TLS120Xe High Power Tuneable Light Source (280 nm — 1100 nm)

  • TLS120Xe. Top, left to right: Wavelength dial, main screen, optical output port (without output optic adapter installed). Bottom: Main power switch, USB connector, feedback photodiode input for lamp alignment, output enable button.
  • Spectral power at a selected central wavelength of 550 nm. (100 W bulb, ⌀ 1.5 mm 0.39 NA High OH SMA fibre, 0.74 mm silt)
  • Output power as a function of selected wavelength for 4 slit sizes. (100 W bulb, ⌀ 1.5 mm 0.39 NA High OH SMA fibre.)
  • A TLS120Xe on an optics table, emitting light at a central wavelength of 522 nm.
  • TlS120Xe modular tuneable light source with FOP-UV liquid light guide.
  • A view of the TLS120Xe internals illustrating the system geometry. The light from the Xenon lamp is focussed on a slit (not shown) in a slit well by the parabolic reflector, dispersed and focused on the second slit (not shown) by the convex holographic grating. The beam passes through a order-sorting filter wheel and is coupled into whatever output optic is available.
  • A view of slits inside the TLS120Xe. The slits can are user-swappable to select different output bandwidths.
  • The output of a SMA fibre coupled TLS120Xe set to a wavelength in the orange part of the spectrum, shone on a piece of paper.
  • The output of a SMA fibre coupled TLS120Xe set to a wavelength in the green part of the spectrum, shone on a piece of paper.
  • The output of a SMA fibre coupled TLS120Xe set to a wavelength in the blue part of the spectrum, shone on a piece of paper.

The TLS120Xe is an easy to use and versatile high-powered source of stable monochromatic and dimmable white light. The output wavelength can be set with an intuitive user interface or over a simple USB protocol to any wavelength within a broad spectral range between 280 nm and 1100 nm. 

Available with a variety of output optics and bandwidths, this compact solution easily fits into a wide range of applications in spectroscopy and spectrophotometry and delivers superlative stability and continuous tuning over its full spectral range.

Applications

The TLS120Xe is suited to a wide range of materials and photodetector characterisation applications in research, industry and OEM, including:

  • Fluorescence imaging
  • Photoluminescence / fluorimeter excitation
  • Detector responsivity / QE evaluation
  • Reflectance and transmittance analysis
  • Thin film deposition monitoring
  • Microscopy
  • CCD / CMOS camera testing

Compact Precision and Power

The TLS120Xe brings together the multiple domains of excellence learnt developing Bentham products into a single, compact form factor.

Details

User Experience

The TLS120Xe features a highly intuitive user interface, consisting of a screen that shows the current peak wavelength and bandwidth, and a dial by which the wavelength can be adjusted. The wavelength dial is programmed with acceleration curves commonly used in computer mice, which allows a fast turn to traverse hundreds of nanometers, while slow turns allow very precise control of the target wavelength. The screen keeps you up to date with the current target, and the TLS moves its grating while you turn the dial, making for a very responsive experience.

A useful additional feature is the ability to switch to white-light mode. This functionality is also easily accessible via this wavelength dial -- if you turn it downwards beyond the lowest wavelength attainable, the TLS transitions to its white-light output mode where the required intensity of white light can be selected.

Output Optics

The TLS120Xe can be ordered with different output fibres or light guides, but this does not restrict you to using this optic. Interchangeable output adapters are available making it quick and easy to switch between different types of fibres and light guides, and custom adaptors are usually simple to manufacture. If your requirements are not listed let us know!

Internal Optics

A view of the TLS120Xe internals illustrating the system geometry. The light from the Xenon lamp is focussed on a slit (not shown) in a slit well by the parabolic reflector, dispersed and focused on the second slit (not shown) by the convex holographic grating. The beam passes through a order-sorting filter wheel and is coupled into whatever output optic is available.

The TLS120Xe contains a high-powered xenon light source in an ellipsoidal reflector that illuminates a concave holographic diffraction grating mounted on a precision angular stage. The white light from the light source is split into its component wavelengths by the diffraction grating. An output slit selects a range of these wavelengths. Unwanted light from higher diffractive orders is removed by means of order sorting filters mounted on a rotating filter wheel, which also functions as a shutter.

