Gemini 180

Double monochromator

Double additive grating scanning monochromator for low light applications

The Gemini 180 is a fully automated, double additive grating scanning monochromator. Inside the monochromator housing are two 180 mm focal length monochromators that share a common intermediate slit. The incorporation of toroidal optics provides optimum throughput and spectral resolution.  It is ideal for applications that require low stray light including transmission, absorbance, reflectance, and fluorescence.  The Gemini 180 also functions as a high power, high purity light source for fluorescence, detector characterization, and microscope illumination when coupled with a xenon lamp. These monochromators also benefit from the highest quality of gratings, also designed and manufactured by HORIBA.

Segment: Scientific
Division: Custom Spectroscopy Solutions
Base product
  • Ultra-low stray light rejection of 10-9
  • Excellent for high purity tunable illumination
  • Fully automated
  • Monochromator or imaging spectrograph
  • USB interface

Slits

The GEMINI-180 has three motorized slits: Entrance, Intermediate and Exit. In the standard version, each slit may be set between 0–7 mm. A custom version may be ordered (designated GEMINI-180-2) with a set of three slits which may be set between 0–2 mm. The slits are internal to the monochromator. A manually adjustable height limiter allows the user to quickly shut or open the light path to 1 mm and 15 mm heights.

You can add accessories to the Gemini-series spectrometers to obtain optimum results for a variety of applications. To attach the accessories to the Gemini, use the two tapped holes on the body of the height limiter on the outside of the monochromator (shown below). These holes are also useful for connecting the Gemini with your experiments and equipment. When connecting with the Gemini, it is important to know the distance from the mounting face of the slit’s body to the slits.

Height limiter

Note that some custom accessories require removal of the height-limiter assembly in order to be attached to the FHR chassis. To remove the height-limiter assembly, remove the four screws holding the assembly onto the chassis.

World Class Diffraction Gratings Manufactured by HORIBA

A Proud Tradition of Excellence

Since the acquisition by HORIBA of Jobin Yvon, a spectroscopy company founded in 1819, HORIBA Scientific has continued to define the leading edge of the Optics of Spectroscopy.

For the last 40 years HORIBA Scientific has taken a leading position in the design, development and manufacture of master and replica diffraction gratings. HORIBA Scientific diffraction gratings are found in both high volume OEM instruments and in world class cutting edge scientific applications. Our pattern of leadership in optics has been hallmarked by the continuing development of both classically ruled and holographic diffraction grating technologies. This led to the introduction in 1967 of the aberration corrected holographic grating and subsequently ion etched and blazed concave and plane holographic gratings.

The Gemini series of spectrometers take full advantage of the highest quality of gratings that HORIBA designs and manufactures.

A Vast Array of Choices

There is a wide selection of gratings to choose from depending on optical requirements. Gratings are 50 x 50 mm for the M Series. There are three different types of gratings available; classically ruled, holographic, and blazed holographic. There is also a flat mirror that may be ordered for the dual grating turret option.

Ruled gratings

Select for applications where high throughput or low groove density is required, or when working in the infrared.  Typically, they have high throughput at the cost of higher stray light. 

Holographic gratings

Available in higher groove densities for finer resolution requirements and are excellent choices for experiments with laser excitation such as Raman or laser induced photoluminescence. They provide the lowest possible stray light possible, sometimes at the cost of lower throughput. 

Blazed holographic gratings

These gratings have the same advantages as holographic gratings with better throughput.

Groove Density

Ruled gratings and blazed holographic gratings have two fundamental parameters to choose from; the groove density, expressed in grooves (or lines) per millimeter, and the blaze angle which nominally refers to the peak reflectance wavelength expressed in nanometers.

Ruled gratings and blazed holographic gratings have two fundamental parameters to choose from; the groove density, expressed in grooves (or lines) per millimeter, and the blaze angle which nominally refers to the peak reflectance wavelength expressed in nanometers.

The groove density of the selected grating affects the resolution and mechanical scanning range of the monochromator. Below is a reference chart showing the affect groove density has on the mechanical scanning range of the monochromator as well as the reciprocal linear dispersion of the slits.

Below is a comprehensive list of available gratings for the M series of spectrometers. Other gratings are also available upon request.

