Edmund Optics has introduced Techspec divergent adjustable (DA) fixed broadband beam expanders, optimised at a wide range of wavelengths for maximum flexibility, making them ideal for use with demanding tunable laser sources.
They feature a 1,940nm design wavelength to complement lasers with wavelengths from 1,900-2,100nm, which are ideal for highly precise applications including medical surgery and plastic processing because of their unique absorption characteristics and ability to create very small and precise cuts in both biological tissue and plastics with minimal localised heating.
Techspec DA broadband beam expanders are available in high and low power models with 2x and 3x magnifications. Low power models feature standard 7980 fused silica while high power models feature 7979 fused silica substrates to ensure minimal IR absorption within the substrate. A threaded barrel divergence adjustment compensates for input beam divergence. These beam expanders are coated for 1,900-2,100nm performance. They are easily integrated into prototype and advanced applications, and maintain the highest quality across the adjustment range. Techspec DA fixed broadband beam expanders are ideally suited for medical laser applications using highly tunable thulium and holmium sources.
The beam expanders offer λ/10 transmitted wavefront error and are manufactured using a fused silica substrate with excellent optical and thermal performance and stability. These optics feature broadband anti-reflection and laser line V-coatings for transmission >99 per cent.