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Options for the "QE" Optica! Bench

Choosing a Grating & Wavelength Range

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).

• The Groove Density (mm^-1) of a grating determines its dispersion, while the angle of the groove determines the

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 so wavelengths >575 nm will have lower intensity.

most efficient region of the spectrum. The greater the groove density, the better the optical resolution possible, but the more truncated the spectral range.

Grating Efficiency Curves are on the next page. (The HC-1 curve is on page 23.) All gratings are free with the purchase of a spectrometer, except for the HC1-QE, which is $600.


Grating Number	Intended Use	Groove Density	Spectral Range	Blaze Wavelength	Best Efficiency (>30%)
HC1-QE	UV-NIR	300	200-950 nm	variable	200-950 nm
H1	UV	600	373-390 nm	300 nm	200-575 nm
H2	UV-VIS	600	365-390 nm	400 nm	250-800 nm
H3	VIS-Color	600	360-386 nm	500 nm	350-850 nm
H4	NIR	600	360-377 nm	750 nm	530-1100 nm
H5	UV-VIS	1200	180-193 nm	holographic: UV	200-400 nm
H6	NIR	1200	123-170 nm	750 nm	500-1100 nm
H7	UV-VIS	2400	63-90 nm	holographic: UV	200-500 nm
H9	VIS-NIR	1200	145-180 nm	holographic: VIS	400-800 nm
H10	UV-VIS	1800	83-123 nm	holographic: UV	200-635 nm
H11	UV-VIS	1800	66-120 nm	holographic: VIS	320-800 nm
H12	UV-VIS	2400	52-88 nm	holographic: VIS	250-575 nm
H13	UV-VIS-NIR	300	790 nm	500 nm	300-1100 nm
H14	NIR	600	360-370 nm	1000 nm	650-1100 nm

• 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

(D P (D

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0 (D

a CD

holographic gratings, it is the most efficient wavelength region.

Back-thinned Area Detector

The QE65000's Hamamatsu S7031-1006 FFT-CCD area detector provides 90% quantum efficiency (defined as how efficiently a photon is converted to a photoelectron). The TE-cooled detector features low noise and low dark signal, which enables low-light-level detection and long integration times, thus achieving a wide dynamic range.

Efficiency

Quantum

Detector

The S7031 is a 2D array, which allows us to bin pixels in a vertical column to acquire light from the entire height of the spectrometer's slit image. This improves light collection and signal-to-noise significantly. Because the detector is back-thinned (or back-illuminated), it has great native response in the UV and does not require the UV detector upgrade that we apply to other detectors.

In our spectrometers with linear CCDs, the slit's width, not its height, regulates the amount of light entering the bench because linear CCDs cannot efficiently collect the light from the entire height of the slit. But in the QE65000, the 2D area detector can better take advantage of the height of the entrance slit and the additional light, greatly improving system sensitivity.

Detector with OFLV Filter

The OFLV-QE is one of our Variable Longpass Order-sorting Filters used to eliminate second-order effects and is used with an HC-1 Grating in a 200-950 nm wavelength range system in a QE65000. We use patented coating technology to apply the filter onto the substrate of the detector's window. OFLV-QE: $250

100

SÄ

Typical linear CCD

60 -

20 -

200 400 600 80o l0oT 12V

WAVELENGTH (nm)



	Detector:	Hamamatsu S7031-1006 area CCD
	Detector range:	200-1100 nm
	Pixels:	1024 x 58 (1044 x 64 total); 24.6 urn square size
	Pixel area:	active area: 24.576 mm x 1.392 mm
	Pixel well depth: 300,000 electrons/well; ~1.5 million electrons/column sum well
	Sensitivity:	400 nm: 22 electrons/count; 250 nm: 26 photons/count
	Dark current:	4000 e^-/pixel/sec @ 25 °C; 200 e^-/pixel/sec @ 0 °C

For a!! your sensing needs, visit OceanOptics.com