Monitor Photodiode

To optimise the xenon lamp alignment after fitting a new bulb, the TLS120Xe features a photodetector with external SMA thread, by connecting the output SMA cable to the built-in photodetector, the positioning of the bulb can be optimised by measuring the light emitted at the end of the output fibre. The photocurrent is shown on the display... or it can be read via USB!

View of the TLS120Xe with the bottom panel removed to show access to the main electronics cavity.
TLS120Xe without casing, showing the optical cavity including the adjustable lamp mount, parabolic reflector, grating, order sorting filter wheel and output optic.

Electronics

Mains electricity enters the TLS120Xe through a filtered IEC mains socket on the rear, which powers a 300 W switch mode power supply. This provides power to all the internal components, which include precision motor drivers, lamp power supply and an ARM-based control board which handles the high-level communications with the user and steers the electronics.

The lamp is powered by a dedicated constant-current power supply, the same type found in our 610 Current Stabilised Power Supplies, that provides extremely smooth, stable power to the xenon lamp. The ignition of the xenon lamp arc requires a short pulse of 30 kV. The electronics to create this pulse are located in the electromagnetically shielded optical cavity to prevent interference.

Software Control

The TLS120Xe is a smart device that contains all of its calibration data, as well as the algorithms and calculations required to reconfigure itself for a certain wavelength, so minimal work is required externally. To further simplify the control scheme:

  • The USB device class is HID, which does not require drivers in any modern operating system, as it is the same class of device used by keyboards and mice.
  • The command protocol consists of SCPI-style text-based commands that are very readable. For instance, you can turn your lamp on with the command "LAMP ON". For all the available commands, please see the TLS120Xe communication manual.
  • No Bentham software is required on the host computer, but we do provide some software to simplify things. For instance, we publish a crossplatform Python package bendev, which is open source, available with the permissive MIT license, and can be installed with "pip install bendev". A windows SDK with a simple control library and a terminal is also available.

Specifications

Output Power

Varies by selected wavelength, lamp, slit, and output optic. See configuration page.

Light Source

Primary Source Type Short-arc OFR Xenon lamp
Drive mode Constant current
Coupling Ellipsoidal reflector, 60 mm diameter

Optomechanics

Grating mount Single grating on-axis turret
Grating type Concave blazed holographic
Grating line density 1200 grooves per mm
Nominal blaze wavelength 380 nm
Slit type Fixed
Drive type Stepper motor
Wavelength accuracy ± 0.1 nm mechanical capability, source features affect accuracy
Drive resolution 0.5 arcsec per step
Maximum drive speed 115° per sec
Switching speed <10 ms for 100 nm

Optical Layout

Configuration Constant Deviation Angle
Focal length 120 mm effective

Local Control

Display Wavelength, bandwidth, current stability, burn time
Controls Wavelength, output, mains power (normal mode); white light intensity (dimming mode)

Remote Control

Interface USB2.0
USB device class HID
Software Control SCPI over USB, terminal, SDK, python scripting. Compatible with BenWin+
PC Host compatibility Windows, Linux, Mac OS

Optical Performance

Wavelength range 280 nm - 1100 nm
Wavelength step 0.0035 nm
Wavelength accuracy bandwidth dependent due to Xenon source spectrum
Bandwidth at FWHM with 0.74 mm slit 5 nm
Bandwidth at FWHM with 1.48 mm slit 10 nm
Bandwidth at FWHM with 2.96 mm slit 20 nm
Bandwidth at FWHM with 5.92 mm slit 40 nm

Mechanical

Length 300 mm
Width 460 mm
Height 185 mm
Weight 8.8 kg
Orientations Horizontal only

Electrical

Mains Voltage 100 V – 240 V AC
Mains Frequency 50 Hz – 60 Hz
Line fuse 5 A slow blow (rated for 250 V AC)
Mains supply voltage fluctuations up to 10% of nominal voltage
Transient voltages up to overvoltage category 2

Environmental Requirements

Operating temperature range 5 °C - 40 °C
Operating humidity range Maximum relative humidity 80 % for temperatures up to 31 °C decreasing linearly to 50 % relative humidity at 40 °C
Altitude < 2000 m
Environment pollution category Category 2

Optical Radiation Hazards

Designation Warning User Information
Actinic UV WARNING: UV emitted from this product. Avoid eye and skin exposure to unshielded product
Near UV NOTICE: UV emitted from this product. Minimise exposure to eyes. Use appropriate shielding
Blue light CAUTION:Possibly hazardous optical radiation emitted from this product. Do not stare at operating lamp. May be harmful to the eyes.
Infrared eye NOTICE: IR emitted from this product. Use appropriate shielding or eye protection.

