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Catalogue Catalog Ocean Optics

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Options for the "HR"

Optical bench

Longpass Absorbing Filters

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

Another bench option is to replace the 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

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light, which reduces the effects of excitation scattering in fluorescence measurements. Unlike most silver-coated mirrors, the SAG+ mirrors won't oxidize. See page 16 for a spectral graph illustrating SAG+ reflectivity. SAG+UPG-HR: $250

Choosing a Grating & Wavelength Range


Grating Number	Intended Use	Groove Density	Spectral Range	Blaze Wavelength	Best Efficiency (>30%)
HC1*	UV-NIR	300	200-1100 nm	variable	200-1100	nm
H1	UV	600	425-445 nm	300 nm	200-575 nm
H2	UV-VIS	600	415-445 nm	400 nm	250-800 nm
H3	VIS-Color	600	410-440 nm	500 nm	350-850 nm
H4	NIR	600	410-430 nm	750 nm	530-1100	nm
H5	UV-VIS	1200	205-220 nm	holographic: UV	200-400 nm
H6	NIR	1200	140-195 nm	750 nm	500-1100	nm
H7	UV-VIS	2400	72-102 nm	holographic: UV	200-500 nm
H9	VIS-NIR	1200	165-205 nm	holographic: VIS	400-800 nm
H10	UV-VIS	1800	95-140 nm	holographic: UV	200-635 nm
H11	UV-VIS	1800	75-135 nm	holographic: VIS	320-800 nm
H12	UV-VIS	2400	60-100 nm	holographic: VIS	250-575 nm
H13	UV-VIS-NIR	300	900 nm	500 nm	300-1100	nm
H14	NIR	600	410-420 nm	1000 nm	650-1100	nm

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). Our gratings are permanently fixed in place at the time of manufacture to ensure long-term performance and stability. We offer ruled and holographic

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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

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.

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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

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grating's reduced efficiency.

Grating Efficiency Curves for the

HC-1 Grating Efficiency Curve

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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 gratings, it is the most efficient wavelength region.

"HR" bench are

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the same as those

for the USB (see

page 1 8) except

for the HC-1

Grating; its curve

is shown here. All

2 0 300 400 500 600 700 800 900 1000 1100 WAVELENGTH (nm)

gratings are free with the purchase of a spectrometer, except for the HC-1, which is $600.

Tel: 727.733.2447 • Email: Info@OceanOptics.com