Laser-ARPES

Laser-ARPES

with a 190 nm / 6.5 eV ps UV Laser Source


Angle-Resolved Photo-Emission Spectroscopy with a Laser

Laser-based ARPES (Angle-Resolved Photo-Emission Spectroscopy) is a form of ARPES that uses a laser as an excitation source. Laser-based ARPES is operated with a narrow bandwidth UV laser source and offers several advantages over synchrotron radiation: A laser fits on a table (ok… a large table), and experiments can be performed at any time and independently of rare beam times in synchrotron facilities.

More technically speaking, a narrow-band UV laser offers a contantly high photon flux with an extremely high energy resolution of up to 0.1 meV. For comparison, the energy resolution of synchrotron radiation is typically in the range of 5 – 20 meV – and is therefore worse than the resolution of a good energy analyzer with about 1 meV.

The photon energy of the laser source can be varied between 5.77 eV and 6.5 eV. As these are low-energy photons, the Angle-Resolved Photo-Emission Spectroscopy benefits because the bulk sensitivity is significantly enhanced and the momentum resolution increased (compared to synchrotron radiation).

Low-energy photons are sufficient to induce photoemission in many samples. However, it should be noted that due to the lower photon energy compared to synchrotron radiation, Laser-ARPES is particularly suitable for the measurement of electronic states close to the Fermi level.

Laser ARPES/ARUPS with a High-Power UV Source

Tunable deep-UV pulses from 190 … 215 nm / 6.5 … 5.77 eV are available with APE’s ARPES-laser source, constiting of a HarmoniXX FHG in combination with Levante Emerald HP.

The energy-tunable system provides high laser power in the range of several mW. Its brillant and monochromatic laser light is ideally suited for high-resolution ARPES (Angle-resolved Photoemission Spectroscopy) or ARUPS (Angle-resolved Ultraviolet Photoemission Spectroscopy).

  • Tunable (Vacuum)-UV from 190 … 215 nm / 6.5 … 5.77 eV
  • Extremely narrow spectral bandwidth of < 0.2 meV
  • High photon flux of > 10^15 photons/s
  • Exceptional beam quality of M2 < 1.2
  • Automated wavelength tuning via software
  • Ideally suited for table-top laser-based ARPES / ARUPS

Laser ARPES/ARUPS with a Narrow Spectral Bandwidth Down to 0.1 meV


ARPES on Graphene/Ir(111)

The following measurement were performed with APE’s 190 nm / 6.5 VUV system. The ARPES measurement were taken on a SPECS GmbH system with a PHOIBOS 150 hemispherical analyzer and a 2D-CCD detector.

ARPES maps of graphene/Ir(111) sample measured with laser around normal emission geometry showing the Rashbasplit of graphene/Ir(111) surface state. Two different entrance slits of the Electron Analyzer were used, resulting in different energy resolution (marked in the figure).

Graphene/Ir(111).RT
hv = 6.31 eV
Lens mode: WAM
Nr of energy points: 251 (Sweep mode)
Nr of 0-angle channels: 300

Dependence on Temperature. 3D ARPES data sets for graphene/Ir(111) sample measured with laser (lens mode: WAM). Measurements were performed at T=300 K (RT, see image) and T=120 K (LT, not shown here).

Graphene/Ir(111).LT
polar β-scan around NE
hv = 6.31 eV
Nr of energy points: 251
Nr of Θ-angle channels: 300
Nr of β-angle steps: 101
Total acquisition time: 50 min


Turning Complexity into a Turn-Key System

This light source enables spectroscopy and pump probe measurements in the deep UV range < 200 nm. The system consists of the following sub-components:

Creating a 190 nm / 6.5 eV Table-top System

HarmoniXX FHG

The HarmoniXX allows access to the wavelength range of 190 … 215 nm (6.5 … 5.77 eV) by mixing the THG with a fundamental wavelength to create the fourth harmonic. The harmonic pulses are of narrow bandwidth nature, enabling a high resolution across the entire tuning range.

Levante Emerald HP OPO

The generation of high power tunable UV radiation is based on a widely tunable picosecond OPO with computer controlled tuning, pumped by an industrial high power green laser and with subsequent frequency conversion to reach UV wavelengths below 200 nm.

Pump Laser

Paladin 532 – 20000 from Coherent Inc. is ideal for pumping the OPO. It is enabling a wide tuning range and high-average powers of the OPO output. Of course, other pump lasers can be incorporated into the setup as well.

Specifications

Specification Laser-ARPES
Levante Emerald + HarmoniXX FHG (incl. THG, SHG)
Wavelength Range192.5 … 210 nm | 6.44 … 5.9 eV (FHG 3+1)
210 … 230 nm | 5.90 … 5.39 eV (FHG 2+2)
235 … 330 nm | 5.28 … 3.76 eV (THG)
350 … 480 nm | 3.54 … 2.50 eV (SHG)
< 690 … 990 nm (Levante Emerald OPO Signal)
Power Output> 0.25 mW at 200 nm | 6.20 eV (FHG 3+1)
> 0.15 mW at 220 nm | 5.64 eV (FHG 2+2)
> 14 mW at 267 nm | 4.64 eV (THG)
> 52 mW at 400 nm | 3.01 eV (SHG; THG components removed)
> 1750 mW at 800 nm
Pulse Widthapprox. 7 ps
Spectral Bandwidth10 pm | 0.32 meV at 196 nm | 6.33 eV
Repetition Rate80 MHz
M2< 1.2 (typical 1.1)
PolarizationLinear / Horizontal
Pump Laser
Wavelength532 nm
Power~10 W
Pulse WidthApprox. 7 ps
ManufacturerEdgewave (PXz50-2-GF)
Software
SoftwareIncluded
Remote ControlPossible via USB / Ethernet TCP/IP / Serial RS232

Datasheets & Brochures

Application Note


Contact Us







I consent to APE's data safety & privacy conditions.