Ruled Gratings

Groove Density L/mm

Blaze Wavelength

Recommended Spectral Range

Blaze Angle

Part Numbers

1800

300 nm

150-600 nm

17°27'

510 01 330

1800

500 nm

250-850 nm

26°45'

510-02-330

1800

630 nm

350-850 nm

34°32'

510 03 330

1200

250 nm

150-500 nm

8°38'

510-04-330

1200

330 nm

200-700 nm

11°25'

510-05-330

1200

400 nm

200-800 nm

13°53'

510-06-330

1200

500 nm

250-950 nm

17°27'

510-07-330

1200

630 nm

350-1200 nm

22°12'

510 08 330

1200

750 nm

400-1200 nm

26°45'

510-09-330

1200

1µm

500-1200 nm

36°52'

510-10-330

900

350 nm

200-700 nm

9°00'

510 91 330

900

550 nm

250-1100 nm

14°30'

510-93-330

900

1.5 µm

600-1700 nm

42°27'

510-97-330

600

300 nm

200-600 nm

5°10'

510-11-330

600

400 nm

250-800 nm

6°54'

510-12-330

600

500 nm

250-1000 nm

8°38'

510-13-330

600

750 nm

400-1500 nm

13°00'

510-14-330

600

1µm

500-1700 nm

17°27'

510-15-330

600

1.5 µm

750-2400 nm

26°45'

510-16-330

600

2 µm

1000-2400 nm

36°52'

510-17-330

300

250 nm

150-500 nm

2°09'

510-50-330

300

500 nm

300-950 nm

4°18'

510-18-330

300

600 nm

350-1300 nm

5°10'

510-19-330

300

1 µm

700-2000 nm

8°38'

510-20-330

300

2 µm

1100-4500 nm

17°27'

510-21-330

300

3 µm

1700-5000 nm

26°45'

510-22-330

300

4 µm

2000-5000 nm

36°52'

510-23-330

150

500 nm

250-950 nm

2°09'

510-49-330

150

1-2 µm

800-2300 nm

5°10'

510-24-330

150

2 µm

1200-4000 nm

8°38'

510-25-330

150

4 µm

2.2 - 9 um

17°27'

510-26-330

150

5 µm

3.5 - 10 um

22°01'

510-27-330

150

6 µm

4 - 10 um

26°45'

510 28 330

150

8 µm

5 - 10 um

36°52'

510 29 330

120

2-5 µm

1.7 - 4.5 um

8°39'

510-30-330

120

5 µm

3 - 10 um

17°27'

510-31-330

120

7-5 µm

4.5 - 12 um

26°45'

510-32-330

100

450 nm

250-950 nm

1°17'

510-48-330

100

3 µm

1.7 - 6 um

8°38'

510 33 330

100

6 µm

3 - 13 um

17°27'

510 34 330

100

9 µm

5 - 14.5 um

26°45'

510 35 330

75

4 µm

2 - 8 um

8°38'

510-36-330

75

8 µm

5.5 - 17 um

17°27'

510 37 330

75

12 µm

8 - 19 um

26°45'

510-38-330

60

10 µm

7.5 - 13 um

17°27'

510-39-330

60

15 µm

9 - 24 um

26°45'

510-40-330

50

6 µm

3 - 12 um

8°38'

510-41-330

50

12 µm

8 - 22 um

17°27'

510-42-330

50

18 µm

11 - 28 um

26°45'

510-43-330

50

24 µm

15 - 30 um

36°52'

510-44-330

40

22-5 µm

14 - 30 um

26°45'

510 45 330

30

30 µm

N/A

26°45'

510 46 330

20

45 µm

N/A

26°45'

510 47 330

Holographic Gratings

Groove Density L/mm

Recommended Spectral Range

Part Numbers

3600

150-400 nm

520-07-330

3000

250-450 nm

520-09-330

2400

300-600 nm

520-12-330

2400

170-500 nm

520-13-330

2400

100-300 nm

520 14 330

2000

450-650 nm

520 15 330

2000

190-650 nm

520 16 330

2000

150-450 nm

520 17 330

2000

100-300 nm

520 18 330

1800

450-850 nm

520 -19 -330

1800

190-700 nm

520 -20 -330

1800

150-450 nm

520 -21 -330

1800

100-300 nm

520 22 330

1200

400-1200 nm

520 -24 -330

1200

190-700 nm

520 -25 -330

1200

150-450 nm

520 -26 -330

600

400-1300 nm

520 -29 -330

600

150-450 nm

520 30 330

150

250-800 nm

520 -32 -330

150

400-1200 nm

520 33 330

Blazed Holographic Gratings

Groove Density L/mm

Blaze Wavelength

Recommended Spectral Range

Part Number

2400

250 nm

190-600 nm

530-13-330

2400

330 nm

200-600 nm

530-11-330

2400

400 nm

300-600 nm

530-15-330

1800

500 nm

450-850 nm

530 19 330

1800

250 nm

180-650 nm

530-20-330

1800

400 nm

250-850 nm

530-18-330

1200

250 nm

190-450 nm

530-25-330

1200

330 nm

240-800 nm

530-22-330

1200

500 nm

300-1000 nm

530-24-330

1200

630 nm

400-1200 nm

530-27-330

1200

750 nm

500-1200 nm

530-28-330

1200

900 nm

600-1200 nm

530-50-330

950

900 nm

700-1700 nm

530-60-330

900

850 nm

700-1700 nm

530-66-330

600

500 nm

300-1000 nm

530-29-330

600

1000 nm

700-1750 nm

530 34 330

The Diffraction Grating Calculator below can be used to determine the various optical performance specifications of HORIBA spectrometers when used in conjunction with selected spectroscopy cameras, point detectors and various grating alternatives. It is a very useful tool with pull down selections of all of our current spectrometers, cameras and gratings.

