iHR Series Spectrographs

Simply the Best Imaging Spectrometer with No Compromise

HORIBA’s most popular and iconic spectrometers, the iHR series build on decades of experience in spectroscopy and represent the highest quality, performance and versatility of any spectrometer in this class. The iHR 320 and iHR 550 spectrometers are immediately recognizable around the world by their unique shape, the result of a superior optical design. These spectrometers benefit from the highest quality of gratings, also designed and manufactured by HORIBA.

Two spectrometers to choose from

320 mm focal length f/4.1

550 mm focal length f/6.4

Best in class performance

Widest range of applications
Widest selection of options
No re-diffracted light
Fully automated
Best in class resolution
Best in class image quality
Dual entrance & exit ports

Overview

: Unique optical design

Not all Czerny-Turner spectrometers are built the same

No one has more experience in designing and manufacturing spectrometers than HORIBA Scientific. When we designed the iHR we made a quantum leap forward in the traditional Czerny-Turner design and developed an asymmetrical spectrometer that is patented and immediately recognizable by its distinctive shape and design. With zero re-diffracted light, correction for optical aberrations, multi-track image capabilities and more options than any competitor, the iHR series offers best in class performance and flexibility.
For more details on the outstanding performance characteristics of this unique spectrometer, refer to our technical note, titled “Not all Czerny-Turner spectrometers are made the same”.

Inherent Benefits

	iHR Series	Competition	iHR Benefits
Housing manufacture	Single Casting	Panels	Better stray light rejection
Size of entrance & exit swing away mirrors	Exit greater than entrance	Exit the same as entrance	No vignetting and homogeneous illumination of CCD
Non-crossed Czerny-Turner asymmetric optics	Yes	No	No re-diffracted light to present spurious signals
On-axis grating rotation with single motor triple grating turret	Yes	No	Patented design ensures uniform illumination
Dual entrance port	Yes	No	Flexibility
Dual exit port	Yes	No	Flexibility, no vignetting
Up to 4 single channel detectors or 2 single channel and one array	Yes	No	Flexibility and broad spectral coverage

Hardware

The iHR series of spectrometers stand out in the field of standard Czerny-Turner spectrometers. They are manufactured from a single solid casting to eliminate light leaks and provide the strongest, most stable possible housing for the instrument. The computer optimized asymmetric optical path and patented on-axis grating drive improve image quality, while eliminating re-diffracted light and maximizing optical throughput. In addition, the use of toroidal mirrors corrects for astigmatism at the center of the focal plane, providing flexibility to work in either an imaging or resolution optimized configuration.

The iHR series spectrometers are fully automated; all motors are computer controlled including slits, gratings, turret rotation, and swing mirrors. There are four optional ports, two entrance and two exit, that can be utilized in any combination of two inputs and two outputs. The two optional output ports can be configured with either slits or array flanges for use with multichannel detectors.

Slits

The monochromator slits are adjustable automated slits with two available options; 0 to 2 mm opening with 2.25 micron step size and 0 to 7 mm opening with 6.25 micron step size. 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 HR series spectrometers to obtain optimum results for a variety of applications. To attach the accessories to the iHR, use the two tapped holes on the body of the slit. These holes are also useful for connecting the iHR with your experiments and equipment. When connecting with the iHR, it is important to know the distance from the mounting face of the slit’s body to the slits.

Note that some custom accessories require removal of the height-limiter assembly in order to be attached to the iHR 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

With the acquisition by HORIBA of Jobin Yvon, a spectroscopy company founded in 1819, HORIBA Scientific continues 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 iHR 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 68 x 68 mm for the iHR320 and 76 x 76 mm for the iHR550. There are three different types of gratings available; classically ruled, holographic, and blazed holographic.

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.

