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Laser Beam Expanders to Suit Most Laser Types, from Small Waveguide Lasers up to Multi-Kilowatt Industrial Lasers

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Laser Beam Expanders to Suit Most Laser Types, from Small Waveguide Lasers up to Multi-Kilowatt Industrial Lasers Beam Expanders We manufacture a variety of laser beam expanders to suit most laser types, from small waveguide lasers up to multi-kilowatt industrial lasers. There is also a modular range for experimental and laboratory purposes. The most common type of beam expander is derived from the Galilean telescope which usually has one negative input lens and one positive output lens, as shown in the following figure. The input lens presents a virtual beam focus at the output. For low expansion ratios (1.3-20×), the Galilean telescope is most often employed due to its simplicity, small package size, and low cost. As shown in right figure, the lens M3 focuses the laser beam onto the front focus plane and the new beam waist ω′0 and divergence angle θ′ can be represented as (1) and (2) (3) where ω(l) is the radius of the beam entering the lens M3, l is the distance between the lens M3 and the beam waist ω0 from the laser generator, and f3 is the focal length of the lens M3. Since ω0′ lies on the back focus plane of the lens M4 with a longer focal length, f4, the Gaussian beam with a beam waist ω′0 will be collimated by the beam expander. The collimation ratio of the beam expander for a Gaussian beam is as follows (4) where T1 = f4/f3. The beam waist ω″0 and divergence angle θ″ after the beam expander are (5) and (6) Substituting Equation (1) into Equation (5), the following expression can be obtained www.SintecOptronics.com www.sintec.sg [email protected] [email protected] 1 (7) From Equations (4)-(7), it is concluded that the beam expansion ratio and the collimation ratio for a Gaussian beam depend not only on the specifications of the beam expander, but also on the laser beam parameters as well as the positions of the optical lenses. The function of a beam expander is to reduce the divergence angle of laser beams and thus make the focused beam diameter smaller. The specifications of the lenses used in the beam expanders are: Material: BK7 fine annealed, fused silica and ZnSe depending on laser wavelength. Diameter: -0.1mm Thickness: ±0.1mm Flatness: λ/4 Surface Quality: 60-40 scratch-dig Coating: HR dielectric coatings R > 99% Part number description: BEST-xxx-yy-T-AA BEST --- BEST series beam expanders, zoom beam expanders. xxxx------- laser wavelength: 10.6 means 10.6um, 532 means 532nm, 633 means 633nm. yy -------- expansion ratio (magnification) in times T ---------- type: T means adjustable beam expander; none means fixed beam expander. AA -------- special purpose. Example: BEST-10.6-3: 10.6um fixed beam expander, 3x. BEST-10.6-3.5T: 10.6um adjustable beam expander, max. 3.5x. We may use the following abbreviations in the tables: WL=wavelength, MAG=magnification, CA=clear aperture, CA1=input clear aperture, CA2=output clear aperture, D1=input diameter, D2=output diameter, L1=total length of beam expander, MT=connection or mounting thread, D=diameter We offer 3 types of beam expanders: fixed beam expanders, adjustable beam expanders, (motorised) zoom beam expanders at various wavelengths of 213nm, 266nm, 343-355nm, 405nm, 633nm, 515-545nm, 780-980nm, 1030-1090nm, 1550nm, 1850-1980nm, 10.6um. Other wavelengths and custom-designed beam expanders are available upon request. For more information, please feel free to contact us. www.SintecOptronics.com www.sintec.sg [email protected] [email protected] 2 CO2 Laser Beam Expanders (10.6μm & 9.4μm) There are 2 types of beam expander: fixed and adjustable beam expanders. For the fixed beam expanders, the spacing between the two lenses inside the beam expander is fixed, but the spacing between the two lenses inside the adjustable beam expanders is adjustable. The lens material is ZeSe, which allows the red light to go through the beam expander. (1) Fixed Beam Expanders BEST-A Series 10.6um Fixed Beam Expanders Part number MAG,x CA1,mm CA2,mm OD(D2),mm L1,mm Connection, mm BEST-1064-2A 2 10 20 25 35.3 M22x0.75 BEST-1064-3A 3 8 20 25 