annihilation on the performance of NCl(a 1 Δ)-I laser

The effect of NCl(a1Δ) self-annihilation on the production of NCl(a1Δ) and energy extraction of NCl(a1Δ)-I laser was simulated by means of a simplified continuous flow F-P resonator model. The results show that NCl(a1Δ) self-quenching is an important influence on NCl(a1Δ) production and energy extraction of NCl(a1Δ)-I laser and is the most important channel for transport losses of NCl(a1Δ). The efficiency of NCl(a1Δ) production with NCl(a1Δ) self-annihilation is much less than that without NCl(a1Δ) self-annihilation. The optimal location for cavity resonator, the profile of power density along the flow direction and the total power are dramatically dependent on the order of magnitude of the rate constant of NCl(a1Δ) self-quenching reaction. The results show that it is necessary to do more works on the measurement of the rate constant of NCl(a1Δ) self-annihilation reaction and its dependency on temperature in order to accurately analyze, design and value AGIL(All-gas Phase Iodine Laser).

Experimental study of the system of Cl/Cl2/He/HN3/I2

By means of a microwave generator chlorine diluted by helium was dissociated to chlorine atoms that subsequently reacted with hydrogen azide to produce the excited states of NCl(a1Δ). Meanwhile, molecular iodine with carrier gas of helium reacted with atomic chloride to produce atomic iodine which then was pumped to excited state of I(2P1/2) by an energy transfer reaction from NCl(a1Δ). In this paper, the changes of NCl(a1Δ) and NCl(b1Σ) emission intensity is presented upon admitting I2/He into the stream of Cl/Cl2/He/HN3/NCl(a1Δ)/NCl(b1Σ). Moreover, the production of excited state of atomic iodine I(2P1/2) dependent on flow rates of gases was also investigated. The optimum parameters for I(2P1/2) production are given.

Parametric study of NCl(a1Δ, NCl(b1Σfrom the reaction of Cl/Cl2/He + HN3/He

By means of Microwave generator chlorine diluted by helium is dissociated to chlorine atoms that subsequently react with hydrogen azide to produce excited states of NCl(a1(Delta) ) and NCl(b1(Sigma) ). In this paper, the intensity of NCl(a1(Delta) ) and NCl(b1(Sigma) ) emission dependent on the flow rates of different gases is studied. Moreover, the production of NCl(a1(Delta) ) and NCl(b1(Sigma) ) along the reaction tube is also investigated. By using a simple titration method, we obtain the dissociation efficiency of molecular chlorine up to 100 percent at the flow rates of chlorine no more than 1 mmol/s. We also achieve the quenching rate of NCl(a1(Delta) ) by Cl2 is about 4 X 10-13 cm3/sec molec with excess flow rates of chlorine. Finally, the optimum parameters for NCl(a1(Delta) ) and NCl(b1(Sigma) ) production are summarized.

Investigation of UR90 outputting annular beam for a chemical oxygen-iodine laser

In this paper, we mainly describe the structure of an unstable resonator with 90-deg beam rotation(UR9O) outputting annular beam for a chemical oxygen iodine laser(COIL) and the geometry mode of the beam. A beam quality of 3.2 times diffraction limit was achieved in the experiment while the COIL average output power was approximately 4kw in the case ofmagnification of 1.69, as well as the property ofthe annular beam was analyzed.

The hyperfine gain spectrum, gain profile, and cavity temperature in a supersonic COIL

The hyperfine gain spectrum of a chemical oxygen-iodine laser (COIL) is investigated experimentally. Six hyperfine lines are obtained in a COIL gain medium as well as an iodine absorption cell. Meanwhile, gain profiles and cavity temperatures are calculated.