Tunable PowerArc

Tunable 75W Xe Light Source

The brightest 75W Xe continuously tunable light source from 180 nm to 2400 nm

If this sounds like the light source you need, then HORIBA has the answer. The Tunable PowerArc™ Illuminator provides all of these benefits, it just isn’t a laser.

  • Need a high intensity CW laser that is tunable from 250 to 1,000 nm? yes
  • Need it to deliver milliwatts of energy? yes
  • Need it to be portable and so simple that anyone can operate it? yes


Segment: Scientific
Division: Custom Spectroscopy Solutions
Base product
Manufacturing Company: HORIBA Scientific

Think of the Tunable PowerArc™ Illuminator as a continuously tunable high intensity laser. It can produce tunable monochromatic light with hundreds of milliwatts of power, and an overall available spectral output from 180 nm to 24 microns.

Tunable PowerArc™ Illuminator equipped with 75 watt xenon lamp and 1,200 l/mm x 750 nm blazed grating. Here the adjustable bandpass was set to 10 nm.

Key Benefits of the Tunable PowerArc™ Illuminator

  • Continuously tunable from 180 nm to 24 microns
  • Continuously adjustable bandpass from 0 to 200 nm
  • Milliwatts of energy
  • Push button start and simple dial the wavelength tunability
  • No ozone venting required
  • An Illuminator that is so easy to use, anyone can use it
  • Compact and portable

Need More Power?

If you need even more power in a tunable light source then we also offer a Tunable KiloArc™ Illuminator. It delivers hundreds of milliwatts of power for about twice the price of the Tunable PowerArc™ Illuminator. 


Consisting of a unique arc lamp housing tightly coupled to a 0.2 meter monochromator, the Tunable PowerArc™ Illuminator is a self aligned illuminator that generates milliwatts of intensity and offers the versatility of continuous wavelength and bandwidth selection. The wavelength can be set manually or, for ultimate flexibility, it can be scanned under computer control. The Tunable PowerArc™ Illuminator could not be easier to operate. The system requires no ozone venting, and with the 75 watt xenon lamp no cooling is required. Simply push the start button and dial the wavelength and bandpass of output that you require. It’s that easy!

Arc Lamp Hardware

Lamp Housing

At the heart of the PowerArc™ lamp housing is a proprietary on-axis ellipsoidal reflector. Our reflectors collect up to 70% of the radiant energy from the arc lamp, versus only 12% for typical condenser systems in vertical lamp housings. The ellipse literally wraps around the arc lamp, collecting 5 to 6 times more output power than a conventional system.

The arc source is located at one focal point of the ellipse, and the radiation is reflected by the ellipse to the secondary focus which is actually outside of the lamp housing. Since the light is brought to a focus by reflection rather than refraction (through a lens), there are less losses from absorption or lens-surface back-reflection. This design is so efficient that a PowerArc™ lamp housing can deliver  up to 11 times more optical power into a given smaller area than a conventional lamp housing. This is critical when illuminating light guides, monochromator slits, pinholes or other small areas.

What this means is simply that you get the same output with a 75 W system as with a conventional 450 W system. You obviously will save money and space.

While conventional lamp housings resemble chimneys emitting ozone and requiring cumbersome venting, the PowerArc™ has a sealed lamp housing that requires no ozone venting.

Ozone-Free Arc Lamp Housing

We call the PowerArc compact arc lamp housing design an ozone free lamp housing regardless of the lamp selected, even in the case of UV enhanced lamps. It is ozone free primarily because it is a sealed lamp housing that is air tight and not air cooled, unlike most arc lamp housings which use air cooling.

The PowerArc lamp housing with UV enhanced lamps has been tested following OSHA safety standards. While some ozone was detected outside the lamp housing, the ozone levels in the test room were well below the safe guidelines. Of course some UV light is delivered outside the lamp housing and into the air in the test room, and you can even detect this by smell, but not enough ozone is created to pose a health risk or require a chimney for venting.

Air cooled lamp housings have a real problem because they blow oxygen at the UV source, and, like blowing oxygen on a fire, this creates problems. One way to get around this problem with an air cooled lamp housing is to select a lamp that has an envelope that does not emit wavelengths below 250 nm. As such even an air cooled lamp housing will not create an ozone problem since there is no UV output outside the lamp itself. The problem with this solution is that many applications require deeper UV wavelengths.

