DTMc300 Double Monochromator

  • DTMc300 double monochromator connectors
  • DTMc300 double monochromator entrance and exit slits
  • Compact configuration DTMc300 double monochromator
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The DTMc300 300mm focal length double monochromator delivers the high configurational-flexibility and wide single-scan range of the TMc300, with the enhanced stray light rejection of a double monochromator.

In each component monochromator, up to 3 diffraction gratings feature to permit measurements over a wide spectral range. Multiple configurations are achieved via the addition, at the entrance/ exit ports of each, of an additional slit with a computer-controlled selection mirror (SAM).

Delivering best uncertainty in detector responsivity and time resolved measurements, the DTMc300 may be arranged in the additive dispersion mode, applicable in solutions incorporating a UV component, and subtractive dispersion mode, sought by high level laboratories requiring unsurpassed accuracy and complete measurement confidence.

Core benefits

 

  • Convenience of optional subtractive mode
  • Best uncertainty in detector responsivity and time resolved measurements
  • Exceptionally wide spectral range covered in single scan
  • Superlative measurement accuracy and ongoing reliability

 

 

Features

 

  • High configurational flexibility
  • Double monochromator comprising two TMc300 focal length monochromators
  • Czerny-Turner configuration, arranged for either additive or subtractive dispersion
  • Each single monochromator accommodates up to three diffraction gratings permitting single–scan measurement over wide spectral range (200nm-50µm)
  • Up to two entrance ports, one exit port on first monochromator (single mode) and one entrance port on the second monochromator (single mode)
  • Automated mirror-based port selection for use of multiple input/ output/ detector configurations

 

 

Optical Layout

Configuration

Pair symmetrical Czerny Turner monochromators arranged for either additive or subtractive dispersion

Focal length

Total focal length: 600mm (additive)

Individual Units: 300mm

Grating mount

Triple grating turret

Number of gratings

1-3

Grating size

68 x 84mm

Aperture ratio

f/4.1 (at all grating angles)

Number of entrance/ exit ports

1 or 2 in both monochromators

Opto-Mechanical

Mechanical resolution drive

0.000072°/ step

Slit type

Fixed, micrometer or motorised variable

Slit width & height

10µm-10mm (W) x 20mm (H)

Filter size

23/25mm diameter

Optical Performance (quoted for 1200 g/mm gratings)

Spectral range

Within range 200nm-50µm

Linear dispersion

1.35nm/mm (additive)

Wavelength accuracy

± 0.1nm

Wavelength reproducibility

± 0.025nm

Resolution full/reduced slit height

0.15/0.05nm

Stray light rejection at 2.5 FWHM

10-8

Wavelength acquisition speed

2000nm/s

Automation

Computer interface

USB 2.0

Software control

BenWin+/SDK

Electrical/ Mechanical

Overall dimensions

634L x 360W x 211H

Optical height

115mm

Weight

28 kg

Power supply

External PSU supplied (DC 24V 5A)

Options

Diffraction gratings

See Configurations Tab

Order sorting filters

See Configurations Tab

Filter wheel

252-6 or 252-8 (6/8-position filter wheel, includes shutter)

Monochromator Configurations

Standard Configurations

  

DTMc300 Single Configuration

  

DTMc300 Double Configuration A

  

DTMc300 Double Configuration B

  

Diffraction Gratings

A range of gratings are available depending on the spectral range of consideration, with up to three diffraction gratings mounted to each turret of the DTMc300.

Grating

Line density (g/mm)

Grating type & Blaze wavelength

Maximum wavelength range (nm)

