Confirm the exact configuration
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.

Thorlabs
The Thorlabs BSF20-B1 is a discontinued Ø2" UV Fused Silica beam sampler with a thickness of 8 mm, designed for the 700-1100 nm wavelength range and released on September 3, 2003. This beam pick-off optic was officially discontinued on October 9, 2009, and has been superseded by the current replacement model BSF20-B. Submit the exact part number, quantity, and application requirements to request a quote for available stock or compatible alternatives.
Industrial and obsolete parts are priced per enquiry: the final price depends on available stock, condition, quantity, and your delivery destination, so a fixed list price would be misleading. Request a quote and we confirm current pricing, lead time, and sourcing options — including hard-to-find and discontinued Thorlabs references — within one business day.
For a faster response, include quantity, condition, and delivery destination.
Verified configuration
Engineering context
Use the manufacturer part number and model code—not appearance alone. Connection, size, material, voltage, pressure, seal, and control options can differ within the same product family.
Provide quantity, delivery country and ZIP/postal code, required condition, target date, and photographs of the existing nameplate when available.
Our sourcing response is prepared against Thorlabs BSF20-B1. Final compatibility remains subject to the machine manufacturer’s requirements and complete application data.