Fabrication and characterization of microlenses made of tellurite and heavy metal oxide glass developed with hot embossing technology

Kasztelanic, R., Kujawa, I., Stępień, R., Cimek, J., Haraśny, K., Klimczak, M., Waddie, A.J., Taghizadeh, M.R., Buczyński, R.

Optical and Quantum Electronics

46 (4), 2014, 541–552, 10.1007/s11082-013-9811-0

In this paper we describe the work on application of hot embossing process to fabrication of micro-optical elements transmitting in the visible, near infrared and mid-infrared part of spectrum, using multi-component soft glasses as starting materials. Description of used hot embossing (HE) process is provided, followed by discussion of rheological and viscosity properties of several glass types considered for demonstrator fabrication experiment. Demonstrator microlenses were fabricated from lead-bismuth-gallium oxide (PBG08) and tellurite glasses (TWPN/I/6), with transmission windows extending from the visible up to the mid-infrared (up to around 6.5μm). Fabricated elements, which included diffractive and refractive lenses and lens arrays, were examined in context of homogeneity (quality of pattern replication) and obtained optical properties (M2, focal length, resolution). A demonstrator microscope objective was constructed using refractive plano-concave, plano-convex and biconvex lenses fabricated with the HE setup and its optical characteristics were provided.