CO2 Waveguide Lasers

Abstract

Compact cw single-mode CO2 : He : N2 lasers with a 1-mm-diam dielectric waveguide discharge tube have exhibited gains of up to 37 dB/m, volumetric power outputs of 15 W/cm3, and saturation parameters of 3600 W/cm2 with a coolant temperature of −70°C. With tap water cooling at 20°C the corresponding values were 24 dB/m, 9.5 W/cm3, and 2100 W/cm2. All of these values are substantially larger than those obtained with conventional CO2 lasers. A 12.5-cm-long waveguide tube with an active volume of 0.096 cm3 gave a power output of 1.4 W at −70°C and 0.9 W at 20°C coolant temperature.

Misalignment analysis of combination-cylinder discharge CO_2 laser

“…The main high-power CO 2 lasers used for laser processing contain multichannel slab discharge CO 2 lasers [1][2][3][4][5], waveguide CO 2 lasers [6][7][8], transverse flow CW CO 2 lasers [9][10][11], fast axial flow CW CO 2 lasers [12][13][14], and axisymmetric-fold combination cavity (ASFC) CO 2 lasers [15][16][17][18][19][20]. The above CO 2 lasers have many advantages; for example, the waveguide and slab CO 2 lasers with output power of 500-1000 W have a small volume and can be fixed directly with machine tools for laser processing.…”

“…A new CO 2 laser [combination-cylinder discharge CO 2 laser (CCDCL)] is presented [21] to overcome the problems of the above CO 2 lasers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The discharge area of the CCDCL is a new combination cylinder, and the resonator mirror consists of two new combination mirrors.…”

“…Therefore, it can output the laser beam with high power. The laser resonator, in this paper, is different from that of the above lasers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The laser with an annular gain area will output the annular laser beam with zero central intensity; the beam has many important applications in the atom optics, such as analysis of guiding, focusing, and trapping of ultracold atoms [22][23][24][25].…”

CO2 laser drives extreme ultraviolet nano-lithography — second life of mature laser technology

“…A period between early seventies and nineties of last century was witness to the research efforts on new aspects of the sealed−off, diffusion cooled waveguide CO 2 lasers [52][53][54]. The successful combination of waveguiding and the RF−discharge [55] have led to a culmination in a form of power−scalable, planar waveguide CO 2 lasers [56][57][58], marking a new era of the compact CO 2 laser tech− nology.…”

New phase-matchable nonlinear optical crystals of the formate family

“…It is of practical interest for its useful second-order nonlinearity and easily-grown large crystals. [4] have also been shown to be good quality nonlinear optical materials grown from aqueous solutions. Formate crystals are especially of interest for their short wavelength limit of transmittance of 0.24 pm and for easy growth of large-size crystals of good optical quality.…”