5 September 2002 Experimental research on second harmonic generation conversion efficiency of the TEA CO2 laser
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Proceedings Volume 4914, High-Power Lasers and Applications II; (2002); doi: 10.1117/12.481793
Event: Photonics Asia, 2002, Shanghai, China
Abstract
Second harmonic generation of tunable TEA CO2 laser has the greatest potential for providing the coherent radiation in the wave range of 3~5µm which has many virtues. But the low conversion efficiency has restricted its wide application. In order to raise the conversion efficiency by lengthening the nonlinear effecting extent, two crystals were used which were placed in symmetrical position. In this way the beam can be compressed at the same time. In our experiment, the conversion efficiency up to I .5 times that of one crystal was achieved. Another factor that can affect the conversion efficiency was the quality of the pumping laser, so a plasma shutter was used to shape the laser pulse. Through the shutter the pulse energy was decreased but the pulse width was compressed accordingly, so the pump power was enhanced. By means of this, the conversion efficiency was improved from less than 2% to 12.9% and the highest output energy of 1 .44mJ has been achieved.
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Deming Ren, Xiaoyong Hu, Yuhong Wang, Yanchen Qu, "Experimental research on second harmonic generation conversion efficiency of the TEA CO2 laser", Proc. SPIE 4914, High-Power Lasers and Applications II, (5 September 2002); doi: 10.1117/12.481793; https://doi.org/10.1117/12.481793
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KEYWORDS
Crystals

Second-harmonic generation

Camera shutters

Plasma

Frequency conversion

Carbon dioxide lasers

Harmonic generation

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