If you require deep UV output for your application then you necessarily require a lamp that emits deep UV wavelengths. For these applications we recommend a UV enhanced lamp and a suprasil front window for the PowerArc lamp housing to get the most UV output you can. Even in this configuration, the sealed PowerArc lamp housing is still considered to be an ozone free lamp housing.

Since oxygen is the principle absorber of light in the 150 to 200 nm range, some applications, such as CD spectroscopy, require nitrogen purging to access the lowest UV wavelengths emitted from UV enhanced xenon lamps (down to about 180 nm). For output in the 180 to 200 nm range you will need to nitrogen purge your optical environment, and also to use no front face window on the lamp housing. The housing is now no longer air tight, but the nitrogen purging negates the concern for ozone creation.

The unique PowerArc design allows you to choose whatever lamp, reflector and front face window is best for your particular optical needs. And the Ozone free design means that your choice is always safe and requires no venting or chimney to deal with.


You have a choice of lamps depending on the spectral output that you require. Of course you may order different types of lamps for the housing, they are interchangeable.

There are two types of arc lamps available—xenon and mercury. The xenon gas used in the lamp provides continuous spectra from 180 nm to 2,500 nm of course at varying intensity (refer to spectral output graph). The mercury provides a line spectra (refer to spectral graph). The spectral curves for xenon and mercury are normalized (relative intensities) therefore it is not obvious that the mercury lamps, intensity—where it emits, exceeds that of the xenon lamp. Because of the smaller arc size, the mercury lamp can also provide greater intensity in a smaller area (greater brightness) than the xenon lamp.

We also have an optional tungsten-halogen filament lamp for NIR applications.

Arc lamps come with a quartz or suprasil envelope depending on the application. Quartz lamps do not transmit the deep UV below 240 nm. Suprasil lamps do transmit  the deepest UV output from the arc down to about 180 nm. For either type of lamp envelope our unique lamp housing design does not create ozone and therefore requires no ozone venting.

Lamp Wattage

Lamp Type

Nominal Arc Gap

75 watt

Compact Arc Xenon

0.8 mm

100 watt

Tungsten Halogen Filament

4 x 2 mm

100 watt


0.25 mm

75 watt

Suprasil Compact
Arc Xenon

1.3 mm

150 watt

Compact Arc Xenon
Ozone free

2.1 mm

150 watt

Compact Arc Xenon

2.1 mm

The 75 watt xenon lamp and 100 watt tungsten-halogen lamps require no cooling whatsoever. The larger wattages of lamps require water cooling.

You can either get your water directly from the cold-water tap (can be a problem if the water is hard or when water is not available) or from an inexpensive circulating water bath option that we provide.

We have selected water-cooling over air: because it allows us to make a more compact housing; seal in the ozone and eliminates the need for venting.


Our ellipsoidal reflectors are proprietary in design and the coating used. They are NOT electro-formed reflectors, which can distort with heat, and can degrade within months. Our proprietary design ensures that distortion of the critical ellipsoid can not occur as the lamp reaches its operating temperature. This ensures thermal stability of focus. The coating ensures reasonably long operating life—typically 3-5 years.

With an PowerArc™ lamp housing you have a choice of three different ellipsoidal reflectors depending on your requirements. The proprietary reflectors HORIBA uses allows for the great 70% collection efficiency. In addition to collection of light the reflectors are used as focusing elements. Hence the selection of a reflector determines the focal length. The different focal lengths correspond to the different “focal cones” of light coming from your lamp housing. This “focal cone” is variously referred to as f/#, Numerical Aperture, and/or acceptance, convergence, or divergence angle.

The f/# is important when considering matching a light source to some other component, for example: fiber optics, liquid light guides or monochromators. However the f/# does not affect the light collection as it does in a simple lens design. The shape and size of the ellipsoidal reflector determines how much light is collected from the lamp arc, and the amount of delivered light is the same for all of OBB’s reflectors. Selection of your reflector f/# is primarily based on matching the focal cone of the converging beam with any secondary optical elements you will be using. However the f/# also determines the focal distance and the focal spot size with lower f/#’s having shorter focal lengths and smaller spot sizes.

