Ultra-short pulsed fiberlaser system for sensitive laser ablation ionisation mass spectrometry

Transcription

1 NCCR MUST Industrial Project Program: fs-ionight Ultra-short pulsed fiberlaser system for sensitive laser ablation ionisation mass spectrometry Manuel Ryser, Andreas Riedo, Peter Wurz, Thomas Feurer Laser Physics Divison - Space Research and Planetary Sciences Division - IONIGHT annual meeting 2014

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4 the product Laser Ablation Ionization Mass Spectrometer > Ablation and ionization of sample material is achieved by a laser pulse > Reflectron time-of-flight mass spectrometer Small, Lightweight, Low Power 160mm x 60mm, 1.5kg, 4W Performance as good as large laboratory instruments > Unique Analytical Advantages No sample preparation No reference samples Low sample consumption ~fg-ng > Potential applications: semiconductors, material science R&D, gem fingerprinting, geology, university research, reverse engineering, forensic analyses, food industry, healthcare, environmental pollution

5 the company IS a spin-off of the Space Research and Planetary Sciences Division, University of Bern AIMS at producing leading-edge Laser Mass Spectrometers BUILDS on proven technology for space exploration Months Service-LMS Lab-LMS Field-LMS Analysis service. The prototype instrument is fully operational. Software, electronic and mechanical engineering work need to be mastered in order to make the product end-user friendly. Development of miniature and customized ultra-short pulsed laser system (M. Ryser, PI Feurer)

6 IONIGHT Team and Advisory Board Andreas Riedo PHD Géraldine Brügger senior manager finances Advisory Board Mario Gruber engineer software mass spectrometry Davide Lasi project manager management Prof. P. Wurz Prof. T. Feurer PD. M. Tulej R. Jendly Dr. D. Piazza Jürg Jost engineer electronics Manuel Ryser PHD optics/laser technology Prof. K. Mezger

7 IONIGHT wins AXA Innovation Award 2013 October 30, 2013

8 fully operational prototype system raw data > Single laser shot mass spectrum collected within ~13ms (lead isotopes), analysis in few s > Metallic and non-metallic elements with concentrations down to 10ppb can be detected > Mass resolution m/δm : (measured at Fe) > Dynamic range: 10 6 /channel and > 10 8 by using detector-rings at different gains Riedo, A., et al. (2013). Performance evaluation of a miniature laser ablation time-of-flight mass spectrometer designed for in situ investigations in planetary space research. Journal of mass spectrometry : JMS, 48(1), 1 15 Riedo, A., et al. (2013). Coupling of LMS with a fs-laser ablation ion source: elemental and isotope composition measurements. Journal of Analytical Atomic Spectrometry, 28(8),

9 3D chemical imaging 3D chemical imaging of heterogeneous material with high spatial (lateral and vertical) resolution and sensitivity possible. > sample: Allende meteorite section > spotsize of Ø 3.5 µm, wavelength 775nm, rep. rate 1kHz, scanning step-width 30 μm > vertical resolution obtained with steel sample: nm; depth tens of µm Riedo, A., et al. (2013). Coupling of LMS with a fs-laser ablation ion source: elemental and isotope composition measurements. Journal of Analytical Atomic Spectrometry, 28(8),

10 laser parameters for field-lms TM Laser source for Parameter studies in the lab: Ti Sapphire femtosecond laser system (CPA system, Clark-MXR Inc., USA) Optimal source for stochiometric ion production: pulse width: repetition rate: pulse energy: wavelength: beam quality: < 500 fs / cold ablation 50 khz (time of flight window of 20µs) > 1 µj (ablation spot of ~5µm) near infrared M 2 1 further requirements: highly efficient -> low power consumption (battery powered) portable, robust (including beam delivery) Riedo, A., et al. (2013). Coupling of LMS with a fs-laser ablation ion source: elemental and isotope composition measurements. Journal of Analytical Atomic Spectrometry, 28(8),

11 master oscillator fiber amplifier system (MOPA) generation of ultra-short pre-amplifier(s) lightpulses > mode-locked > doped single mode fibers fiber oscillator power-amplifier(s) Specialty optical fibers > Large Mode Area fibers > Photonic Crystal fibers (PCF) > low noise MHz>kHz mode-locking schemes > high gain > increased core-diameter > polarization additive-pulse - artificial saturable absorber - nonlinear polarization rotation > reach high peak power > frequency shifted feedback - artificial saturable absorber - interaction of AOM frequency shift, gain/loss, nonlinearities > graphene - real saturable absorber PCF fiber - graphene layers

12 pulse-energy literature overview mode-locking direct oscillator output 1 µj 100 nj 10 nj 1 nj 100 pj 10 pj 1 pj 100 fj Frequency shifted feedback laser: controlled Q-switched mode-locking Heidt, A. M. et al. (2007). Optics express, 15(24), Mode-locking type Polarization Additive-pulse triangles: additive pulse modelocking circles: Graphene graphene oxide modelocking rectangles: Frequency frequency shifted shifted feedback feedback laser Wavelength filled symbol: direct cavitiy output empty blue: symbol: 1 µm after pulse compressor red: 1.5 µm red: External 1 um temporal compression blue: 1.5 um Literature Polarization Additive-pulse > 17 publications > 1992-today Frequency shifted feedback > 7 publications > 1998-today Graphene > 6 publications > 2009-today 10 fj 1 fj 10 fs 100 fs 1 ps 10 ps 100 ps 1 ns 10 ns 100 ns 1 µs pulse-width FWHM

13 preliminary results frequency shifted feedback mode-locked fiberlaser > rep. rate 3.9 MHz > central wavelength nm > spectral FWHM 1 nm > output power 500 mw (E pulse 130 nj) > pulse duration FWHM 6ps > pulse duration compressed FWHM 800fs (estimated) next steps: all-in fiber version, controlled Q-switched modelocking

14 optical power [db] optical power [normed to to 1] 1] optical power [db] preliminary results Additive pulse-modelocking fiberlaser with self-optimization spectra oscilloscope traces optimizers: rep. rate 36.8 MHz spectral FWHM 6nm pulse FWHM 12ps pulse energy 63pJ residual pump signal wavelength [nm] spectral FWHM 0.6nm residual pump 960 signal wavelength [nm] time [ps] FWHM oscillator output tau_ac=17ps tau_gauss=12ps tau_sech 2 2 =11ps FWHM compressed pulse tau_ac=452fs tau_gauss=320fs tau_sech 2 =292fs next step: self-optimization towards controlled Q-switched mode-locking? 50 60

15 timeline fiberlaser development Months Service-LMS Lab-LMS Field-LMS 6 months 24 months > preliminary experiments > risk assessment > identification of most promising concept > know-how transfer > from prototype to a product by IONIGHT > development of ultra-short pulsed fiberlaser system > application, implementation tests

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