Standard Series



Standard Monochromator Configuration

Step 1: Choose Chassis and F/#

Part #

Model

F/#

Focal Length

Turret

Configuration

120-9002

9010

F/3.5

200

Double Grating

120-9001

9010F

F/2.6

200

Double Grating

120-9018

9055

F/3.5

200/250

Triple Grating

120-9023

9055F

F/2.5

200/250

Double Grating

120-9008

9057

F/8

500

Triple Grating

120-9042

9057F

F/5.9

500

Double Grating

120-9017

9055DX

F/3.5

200/250

Triple Grating

Step 2: Choose Input Port Configuration

Part #

Description

120-8042

Side Input Port

120-8030

Dual Input Port

120-8072

Motorized Input Port

Step 3: Choose Output Port Configuration

Part #

Description

120-8043

Side Output Port

120-8031

Dual Output Port

120-8073

Motorized Output Port

There are three basic parameters to consider when choosing a grating for your standard series monochromator

 

 A) Required Wavelength Range

 

The wavelength range available to you is determined by the grating groove density chosen and the angular mechanical limitation of the monochromator.

 

 B) Grating Efficiency

 

Ruled gratings may be blazed to increase their efficiency over a specific wavelength band.  Holographic gratings can be modulated such that they are more efficient at some wavelengths then at others.  Grating efficiency curves are the best tool for determining the most efficient grating available for your application.  It is important to note that grating efficiency curves do not represent the exact efficiency that should be expected when the grating is used in a monochromator as grating efficiency curves are taken at Littrow angle. 

 

 C)    Required Resolution and Bandwidth

 

Resolution is a measure of an instrument’s ability to separate adjacent spectral lines.  Resolution is generally given in nm.  The bandwidth (or bandpass) is the wavelength range that falls on the output port at any one time and is also given in nm.  This is an important parameter when integrating a camera such as a linear array or CCD on the output port of the monochromator.

 

Grating Selection Table for 200/250mm Focal Length Monochromators

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

 


Standard mirror coatings are aluminum with a MgF2 protective layer.  Standard gratings have an aluminum coating.  metallic coating.  If your application would benefit from different mirror or grating coatings please refer to the codes below at the time of order.

Mirror or Grating Coating

Useful Range

Code

Aluminum (MgF2 coating)

350nm +

Standard

UV enhanced Aluminum

200nm +

-UV

Silver

400nm +

-S

Gold

600nm – Far IR, best option for NIR

-G

Standard Czerney-Turner type monochromators suffer from astigmatism in the output beam due to the use of off-axis spherical mirrors.  Often the astigmatism is not an issue.  For imaging applications a torroidal mirror is used to compensate for the inherent astigmatism in the optical system produce a direct image of the input slit at the output port.  This is an important option for studying phenomena such as fast kinetics.

Imaging Option

Note

Code

9055-i Monochromator

(previously 9060)

For 120-9018 Chassis only

120-9060

9057-i Monochromator

For 120-9008 Chassis only

120-9061

 

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