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Laser & Fiber Electronics Group Institute of Telecommunications, Teleinformatics and Acoustics Wrocław University of Technology.

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Presentation on theme: "Laser & Fiber Electronics Group Institute of Telecommunications, Teleinformatics and Acoustics Wrocław University of Technology."— Presentation transcript:

1 Laser & Fiber Electronics Group Institute of Telecommunications, Teleinformatics and Acoustics Wrocław University of Technology

2 Group members Head: Professor Krzysztof M. Abramski Staff: Dr. Arkadiusz Antończak Dr. Paweł Kaczmarek Dr. Adam Wąż Dr. Grzegorz Dudzik Dr. Michał Nikodem (on leave to Princeton University, Department Of Electronics) PhD students: Jarosław Sotor Maciej Nowak Grzegorz Soboń Paweł Kozioł Karol Krzempek Rafał Lewicki (on leave to Rice University, Laser Science Group) Natalia Trela (on leave to Heriott-Watt University, Laser and Photonics Applications Group) 12 MSc students

3 Our research 1.Fiber lasers and amplifiers: MOPA systems Optical frequency combs 2.Solid state diode pumped single frequency microchip lasers 3.Laser micromachining 4.Laser-fiber vibrometry

4 2-stage All-Fiber MOPA setup P. Kaczmarek, G. Soboń, A. Antończak, J. Sotor, K.M. Abramski, Fiber-MOPA sources of coherent radiation, Bulletin of The Polish Academy of Sciences, Vol. 56, Issue 4 (2010) ~37 dB gain nm 4.8 W output power (ŋ = 24%) Output signals (SNR > 50 dB) Experimental setup Features: Dual-stage all-in-fiber MOPA system 4.8 W output power (CW mode) 1550 nm eye-safe region Signle-frequency tunable (1540 – 1570 nm) potential source for nonlinear frequency conversion, Tm 3+ laser and amplifier pumping

5 Self-made additional equipment Water-cooler Laser Diode Temperature Controller Cooling blocks for 3*10W diodes High Power Laser Diode Temperature Controller

6 2-stage MOPA – pulsed regime Pulse-shaping effect G. Sobon, P. Kaczmarek, A. Antonczak, J. Sotor, A. Waz, K.M. Abramski, Pulsed Fiber-MOPA source operating at 1550 nm with pulse distortion pre-compensation, Optical Fiber Communication Conference and Exposition OFC 2011 paper- in review Pulse distortion 8 ns output pulse Peak power vs. Repetition rate Features: 8 ns pulses tunable repetition rate (> 10 kHz) Pulse-shaping system (pulse distortion pre-compensation) 100 ns flat-top pulses with high energy potential source for military, LIDAR, free-space telecom, etc.

7 3-stage Fiber-MOPA system 35W diodes Pump injection system LMA FiberTapered splice Features: All-in-fiber design Large Mode Area (LMA) Erbium-Ytterbium fiber used (25 μm core diameter) 6 * 35W pumping power (915 nm) High output power expected (~20W) Cladding mode-stripper

8 169 MHz repetition rate, passively mode locked fiber laser Features: nonlinear polarization rotation operation principal 169 MHz fundamental repetition rate 1,2m of cavity length (30cm of Er 3 + fiber) 111 fs pulses 30 mW of average output power 1550nm working wavelength (Eye-safe region) Michał Nikodem, Krzysztof Abramski, 169 MHz repetition frequency all-fiber passively mode-locked Erbium doped fiber laser, Optics Communications 283, (2010). Michał Nikodem, Grazyna Tomczyk, Aleksander Budnicki, Krzysztof Abramski, Investigation of passively mode-locked erbium doped fiber ring laser due to nonlinear polarization rotation, Opto-electronics Review, Vol. 16, No.2, (2008).