Groove Density	Mechanical Scanning Range (nm)*	Reciprocal Linear Dispersion (nm/mm)
Groove Density	Mechanical Scanning Range (nm)*	iHR320	iHR550
2,400 g/mm	0 to 750 nm	0.87 nm/mm	0.53 nm/mm
1,200 g/mm	0 to 1,500 nm	2.29 nm/mm	1.34 nm/mm
600 g/mm	0 to 3,000 nm	4.91 nm/mm	2.83 nm/mm
300 g/mm	0 to 6,000 nm	10.06 nm/mm	5.75 nm/mm
150 g/mm	0 to 12,000 nm	20.30 nm/mm	11.58 nm/mm

*High grating efficiency can be attained at up to 80% of the maximum mechanical scanning range, after which the grating efficiency decreases.

The triple grating turret that comes standard with the iHR series allows you to select three different gratings, to optimize throughput in different wavelength ranges and provide multiple options for different resolution requirements. The gratings are positioned in a patented on-axis turret design to provide the maximum possible mechanical tuning range while preventing beam walk-off. For even greater flexibility, the entire triple grating turret assembly can be easily and very quickly replaced with a different triple grating turret assembly, and the patented turret design assures proper alignment and on axis grating rotation.

Below is a comprehensive list of available gratings for the iHR 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
Groove Density L/mm	Blaze Wavelength	Recommended Spectral Range	Blaze Angle	iHR320 68x68 mm	iHR550 76x76 mm
1800	300 nm	150-600 nm	17°27'	510 01 120	510 01 141
1800	500 nm	250-850 nm	26°45'	510-02-120	510 02 141
1800	630 nm	350-850 nm	34°32'	510 03 120	Not Available
1200	250 nm	150-500 nm	8°38'	510-04-120	510-04-141
1200	330 nm	200-700 nm	11°25'	510-05-120	510-05-141
1200	400 nm	200-800 nm	13°53'	510-06-120	510-06-141
1200	500 nm	250-950 nm	17°27'	510-07-120	510-07-141
1200	750 nm	400-1200 nm	26°45'	510-09-120	510-09-141
1200	1µm	500-1200 nm	36°52'	510-10-120	510-10-141
900	350 nm	200-700 nm	9°00'	510 91 120	510 91 141
900	550 nm	250-1100 nm	14°30'	510-93-120	510-93-141
900	1.5 µm	600-1700 nm	42°27'	510-97-120	510-97-141
600	300 nm	200-600 nm	5°10'	510-11-120	510-11-141
600	400 nm	250-800 nm	6°54'	510-12-120	510-12-141
600	500 nm	250-1000 nm	8°38'	510-13-120	510-13-141
600	750 nm	400-1500 nm	13°00'	510-14-120	510-14-141
600	1µm	500-1700 nm	17°27'	510-15-120	510-15-141
600	1.5 µm	750-2400 nm	26°45'	510-16-120	510-16-141
600	2 µm	1000-2400 nm	36°52'	510-17-120	510-17-141
300	250 nm	150-500 nm	2°09'	510-50-120	510-50-141
300	500 nm	300-950 nm	4°18'	510-18-120	510-18-141
300	600 nm	350-1300 nm	5°10'	510-19-120	510-19-141
300	1 µm	700-2000 nm	8°38'	510-20-120	510-20-141
300	2 µm	1100-4500 nm	17°27'	510-21-120	510-21-141
300	3 µm	1700-5000 nm	26°45'	510-22-120	510-22-141
300	4 µm	2000-5000 nm	36°52'	510-23-120	510-23-141
150	500 nm	250-950 nm	2°09'	510-49-120	510-49-141
150	1.2 µm	800-2300 nm	5°10'	510-24-120	510-24-141
150	2 µm	1200-4000 nm	8°38'	510-25-120	510-25-141
150	4 µm	2.2 - 9 um	17°27'	510-26-120	510-26-141
150	5 µm	3.5 - 10 um	22°01'	510-27-120	510-27-141
150	6 µm	4 - 10 um	26°45'	510 28 120	510 28 141
150	8 µm	5 - 10 um	36°52'	510 29 120	510 29 141
120	2-5 µm	1.7 - 4.5 um	8°39'	510-30-120	510-30-141
120	5 µm	3 - 10 um	17°27'	510-31-120	510 31 141
120	7-5 µm	4.5 - 12 um	26°45'	510-32-120	510-32-141
100	450 nm	250-950 nm	1°17'	510-48-120	510-48-141
100	3 µm	1.7 - 6 um	8°38'	510 33 120	510 33 141
100	6 µm	3 - 13 um	17°27'	510 34 120	510 34 141
100	9 µm	5 - 14.5 um	26°45'	510 35 120	510 35 141
75	4 µm	2 - 8 um	8°38'	510-36-120	510-36-141
75	8 µm	5.5 - 17 um	17°27'	510 37 120	510 37 141
75	12 µm	8 - 19 um	26°45'	510-38-120	510-38-141
60	10 µm	7.5 - 13 um	17°27'	510 39 120	510 39 141
60	15 µm	9 - 24 um	26°45'	510 40 120	510 40 141
50	6 µm	3 - 12 um	8°38'	510-41-120	510-41-141
50	12 µm	8 - 22 um	17°27'	510-42-120	510-42-141
50	18 µm	11 - 28 um	26°45'	510-43-120	510-43-141
50	24 µm	15 - 30 um	36°52'	510-44-120	510-44-141
40	22-5 µm	14 - 30 um	26°45'	510 45 120	510 45 141
30	30 µm	N/A	26°45'	510 46 120	510 46 141
20	45 µm	N/A	26°45'	510 47 120	Not Available