You need to consent to APE's data safety & privacy conditions before the "send" button is active. You find the data safety & privacy conditions here.

or

Email & Phone Contacts

APE has distributors around the world to give you the best support. Choose a country to find your local sales contact:

APE Angewandte Physik & Elektronik GmbH
Plauener Strasse 163-165 | Haus N
13053 Berlin, Germany

Phone: +49 30 986 011-30
Fax: +49 30 986011333

Sales: sales@ape-berlin.de
Support: service@ape-berlin.de

Coherent Scientific pty. Ltd.
Hilton SA 5033, South Australia

Phone: +61 8 8150 5200
Email: sales@coherent.com.au
Website: www.coherent.com.au

APE Angewandte Physik & Elektronik GmbH
Plauener Strasse 163-165 | Haus N
13053 Berlin, Germany

Phone: +49 30 986 011-30
Fax: +49 30 986011333

Sales: sales@ape-berlin.de
Support: service@ape-berlin.de

PulsePower Technology Ltd.
Beijing, Haidan District
China 100090

Phone:+86 10 62565117
Email: mlu@pulsepower.cn
Website: www.pulsepower.cn



Pinnacle Scientific Cooperation
Hangzhou, Jianggan District
China 310020

Phone: +86 571 88225151
Email: sales@psci.cn
Website: www.psci.cn

OptiXs
199 00 Praha 9, Česko

Phone: +420 212 247 293
Email: info@optixs.cz
Website: www.optixs.cz

APE Angewandte Physik & Elektronik GmbH
Plauener Strasse 163-165 | Haus N
13053 Berlin, Germany

Phone: +49 30 986 011-30
Fax: +49 30 986011333

Sales: sales@ape-berlin.de
Support: service@ape-berlin.de

Optoprim
F 92170 Vanves, France

Phone: +33 1 419 061 80
Email: info@optoprim.com
Website: www.optoprim.com

Laser Sciences Services Pvt. Ltd.

Phone: +91 2778 1673
Email: sales@laserscience.in
Website: www.laserscience.co.in/

Ammo Engineering E.O.(1995) Ltd.
Petach Tikva 49171, Israel

Phone: +972 3 9239 666
Email: shmuelr@ammo.co.il
Website: www.ammo.co.il

Optoprim Srl.

UFFICIO DI MONZA
Via Rota, 37
20900 Monza (MB)

Phone: +39 039 834977
Email: info@optoprim.it
Website: www.optoprim.it

UFFICIO DI ROMA
Via Monte Giberto, 15
00138 Roma

Phone: +39 06 87657838
Email: info@optoprim.it
Website: www.optoprim.it

Phototechnica Corporation
Saitama 336-0017, Japan

Phone: +81 48 871 0067
Email: voc@phototechnica.co.jp
Website: www.phototechnica.co.jp

RayVis
Seoul 137-862, Korea

Phone: +82 2 3461 1103
Email: sales@rayvis.co.kr
Website: www.rayvis.co.kr

STARK SCIENTIFIC S.A. DE C.V.
Guty Cardenas 147, Guadalupe Inn
Ciudad de Mexico, C.P. 01020, Mexico

Main Contact: Vicente Garcia Gomez

Phone: +52 555 401 8254
Email: sales@starkscientific.com

Eurotek International
02-668 Warsaw, Poland

Phone: +48 22 843 79 40
Email: eurotek@eurotek.com.pl
Website: www.eurotek.com

Innova Scientific S.L.
28290 Las Rozas de Madrid, Espana

Phone: +34 91 7105650
Email: info@innovasci.com
Website: www.innovasci.com

AceXon Technologies Pte. Ltd.
Singapore 658065

Phone: +65 6565 7300
Email: sales@acexon.com
Website: www.acexontech.com

Innova Scientific S.L.
28290 Las Rozas de Madrid
Espana

Phone: +34 91 7105650
Email: info@innovasci.com
Website: www.innovasci.com

APE Angewandte Physik & Elektronik GmbH
Plauener Strasse 163-165 | Haus N
13053 Berlin, Germany

Phone: +49 30 986 011-30
Fax: +49 30 986011333

Sales: sales@ape-berlin.de
Support: service@ape-berlin.de

SuperbIN Company Ltd.
5F., No. 41, Ln. 15, Sec. 6, Minquan E. Rd., Taipei 114
Taiwan, R.O.C.

Phone: +886-2-2793-0866
Fax: +886-2-2793-0855
Email: info@superbin.com.tw
Website: www.superbin.com.tw

APE Applied Physics & Electronics, Inc.
Vancouver | WA | USA

Phone: +1 888 690 3250
Sales: sales@ape-america.com
Support: service@ape-america.com

Questions or Ideas?

Do not hesitate to contact us if you have questions or if you are looking for different specifications.

Our colleagues from R&D will be happy to dicuss your requirements in detail.