9 Optical frequency comb stabilization Michał Nikodem, Krzysztof Abramski, Controlling the frequency of the Frequency Shifted Feedback fiber laser using injection-seeding technique, Optics Communications 283 (2010), pp Michał Nikodem, Ewelina Kluzniak, Krzysztof Abramski, Wavelength tunability and pulse duration control in frequency shifted feedback Er-doped fiber lasers, Optics Express 17, (2009). Long-term frequency fluctuations less than 0,93 MHz

10 Single frequency Nd:YAG/KTP laser where: Δn = 0,0844 – is the natural birefringence of KTP (n z - n y ), l 2 – geometrical length of KTP Antończak Arkadiusz, Sotor Jarosław, Abramski Krzysztof: Single frequency green laser with birefringent filter. W: Proceedings of th International Conference on Transparent Optical Networks with 5th European Symposium on Photonic Crystals.., Nottingham, UK, June 18-22, Vol. 4 / [Ed. M. Marciniak]. Piscataway, NJ : IEEE, cop pp

11 Single frequency Nd:YAG/KTP laser single frequency / TEM 00 mode operation, output power (at pumping power: P 808 = 1W): > 532nm ~ 1064nm 110GHz frequency tune: ν 0 ~ Antończak Arkadiusz, Sotor Jarosław, Abramski Krzysztof: Single frequency microchip solid state diode pumped lasers. Bulletin of the Polish Academy of Sciences. Technical Sciences. 2008, vol. 56, nr 2, s

12 Nd:YAG/BIBO – 473nm for underwater vibrometry output 808 = 1W ~ 473nm good beam quality - TEM 00 Antończak Arkadiusz, Sotor Jarosław, Matysiak Mateusz, Abramski Krzysztof: Blue 473-nm solid state diode pumped Nd: YAG/BiB0 microchip laser. Opto-Electronics Review, 2010, vol. 18, nr 1, pp ,

13 Microchip laser stabilized by fiber Bragg grating frequency stability at the level of 10 -7, simple frequency stabilization of the laser for metrological purposes. Δλ m = 0,35pm/ o C => (93MHz/ o C) Antończak Arkadiusz, Sotor Jarosław, Abramski Krzysztof: Single frequency solid state laser stabilized by FBG. W: Proceedings of th Anniversary International Conference on Transparent Optical Networks with 7th European Symposium on Photonic Crystals, Athens, Greece, June 22-26, 2008.

14 Fast Frequency Control of Microchip Lasers f m = 1kHz f m = 5kHzf m = 10kHzf m = 50kHz f m = 100kHzf m = 500kHzf m = 800kHzf m = 1,5MHz Sensitivity X: 5MHz/div, Y: 10dB/div, Ref: -20dBm, U EOM = 10 V pp Antończak Arkadiusz, Abramski Krzysztof: Frequency control of microchip lasers. W: Joint Conference of the German Society of Applied Optics (DGaO) and the Section of Optics of the Polish Physical Society. 106th Conference of the DGaO, Wrocław, May, 2005, Deutsche Gesallschaft fur Angewandte Optik,

15 Single frequency green (532nm) laser with YVO 4 beam displacer - conception Crystals cutting and single frequency laser configuration with YVO 4 beam displacer J.Z. Sotor, A.J. Antończak, K.M. Abramski, Single-longitudinal mode Nd:YVO4/YVO4/KTP green solid state laser, OptoElectronics Review 18(1), 75–79,(2010), J.Z. Sotor, A.J. Antończak, K.M. Abramski, Single frequency, monolithic solid state laser, Patent application, P383937, Features: birefringent filter formed by YVO 4 beam displacer and KTP crystal, possibility of monolithic realization, resistant to environmental hazards.

16 Monolithic single frequency laser Designed and manufactured monolithic laser resonator consist of three crystals bonded together with UV adhesive. Total resonator dimension: 2x2x10.5mm, 1x1x10.5mm (extended single frequency operation range) J.Z. Sotor, G. Dudzik, A.J. Antończak, K.M. Abramski, Single-longitudinal mode, monolithic, green solid-state laser, Applied Physics B, (2010), revised and accepted, J.Z. Sotor, A.J. Antończak, K.M. Abramski, Single frequency, monolithic green DPSS laser, Photonics West 2010, SPIE, Vol. 7578, 75782J (2010). Practical realization of single frequency DPSS laser Experimental set-up of single frequency DPSS laser

17 Monolithic single frequency laser – parameters Features: single frequency operation temperature range with mode hopping (Fig.a), output up to 160mW (Fig.b), output power stability ±0.75% (Fig.c), long term frequency stability 3·10 -8 (Fig.d), Gaussian beam profile with M2 at the level of 1.2 a) b) c) d) J.Z. Sotor, A.J. Antończak, K.M. Abramski, Single-longitudinal mode miniature, green solid state laser, Europhoton 2010, Hamburg 29.08– J.Z. Sotor, A.J. Antończak, K.M. Abramski, Single frequency monolithic solid state green laser as a potential source for vibrometry systems, 9th Int. Confercnceo n Vibration Measarcments laser and Noncontact Techniques, Ancona 2010

