Semrock Master Catalog 2018

Near Infrared Bandpass Filters
Transmission (%)
100
90
80
70
60
50
40
30
20
10
Center
Wavelength
1535 1550 1570
0
1500 1510 1520 1530 1540 1550 1560 1570 1580 1590 1600
Wavelength (nm)
Transmission &
Bandwidth
Design
Spectra
1535 nm > 90% over 3 nm 6.8 nm
1550 nm > 90% over 3 nm 8.8 nm
1570 nm > 90% over 3 nm 8.9 nm
Nominal
Full-width,
Half-Maximum
LDT specification = 1 J/cm² @1570 nm (10 ns pulse width)
Measuring Light with Wavelengths and Wavenumbers
The “color” of light is generally identified by the distribution
of power or intensity as a function of wavelength λ.
For example, visible light has a wavelength that ranges from
about 400 nm to just over 700 nm. However, sometimes
it is convenient to describe light in terms of units called
“wavenumbers,” where the wavenumber w is typically
measured in units of cm -1 (“inverse centimeters”) and is
simply equal to the inverse of the wavelength:
In applications like Raman spectroscopy, often both wavelength
and wavenumber units are used together, leading to
potential confusion. For example, laser lines are generally
identified by wavelength, but the separation of a particular
Raman line from the laser line is generally given by a
“wavenumber shift” ∆w, since this quantity is fixed by the
molecular properties of the material and independent of
which laser wavelength is used to excite the line.
200 300 400 500 600
Semrock’s industry-leading ion-beam-sputtering manufacturing is now available for
making optical filters with precise spectral features (sharp edges, passbands, etc.) at
near-IR wavelengths, with features out to ~ 1700 nm, and high transmission to wavelengths
> 2000 nm. The bandpass filters on this page are ideal as laser source clean-up filters
and as detection filters which pass particular laser wavelengths and virtually eliminate
background over the full InGaAs detector range (850 – 1750 nm). They are optimized for
the most popular “retina-safe” lasers in the 1.5 μm wavelength range, where maximum
permissible eye exposures are much higher than in the visible or at the 1.06 μm neodymium
line. Applications include laser radar, remote sensing, rangefinding, and laser-induced
breakdown spectroscopy (LIBS).
Near-IR bandpass filters are a good match for Er-doped fiber and Er-doped glass lasers at 1535 nm, r-doped fiber and InGaAsP semiconductor lasers at
1550 nm, and Nd:YAG-pumped optical parametric oscillators (OPO’s) at 1570 nm.
OD 5
Blocking Range
850 – 1519 nm
1550 – 1750 nm
850 – 1534 nm
1565 – 1750 nm
850 – 1554 nm
1585 – 1750 nm
When speaking of a “shift” from a first known wavelength λ 1
to a second known wavelength λ 2
, the resulting wavelength
shift ∆λ is given by
whereas the resulting wavenumber shift ∆w is given by
When speaking of a known wavenumber shift ∆w from a
first known wavelength λ 1
, the resulting second wavelength
λ 2
is given by
Note that when the final wavelength λ 2
is longer than the
initial wavelength λ 1
, which corresponds to a “red shift,” in
the above equations ∆w < 0, consistent with a shift toward
smaller values of w. However, when the final wavelength λ 2
is shorter than the initial wavelength λ 1
, which corresponds
to a “blue shift,” ∆w > 0, consistent with a shift toward
larger values of w.
Wavenumbers (cm -1 )
50,000 33,333 25,000 20,000 16,667 14,286 12,500 11,111 10,000 9,091 8,333
700
Wavelength (nm)
OD 6
Blocking Range Part Number Price
1412 – 1512 nm
1558 – 1688 nm
1426 – 1526 nm
1573 – 1705 nm
1444 – 1546 nm
1593 – 1727 nm
NIR01-1535/3-25 $610
NIR01-1550/3-25 $610
NIR01-1570/3-25 $610
Except for the transmission, bandwidth, and blocking specifications listed above, all other specifications are identical to MaxLine ® specifications on page 99.
TECHNICAL NOTE
800 900 1000 1100 1200
NIR Filters Mirrors Polarizers
Edge
Filters
Dichroic
Beamsplitters
Laser-line
Filters
Laser Diode
Filters
Notch
Filters
Lamp Clean-up
Filters
UV
Near-UV
Visible
Near-IR
101
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