
Reflection Filters
Select wavelengths by using 4 filter plates simultaneously. By tilting the plates the transmitted wavelength area can be selected with no change of the final beam direction.
Listed below are scanning range Δλ, half bandwidth HBW and transmission at peak maximum Tmax of standard REFs. The manufacturing of variable reflection filters is possible for a spectral range from 140 nm to 2000 nm.
Typically the scanning range is about 15% of the center wavelength, with rejection <10-4 from VUV to FIR and damage threshold similar to high power coatings.
LASEROPTIK offers two different housings to adjust the black filter plates (NG1) between AOI 15° and 60°:
– a manually driven unit, equipped with plates 50 x 50 x 1 mm, and
– a stepper motor driven unit, controlled manually or by PC, with 70 x 50 x 3 mm.
Please ask for more details.


- LP
- SP
- NF
- MP
- BP
- REF

Δλ [nm] | HBW [nm] | Tmax | method | type |
---|---|---|---|---|
180-200 | 12 | 80% | EBE | 1 |
235-275 | 18 | 90% | EBE | 1 |
40 | 95% | EBE | 2 | |
290-340 | 20 | 95% | EBE | 1 |
340-390 | 25 | 98% | MS | 1 |
500-585 | 30 | 98% | IAD | 1 |
750-880 | 60 | 98% | IAD | 1 |
1000-1150 | 60 | 95% | IAD | 1 |
All values are given for standard coatings. Customized coatings available for all types.
Coating methods available:





Examples
If not mentioned otherwise, all values and diagrams are given
... for the standard substrate material used in the described wavelength area (mostly Fused Silica or CaF2).
... without consideration of the rear surface.
... with EBE coating technique for a good cost-performance ratio.
Customized coatings are available for all types.
–––– dashed lines show the zoomed curve with the stated magnification

248 nm: R4 > 95%, compensation of manufacturing
tolerance for wavelength by angle tuning necessary.

266 nm: R4 > 95%, compensation of manufacturing
tolerance for wavelength by angle tuning necessary.

355 nm: R4 > 95%, compensation of manufacturing
tolerance for wavelength by angle tuning necessary.

532 nm: R4 > 98%, compensation of manufacturing
tolerance for wavelength by angle tuning necessary.

motor driven (left) [M-00012]
and manual adjustment [M-00042]
Every coating type can be optimized
for every
• substrate material
• wavelength
• reflection/transmis-
sion value
• angle of incidence
• polarization
• GDD value
• ...
Alternatively we can create
a totally new design for you.