Other Hazards

Internal hazards Place in safe state before opening. Consult user manual.
Other Hazards Consult user manual before use.

Compliance with EU Council Directives

Electromagnetic Compatibility Directive 2014/30/EU
Low Voltage Directive 2014/35/EU

Compliance with harmonised standards

Electrical equipment for measurement, control and laboratory use. EMC requirements - General requirements EN61326-1:2013
Electromagnetic compatibility (EMC) - Limits. Limits for harmonic current emissions (equipment input current ≤16 A per phase) EN61000-3-2:2014
Electromagnetic compatibility (EMC) - Limits. Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection EN61000-3-3:2013
Safety requirements for electrical equipment for measurement, control, and laboratory use - General requirements EN61010-1:2010+A1:2016

TLS120Xe Configuration Options

There are three main aspects of the TLS120Xe that are configurable:

  • The primary xenon light source determines the overall maximum output power of the TLS120Xe. The main difference between the two light choices available is that the higher power one has a much sharper cathode, resulting in a smaller plasma source which can be more efficiently be coupled into output optics. This results in significant brightness gains but reduced lifetime. Since the TLS120Xe is configured to provide the current specific to these light bulbs, changing between them is not a trivial operation. For this reason, the choice of light bulb determines the exact model of TLS120Xe to order.
  • The bandwidth is set by the slit widths, and the user can swap between slits of different widths. The trade-off between wide and narrow slits are primarily output power and bandwidth, but wide bandwidth slits also let through more of the xenon source's spectral features.
  • The output optic is something the user can easily swap if the correct adapters are to hand. The trade-off between the various available options is spectral range, throughput, and cost.

Main Configuration

TLS120Xe main configurations

Xenon Lamp Optimised for Drive CurrentLamp lifetimeTLS120Xe Part #
75 W long life 5.4 A 3000 hours (typical) TLS120Xe-75W
100 W brightness 7.0 A 500 hours (typical) TLS120Xe-100W

Bandwidth and Wavelength accuracy

The bandwidth of light emitted by the TLS120Xe can be managed by chosing particular slit widths. While narrower slits select a narrower spectral region, wider slits allow more of the spectrum to pass through. Having wider slits increases the overall output brightness.

The cost of wider slits is that a broader spectral range of the source light is allowed to pass through the device, complete with the spectral features that are present in the source. This means that both the peak wavelength and bandwidth may be different from the expected values. 

For narrow slits, the spectral filtering of the slits dominate the output spectral shape resulting in a well-defined peak:

  • lower output power
  • highest wavelength accuracy
  • most accurate bandwidth
  • overall intensity varies strongly with xenon spectral features in regions with sharp emission peaks

For wide slits, the spectral features of xenon may dominate the output spectral shape resulting in a bright but uneven peak:

  • higher output power
  • lower wavelength accuracy
  • bandwidth less well-defined
  • less overall variation in intensity

Output power as a function of selected wavelength for 4 slit sizes. (100 W bulb, ⌀ 1.5 mm 0.39 NA High OH SMA fibre.)
Output power as a function of selected wavelength for 4 slit sizes. (100 W bulb, ⌀ 1.5 mm 0.39 NA High OH SMA fibre.)
Spectral power as a function of selected wavelength for 4 slit sizes. Wider slits show more of the underlying Xenon spectrum. The 900 nm central wavelength graph was chosen as a particularly feature-rich region. (100 W bulb, ⌀ 1.5mm 0.39 NA High OH SMA fibre)
Spectral power as a function of selected wavelength for 4 slit sizes. Wider slits show more of the underlying Xenon spectrum. The 900 nm central wavelength graph was chosen as a particularly feature-rich region. (100 W bulb, ⌀ 1.5mm 0.39 NA High OH SMA fibre)

Bandwidth Options

Nominal BandwidthSlit WidthOrder Code
5 nm nominal 0.74 mm SA-FSP(0.74)
10 nm nominal 1.45 mm SA-FSP(1.45)
20 nm nominal 2.90 mm SA-FSP(2.9)
40 nm nominal 5.92 mm SA-FSP(5.92)
others available Contact us!

