HTLM25 Precision Lens Mount for 25 mm and 25.4 mm Diameter Optical Lenses

Overview

The HTLM25 is a precision-engineered optical lens mount designed for stable, repeatable alignment of plano-convex, biconvex, meniscus, and other rotationally symmetric lenses with diameters of 25 mm or 25.4 mm (1 inch). Constructed from high-stiffness, anodized 6061-T6 aluminum alloy, the mount features a kinematically optimized three-point contact clamping mechanism that minimizes radial stress-induced wavefront distortion while maintaining centration accuracy within ±3 µm. Its fixed-mount architecture eliminates adjustment drift under vibration or thermal cycling—critical for interferometric setups, collimation systems, and laser cavity alignment where long-term positional stability directly impacts beam quality and measurement reproducibility. The standard 25.4 mm optical axis height ensures seamless integration with industry-standard optical tables, breadboards, and cage system platforms (e.g., Thorlabs 30 mm and 60 mm cages, or OptoSigma C-series rails).

Key Features

• Bi-compatible bore design accommodating both metric (25 mm) and imperial (25.4 mm) lens diameters without adapter rings—reducing inventory complexity and alignment uncertainty.
• Integrated M4 and M6 threaded holes on base plate for rigid mounting to optical tables, posts, or custom fixtures; compatible with standard post holders (e.g., PH3, PH6) and translation stages.
• Non-marring, spring-loaded nylon-tipped set screws provide uniform radial pressure distribution—preventing surface scratching and edge chipping on coated or fragile substrates (e.g., MgF₂-, AR-, or V-coated fused silica lenses).
• Black anodized finish (Type II, 15–20 µm thickness) delivers corrosion resistance, low outgassing (<1.0 × 10⁻⁶ g/cm²·hr per ASTM E595), and reduced stray light reflectance (<5% at 532 nm).
• Manufactured to ISO 2768-mK general tolerances; centering error ≤ ±3 µm; runout < 5 µm per 10 mm axial length (verified via autocollimator and coordinate measuring machine).

Sample Compatibility & Compliance

The HTLM25 supports plano-optical elements up to 50 mm in clear aperture (CA), including BK7, SF10, CaF₂, UV-grade fused silica, and IR-transmissive materials such as ZnSe and Ge (with appropriate thermal expansion compensation). It is routinely deployed in Class 1000 cleanroom environments and meets mechanical interface requirements of ISO 10110-7 (surface form tolerances) and SEMI F21 (cleanroom compatibility). While not a regulated medical or aerospace device, its production adheres to ISO 9001:2015 quality management standards, and dimensional traceability is maintained through NIST-traceable calibration of CNC machining centers and CMMs.

Software & Data Management

As a passive mechanical component, the HTLM25 requires no firmware, drivers, or software integration. However, it is fully compatible with optical design and alignment workflows using Zemax OpticStudio, CODE V, and FRED. Mounting coordinates and tolerance stack-ups can be exported in STEP AP214 format for GD&T analysis and assembly simulation. For GLP/GMP-aligned labs, batch-specific certificates of conformance—including material lot numbers, surface roughness (Ra ≤ 0.8 µm), and inspection reports—are available upon request.

Applications

• Laser diode collimation assemblies in fiber coupling stations
• Reference arm mounts in Michelson and Mach–Zehnder interferometers
• Beam expander and telescope objective positioning in alignment jigs
• Fixed-lens stages for spectral calibration sources (e.g., tungsten-halogen or LED-based radiometers)
• Education kits for undergraduate optics laboratories (e.g., ray tracing, aberration demonstration, and diffraction experiments)

FAQ

Can the HTLM25 accommodate lenses thicker than 20 mm?
Yes—maximum lens thickness supported is 25 mm, provided edge clearance between lens rim and mount flange exceeds 0.3 mm to avoid mechanical interference.

Is vacuum compatibility verified?
The mount has been tested to 1 × 10⁻⁵ Torr for 72 hours with no measurable outgassing or dimensional shift; however, bake-out above 80 °C is not recommended due to anodize layer limitations.

Does HT offer custom engraving or OEM branding?
Yes—laser etching of serial numbers, part IDs, or customer logos is available under minimum order quantities (MOQ = 50 units) and subject to drawing approval.

What is the maximum torque specification for the clamping screws?
0.35 N·m maximum—exceeding this may deform the clamping ring and compromise centration repeatability.

Are replacement nylon tips available separately?
Yes—part number HTLM25-TIP-NYLON (pack of 10) is stocked and shipped with RoHS-compliant certification.