Monochromatory

Bogaty wybór monochromatorów niewielkich rozmiarów, standardowych oraz systemów o wysokiej rozdzielczości.

Wszystkie dostępne modele można znaleźć tutaj.

Przegląd Monochromatorów i spektrografów

Model Focal

Length(mm)

Aperture Resolution

(nm)

Dispersion

(nm/mm)

SpecialFeatures
SMALL SERIES
9030 100 f/3.2 1 8 Compact Monochromator
8030DC 61 f/2 8-10 52.38 Dual Channel Compact Spectrograph
9030DA 100 f/3.2 0.5 4 Double Additive and Double Subtractive
9030DS 100 f/3.2 1.0 bandpass Effectively 0 Double Subtractive Monochromator
STANDARD SERIES
8010 200 f/3.5 0.5 4 Manual Spectrograph
9010 200 f/3.5 0.4 4 Manual Monochromator
9010F 200 f/2.6 1 4 Manual Monochromator
9055 200/250 f/3.5 0.18 3.3 Computer Controlled Monochromator/Spectrograph
9055F 200/250 f/2.5 0.4 3.3 Computer Controlled Monochromator/Spectrograph
9060 200 f/3.5f/2.7 0.15 3.3 Imaging Spectrograph
9057 500 f/8 0.1 1.79 Computer Controlled Monochromator/Spectrograph
9057F 500 f/5.9 0.1 1.79 Computer Controlled Monochromator/Spectrograph
9055DX 200 X 2

/ 250 x 2

F/3.5 0.1 1.79 Double Additive and Double Subtractive Monochromator
HIGH RESOLUTION SERIES
9040 496 f/6.9,f/5.2,f/4 0.03 1.53 High Resolution Half Meter
9040DA 500 x 2 f/6.9,f/5.2,f/4 0.02 0.76 Double Additive Half Meter
9040DS 500 f/6.9, f/5.2, f/4  0.03 bandpass  Effectively 0  Double Subtractive Meter
9490 914/1000 f/10,f/7 0.017 0.83 High Resolution One Meter
9490SD 914X2 f/10,f/7 0.42 Single and Double Pass
9150 1500 f/12 0.008 0.53 High Resolution1.5 Meter
9150SD 1500X2 f/12 0.005 1.25 Single and Double Pass
(9150X) 1.5m Single Echelle Spectrometer 1500 f/25 0.001 0.5 Single Pass CCD System
         

*ResolutionandDispersionvaluesmeasuredwitha1200lines/mmgrating

GRATING SELECTION

Grating selection is a crucial part of building a monochromator.  Each ruled or holographic grating is designed to diffract light most efficiently over a specific band of wavelengths.  Generally ruled gratings are designed with a ‘blaze’ wavelength at which the grating diffraction efficiency is a maximum.  Gratings also vary by the line density (ruled lines/mm).  The smaller a gratings line density is the larger the angular separation will be between two adjacent diffracted wavelengths.

A monochromator’s dispersion is a function of the monochromator’s focal length and the line density of the grating installed in the monochromator.

Generally each grating has a measured efficiency curve.  The efficiency curve is usually provided with the grating in Littrow condition.  Under Littrow condition the diffracted wavelength retraces the optical path of the incident radiation on the grating surface.  Sciencetech’s monochromators do not operate in Littrow condition therefore it should not be expected that the grating efficiency when installed in the monochromator will be exactly the same as the measured grating efficiency curve under Littrow condition.

MECHANICAL LIMITATIONS 

Sciencetech’s line of Standard and Hi-Res monochromators have similar mechanical limitations below is a list of mechanical limitations related to the Sciencetech 9055 monochromator.

Dispersion ~= 5000 / n ; Where n = grating lines/mm

Bandwidth based on:  Dispersion * 25.4mm wide array (important if using a LDA or CCD)

Resolution based on:  50um wide input slit * Dispersion 

Grating (l / mm) 75 150 300 600 1200 1800 2400
Dispersion (nm/mm) 66.6 33.3 16.7 8.3 4 2.8 2.1
Resolution (nm) 3.75 1.6 0.8 0.4 0.2 0.134 0.1
Bandwidth (nm) 1200 600 300 150 75 32.5 16.25
Maximum  Suggested Wavelength(nm) 13900 6950 3475 1737 868 579 434
Maximum Realistic Wavelength(nm) 21891 10945 5472 2736 1368 912 684
Maximum Wavelength Attainable(nm)** 25377 12688 6344 3172 1586 1057 793

 

** From sin(alpha) + sin(beta) = 10^-6 * k * n * lambda , where alpha = 90 degrees, beta = 90-25.4=64.6

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