Sapphire Laser Window | High‑Power Sapphire Optical Window from Felix Glass
- Model
- FG-SLW-032
Item specifics
- Material
- Optical‑grade single‑crystal sapphire
- Crystal Orientation
- C‑plane, A‑plane, R‑plane by review
- Dimension
- Round, square, rectangular or drawing-based
- Tolerance
- Drawing-dependent; critical dimensions reviewed
- Surface Quality
- Commercial to optical scratch-dig specification
- Surface Flatness
- Project-specific at agreed test wavelength
- Transmission Band
- Typical uncoated material range: approx. 0.2-5.5 um
- Coating
- Uncoated, AR, BBAR or custom by review
- MOQ
- Prototype and batch quantities reviewed
- Custom Service
- OEM & ODM, drawing‑to‑part manufacturing
- Application
- High‑power laser, LiDAR, medical laser, aerospace, semiconductor, underwater ROV optics
Review
Description
Custom Sapphire Laser Window
Key Product Benefits
- Mohs 9 ultra‑hard substrate, strong scratch & impact resistance
- Excellent thermal conductivity, resist thermal cracking under high‑power CW / pulsed laser
- Broad transmission: 170 nm deep‑UV up to 5.5 µm mid‑infrared
- High LIDT for high‑energy laser operation
- Multiple AR anti‑reflection coating options
- Fully custom geometry: round, square, wedged, mounting holes per drawing
Product Detailed Description
Sapphire laser window is a critical protective optical element widely adopted in demanding laser systems. Different from ordinary fused silica optical glass, single‑crystal sapphire delivers superior mechanical strength, thermal stability and chemical inertness, solving common pain‑points such as window scratching, thermal fracture and short service life under harsh working environments.
Hong Kong Felix Optical Glass Co., Limited performs full in‑house manufacturing workflow: raw sapphire crystal selection, precision cutting, grinding, ultra‑precision optical polishing, strict cleaning, optical coating and final metrology inspection. Every sapphire laser optical window can be customized according to customer mechanical drawings and optical requirements.
Core Material Properties of Sapphire Substrate
| Parameter | Value |
|---|---|
| Spectral Transmission | 170 nm ~ 5.5 µm |
| Mohs Hardness | 9 |
| Melting Point | 2030 °C |
| Thermal Conductivity(c‑axis) | ~35 W/(m·K) |
| Density | 3.98 g/cm³ |
| Max Continuous Working Temperature | 1500 °C |
| Chemical Resistance | Inert to most chemicals(except hot phosphoric acid) |
Available Coating Options
- Uncoated: Broad‑band general application, zero risk of coating failure under extreme temperature.
- Single‑wavelength AR Coating: Optimized for 1064 nm,532 nm,355 nm,266 nm etc, average reflectivity <0.2%.
- Broadband AR Coating: UV‑VIS‑NIR multi‑wavelength anti‑reflection coating for multi‑band laser equipment.
- Wedged window coating: Eliminate etalon interference for beam‑sampling laser optics.
Typical LIDT for coated sapphire laser window: 5‑20 J/cm² @10 ns pulse. LIDT test report can be supplied for high‑energy laser projects upon request.
Technical Specifications
| Specification Item | Customizable Standard Range |
|---|---|
| Substrate | Synthetic single‑crystal sapphire Al₂O₃ |
| Size Range | 3 mm‑300 mm (round / square / special shape) |
| Thickness | 0.3 mm‑25 mm |
| Dimensional Tolerance | ±0.05 mm(tighter tolerance optional) |
| Surface Flatness | λ/2 ~ λ/10 @632.8 nm |
| Surface Quality | 60‑40,40‑20 MIL‑PRF‑13830 |
| Parallelism | ≤3 arcmin; high‑precision ≤10 arcsec optional |
| Wedge Angle | 0‑5 degrees customizable |
| Crystal Orientation | C‑plane / A‑plane / R‑plane custom |
| Edge Treatment | Fine‑ground, chamfer, polished edge |
| Mounting Feature | Through‑holes, counter‑sink holes, notches |
Typical Applications
- High‑power fiber laser, Nd:YAG, excimer laser cutting, marking & micro‑processing equipment
- Automotive & airborne LiDAR protective optical window
- Surgical & aesthetic medical laser devices
- Laboratory high‑energy femtosecond laser systems
- Semiconductor wafer inspection chamber viewports
- ROV underwater laser imaging & detection systems
- Aerospace UV‑MIR optical systems with wide temperature variation
Sapphire vs Fused Silica Window Material Comparison
| Performance | Sapphire Laser Window | Fused Silica Window |
|---|---|---|
| Mohs Hardness | 9, excellent scratch‑resistance | 5.5‑6.5, easy to scratch |
| Max Working Temperature | Up to 1500°C | ~1000‑1100°C |
| IR Transmission Cut‑off | ~5.5 µm | ~3.5 µm |
| Thermal‑Shock Resistance | Excellent | Good, inferior to sapphire |
| Birefringence | Yes(crystal‑orientation controllable) | None(isotropic glass) |
| Ideal Scenarios | High‑power, high‑temp, wear‑prone environment | Deep‑UV, low‑medium power, cost‑sensitive projects |
Suggestion: Choose sapphire for hundreds‑watt‑and‑above continuous‑wave laser or abrasive / high‑temperature working conditions.
Frequently Asked Questions
Q: Should I select sapphire or fused silica laser window?
A: Pick sapphire for high‑power laser, high‑temperature or abrasion‑prone environment. Fused silica fits deep‑UV, low‑to‑medium‑power cost‑oriented applications.
Q: Can you deliver LIDT test report for sapphire laser window?
A: Yes, test reports including LIDT, interferometer flatness, transmission spectrum are available on request, extra lead‑time applies.
Q: Can sapphire laser window be machined with mounting holes?
A: Yes, we process through‑holes, counter‑sink holes and notches based on customer drawings.
Q: What crystal orientation options do you support?
A: C‑plane, A‑plane, R‑plane sapphire substrates for polarization‑sensitive laser systems to manage birefringence impact.
Submit Custom Requirement
Please provide dimension, target wavelength, coating requirement, quantity and drawing. Hong Kong Felix Optical Glass Co., Limited will respond within 24 working hours.
