Semrock Master Catalog 2018

StopLine ® Single-notch Filter Common Specifications
Property Value Comment
Laser Line
Blocking:
Typical 50%
Notch Bandwidth
E- & U-grade > 6 OD
E- & U-grade
NBW = 55 × 10 –6 2
× λ L
+ 14 × 10 –3 ×λ L
– 5.9
e.g. 17 nm (600 cm –1 ) for 532.0 nm filter
All other General Specifications are the same as the RazorEdge ® specifications on page 95.
At the design laser wavelength;
OD = - log 10
(transmission)
Full width at 50% transmission;
λ L
is design laser wavelength
(NBW and λ L
in nm)
Maximum 50% Notch Bandwidth < 1.1 × NBW
90% Notch Bandwidth < 1.3 × NBW Full width at 90% transmission
Passband
E-grade 350 –1600 nm Excluding notch
U-grade from 0.75 × λ L
to λ L
/ 0.75
λ L
is design laser wavelength (nm)
Average
Passband
Transmission
E-grade > 80% 350 – 400 nm, > 93% 400 – 1600 nm Excluding notch
U-grade > 90%
Lowest wavelength is 330 nm for NF03-405E
Passband Transmission Ripple < 2.5% Calculated as standard deviation
Angle of Incidence 0.0° ± 5.0° See technical note on page 105
Angle Tuning Range [1]
- 1% of laser wavelength
(- 5.3 nm or + 190 cm –1 for 532 nm filter)
Wavelength “blue-shift” attained by
increasing angle from 0° to 14°
Laser Damage Threshold 1 J/cm 2 @ 532 nm (10 ns pulse width) Tested for 532 nm filter only (see page 108)
Coating Type
“Hard” ion-beam-sputtered
Clear Aperture ≥ 22 mm For all optical specifications
Outer Diameter 25.0 + 0.0 / - 0.1 mm Black-anodized aluminum ring
Overall Thickness 3.5 ± 0.1 mm Black-anodized aluminum ring
[1]
For small angles q (in degrees), the wavelength shift near the laser wavelength is D l (nm) = - 5.0 × 10 –5 × l L
× q 2 and the wavenumber
shift is D(wavenumbers) (cm –1 ) = 500 × q 2 / l L
, where l L
(in nm) is the laser wavelength. See Technical Note on wavenumbers on page 101.
PRODUCT NOTE
Notch Filters
Notch filters are ideal for applications that require nearly complete
rejection of a laser line while passing as much non-laser light as possible.
Hard-coated thin-film notch filters offer a superior solution due to their
excellent transmission (> 90%), deep laser-line blocking (OD > 6) with a
narrow notch bandwidth (~ 3% of the laser wavelength), environmental
reliability, high laser damage threshold (> 1 J/cm 2 ), and compact format
with convenient back-reflection of the rejected laser light. However,
until now, the main drawback of standard thin-film notch filters has been
a limited passband range due to the fundamental and higher-harmonic
spectral stop bands (see red curve on graph at right).
To achieve a wider passband than standard thin-film notch filters
could provide, optical engineers had to turn to “holographic” or
0
400 500 600 700 800 900 1000 1100
“Rugate” notch filters. Unfortunately, holographic filters suffer from
Wavelength (nm)
lower reliability and transmission (due to the gelatin-based, laminated
structure), higher cost (resulting from the sequential production process), and poorer system noise performance and/or higher
system complexity. Rugate notch filters, based on a sinusoidally varying index of refraction, generally suffer from lower
transmission, especially at shorter wavelengths, and less deep notches.
0
Semrock E-grade StopLine notch filters offer a breakthrough in optical notch filter technology, bringing together all the
advantages of hard-coated standard thin-film notch filters with the ultrawide passbands 2 that were previously possible only with
holographic and Rugate notch filters. The spectral performance of the E-grade StopLine filters is virtually identical to that of
3
Semrock’s renowned U-grade StopLine filters, but with passbands that extend from the UV (< 350 nm) to the near-IR (> 1600 nm).
Transmission (%)
Optical Density
100
90
80
70
60
50
40
30
20
10
1
4
5
6
NF03-532E
NF01-532U
Typical
measured
spectral data
NF03-532E
Typical
measured
spectral data
NIR Filters Mirrors Polarizers
Edge
Filters
Dichroic
Beamsplitters
Laser-line
Filters
Laser Diode
Filters
Notch
Filters
Lamp Clean-up
Filters
7
490 500 510 520 530 540 550 560 570 580
Wavelength (nm)
103
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