Holographic Gratings

Groove Density L/mm	Recommended Spectral Range	Part Numbers
Groove Density L/mm	Recommended Spectral Range	iHR320 68x68 mm	iHR550 76x76 mm
3600	150-400 nm	520-07-120	520-07-141
3000	250-450 nm	520-09-120	520-09-141
2400	300-600 nm	520-12-120	520-12-141
2400	170-500 nm	520-13-120	520-13-141
2400	100-300 nm	520 14 120	520 14 141
2000	450-650 nm	520 15 120	520 15 141
2000	190-650 nm	520 16 120	520 16 141
2000	150-450 nm	520 17 120	520 17 141
2000	100-300 nm	520 18 120	520 18 141
1800	450-850 nm	520 -19 -120	520 -19 -141
1800	190-700 nm	520 -20 -120	520 -20 -141
1800	150-450 nm	520 21 120	520 21 141
1800	100-300 nm	520 22 120	520 22 141
1200	400-1200 nm	520 -24 -120	520 -24 -141
1200	190-700 nm	520 -25 -120	520 -25 -141
1200	150-450 nm	520 -26 -120	520 -26 -141
600	400-1300 nm	520 -29 -120	520 -29 -141
600	150-450 nm	520 30 120	520 30 141
150	250-800 nm	520 32 120	520 32 141
150	400-1200 nm	520 33 120	520 33 141

Blazed Holographic Gratings

Groove Density L/mm	Blaze Wavelength	Recommended Spectral Range	Part Numbers
Groove Density L/mm	Blaze Wavelength	Recommended Spectral Range	iHR320 68x68 mm	iHR550 76x76 mm
2400	250 nm	190-600 nm	530-13-120	530-13-141
2400	330 nm	200-600 nm	530-11-120	530-11-141
2400	400 nm	300-600 nm	530-15-120	530-15-141
1800	500 nm	450-850 nm	530 19 120	530 19 141
1800	250 nm	180-650 nm	530-20-120	530-20-141
1800	400 nm	250-850 nm	530-18-120	530-18-141
1200	250 nm	190-450 nm	530-25-120	530-25-141
1200	330 nm	240-800 nm	530-22-120	530-22-141
1200	500 nm	300-1000 nm	530-24-120	530-24-141
1200	630 nm	400-1200 nm	530-27-120	530-27-141
1200	750 nm	500-1200 nm	530-28-120	530-28-141
1200	900 nm	600-1200 nm	530-50-120	530-50-141
950	900 nm	700-1700 nm	530-60-120	530-60-141
900	850 nm	700-1700 nm	530-66-120	530-66-141
600	500 nm	300-1000 nm	530-29-120	530-29-141
600	1000 nm	700-1750 nm	530-34-120	530-34-141