The spot size at the focus is directly related to the original arc gap size of the lamp and the focal length of the reflector. The larger the arc, or the longer the focal length, the larger the spot size at the focus. Hence if you want to have the maximum power in the smallest spot select the fastest focal length (f/1) and the smallest arc size lamp (100 W Mercury). This is another unique benefit of the OHORIBA's system; we give you the most power in the smallest spot. No one using an arc lamp can match us in this regardless of their systems size or cost.

Reflector Selection Guide (dimensions are in millimeters)


f/4.5 reflector

f/2.5 reflector

f/1 reflector

Focal length (F)

379 mm

240.5 mm

112 mm

Focal point from housing (X)

284.35 mm

151.46 mm

22.25 mm

Beam angle (a)

14.5 degrees

28 degrees

45 degrees

Numerical Aperture N.A.





The PowerArc™ is a sealed arc lamp housing. You have a choice of the optical front windows, depending on the spectral output that you require. Please refer to the transmission spectra of the three types of windows available. If you plan to use different types of lamps in your lamp housing, you may want to order different windows or select Suprasil since it will transmit all spectra.




Above 350 nm


Above 250 nm


Above 180 nm


Power Supply

The PowerArc™ lamp housing comes with one of two choices for the power supply and igniter.

Dedicated 75 or 100 Watt Power Supply:

If you are only ever going to use the 75 watt xenon lamp or 100 watt mercury lamp with your PowerArc™ lamp housing, then we offer two dedicated compact power supplies and igniter units that are integrated onto the lamp housing. They are specially designed switch mode power supplies offering outstanding stability with a simple push button, electronically safe, ignition. In fact, although they are not DC regulated power supplies, HORIBA carefully designed them to offer virtually identical stability specifications to our linear power supply. When used with the PowerArc™ lamp housing this illuminator offers a very small form at a very affordable price.


Universal 75 to 150 Watt Power Supply:

If you need to use a lamp other than 75 or 100 watts, then we offer a universal highly-regulated, constant current, linear, DC power supply. This universal power supply provides very stable power for arc lamps. It can also be used with a 100 watt tungsten-halogen filament lamp for enhanced IR output. Designed for use with various lamp housings, it may be used with lamp housings from other manufacturers. When used with an arc lamp in OBB’s PowerArc™ lamp housing, this stand alone power supply is connected to a compact igniter that is integrated onto the lamp housing for electronically safe ignition.

The DC regulated power supply pictured below has a current adjust for different operating wattages and can display operating voltage, wattage or current.


Ignition Safe Arc Lamp Igniter

Ignition noise can disrupt, or even destroy, sensitive equipment in the vicinity of an arc lamp during start-up. This can be quite a concern in a crowded lab environment. HORIBA Engineers introduced an igniter that is integrated onto the lamp housing. This design provides an effective EMI shield which contains the EMI pulse, providing a safer and more convenient environment in which to do your research.

Monochromator Hardware

Optional Ports

This extremely rugged monochromator is built from a single solid metal casting that includes the base plate, optical mounts and all four sides of the unit. Inside the monochromator has extensive baffles to reduce stray light. There is an entrance and exit baffle box at the entrance and exit silts, as well as a center baffle that separates the input side from the exit side of the monochromator.

The monochromator has four optional ports that can be utilized for two inputs and two outputs. In the standard configuration it comes with one entrance and one exit port. This gives you a choice of four different input/output geometries:

180° Straight Line – with folding mirrors on entrance and exit

90° Right Angle – with folding mirror on the exit side

90° Left Angle – with folding mirror on the entrance side

360° – with no folding mirrors

180° Straight Line

90° Right Angle

90° Left Angle


You can also elect as an option to have two entrance ports or two exit ports. This option adds an appropriate flipping mirror(s) and slit assemblies. The flipping mirror is manually switched to receive light from either entrance port, or to deliver light to either exit port depending on the configuration.

Dual Exit Ports

Dual Entrance Ports

Dual Entrance and Exit Ports


The monochromator slits are continuously adjustable manual slits with micrometers for adjustment from 0 to 6 mm. The micrometers have a digital readout of the physical slit size selected. The slit housing also has a manually sliding shutter to quickly shut off or open the light path. This manual slider also has a wedge height adjustment to allow you to select a slit height anywhere from 0 to 21 mm.


There is a wide selection of gratings to choose from depending on the optical requirements. All gratings are 50 x 50 mm flat gratings. The Ruled gratings have better optical throughput and Holographic gratings have improved stray light characteristics. Ruled 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 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.