18 EMF electrooptical sensor based on microchip lasers Spectral analysis in the case of the electric field measurement E = 80V/m and the frequency F RF = 5MHz (X: 20MHz/div) Electric field sensor calibration in TEM line Antończak Arkadiusz, Abramski Krzysztof: Microchip laser antenna, Proceedings of th International Conference on Transparent Optical Networks with 4th European Symposium on Photonic Crystals, Barcelona, Spain, July 3-7, vol. 2 Piscataway, IEEE, pp

19 Laser micromachining Semiconductors: Si (silicon), Ge (germanium), GaAs (g allium arsenide), InP (indium phosphide), Ceramics and glass: Al 2 O 3 (alumina), AlN (aluminum nitride), LTCC ceramics, fused silica, BK7, etc. Metals and alloys: Titanium, tungsten, molybdenum, tantalum, indium, stainless steel, copper, aluminum, Plastics and Polymers: Poly-methyl methacrylate (PMMA), Teflon (PTFE), polyamide,

20 Examples of laser micromachining 150μm diameter, silicon Laser microdrilling 60μm x 60μm square hole in a silicon chip with a thickness of 350μm, micro-holes in fuel injection systems diamond cutting0.4 mm thick sapphiretungsten slit 0.01mm thick 0.1mm Laser microcutting

21 Examples of laser micromachining aluminum block with a group of squares separated 500μm 100μm gap Laser micromilling structure 2,5Dstructure 3D structure 3D diameter 1,4mm micro-antenna applications 50μm holes in the packaging of biomedical microvia through PCBmicrolenses (polymer) Other:

22 Laser color marking ColorPower [W] Speed [mm/s] Hatching [mm] Repetition Frequency [kHz] RED (light)8500,03100 RED (dark)10500,04100 GREEN (light)8500,0590 GREEN (dark)101000,01100 BLUE (light)101000,05100 BLUE (dark)121500,05100 GOLD (light)152500,05100 GOLD (dark)122000,05100 BROWN14250,05100 SILVER102500,05100 PURPLE (light)91000,02100 PURPLE (dark)121000,04100 NAVY (blue) Red / raspberry color Blue Green Yellow/ gold

23 Fast prototyping of PCB (Printed Circuit Board) using laser micromachining For different substrates: a) FR-2 b) CEM-1; c) FR-4 Resolution tested up to 5 mils (~120μm) Technology useful for: circuit boards, RFID, micro-strip antennas, etc. - without preparation of photographic film

24 Idea of single channel laser – fiber vibrometer P. R. Kaczmarek, M. Kazimierski,A. Waz and K. M. Abramski Laser-Fiber Vibrometry/Velocimetry Using Telecommunications Devices Proc. SPIE 5503, pp , 2004

25 4 – Channel Fiber-Laser Vibrometer A. T. Waz, P. R. Kaczmarek and K. M. Abramski Laser-fibre vibrometry at 1550 nm, Meas. Science and Technology vol (8pp), 2009 A. Waz, P. Kaczmarek, M. Nikodem and K. M. Abramski WDM optocommunication technology used for multipoint vibrometry Proc. SPIE 7098, 2008

26 Vibrometry signal processing

27 Data acquisition software

28 4 – Channel Fiber-Laser Vibrometer

29 Green laser vibrometry based on single frequency microchip laser S/N ratio versus laser output power (L = 0.25m) S/N ratio versus distance to the moving object (P LASER_ = 10.5mW) Arkadiusz J. Antończak, Paweł Kozioł, Jarosław Z. Sotor, Paweł R. Kaczmarek, Adam T. Wąż, Krzysztof M. Abramski, Elementary experiments in green laser vibrometry, 9th International Conference on Vibration Measurements by Laser and Noncontact Techniques, Advances and Applications, Ancona, June 2010 / Ed. Enrico Primo Tomasini. Bellingham, Wash.: SPIE

30 Laser & Fiber Electronics Group Thank you for your attention!


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