Optical Substrate: Schott N-BK7 borosilicate glass (standard reference 517642)
Surface Precision:
- λ/4 surface accuracy @ 632.8nm
- 60-40 scratch-dig specification
Coating Options: Broadband AR (MgF₂ or multilayer) for >99.5% peak transmission

2. Critical Properties

Optical Performance:
- >92% transmission (350nm–2.0μm uncoated)
- Abbe number 64.2 (minimizes chromatic aberration)
Thermal/Mechanical Stability:
- CTE: 7.1 × 10⁻⁶/K
- Knoop hardness: 610 kg/mm²
Precision Tolerances:
- Focal length: ±1%
- Center thickness: ±0.05 mm
- Centration: < 3 arcminutes

3. Core Functions

Beam Convergence: Short focal lengths (10–200mm) for high-power focusing
Aberration Correction: Bi-convex design reduces spherical distortion vs. plano-convex alternatives
Collimation: Converts point sources to parallel light for illumination systems
Image Magnification: 2X–20X capability for detailed inspection

4. Professional Applications

Microscopy Systems:
- Objective lenses in biological/industrial microscopes
- Condenser optics for Köhler illumination
Laser Tools:
- Focusing lenses for medical lasers (dermatology/surgery)
- Beam expanders in fiber laser cutters
Industrial Equipment:
- Barcode scanner optics
- Machine vision inspection lenses
Scientific Instruments:
- Telescope eyepieces
- Spectrometer collimators

Name	optical glass
Material	Optical Glass,Bk-7,Pyrex,Fused Silica,Sapphire,quartz
Diameter Tolerance	+0/-0.2 mm
Thickness Tolerance	+/-0.2 mm
Cler Aperture	over 90%
Flatness	^/4 @632.8nm
Surface Quality	80/50~10/5 scratch and dig
Transmission	above 92%
Chamfer	0.1-0.3 mm x 45 degree
Focal Length Tolerance	+/-2%
Back Focal Length Tolerance	+/-2%
Coating	available
Usage	opticl system, photographic sysem, Lighting system,Electronic apparatuse.g.laser,camera,monitor,projector,magnifier, telescope,polarizer,electronic instrument,led etc.

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