Output Optics

The choice of output optics is generally motivated by application requirements, wavelength range, and cost. Generally wider optics are easier to couple light into, resulting in intensity gains. Output optics with different connectors require different output couplers, but these are user-swappable.

Output optic options

Output opticWavelength RangeLengthDiameterPart #output couplerMonitor port adapter #
SMA fibre 250 nm – 1200 nm 1 m 1.5 mm SMA-1500-1000 45937
UV grade fused silica fibre bundle 200 nm – 1350 nm 1 m 4 mm FIBRE-UV-4-4-1000 45936 46888
Liquid light guide 280 nm – 700 nm 1 m 3 mm LLG-3-1000 45935 46915
Your own SMA fibre 45937
Other optic contact us contact us

Spares

Spare bulbs are available from Bentham or from their respective manufacturers. Each TLS120Xe ships with its output current matched to the particular bulb type that it ships with. Do not fit a bulb requiring a different current.

Spare Bulbs

TLS120Xe Part # Xenon Lamp Lamp Part #
TLS120Xe-75W Long Life 19589
TLS120Xe-100W High Power 19719

Dimensions

Dimensions
Width 462 mm
Height 184 mm
Depth 300 mm
Additional rear clearance required 100 mm
Weight 8.8 kg
Orientations Horizontal only

Measurement

Choose from the subtopics on the left to learn more about the output of the TLS120Xe in various configurations, including a comparison between and overviews of the 75W and 100W models, as well as individual output plots including, at various bandwidths:

  • the spectral power (mW/nm as a function of wavelength) at a variety of target wavelengths
  • the integrated output power at each target wavelength (the total power emitted for each individual wavelength target).

Comparison: 100W, 75W

Configuration
Device TLS120Xe-75W and TLS120Xe-100W
Output coupler 45937
Output optic SMA-1500-1000
Slit width various

Typical power as function of target wavelength

5nm Bandwidth

10nm Bandwidth

20nm Bandwidth

Overview: 75W, 1.5mm

Configuration
Device TLS120Xe-75W
Output coupler 45937
Output optic SMA-1500-1000
Slit width various

Output power at each wavelength setting

Spectral output at several bandwidths and wavelengths

Overview: 100W, 1.5mm

Configuration
Device TLS120Xe-100W
Output coupler 45937
Output optic SMA-1500-1000
Slit width various

Output power at each wavelength setting

Spectral output at several bandwidths and wavelengths

75W, 5nm BW, 1.5mm

Configuration
Device TLS120Xe-75W
Output coupler 45937
Output optic SMA-1500-1000
Slit width 0.74mm

Typical output power

Spectral output power at various wavelengths

75W, 10nm BW, 1.5mm

Configuration
Device TLS120Xe-75W
Output coupler 45937
Output optic SMA-1500-1000
Slit width 1.48mm

Typical output power

Typical spectral output power at various wavelengths

75W, 20nm BW, 1.5mm

Configuration
Device TLS120Xe-75W
Output coupler 45937
Output optic SMA-1500-1000
Slit width 2.90mm

Typical output power

Typical spectral output power at various wavelengths

100W, 5nm BW, 1.5mm

Configuration
Device TLS120Xe-100W
Output coupler 45937
Output optic SMA-1500-1000
Slit width 0.74mm

Typical output power

Spectral output power at various wavelengths

100W, 10nm BW, 1.5mm

Configuration
Device TLS120Xe-100W
Output coupler 45937
Output optic SMA-1500-1000
Slit width 1.48mm

Typical output power

Spectral output power at various wavelengths

100W, 20nm BW, 1.5mm

Configuration
Device TLS120Xe-100W
Output coupler 45937
Output optic SMA-1500-1000
Slit width 2.90mm

Typical output power

Spectral output power at various wavelengths

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