Semrock Master Catalog 2018
Semrock Master Catalog 2018
Semrock Master Catalog 2018
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Near Infrared Bandpass Filters<br />
Transmission (%)<br />
100<br />
90<br />
80<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
Center<br />
Wavelength<br />
1535 1550 1570<br />
0<br />
1500 1510 1520 1530 1540 1550 1560 1570 1580 1590 1600<br />
Wavelength (nm)<br />
Transmission &<br />
Bandwidth<br />
Design<br />
Spectra<br />
1535 nm > 90% over 3 nm 6.8 nm<br />
1550 nm > 90% over 3 nm 8.8 nm<br />
1570 nm > 90% over 3 nm 8.9 nm<br />
Nominal<br />
Full-width,<br />
Half-Maximum<br />
LDT specification = 1 J/cm² @1570 nm (10 ns pulse width)<br />
Measuring Light with Wavelengths and Wavenumbers<br />
The “color” of light is generally identified by the distribution<br />
of power or intensity as a function of wavelength λ.<br />
For example, visible light has a wavelength that ranges from<br />
about 400 nm to just over 700 nm. However, sometimes<br />
it is convenient to describe light in terms of units called<br />
“wavenumbers,” where the wavenumber w is typically<br />
measured in units of cm -1 (“inverse centimeters”) and is<br />
simply equal to the inverse of the wavelength:<br />
In applications like Raman spectroscopy, often both wavelength<br />
and wavenumber units are used together, leading to<br />
potential confusion. For example, laser lines are generally<br />
identified by wavelength, but the separation of a particular<br />
Raman line from the laser line is generally given by a<br />
“wavenumber shift” ∆w, since this quantity is fixed by the<br />
molecular properties of the material and independent of<br />
which laser wavelength is used to excite the line.<br />
200 300 400 500 600<br />
<strong>Semrock</strong>’s industry-leading ion-beam-sputtering manufacturing is now available for<br />
making optical filters with precise spectral features (sharp edges, passbands, etc.) at<br />
near-IR wavelengths, with features out to ~ 1700 nm, and high transmission to wavelengths<br />
> 2000 nm. The bandpass filters on this page are ideal as laser source clean-up filters<br />
and as detection filters which pass particular laser wavelengths and virtually eliminate<br />
background over the full InGaAs detector range (850 – 1750 nm). They are optimized for<br />
the most popular “retina-safe” lasers in the 1.5 μm wavelength range, where maximum<br />
permissible eye exposures are much higher than in the visible or at the 1.06 μm neodymium<br />
line. Applications include laser radar, remote sensing, rangefinding, and laser-induced<br />
breakdown spectroscopy (LIBS).<br />
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<br />
1550 nm, and Nd:YAG-pumped optical parametric oscillators (OPO’s) at 1570 nm.<br />
OD 5<br />
Blocking Range<br />
850 – 1519 nm<br />
1550 – 1750 nm<br />
850 – 1534 nm<br />
1565 – 1750 nm<br />
850 – 1554 nm<br />
1585 – 1750 nm<br />
When speaking of a “shift” from a first known wavelength λ 1<br />
to a second known wavelength λ 2<br />
, the resulting wavelength<br />
shift ∆λ is given by<br />
whereas the resulting wavenumber shift ∆w is given by<br />
When speaking of a known wavenumber shift ∆w from a<br />
first known wavelength λ 1<br />
, the resulting second wavelength<br />
λ 2<br />
is given by<br />
Note that when the final wavelength λ 2<br />
is longer than the<br />
initial wavelength λ 1<br />
, which corresponds to a “red shift,” in<br />
the above equations ∆w < 0, consistent with a shift toward<br />
smaller values of w. However, when the final wavelength λ 2<br />
is shorter than the initial wavelength λ 1<br />
, which corresponds<br />
to a “blue shift,” ∆w > 0, consistent with a shift toward<br />
larger values of w.<br />
Wavenumbers (cm -1 )<br />
50,000 33,333 25,000 20,000 16,667 14,286 12,500 11,111 10,000 9,091 8,333<br />
700<br />
Wavelength (nm)<br />
OD 6<br />
Blocking Range Part Number Price<br />
1412 – 1512 nm<br />
1558 – 1688 nm<br />
1426 – 1526 nm<br />
1573 – 1705 nm<br />
1444 – 1546 nm<br />
1593 – 1727 nm<br />
NIR01-1535/3-25 $610<br />
NIR01-1550/3-25 $610<br />
NIR01-1570/3-25 $610<br />
Except for the transmission, bandwidth, and blocking specifications listed above, all other specifications are identical to MaxLine ® specifications on page 99.<br />
TECHNICAL NOTE<br />
800 900 1000 1100 1200<br />
NIR Filters Mirrors Polarizers<br />
Edge<br />
Filters<br />
Dichroic<br />
Beamsplitters<br />
Laser-line<br />
Filters<br />
Laser Diode<br />
Filters<br />
Notch<br />
Filters<br />
Lamp Clean-up<br />
Filters<br />
UV<br />
Near-UV<br />
Visible<br />
Near-IR<br />
101<br />
More