Echelle spectrometer / Echelle spectrograph (LIBS)

ESA 4000plus

ESA 4000plus - Echelle spectrometer
ESA 4000plus - Echelle spectrometer

The Echelle spectrometer / Echelle spectrograph
ESA 4000plus is a compact device based on an ICCD camera for UV/VIS measurements. The device can be coupled with different radiation sources (e.g. lasers) for atomic spectroscopy applications.

A spectral resolution in the pm range is achieved within the spectral range from 200 nm to 780 nm or 191 nm to 420 nm. The ESA 4000plus is the successor of the Echelle spectrographs ESA 3000 and ESA 4000, now including an updated electronic unit for controlling any kind of external excitation sources.

Furthermore, the camera board has been re-designed to reduce the readout noise significantly.

ESA 4000plus is widely used for research and development as well as quality control purposes.

Echelle Spectrometer ESA4000plus with electronic control unit (Industrial PC, fast pulse generator and cooling unit) available as LAB and OEM model:
■ ESA 4000plus – LAB Basic device, tabletop unit for use in and outside laboratory
■ ESA 4000plus – OEM 19” rack configuration for industrial process integration

Applications include:
LIBS-analysis of material composition of technical glasses or micro analytical evaluation of tool steel.

LIBS - Atomic Emission Spectroscopy

Molecular and Absorption Spectroscopy

For analytical applications in atom spectroscopy, the relevant atom lines of the elements need to be assessed quantitatively. Complex materials are characterised by a large number of atom lines, which interfere in case of insufficient spectral resolution. Often exaltation of the atom lines is a dynamic process, requiring time resolved recording of the spectral lines. The resulting requirement is simultaneous recording of an as large as possible spectral range with a resolution of a few picometers, which is achieved by an Echelle spectrograph with ICCD camera. The optional integration of an image intensifier further increases the light sensitivity and performs as an optical shutter with up to a few nanoseconds exposure time. This configuration permits time correlated measurements or decay measurements. Control of external radiation sources, e. g. of lasers, as well as to that control time correlated measurement of secondary light radiation, qualify the spectrometer ESA 4000 (PDF) for the Laser Induced Breakdown Spectroscopy (LIBS) and for applications for simultaneous multi-element analysis.

Technical specification Echelle spectrograph

Technical specification ICCD- camera

CCD camera KAF-1001 (1024 x 1024 px)
Image intensifier Proxitronic, UV enhanced S20 photocathode
Gateable from 20 ns to 16 s

Equipment for Echelle spectrometer / Echelle spectrograph

Equipment for ESA 4000plus

Optional equipment of delievery are:

■ Zinc - Argon light source
■ Deuterium tungsten source
■ Mercury - Argon light source
■ Laser energy meter LEM2420
■ Fiber optic beam probe (UV quartz)
■ UV fiber cable

Details to the listed equipment below.

Zinc - Argon light source

Zinc - Argon light source
Zinc - Argon light source

Zinc-Argon light source by LLA Instruments is used for wavelength calibration in the UV spectral range.

The unit is mounted in a separate aluminum box with an SMA-socket for optical fiber mounting.

Technical specification

Front of unit Fiberoptic connector
SMA 905 compatible
Back of unit ON/OFF – switch
10mA / 18mA diverter switch
LED - indicates power status
Power input 115 V~ or 230 V~ 50/60 Hz
Fuse block
Dimensions 165 mm x 115 mm x 115 mm
Power consumption 50 VA

Spectral lines zinc

Element Wavelength Io Intens.
Zn 202.547 II 500
Zn 206.200 II 500
Zn 213.855 I 800
Zn 277.086 I 300
Zn 277.098 I 300
Zn 280.087 I 400
Zn 303.578 I 200
Zn 307.206 I 200
Zn 307.590 I 150
Zn 328.233 I 500
Zn 330.258 I 800
Zn 330.294 I 700
Zn 334.502 I 800
Zn 334.557 I 500
Zn 468.014 I 300
Zn 472.215 I 400
Zn 481.053 I 400
Zn 636.234 I 1000

Spectral lines Argon

Element Wavelength Io Intens.
Ar 696.543 I 10000
Ar 706.722 I 10000
Ar 714.704 I 1000
Ar 727.294 I 2000
Ar 738.398 I 10000
Ar 750.387 I 20000
Ar 751.465 I 15000
Ar 763.511 I 25000
Ar 772.376 I 15000
Ar 772.421 I 20000
Ar 794.818 I 20000
Ar 800.616 I 20000
Ar 801.479 I 25000
Ar 810.369 I 20000
Ar 811.531 I 35000
Ar 826.452 I 10000
Ar 840.821 I 15000
Ar 842.465 I 20000
Ar 842.465 I 20000
Ar 852.144 I 15000
Ar 866.794 I 4500
Ar 912.297 I 35000
Ar 922450 I 15000


Deuterium Tungsten source

Deuterium tungsten lamp
Deuterium tungsten lamp

System FibreLight® by Heraeus

The deuterium tungsten source is used for calibration of spectral orders of the Echelle spectrograph ESA 4000.

The FiberLight® System is a complete UV-Vis light source with a shine-through design deuterium – tungsten lamp unit. All elements are mounted on a printed circuit board driven by an external 12 VDC/600 mA power supply. The unit is mounted in a separate aluminum box with an SMA-socket for optical fiber mounting.

