Raytools BM111 100mm collimating lens - shapes the diverging fiber beam into a parallel column - keeps beam alignment accurate for stable, consistent cutting
On a BM111 head, most operators troubleshoot dull cuts or reduced power by checking the focusing lens first - but if the collimating lens behind it isn't shaping the beam correctly, the focusing lens can never fully make up for it. This is the genuine Raytools BM111 collimating lens, 100 mm focal length, the optic positioned at the beam input side that converts the diverging fiber output into a parallel beam before it travels down to the focusing stage. It's currently in stock and dispatches within 1-3 business days from our Ahmedabad warehouse, with delivery across India.
The BM111 shares a similar optical layout with other Raytools BM series heads, but its collimating lens is matched specifically to the BM111's internal path length - it isn't the same part as the BM110 version, even though both use a 100 mm focal length. This lens is made from fused silica with anti-reflective coating on both faces for high-power fiber laser wavelengths, and it sits close enough to full beam power that coating quality and thermal stability matter as much as the focal length itself. Over months of continuous cutting, even a genuine lens will eventually need replacement - the goal with a genuine part is that it degrades predictably and stays within spec until then, instead of drifting early and quietly costing you cut quality.
Specifications
Specification
Detail
Focal length
100 mm
Material
Fused silica (quartz)
Coating
AR-coated both faces, tuned for 1064-1080 nm
Function
Collimates diverging fiber output into a parallel beam
Position in head
Beam input side, before the focusing lens
Head compatibility
Raytools BM111
Stock status
In stock, ships in 1-3 business days
Why This Lens Affects Cut Quality More Than It Seems
The collimating lens is easy to overlook because it's not the optic sitting right above the nozzle - but everything the focusing lens does depends on the beam it receives from here. On the BM111, if this lens is scratched, coated unevenly, or simply the wrong focal length for the head, the beam reaching the focusing lens is already slightly distorted. In practice this usually shows up as a bigger kerf than expected, slower or unreliable piercing on thicker sheet, or a cut edge that looks "soft" even though the machine's power and speed settings haven't changed.
Signs You Need to Replace It
Kerf width has crept up compared to your usual baseline
Piercing takes longer or fails intermittently on thicker material
Edge quality drops even with parameters unchanged
Effective power feels lower than the head's rated capability
Visible haze, spotting, or coating wear on the lens surface
Adjusting focus no longer brings back your usual cut quality
Features & Benefits
Features
Genuine Raytools BM111 collimating lens, 100 mm focal length, fused-silica substrate, dual-side AR coating for high-power fiber laser use, matched precisely to the BM111's optical path.
Benefits
Restores accurate beam collimation for a tighter focal spot, improves edge quality and piercing consistency, reduces the chance of chasing cut-quality problems that actually trace back to this lens, and keeps performance predictable between replacements.
Genuine Raytools Lens vs Generic Lens
Parameter
Genuine Raytools (this product)
Generic / Unbranded
Substrate
High-purity fused silica
Mixed-grade, often undocumented
AR coating
Tuned for 1064-1080 nm, both faces
Inconsistent, sometimes single-face only
Focal length accuracy
Exact 100 mm, matched to BM111 path
Tolerance drift affects focus spot
Thermal stability
Rated for continuous high-power use
Prone to thermal lensing over time
Fitment
Exact BM111 housing fit
Tolerance mismatches common
Why Order This From Us
Genuine Raytools optics - not relabeled or mixed-source glass
In stock right now - dispatched in 1-3 business days
GST-registered supplier (GSTIN 24AFSFS3212F1Z2) with proper invoicing
Ahmedabad-based warehouse with pan-India courier reach
WhatsApp support to confirm head model and fitment before you order
Bulk pricing for job-work shops and fabrication units
Frequently Asked Questions
It takes the diverging beam from the fiber and shapes it into a parallel beam before it reaches the focusing lens, which directly affects focal spot size and cut quality.
Both use a 100 mm focal length, but they are matched to different head bodies with different internal path lengths. Always confirm your exact head model before ordering.
The collimating lens sits near the beam input and shapes the raw beam into a parallel column. The focusing lens sits near the nozzle and converges that beam onto the material. Both need to be in good condition for a clean cut.
Common signs are a wider kerf than normal, slower or failed piercing, reduced effective power, and cut quality that focus adjustments no longer fix.
Yes, this is a genuine Raytools BM111 collimating lens, not a generic replacement.
It's in stock and dispatches within 1-3 business days, with courier delivery across India.
Yes, every order ships with a proper GST invoice for your records.
Yes, bulk pricing is available - message us on WhatsApp with your quantity for the best rate.
In stock, dispatched in 1-3 business days, with GST invoice and pan-India delivery. Message us on WhatsApp if you'd like your head model confirmed before ordering, or request a quote for bulk quantities.
