The CM112 may be factory configured as an additive or subtractive dispersion double monochromator. As an additive instrument, the first grating spreads the spectrum over an angular range; the second grating then doubles this dispersion. The result is twice the resolution of a single 1/8 meter monochromator. As a subtractive instrument, the first monochromator selects a bandpass, the second monochromator then removes the temporal and angular aberrations introduced by the angular spectral dispersion in the first monochromator.
The CM112 offers a solution to practical problems in monochromatic imaging. Selecting a monochromatic image with an ordinary monochromator fails because multiple wavelengths in the bandpass create multiple, overlapping images. In the CM112, the second subtractive monochromator recombines these multiple images, creating a clear image.
Finally, the CM112 is a unique solution to practical problems in the spectroscopy of pulsed sources. An ordinary monochromator has a spread in the internal optical path lengths that will introduce a 25 to 100 picosecond broadening in light pulses that are passed through the monochromator. In the subtractive dispersion CM112, the second monochromator equalizes the optical path lengths so that broadening is reduced to a minimum.
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Outline Dimension
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Features
- Compact Size: Only 5.25 x 6.25 x 3.25 inches
- Connects to any computer via RS 232
- Scans in both directions. Programmable in Angstrom, nanometers, microns, wavenumbers, or eV
- Dual double-grating turrets with automatic grating change allows for broad spectral range coverage
- Subtractive dispersion mode minimizes image distortion and pulse spread, with sub-picosecond residual broadening of regular monochromators
- Additive mode gives increased dispersion and low stray light for Raman fluorescence studies
- May be configured as a monochromator or a spectrograph
- Monochromator may be factory configured for right angle or straight through beam path
- Specifications
| Model | CM112 |
| Design | Double cascaded Czerny-Turner Double grating turrets standard in each section |
| Focal Length | 110mm each section |
| f/# | 3.9 |
| Beam Path |
Straight through standard Right angle provided on request |
| Wavelength Drive |
Dual worm and wheel with electronic synchronization and computer control. Programmable in additive or subtractive dispersion with positive or negative gratings orders. |
| Wavelength Precision |
0.1nm (Additive) 0.2nm (Subtractive) |
| Wavelength Accuracy |
± 0.3nm (Additive) ± 0.6nm (Subtractive) |
| Slewing Speed | > 100nm/s |
| Stray Light | <10-9 |
| Slits | Standard set includes: 0.125mm, 0.15mm, 0.3mm, 0.6mm, 1.2mm, and 2.4mm x 4.0mm. For other sizes, please consult us |
| Max Resolution | < 0.5nm (Additive) < 1nm (Subtractive) |
| Band Pass | ~1nm (with 1200gv/mm grating and 0.15mm slit) |
| Gratings | 2 or 4 gratings (30 x 30mm) must be purchased |
| Software | Demonstration control program and LabView driver included |
| Power | UL listed 110 / 220V power pack |
| Interface | standard: RS 232 |
| Weight | 2.3kg |
| Warranty | 1 year |
CM series Standard Gratings (30 x 30mm)
| Part # | Ruling (g/mm) | Peak (nm) | Range (nm) | Peak T% |
| AG2400-00240-303 | 2,400 | 240 | 180 - 680 | 70 |
| AG1200-00500-303 | 1,200 | 500 | 330 - 1000 | 83 |
| AG1200-00600-303 | 1,200 | 600 | 400 - 1500 | 80 |
| AG1200-00750-303 | 1,200 | 750 | 480 - 1500 | 85 |
| AG0600-00500-303 | 600 | 500 | 350 - 1300 | 80 |
| AG0600-01200-303 | 600 | 1200 | 800 - 3000 | 85 |
| AG0300-00500-303 | 300 | 500 | 310 - 1100 | 80 |
| AG0300-02500-303 | 300 | 2500 | 1500 - 6000 | 88 |
| AG0150-00500-303 | 150 | 500 | 320 - 980 | 72 |
| AG0150-04000-303 | 150 | 4000 | 2500 - 9000 | 93 |
| AG0075-08000-303 | 75 | 8000 | 5000 - 15000 | 82 |
| AG0075-01700-303 | 75 | 1700 | 1100 - 2800 | 85 |
| AG0045-01750-303 | 45 | 1750 | 1100 - 3000 | 78 |
Response curves also available upon request.
Accessories for CM Series
| Models | Description |
| CM1201 | Hand-held control module for CM110/112 |
| CMFS020 | Special 20цm wide by 2mm tall slit pair for CM Series |
| CMFS050 | Special 50цm wide by 2mm tall slit pair for CM Series |
| CMFS100 | Fixed Slit Set W=.125mm,.15mm,.30mm.,.60mm,1.2mm,2.4mm, H=4mm |
| CMFS100-0125 | Individual Fixed Slit W=.125mm, H=4mm |
| CMFS100-0150 | Individual Fixed Slit W=.15mm, H=4mm |
| CMFS100-0300 | Individual Fixed Slit W=.30mm, H=4mm |
| CMFS100-0600 | Individual Fixed Slit W=.60mm, H=4mm |
| CMFS100-1200 | Individual Fixed Slit W=1.2mm, H=4mm |
| CMFS100-2400 | Individual Fixed Slit W=2.4mm, H=4mm |
| IR110 | Infrared (gold) coatings for CM110 mirrors |
| IR112 | Infrared (gold) coatings for CM112 mirrors |
| LRMIR110 | SP's Low Reflection Material option with higher absorption for the IR range, for CM110 |
| LRMIR112 | SP's Low Reflection Material option with higher absorption for the IR range, for CM112 |
| MCL100 | Universal Output Conditioner for CM and DK series |