Device setup

Front of unit Fiber optic connector
SMA 905 compatible
LED indicates power status
Back of unit ON/OFF-switches for power
Tungsten and Deuterium lamps
Power input - 12VDC
Power supply External
Input 230/110 VAC
Output 12 VDC, 1000 mA
Dimensions 165 mm x 115 mm x 50 mm

Technical specification

Parameter Standard FiberLight DTM 6/10, 6/11, 6/50, 6/51
Spectral distribution 200 - 1100 nm, optional 185 - 1100 nm
Power consumption 6 Watt
Power requirements 12 Vdc / 0,6 Adc
Operating ambient temperature +5 °C up to +35 °C
Relative humidity Max. 90 %, non condensing
Tungsten lamp Yes
External control Lamp (D2, W-lamp) ON/OFF independently shutter
open/close status signal for power ON/OFF
Light exit Focused or collimated beam
Optical fiber diameter 200 µm, 400 µm, 600 µm
Optical fiber connector SMA 905
Numerical aperture (NA) D2 lamp 0,245, W-lamp 0,057
Cooling Not requirend
Deuterium Lamp  
Spectral distribution 200 nm - 400 nm line free
Window material Fused quartz, fused synthetic silica
Light output (radiant intensity) ≥ 5 x 10-8/Wsr @ 240 nm
Stability ≤ 1 x 10-3 AU
Drift ≤ 0,25 %/h
Exciting frequency 250 kHz
Operation voltage Approx. 1 kV
Life ≥ 1000 h @ 240 nm (50 % intensity loss)
Power consumption Approx. 3 Watt
Tungsten Lamp  
Spectral distribution 400 nm - 1100 nm
Voltage 5 Vdc
Current 45 mAdc
Life ≥ 2000 h


FiberLight(R) Spectral Distribution and Lamp Life Characteristics

Mercury-Argon light source

Mercury - Argon light source
Mercury - Argon light source

Mercury-Argon light source by Ocean Optics is used for evaluation of the achieved spectral resolution and monitoring of wavelength calibration.

The unit is mounted in a separate aluminum box with an SMA-socket for optical fiber mounting.

■ Spectral lines of Mercury - Argon light source

Technical specification

Front of unit Fiber optic connector
SMA 905 compatible
LED - indicates power status
Back of unit ON/OFF – switch
Power input – 12VDC
Battery compartment: Use only 9V E-Block Battery VARTA Type 4022 Alkaline
Power suplpy: input 230/110 VAC, output 12 VDC, 1000 mA
Dimension 141 mm x 124 mm x 53 mm

Laser energy meter LEM2420

Laser energy meter LEM2420
Laser energy meter LEM2420

The LEM2420-system consists of a pyroelectric sensors (PEM) and the electrical read-out unit Pyrobox for signal pre-processing and post processing.

The output signal will be transferred to a connected PC via USB. To display the measured values, a user friendly software is also available. The Pyrobox communicates with the computer using ASCII code and is very easy to integrate into your own existing software program or system. It is an inexpensive solution for long time tests, stability tests and OEM applications. Pyrobox can be controlled via ESAWin software of the Echelle spectrograph (ESA 4000). Therefore a direct measurement is synchronisable to the clock rate of the spectra recording. Main applications for this detector are pulse lasers with high power density (Excimer-, CO2-,TEA-, Nd-YAG-Laser).

There are different types of sensors that serves in a wide range of applications due to a high damage threshold, a short time constant, relatively high sensitivity and high aperture. By using PEM 20K an energy range of 500μJ - 3 J is detectable. A special feature is a switch on the backside of the PEM45K allowing a choice between high sensitivity or a short time constant.

Technical specification sensors

Sensor PEM 45K PEM 20K
Diameter of active area 45 mm 20 mm
Sensitivity 1,5 ... 3,5 V/J at 1 MOhm
0,5 ... 1,5 V/J at 100 kOhm
10 ... 15 V/J at 1 MOhm
Max. repetition rate 30 Hz at 1MOhm
70 Hz at 100 kOhm
30 Hz at 1 MOhm
Max. average power 10 W 5 W
Detection threshold 1 mJ < 1 mJ
Accuracy ± 5 % ± 5 %
Connector BNC BNC
Dimension (Ø x length) 68 mm x 53 mm 46 mm x 47 mm

Permissible power- and energy densities at selected wavelengths

Laser Peak power density
Energy density
Excimer, 300 nm, t = 20 ns 50 MW/cm2 1 J/cm2
Nd:YAG, THG, 355 nm, t = 7 ns 65 MW/cm2 450 mJ/cm2
Nd:YAG, SHG, 532 nm, t = 8 ns 70 MW/cm2 560 mJ/cm2
Nd:YAG, 1064 nm, t = 8 ns 120 MW/cm2 970 mJ/cm2
CO2TEA, 10,6 µm, t = 0,5 µs 10 MW/cm2 5 J/cm2

Spectral absorption

Fiber optic beam probe (UV quartz)

Fiber optic beam probe (UV quartz)
Fiber optic beam probe (UV quartz)

The fiber optic beam probe is used for collimation of the plasma light into the fiber and consists of two fused silica lens. The front lens is exchangeable for selection of different sample distances.

There are plano-convex lenses for the following working distances:
200,100, 80, 60, 50, 40, 30, 20 or 15 mm.

The probe has an SMA connector to fix an optical fiber.

Schematic illustration of a fiber optic beam probe

Schematic illustration of a fiber optic beam probe

UV fiber cable

UV fiber cable
UV fiber cable

Length of the standard UV fiber cable for Echelle spectrometer ESA 4000 is 1.5 m.

Other fiber lengths are available on request.

Technical specification

Length 1.5 m
Type Polymicro FOA FVP600660710 UVM
Core/cladding 600/600 µm
Coating material Polyimide 710 µm
UV - solarisation resistant
NA 0.22
Attenuation 1.1 dB/m at 200 nm
Hose V2A stainless steel jacket (diameter 6.5 mm) with shrunk-on plastics tube
Connector F-SMA double-sided