Groove Density

Mechanical Scanning Range (nm)

Reciprocal Linear Dispersion (nm/mm)

2,400 g/mm

0 to 550 nm

2 nm/mm

1,200 g/mm

0 to 1,100 nm

4 nm/mm

600 g/mm

0 to 2,200 nm

8 nm/mm

300 g/mm

0 to 4,400 nm

16 nm/mm

150 g/mm

0 to 8,800 nm

32 nm/mm

An optional dual grating mount allows you to select two different gratings, say to optimize throughput in different wavelength ranges. The gratings are positioned back to back and a switch dial is available at the top of the monochromator to manually choose which grating is to be used.

Below is a list of our standard gratings. Other gratings are also available upon request.

Available Gratings

Part #


Grating Curve


600 g/mm, 1,250 nm blaze

Download Curve


1,200 g/mm 300 nm blaze

Download Curve


1,200 g/mm 400 nm blaze

Download Curve


1,200 g/mm, 500 nm blaze

Download Curve


Holographic grating 300–800 nm

Download Curve


75 g/mm 10.0 µm blaze

Download Curve


150 g/mm, 4.0 µm blaze

Download Curve


300 g/mm, 2.0 µm blaze

Download Curve


600 g/mm, 750 nm blaze

Download Curve


600 g/mm 1.0 µm blaze

Download Curve


1,200 g/mm, 600 nm blaze

Download Curve


1,200 line/mm, 750 nm blaze

Download Curve

Wavelength Control

The monochromator wavelength is controlled with a manual dial and readout. The readout is designed to be in true wavelength in nanometers for the 1,200 g/mm grating. For other gratings you have to multiply the dial readout by a factor depending on the actual grating resolution. For example with the 600 g/mm grating you multiply the digital readout by 2 to arrive at the true wavelength position of the monochromator.

Computer Control

An optional computer control accessory is available. It includes a stepper motor assembly, a USB motor controller interface box and an SDK for control of the monochromator wavelength from third party software packages for users with programming experience.

A very simple software package is also provided by OBB to remotely select the wavelength and control the shutter. Requires Windows 2000 or Windows XP operating system.

Software Screen Shots


*LabVIEW is a trade mark of National Instruments


Tunable PowerArc™ Illuminator Hardware

Coupled together with a rigid adapter tube, the Tunable PowerArc™ Illuminator is a single portable self aligned light source. Below is the schematic for the complete illuminator.

Tunable PowerArc™ Output Curves

You can customize a Tunable PowerArc™ Illuminator to suit your specific needs. The lamp and grating selected primarily determine the performance of the illuminator. However for any given lamp and grating the slit adjustment (or bandwidth) selected will also affect the intensity output of the unit.

Below are a series of intensity output curves for different configurations of the Tunable PowerArc™ Illuminators. There are far too many variables to provide output curves for all possible combinations for these illuminators. If you are interested in an illuminator with a different grating than those shown below, then you can compare the grating curves of that grating with one listed below to get a pretty good idea of how your particular illuminator will perform.

The Tunable PowerArc™ Illuminator can deliver up to 10 milliwatts of tunable light output!

Physical Specifications

Dimensions (WxDxH)31 x 12 x 9 inches 
Weight7.5 lbs 

Optical Performance Specifications

Optical Power> 10 mW (grating, bandpass & wavelength dependent) 
Spot Size at Slit Exit5 to 10 mm (lamp and slit dependent) 
Diverging Beam Angle (full)14.5 degrees 
Numerical Aperture (N.A.)0.12 
Optical Noise0.07% RMS 
Optical Stability0.2% 

75 Watt Switch Mode Power Supply Specifications

Input (user selectable)90–274 V AC, 50–60 Hz 
Power Rating50 to 100 watts 
Operating Voltage10 to 25 volts 
Operating Current3 to 7 amps 
Pre-Ignition Voltage65–75 V DC 
Ripple at Max Current< 3% peak to peak 
Stability After Warm-up0.5% 
Line Voltage Regulation< 0.5% current variation for 5 volts line change 