In addition to wavelength control the MicroHR has an optional automated turret control and automated control of the optional internal five position filter wheel.

There are multiple software platforms to choose from for spectrometer control and acquisition.

LabSpec

HORIBA’s world renowned software platform, LabSpec is ideal for most Raman and photoluminescence applications. It offers advanced capabilities, with expert functionality, control and flexibility. LabSpec is the first choice for most spectrometer customers.

SynerJY™

SynerJY™ software is a fully integrated data acquisition and data analysis program for spectroscopic systems. It is selected for custom spectroscopy configurations not suitable for LabSpec.

LabVIEW™

LabVIEW VI’s are now available for the complete line of instrumentation from the Optical Spectroscopy Division, allowing users to work with the LabVIEW™ development package from National Instruments. This option requires proficiency with LabVIEW™ programing.

SDK

Software Development Kits (SDK’s) are available for programmers who wish to write their own software control of HORIBA spectrometers. This option absolutely requires proficiency with programing

 

Compatible Optical Building Blocks

The Gemini 180 monochromator is one of many inter-connectable Optical Building Blocks available from HORIBA Scientific. These Optical Building Blocks can be ordered together to form a subassembly or even a complete custom spectroscopy solution.

C-Mount Adapter

The Gemini series can be provided with ational C-Mount coupler accessory for the exit port that allows it to be coupled to cameras that use a C-Mount thread. It can also be equipped with an entrance side C-Mount coupler so that it can be directly attached to a microscope with an appropriate C-Mount detection port.

Fiber Light Guides

We offer a selection of fiber optic and liquid light guides to choose from depending on the application.

Lens based fiber-coupler with f/# matching optics for SMA and ferrule (part number 220F, or 220F-AFC for FC Mount fibers).

Direct fiber-coupler with no optics for 10 mm and 0.25″ ferrule with thumbscrew x-y adjusters, (part number AFO-XY)

Mirror based fiber-coupler for 10 mm ferrule (part number J23078640). Contact us for information about SMA and FC adapters.

Simple fiber-adapter for 0.25″ ferrule (part number 120F).

Optical Choppers

If you would like to use an optical chopper with your spectrograph/monochromator, then we have a number of solutions. To learn more Optical Accessoriesclick here.


Single Channel Detectors

HORIBA offers a comprehensive array of single point detectors for a wide variety of applications in spectroscopy and biomedical research. These are complete detectors including housings, power supplies and facility for cooling if necessary. Used in conjunction with our monochromators and spectrographs these detectors allow you to configure a custom solution for your unique requirements. To learn more, click here.

Broad Band Light Sources

HORIBA Scientific has an excellent selection of broadband light sources. If you would like to couple the spectrograph/monochromator to one of these light sources, then we have adapters to physically connect them and create a tunable illuminator. To learn more about our broad band light sources, Light Sourcesclick here. Incidentally, if you are looking for such a tunable illuminator we have a separate page describing our Tunable PowerArccompact tunable illuminator, and our ultimate KiloArc™ tunable illuminator.

Sample Compartment

If you would like to couple your spectrograph/monochromator to a sample compartment, then we have a number of solutions. To learn more click here.

 

Optical layout

Double Czerny-Turner with toroidal optics providing maximum throughput

Focal length

180 mm

Aperture

f/3.8

Reciprocal linear dispersion

2.1 nm/mm using 1200 gr/mm grating

Resolution

0.15 nm at 546.1 nm with 10 μm slits

Stray light

10-9(measured at 1 nm from 514 nm laser with HORIBA Scientific holographic gratings)

Slits

High-precision motorized, 0 to 2 mm width (2.25 micron step size) or 0 to 7 mm width (6.25 micron step size),
1 mm or 15 mm height (manual slider)

Bandpass

Continuously adjustable from 0 to 15 nm (1200 gr/mm grating)

Wavelength scanning

Direct digital stepper-motor drive (worm drive)

Scan Speed

160 nm/s

Spectral range

150 to 1500 nm (1200 gr/mm grating)

Accuracy

±0.05 nm

Repeatability

±0.1 nm

Drive step-size

0.06 nm (nominal)

On-board electronics

Every aspect of the Gemini-180 is automated including the spectrometer wavelength-drive, entrance, exit, and intermediate slits, and internal shutters.

Computer control

USB 2.0 built in

Shutter

Optional, inside entrance slit 
Optional PMT shutter, inside entrance slit

Dimensions (not including adjustable legs)

18.2" (W) × 16.4" (L) × 7.5" (H)
46.2 cm (W) × 41.7 cm (L) × 19.1 cm (H)

All specifications given for 1200 g/mm grating and are subject to change without notice.

Gemini 180 Specification Sheet
CategoryDocuments
Size 0.98 MB
FiletypePDF

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