BSL Beam Expanders
ULO Optics
BSL17/130~BSL17/400
The BSL17 series are a set of compact and economical beamexpanders for use with small or medium size CO2 lasers, such as Synrad, and Coherent ‘Diamond’ lasers.
The output clear aperture is 35.0mm diameter, and models from the BSL17 range are useful for expanding the beam to a limit of about 25mm (1/e2) output diameter.
A slide-and-lock type focus mechanism eliminates rotation of the lenses and beam wander during focusing (assuming the input beam is correctly aligned).
Models from BSL17 series are intended for use up to 500W CW power.
| Part Number | Mag | Physical Input Aperture | Approx Max Input Beam Dia. |
| BSL17/130 | 1.3 | 19mm | 13mm |
| BSL17/150 | 1.5 | 19mm | 13mm |
| BSL17/200 | 2.0 | 19mm | 13mm |
| BSL17/250 | 3.0 | 19mm | 10mm |
| BSL17/300 | 3.5 | 19mm | 9 mm |
| BSL17/350 | 4.0 | 19mm | 7 mm |
| BSL17/400 | 4.5 | 19mm | 6 mm |
| Construction (Mech.) | Aluminium alloy, black anodised, with laser-engraved legends/focus scale |
| Construction (Optical) | Lasergrade ZnSe lenses, with low-absorption anti-reflection coatings for 10.6μm |
| Focus range | -1m through infinity to +1m |
| Fittings | 38.0 mm dia x 1.0 pitch male thread |
| Operation | Manual slide focus, with lock screw |
| Cooling | Air-cooled |
| Output clear aperture | 35.0mm diameter, all models |
| Transmission | >98.5% (assumes zero beam clipping) |
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