Monochromator and Spectrographs

Sciencetech offers a wide variety of standard monochromators in Seya-Namioka optical layout and Czerny-Turner configuration. We have Small Series Monochromators, Standard Series Monochromators and High Resolution Series Monochromators. See the Monochromators and Spectrographs Table to compare Sciencetech monochromators across different product lines.

  

Monochromator-small-series Monochromator-Standard-Series Monochromator-Hight-Resolution
 Small Series Monochromators  Standard Series Monochromators

 High Resolution Series Monochromators


Monochromators Models


Sciencetech design and fabricate more than twenty different variants of monochromators; as shown in the following table. Some Sciencetech monochromators models have a computer controlled interchangeable 3-grating turret for automatic grating and wavelength selection:

 

Model Focal Length
(mm)
F / # *Resolution
(nm)
*Dispersion
(nm / mm)
Turret Configuration Special Features
Small Series Monochromators
9030 100 F/3.2 1 8 Single Grating
32 x 32 mm
Compact Monochromator
9030DA 100 x 2 F/3.2 0.5 4 Single Grating
32 x 32 mm
Double Additive
9030DS 100 x 2 F/3.2 1 Effectively 0 Single Grating
32 x 32 mm
Double Subtractive
9072S 125 F/3.5 0.4 7 Single Grating
30 x 30 mm
Motorized Compact Monochromator
9072DA 125 x 2 F/3.5 0.2 3.5 Single Grating
30 x 30 mm
Double Additive
9072DS 125 x 2 F/3.5 0.4 Effectively 0 Single Grating
30 x 30 mm
Double Subtractive
Standard Series Monochromators
9055 250 F/3.5 0.2 4 Triple Grating
50 x 50mm
Motorized Monochromator / Spectrograph
9055F 250 F/2.5 0.4 3.3 Double Grating
64 x 64mm
Fast Version Motorized Monochromator / Spectrograph
9055i 250 F/3.5 0.15 4 Triple Grating
50mm x 50mm
Imaging Spectrograph / Fast Version Motorized Monochromator / Spectrograph
9055DX 250 x 2 F/3.5 0.1 1.7 Triple Grating
50 x 50mm
Motorized Double Additive / Subtractive
9055DX-I 250 x 2 F/3.5 0.09 1.7 Triple Grating
50 x 50mm
Motorized Imaging Monochromator / Spectrograph
9057 457 F/8 0.2 1.79 Triple Grating
50 x 50mm
Half Meter Monochromator / Spectrograph
9057i 457 F/8 0.1 1.79 Triple Grating
50 x 50mm
Half Meter Motorized Imaging Monochromator / Spectrograph
9057F 457 F/5.9 0.1 1.79 Triple Grating
64 x 64m
Fast Version Half Meter Motorized Monochromator / Spectrograph
High Resolution Series Monochromators
9040-1G 550 F/6.9 0.03 1.53 Single Grating
64mm x 64mm
Half Meter High Resolution Monochromator / Spectrograph
9040-3G 550 F/6.9 0.03 1.53 Triple Grating
64mm x 64mm
Half Meter High Resolution
9040F 550 F/5.2 0.03 1.53 Single Grating
84 x 84mm
Half Meter High Resolution Fast Version
9040EF 550 F/4.0 0.05 1.53 Single Grating
102 x 102mm
Half Meter High Performance
9040-DS 550 F/6.9 0.03 Effectively 0 Single Grating
64 x 64mm
Half Meter High Resolution Double Subtractive
9040DA 550 F/6.9 0.015 4 Single Grating
64 x 64mm
Half Meter High Resolution Double Additive
9490 1000 F/13 0.017 0.83 Up to 3 Gratings
64 x 64mm
One Meter High Resolution
9490SD 1000 F/13 0.009 0.42 Up to 3 Gratings
64 x 64mm
One Meter High Resolution Single / Double Pass
9150 1500 F/12 0.013 0.5 Single Grating
102 x 102mm
One and a Half Meter High Resolution
9150SD 1500 x 2 F/12 0.0063 0.25 Single Grating
110 x 110mm
One and a Half Meter Single / Double Pass
9150X 1500 F/25 N / A 1pm / 1px Special
Gratings
One and a Half Meter Echelle Spectrometer

*Resolution (nm) and Dispersion (nm / mm) values measured with a1200 lines/mm grating

 

 


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Standard Series Monochromators - Configuration


Standard series monochromators can be configured in a number of different ways. Note that each standard series monochromator includes a Sciencetech SS-80 variable slit assembly. The included slit is usually mounted on the Monochromator input port.

 

Part #

Product

INPUT PORT CONFIGURATION

Standard

Front input

120-8042

Side Input Port for 9055/35/57/60

120-8030

Dual Input Ports for 9055/35/57/60

OUTPUT PORT CONFIGURATION

Standard

Front output

120-8043

Side Output Port for 9055/35/57/60

120-8031

Dual Output Ports for 9055/35/57/60

 

 

 

Grating Monochromator 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.

Go to Grating Selection

 

 

Monochromator 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

 

 


Monochromator Accessories


There are many accessories available for Sciencetechs line of small, standard and hi-res monochromators. For a complete list of accessories see the products in the Modular Spectroscopy Equipment list.