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Dielectric Mirror, Laser Line, Zerodur, 50.8 mm, λ/10, 1520-1580nm

The 20Z20DM.8 Laser Line Dielectric mirror is a highly efficient reflector optimized for a narrow 1520 to 1580 nm wavelength range. This 2 inch (50.8 mm) diameter mirror is made from a 12.7 mm thick Zerodur substrate. Zerodur is a glass-ceramic material where thermal expansion is nominally zero. This extra stability can be critical for applications requiring diffraction limited performance. The DM.8 coating is designed for use with diode lasers and has a center wavelength of 1550 nm. The coating achieves greater than 99% reflectance, from 0–45° angle of incidence, for any polarization. This multilayer dielectric coating is extremely durable, making it resistant to damage from repeated cleaning. This mirror has a λ/10 surface flatness and a 15-5 surface quality.

Specifications

Technical Specs

Wavelength Region
IR
Wavelength Range
1520-1580 nm
Mirror Shape
Round
Diameter
50.8 mm
Material
Zerodur^® or equivalent
Coating Type
Laser Line Dielectric
Coating Code
DM.8
Reflectivity
R_s, R_p>99% @ 1520-1580 nm
Surface Quality
15-5 scratch-dig
Surface Flatness
λ/10 at 632.8 nm
Substrate Number
20Z20
Angle of Incidence
0-45°

Clear Aperture
≥central 80% of diameter
Back Surface
Ground
Thickness
12.7 mm
Thickness Tolerance
±0.25 mm
Diameter Tolerance
+0/-0.13 mm
Chamfers
0.38–1.14 mm face width
Chamfers Angle Tolerance
45° ±15°
Cleaning
See How to Clean Optics
Damage Threshold
500 W/cm² CW, 10 J/cm² for 10 nsec pulses @ 1540 nm

Wavelength Region
IR
Wavelength Range
1520-1580 nm
Mirror Shape
Round
Diameter
50.8 mm
Material
Zerodur^® or equivalent
Coating Type
Laser Line Dielectric
Coating Code
DM.8
Reflectivity
R_s, R_p>99% @ 1520-1580 nm
Surface Quality
15-5 scratch-dig
Surface Flatness
λ/10 at 632.8 nm
Substrate Number
20Z20
Angle of Incidence
0-45°

Clear Aperture
≥central 80% of diameter
Back Surface
Ground
Thickness
12.7 mm
Thickness Tolerance
±0.25 mm
Diameter Tolerance
+0/-0.13 mm
Chamfers
0.38–1.14 mm face width
Chamfers Angle Tolerance
45° ±15°
Cleaning
See How to Clean Optics
Damage Threshold
500 W/cm² CW, 10 J/cm² for 10 nsec pulses @ 1540 nm

Resources & Downloads

Other

20Z20DM.8 RoHS Certificate(264.4 kB, PDF)
DM.8 Raw Data.xlsx(57.3 kB, XLSX)

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