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Catalogue Catalog Ocean Optics

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Ocean Optics - 4802, 42221, 151346, 68207, 39626

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USB4000 Optical bench Options

Longpass Absorbing Filter

We offer longpass absorbing or blocking filters; each filter has a transmission band and a blocking band to restrict radiation to a certain wavelength region for eliminating second- and third-order effects. These filters are installed permanently between the slit and the clad mode aperture in the bulkhead of the SMA 905 Connector.


	Item	Description Price
	OF1-WG305	Longpass filter; transmits light >305 nm $50
	OF1-GG375	Longpass filter; transmits light >375 nm $50
	OF1-GG475	Longpass filter; transmits light >475 nm $50
	OF1-OG515	Longpass filter; transmits light >515 nm $50
	OF1-OG550	Longpass filter; transmits light >550 nm $50
	OF1-OG590	Longpass filter; transmits light >590 nm $50

Collimating & Focusing Mirrors

You can replace standard aluminum-coated reflective mirrors with our proprietary, UV-absorbing SAG+ Mirrors, which increase reflectance in the VIS-NIR and, in turn, increase the sensitivity of the spectrometer manufacturer. SAG+ Mirrors are often specified for fluorescence. These mirrors also absorb nearly all UV light, which reduces the effects of excitation scattering in fluorescence measurements. Unlike typical silver-coated mirrors, the SAG+ mirrors won't oxidize. They have excellent reflectivity more than 95% across the VIS-NIR. SAG+UPG: $250

SAG+ Mirror Reflectivity

100% 80% 60% 40%-20%

LU _1 LL

400 600 80^

WAVELENGTH (nm)

200

Choosing a Grating & Wavelength Range

Wide Selection Allows Flexibility

You choose from among 14 gratings for each spectrometer. With each grating, you consider its groove density (which helps determine the resolution), its spectral range (which helps determine the wavelength range) and its blaze wavelength (which helps determine the most efficient range).

Performance & Stability

Instead of the gratings rotating as they do in instruments such as scanning monochromators, our gratings are permanently fixed in place at the time of manufacture to ensure long-term performance and stability. (See page 18 for Grating Efficiency Curves.) A grating must be specified for each spectrometer. We offer ruled and holographic diffraction gratings. Both are polymer replicas of master gratings. There are trade-offs between these gratings: holographic gratings produce less stray light while ruled gratings are more reflective, resulting in higher sensitivity.

Grating Selection Chart

• The Groove Density (mm^-1) of a grating determines its dispersion, while the angle of the groove determines the most efficient region of the spectrum. The greater the groove density, the better the optical resolution possible, but the more truncated the spectral range.

• The Spectral Range is the dispersion of the grating across the linear array. The spectral range (bandwidth) is a function of the groove density and does not change. When you choose a starting wavelength for a spectrometer, you add its spectral range to the starting wavelength to determine the wavelength range.

• For ruled gratings, the Blaze Wavelength is the peak wavelength in an efficiency curve. For holographic

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Grating Number	Intended Use	Groove Density	Spectral Range	Blaze Wavelength	Best Efficiency (>30%)
1	UV	600	650 nm	300 nm	200-575 nm
2	UV-VIS	600	650 nm	400 nm	250-800 nm
3	VIS-Color	600	650 nm	500 nm	350-850 nm
4	NIR	600	625 nm	750 nm	530-1100 nm
5	UV-VIS	1200	300 nm	Holographic UV	200-400 nm
6	NIR	1200	200-270 nm	750 nm	500-1100 nm
7	UV-VIS	2400	100-140 nm	Holographic UV	200-500 nm
8	UV	3600	50-75 nm	Holographic UV	290-340 nm
9	VIS-NIR	1200	200-270 nm	Holographic VIS	400-800 nm
10	UV-VIS	1800	100-190 nm	Holographic UV	200-635 nm
11	UV-VIS	1800	120-160 nm	Holographic VIS	320-720 nm
12	UV-VIS	2400	50-120 nm	Holographic VIS	250-575 nm
13	UV-VIS-NIR	300	1700 nm	500 nm	300-1100 nm
14	NIR	600	625 nm	1000 nm	650-1100 nm

gratings, it is the most efficient wavelength region. The Best Efficiency region is the range where efficiency is >30%. In some cases, gratings have a greater spectral range than is efficiently diffracted. For example, Grating #1 has a 650 nm spectral range, but is most efficient from 200-575 nm. In this case, wavelengths >575 nm will have lower intensity due to the the grating's reduced efficiency.

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