GA-T324R0U25

2400

Plane ruled, 250nm blaze

200-600

GA-T324H0U25

2400

Plane holographic, 250nm blaze

200-600

GA-T324H0U3

2400

Plane ruled, 300nm blaze

200-600

GA-T318H0U25

1800

Plane holographic, 250nm blaze

250-900

GA-T318R0U4

1800

Plane ruled, 400nm blaze

250-900

GA-T318R0U5

1800

Plane ruled, 500nm blaze

250-900

GA-T312H0U25

1200

Plane holographic, 250nm blaze

300-1,200

GA-T312R0U4

1200

Plane ruled, 400nm blaze

300-1,200

GA-T312R0U5

1200

Plane ruled, 500nm blaze

300-1,200

GA-T312R0U75

1200

Plane ruled, 750nm blaze

300-1,200

GA-T312R0U9

1200

Plane ruled, 900nm blaze

300-1,200

GA-T312R1U0

1200

Plane ruled, 1µm blaze

300-1,200

GA-T3083R1U2

830

Plane ruled, 1.2µm blaze

600-1,800

GA-T306R1U0

600

Plane ruled, 1µm blaze

800-2,500

GA-T306R1U25

600

Plane ruled, 1.25µm blaze

800-2,500

GA-T306R1U6

600

Plane ruled, 1.6µm blaze

800-2,500

GA-T306R1U9

600

Plane ruled, 1.9µm blaze

800-2,500

GA-T306R2U16

600

Plane ruled, 2.16µm blaze

800-2,500

GA-T304R1U6

400

Plane ruled, 1.6µm blaze

1,000-3,000

GA-T303R3U0

300

Plane ruled, 3µm blaze

1,500-5,500

GA-T303R4U0

300

Plane ruled, 4µm blaze

1,500-5,500

GA-T3015R4U0-AU

150

Plane ruled, 4µm blaze. Gold coated.

3,000-10,000

GA-T3015R6U0-AU

150

Plane ruled, 6µm blaze. Gold coated.

3,000-10,000

GA-T301R9U0-AU

100

Plane ruled, 9µm blaze. Gold coated.

4,500-16,000

GA-T30075R10U0-AU

75

Plane ruled, 10µm blaze. Gold coated.

6,000-20,000

GA-T30075R12U0-AU

75

Plane ruled, 12µm blaze. Gold coated.

6,000-20,000

GA-T3005R18U0-AU

50

Plane ruled, 18µm blaze. Gold coated.

9,000-30,000

GA-T3005R19U5-AU

50

Plane ruled, 19.5µm blaze. Gold coated.

9,000-30,000

Slits

Slit type

Features

Fixed slits (FSS)

- Manually controlled

- Spring leaf to ensure the correct placement of the slit

Micrometer variable slits (VSS)

- Manually controlled

- Bi-lateral slits

- Variable from 10µm to 10mm

Motorised variable slits (MVSS)

- PC control via USB

- Driven via internal monochromator electronics or external MAC electronics bin

- Comprising stepping motor driven bi-lateral slits

- Variable from 10µm to 10mm

Filters

An order sorting filter wheel is located inside the entrance port of the monochromator, fitted with 6 or 8 filters selected for the spectral range of use.

When measuring below 400nm, no filters are required as the corresponding wavelength of the subsequent diffraction order is less than 200nm, which is naturally blocked by the atmosphere.

Spectral range

Required OS filter

<400 nm

None

400-700 nm

OS400

700-1250 nm

OS700

1250-2000 nm

OS1250

2000-3600 nm

OS2000

3.6-6 µm

OS3600

6-10.5 µm

OS6000

10.5-21 µm

OS10500

> 21 µm

Please consult.

Further Options

ND/ BP filters

Neutral density filters, used to attenuate optical signal level or band pass filters, to improve monochromator stray light performance, may be mounted in the filter wheel.

Purge ports

Purge ports fitted to monochromator to allow purging with nitrogen to remove atmospheric absorbants which absorb in the UV (<200nm) and IR (Various absorption bands).

Toroidal mirrors

Toroidal mirrors spherical mirrors replaced with toroidal mirrors for imaging applications.

Turret-mirror

A mirror may be fitted on a free location on the turret for the purposes of relating un-diffracted light to the exit port.

418-INT

418 optical chopper mounted behind the entrance slit.

Interchangeable turrets

For applications where very wide spectral range or regional optimisation is required, an interchangeable turret is available allowing the exchange of groups of three diffraction gratings to cover different spectral regions. In this case, the stepping motor in this case drives a platform to which is attached the grating assembly.

Shutter

Solenoid-based shutter for timed exposure applications.

Monochromator Dimensions

DTMc300 double monochromator front dimensions
DTMc300 monochromator profile - Front profile
DTMc300 double monochromator side dimensions
DTMc300 monochromator profile - Side profile
DTMc300 double monochromator top dimensions
DTMc300 monochromator profile - Top profile

Software Control

The DTMc300 may be controlled by PC, facilitated via a USB 2.0 interface by Bentham’s Benwin+ spectroradiometer software, responsible for:

  • Accessing grating filter wheel and slit properties
  • Identifying grating type and position
  • Wavelength selection and calibration
  • Spectral measurements
  • System calibration
  • Configuration files syntax

Alternatively, Bentham offers a comprehensive SDK for user-written programs, available across a wide range of platforms (LabVIEW, Matlab, C++, SCPI protocol, etc.).

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