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

All monochromator controls are fully automated including slit widths, turret position, wavelength, and swing mirror position. Slit widths may be set in step sizes of 2.25 micron for the 0 – 2 mm slit option and 6.25 micron steps for the 0 – 7 mm slit option. The turret position may be changed to switch from one grating to another and the wavelength may be tuned for the grating currently selected. The swing mirror position on either the entrance or exit of the monochromator can be adjusted to axial or lateral ports to switch between different entrance or exit front or side ports.

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

Schematics

iHR320, Top View

iHR320, Front View

iHR550, Top View

iHR550, Front View

Accessories

Compatible Optical Building Blocks

The iHR series spectrograph is one of many inter-connectible 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.

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).

Internal Filter Wheels

UV-Vis: iHR internal filter wheel mounts at the entrance port only (not suitable for side entrance). The UV-Vis part number is AFW-IHR-UVVIS, and it include a blank window, 320 nm LP and 550 nm LP filters. 3 mm filter-thickness only.

NIR: iHR internal filter wheel mounts at the entrance port only (not suitable for side entrance). The near-IR part number is AFW-IHR-NIR, and it includes a blank window, and 1000 nm LP filters. 1 mm filter-thickness only.

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.

Spectroscopy Cameras

HORIBA Scientific offers a complete line of spectroscopic multi-channel detectors for scientific research. For spectral detection from UV to near-IR, two dimensional CCDs and indium gallium arsenide linear arrays offer a faster acquisition option over single point detectors with very high sensitivity. Coupled with HORIBA’s range of aberration corrected, flat field imaging spectrographs, custom spectroscopy packages can be assembled for a variety of applications. To learn more, Spectroscopy Cameras 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.

Specifications

Specifications Using standard 1200 line/mm ruled grating at 435 nm
	iHR320	iHR550
Focal length	320 mm	550 mm
Aperture ratio	f/4.1	f/6.4
Wavelength range	150 to 1500 nm with 1200 gr/mm grating 180 nm to 40 microns (grating dependent)
Flat Field Size	30 mm x 12 mm
Bandpass	Continuously adjustable from 0 to 16 nm (1,200 g/mm)	Continuously adjustable from 0 to 9 nm (1,200 g/mm)
Reciprocal linear dispersion at slit	2.31 nm/mm (1,200 g/mm)	1.34 nm/mm (1,200 g/mm)
Resolution with exit slit and PMT	0.06 nm (1,200 g/mm)	0.025 nm (1,200 g/mm)
Stray Light (measured at 1 nm from 514 nm laser with HORIBA Scientific holographic gratings)	1.5 x 10 -4 (typical)	1 x 10 -5 (typical)
Accuracy	+/- 0.2 nm
Scan Speed	160 nm/s
Step Size	0.002 nm
Reproducibility	+/- 0.075 nm
Optical path height	98 mm
Grating size	68 x 68 mm	76 x 76 mm
Slit adjustment	0 to 2 mm width (2.25 micron step size) 0 to 7 mm width (6.25 micron step size) 1 mm or 15 mm height (manual slider)

Monochromator Dimensions
	iHR320	iHR550
Length	417 mm long (16.4 inches)	648 mm long (25.51 inches)
Width	422 mm wide (16.6 inches)	460 mm long (18.09 inches)
Height	192 mm high (7.6 inches)	193 mm long (7.78 inches)
Weight	20 kg (45 lbs)	28 kg (62 lbs)