85.1 M22x0.75 BEST-1064-4A 4 8 30 25 70.7 M22x0.75 BEST-1064-6A 6 8 30 37 97.2 M22x0.75 BEST-1064-8A 8 8 30 37 69 M22x0.75 BEST-W Series 10.6um Fixed Beam Expanders The material is ZnSe for all the CO2 laser beam expanders. Their outline is a cylinder or like a trumpet whose input and output diameters are different. Part No. MAG CA1 (mm) CA2 (mm) D1 (mm) D2 L1 L2 (mm) (mm) (mm) BEST-9.4-2-W 2 16.5 23 M22X0.75 28 59 54 BEST-9.4-3-W 3 10 20 28 28 61 51.5 BEST-9.4-5-W 5 13 23 20 30 72 42 BEST-10.6-1.5-W 1.5 13 16 20 - 35 - BEST-10.6-2-W 2 10 15 22 - 32.5 - www.SintecOptronics.com www.sintec.sg [email protected] [email protected] 3 BEST-10.6-2A-W 2 15 17 22 - 35 - BEST-10.6-2L-W 2 27 53 M44X1 63 72 47 BEST-10.6-2.5-W 2.5 12 20 27 - 54 - BEST-10.6-3A-W 3 10 15 20 20 61 - BEST-10.6-3B-W 3 12.5 20 20 28 59 29 BEST-10.6-3C-W 3 13 20 20 28 110 60 BEST-10.6-3-W 3 11 16 20 20 59 - BEST-10.6-3.3-W 3.3 10 15 21 21 67 - BEST-10.6-4-W 4 10 20 20 28 67 46 BEST-10.6-4A-W 4 10 25 20 31 67 48 BEST-10.6-4C-W 4 12 23 20 30 135 90 BEST-10.6-5-W 5 12 23 20 30 72 47 BEST-10.6-5A-W 5 12 28 20 36 70 45 BEST-10.6-6A-W 6 10 28 20 36 75 55 BEST-10.6-8-W 8 13 26 20 36 120 75.1 BEST-10.6-8A-W 8 10 30 20 36 73 55.5 BEC Series 10.6um Fixed Beam Expanders Part No. MAG CA1(mm) CA2(mm) D1(mm) D2 (mm) L1(mm) L2(mm) Screw BEC-10.6-2 2.0 12.7 17 - 25 46.5 - M22x0.75 BEC-10.6-2.5 2.5 12.7 20 - 25 59.65 - M22x0.75 BEC-10.6-3 3.0 12.7 17 - 25 64.5 - M22x0.75 BEC-10.6-4 4.0 12.7 17 - 25 70.5 - M22x0.75 BEC-10.6-5 5.0 12.7 20 - 25 72 - M22x0.75 BEC-10.6-6 6.0 12.7 27 - 32 75.75 - M22x0.75 BEC-10.6-8 8.0 12.7 27 24 27 71 37 M22x0.75 (2) Adjustable Beam Expanders These beam expanders are specially designed for large divergent laser beam. Changing the distance between two lenses inside the beam expander can decrease the beam divergence to obtain better collimation of the laser beam. If they are used for large-divergence laser beam, you may turn the inner body to increase the spacing of two lenses and then to obtain better collimation laser beam. The material is ZnSe and thus the red light can go through the beam expander. BEST-C Series 10.6um Adjustable Beam Expanders Part number MAG, x CA1,mm CA2,mm OD(D2),mm L1,mm Connection, mm BEST-10.4-2C 2 8 15 46 52.2 M30x1+M43x0.5 BEST-10.4-3C 3 8 15 46 81.5 M30x1+M43x0.5 www.SintecOptronics.com www.sintec.sg [email protected] [email protected] 4 BEST-10.4-4C 4 15 28 46 85 M30x1+M43x0.5 BEST-10.4-4C2 4 8 15 46 78 M30x1+M43x0.5 BEST-10.4-8C 8 8 32 46 81.5 M30x1+M43x0.5 BEST-H Series 10.6um Water-cooled Adjustable Beam Expanders Part number MAG, x CA1,mm CA2,mm OD(D2),mm L1,mm Connection, mm BEST-10.4-4H 4 8 33 54 101.5 M30x1 BEST-10.4-6H 6 10 33 54 101.5 M30x1 BEST-W Series Adjustable Beam Expanders Part No. MAG CA1 (mm) CA2 (mm) M1 D1 (mm) D2 (mm) L2(mm) L1(mm) BEST-10.6-2Z-TW 2 10 15 M16x0.75 22 22 37 51 BEST-10.6-2Z1-TW 2 10 23 M22x0.75 32 32 38 48 BEST-10.6-2ZG-TW 2 10 15 M16x0.75 22 22 40 51 BEST-10.6-2Z3-TW 2 15 28 M22x0.75 36 36 33 48 BEST-10.6-2Z4-TW 2 10 15 M16x0.75 20 20 37 50 BEST-10.6-2.5Z-TW 2.5 10 16 M16x0.75 20 20 45 55.2 BEST-10.6-2.5Z1-TW 2.5 10 15 M16x0.75 20 20 25 34 BEST-10.6-2.5Z2-TW 2.5 10 20 M22x0.75 28 28 40.5 56 BEST-10.6-3X3T-TW 3 10 16 M16x0.75 - 20 28 37 BEST-10.6-3Z1-TW 3 10 16 M16x0.75 20 20 45 61 BEST-10.6-3Z2-TW 3 10 20 M22x0.75 28 28 47 61 BEST-10.6-3Z3-TW 3 10 16 M16x0.75 20 20 28 37 BEST-10.6-3Z4/1-TW 3 10 25 M22x0.75 32 32 43 60 BEST-10.6-3Z5-TW 3 15 35 M22x0.75 44 44 60 73 BEST-10.6-3Z6-TW 3 15 28 M22x0.75 36 36 51 60 BEST-10.6-3.75Z-TW 3.75 23 26 M33x0.5 36 36 48 64 BEST-10.6-4X-TW 4 11 17 - M24x0.5 26 51.5 66 BEST-10.6-4Z-TW 4 10 16 M16x0.75 20 20 47 55 BEST-10.6-4Z1-TW 4 10 20 M22x0.75 28 28 55 71 www.SintecOptronics.com www.sintec.sg [email protected] [email protected] 5 BEST-10.6-4Z2-TW 4 15 28 M22x0.75 36 36 51 66 BEST-10.6-4Z3-TW 4 10 20 - 26 32 50 70 BEST-10.6-5Z-TW 5 10 16 M16x0.75 20 20 43 58 BEST-10.6-5Z1-TW 5 10 23 M22x0.75 30 30 56 71 BEST-10.6-6Z-TW 6 11 26 M22x0.75 32 32 62 76 BEST-10.6-6Z1-TW 6 10 35 M22x0.75 44 44 60 75 BEST-10.6-6Z2-TW 6 10 15 M16x0.75 20 20 45 60 BEST-10.6-8Z1-TW 8 10 33 M22x0.75 44 44 98 118 BEST-10.6-10Z1-TW 10 10 36 M22x0.75 44 44 98 118 BEST-X Series Beam Expanders Part No.
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