Gemini Series Monochromators

Gemini Double Monochromator

Fully Automated Double Additive Monochromator

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.

Benefits

Ultra-low stray light rejection of 10-9
Excellent for high purity tunable illumination
Fully automated
Monochromator or imaging spectrograph
USB interface

Overview

Hardware

Monochromator Hardware

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.

Gratings

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.

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

Diffraction Grating Calculator

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.

Computer Control

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

Accessories

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 Accessories click 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 Sources click here. Incidentally, if you are looking for such a tunable illuminator we have a separate page describing our Tunable PowerArc compact 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.

Specifications

Specifications
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)