A four kHz repetition rate compact TEA CO2 laser

Yijun Zheng; Rongqing Tan

doi:10.1117/12.2032767

27 September 2013 A four kHz repetition rate compact TEA CO₂ laser

Yijun Zheng, Rongqing Tan

Proceedings Volume 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications; 89040H (2013) https://doi.org/10.1117/12.2032767
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

A compact transversely excited atmospheric (TEA) CO₂ laser with high repetition-rate was reported. The size of the laser is 380 mm×300 mm×200 mm, and the discharge volume is 12×10³ mm³. The laser cavity has a length of 320mm and consists of a totally reflective concave mirror with a radius of curvature of 4 m (Cu metal substrate coated with Au) and a partially reflecting mirror. The ultraviolet preionization makes the discharge even and stable，the output energy can be as high as 28 mJ under the circumstance of free oscillation, and the width of the light pulse is 60ns．To acquire the high wind velocity, a turbocharger is used in the system of the fast-gas flow cycle. When the wind speed is 100m/s, the repetition rate of the transversely excited atmospheric CO₂ laser is up to 2 kHz. On this basis, a dual modular structure with two sets of the gas discharge unit is adopted to obtain a higher pulse repetition frequency output. The dual discharge unit composed two sets of electrodes and two sets of turbo fan. Alternate trigger technology is used to make the two sets of discharge module work in turn with repetition frequency of 2 kHz, the discharge interval of two sets of the gas discharge unit can be adjusted continuously from 20 microseconds to 250 microseconds. Under the conditions of maintaining the other parameters constant, the repetition frequency of the laser pulse is up to 4 kHz. The total size of laser with dual modular structure is 380mm×520mm×200mm, and the discharge volume is 24×10³ mm³ with the cavity length of 520mm.

Citation Download Citation

Yijun Zheng and Rongqing Tan "A four kHz repetition rate compact TEA CO₂ laser", Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 89040H (27 September 2013); https://doi.org/10.1117/12.2032767

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KEYWORDS

Carbon dioxide lasers

Pulsed laser operation

Electrodes

Gas lasers

Reflectivity

Mirrors

Carbon dioxide

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