75 to 150 Watt Universal Power Supply Specifications

Input (user selectable)105–120 V/60 Hz or 210–240 V/50 Hz 
Power Rating0 to 150 watts 
Operating Voltage10 to 24 volts 
Operating Current0 to 8 amps 
Pre-Ignition Voltage> 85 volts 
Ripple at Max Current< 10 millivolts 
Stability After Warm-up0.2% 
Line Voltage Regulation0.1% current variation for 5 volts line change 
Load Regulation0.1% current variation for 50% change in load impedance 
Dimensions4.5 x 10.75 x 12.5 inches, 11.5 x 27.3 x 31.8 cm 
Weight12 pounds, 5.45 kg 

Arc Lamp Spectrum Band Pass Intensity Charts

Xenon Arc Lamp Spectrum

Xenon Arc Lamp Intensity Chart

Wavelength% outputWavelength% outputWavelength%outputWavelength% output 

Mercury/Xenon ArcLamp Spectrum

Mercury/Xenon Arc Lamp Intensity Chart

Wavelength% outputWavelength% outputWavelength%outputWavelength% output 

UV illumination down to 180 nm

Although the spectral output charts above do not show data below 250 nm, the PowerArc can deliver light down to 180 nm, the lowest available wavelength emission of the xenon plasma. Some arc lamps use quartz envelope bulbs that do not transmit UV wavelengths. These lamps are sometimes called ozone free bulbs because they do not emit in the deep UV and hence create ozone when interacting with oxygen in the air. We offer both ozone free and UV enhanced bulb choices, as well as different window materials for the front output of the lamp housing, so that our customers can choose the best components for their requirements.

For requirements below 250 nm please select from one of the two following xenon lamps when requesting your quote.

Part NumberDescription 
14275 W suprasil (extended life) xenon arc lamp, output above 180 nm 
145150 W xenon arc lamp, output above 210 nm 

Higher Resolution Gratings Can Provide Higher Intensities

The data curves above are all from illuminators that had a 1,200 g/mm grating. You will note from these curves that doubling the bandpass, or slit size, typically results in a factor of four increase in intensity. This is true as long as the slit size is the same or equal to the optical spot size. Therefore if you used a 2,400 g/mm grating you would be doubling the slit size from a 1,200 g/mm grating to maintain an equivalent bandpass. Thus a Tunable PowerArc™ Illuminator equipped with a xenon lamp and a 2,400 g/mm grating blazed at 300 nm will give you up to 80 milliwatts of optical power in a 20 nm bandpass. However the 2,400 g/mm grating will only mechanically scan up to 600 nm, see monochromator for more details.

Mounting Information

Please note at the that the mounting information is for the PowerArc™ with the integrated power supply/igniter..


Front View 

Right View

Bottom View

Top View 

Rear View 



Lamp Housing Specfications


Lamp power capacity

75 to 150 watts


100 mm (3.9 inches)


100 mm (3.9 inches)


210 mm (8.3 inches)


1.9 kg (4.2 pounds)

Window Diameter (D)

65 mm


Note: There are M5 or 8/32 tapped holes on the bottom of the lamp housing to allow mounting of the housing to mounting posts.

Power Supply Specifications


75 Watt Switch Mode Power Supply Specifications

Input (user selectable)

90–274 V AC, 50–60 Hz

Power Rating

50 to 100 watts

Operating Voltage

10 to 25 volts

Operating Current

3 to 7 amps

Pre-Ignition Voltage

65–75 V DC

Ripple at Max Current

< 3% peak to peak

Stability After Warm-up


Line Voltage Regulation

< 0.5% current variation for 5 volts line change


Universal Supply Connections for Arc Lamp

Universal Supply Connections for Tungsten Lamp

75 to 150 Watt Universal Power Supply Specifications

Input (user selectable)

105–120 V/60 Hz or 210–240 V/50 Hz

Power Rating

0 to 150 watts

Operating Voltage

10 to 24 volts

Operating Current

0 to 8 amps

Pre-Ignition Voltage

> 85 volts

Ripple at Max Current

< 10 millivolts

Stability After Warm-up


Line Voltage Regulation

0.1% current variation for 5 volts line change

Load Regulation

0.1% current variation for 50% change in load impedance


4.5 x 10.75 x 12.5 inches, 11.5 x 27.3 x 31.8 cm


12 pounds, 5.45 kg

Tunable PowerArc Specification Sheet
Size 0.6 MB


Do you have any questions or requests? Use this form to contact our specialists.

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