Presentation on theme: "Laser & Fiber Electronics Group"— Presentation transcript:
1Laser & Fiber Electronics Group Institute of Telecommunications, Teleinformatics and Acoustics Wrocław University of Technology
2Group members Head: Professor Krzysztof M. Abramski Staff: Dr. Arkadiusz AntończakDr. Paweł KaczmarekDr. Adam WążDr. Grzegorz DudzikDr. Michał Nikodem (on leave to Princeton University, Department Of Electronics)PhD students:Jarosław SotorMaciej NowakGrzegorz SobońPaweł KoziołKarol KrzempekRafał 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
3Fiber lasers and amplifiers: Our researchFiber lasers and amplifiers:MOPA systemsOptical frequency combsSolid state diode pumped single frequency microchip lasersLaser micromachiningLaser-fiber vibrometry
42-stage All-Fiber MOPA setup Experimental setupOutput signals (SNR > 50 dB)~37 dB gain nm4.8 W output power (ŋ = 24%)Features:Dual-stage all-in-fiber MOPA system4.8 W output power (CW mode)1550 nm eye-safe regionSignle-frequency tunable (1540 – 1570 nm)potential source for nonlinear frequency conversion, Tm3+ laser and amplifier pumpingP. 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)
5Self-made additional equipment Water-coolerLaser Diode Temperature ControllerCooling blocks for 3*10W diodesHigh Power Laser Diode Temperature Controller
62-stage MOPA – pulsed regime Pulse-shaping effect8 ns output pulsePeak power vs. Repetition ratePulse distortionFeatures:8 ns pulsestunable repetition rate (> 10 kHz)Pulse-shaping system (pulse distortion pre-compensation)100 ns flat-top pulses with high energypotential source for military, LIDAR, free-space telecom, etc.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
73-stage Fiber-MOPA system Features:All-in-fiber designLarge Mode Area (LMA) Erbium-Ytterbium fiber used (25 μm core diameter)6 * 35W pumping power (915 nm)High output power expected (~20W)35W diodesPump injection systemLMA FiberTapered spliceCladding mode-stripper
8169 MHz repetition rate, passively mode locked fiber laser Features:nonlinear polarization rotation operation principal169 MHz fundamental repetition rate1,2m of cavity length (30cm of Er3+ fiber)111 fs pulses30 mW of average output power1550nm 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).
9Optical frequency comb stabilization Long-term frequency fluctuations less than 0,93 MHzMichał Nikodem, Krzysztof Abramski, „Controlling the frequency of the Frequency Shifted Feedback fiber laser using injection-seeding technique,” Optics Communications 283 (2010), ppMichał Nikodem, Ewelina Kluzniak, Krzysztof Abramski, „Wavelength tunability and pulse duration control in frequency shifted feedback Er-doped fiber lasers,” Optics Express 17, (2009).
10Single frequency Nd:YAG/KTP laser where:Δn = 0,0844 – is the natural birefringence of KTP (nz - ny), l2 – geometrical length of KTPAntończak 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
11Single frequency Nd:YAG/KTP laser single frequency / TEM00 mode operation,output power (at pumping power: P808 = 1W): > 532nm ~ 1064nmfrequency tune: ∆ν0 ~110GHzAntończak 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
13Microchip laser stabilized by fiber Bragg grating Δλm = 0,35pm/oC => (93MHz/oC)frequency stability at the level of 10-7,simple frequency stabilization of the laser for metrological purposes.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.
14Fast Frequency Control of Microchip Lasers fm = 1kHzfm = 5kHzfm = 10kHzfm = 50kHzfm = 100kHzfm = 500kHzfm = 800kHzfm = 1,5MHzSensitivity X: 5MHz/div, Y: 10dB/div, Ref: -20dBm, UEOM = 10 VppAntończak 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,
15Single frequency green (532nm) laser with YVO4 beam displacer - conception Crystals cutting and single frequency laser configuration with YVO4 beam displacerFeatures:birefringent filter formed by YVO4 beam displacer and KTP crystal,possibility of monolithic realization,resistant to environmental hazards.J.Z. Sotor, A.J. Antończak, K.M. Abramski, “Single-longitudinal mode Nd:YVO4/YVO4/KTP green solid state laser,”Opto−Electronics Review 18(1), 75–79,(2010),J.Z. Sotor, A.J. Antończak, K.M. Abramski, „Single frequency, monolithic solid state laser”, Patent application, P383937,
16Monolithic 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)Practical realization of single frequency DPSS laserExperimental set-up of single frequency DPSS laserJ.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).
17Monolithic single frequency laser – parameters a) b) c)d)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 1.2J.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
18EMF electrooptical sensor based on microchip lasers Spectral analysis in the case of the electric field measurement E = 80V/m and the frequency FRF = 5MHz (X: 20MHz/div)Electric field sensor calibration in TEM lineAntończak 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, pp18
19Laser micromachining Semiconductors: Si (silicon), Ge (germanium), GaAs (g allium arsenide), InP (indium phosphide),Ceramics and glass:Al2O3 (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,
20Examples of laser micromachining 150μm diameter, siliconLaser microdrilling60μm x 60μm square hole in a silicon chip with a thickness of 350μm,micro-holes in fuel injection systemsdiamond cutting0.4 mm thick sapphiretungsten slit 0.01mm thick 0.1mmLaser microcutting
21Examples of laser micromachining aluminum block with a group of squares separated 500μm 100μm gapLaser micromillingstructure 2,5Dstructure 3Dstructure 3D diameter 1,4mmmicro-antenna applications50μm holes in the packaging of biomedicalmicrovia through PCBmicrolenses (polymer)Other:
22Repetition Frequency [kHz] Laser color markingRed / raspberry colorBlueGreenYellow/ goldColorPower [W]Speed [mm/s]Hatching [mm]Repetition Frequency [kHz]RED (light)8500,03100RED (dark)100,04GREEN (light)0,0590GREEN (dark)0,01BLUE (light)BLUE (dark)12150GOLD (light)15250GOLD (dark)200BROWN1425SILVERPURPLE (light)90,02PURPLE (dark)NAVY (blue)0.01
23Resolution tested up to 5 mils (~120μm) Fast prototyping of PCB (Printed Circuit Board) using laser micromachining- without preparation of photographic filmFor different substrates:a) FR-2 b) CEM-1; c) FR-4Resolution tested up to 5 mils (~120μm)Technology useful for: circuit boards, RFID, micro-strip antennas, etc.
24Idea 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
254 – 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), 2009A. Waz, P. Kaczmarek, M. Nikodem and K. M. Abramski WDM optocommunication technology used for multipoint vibrometry Proc. SPIE 7098, 2008
29Green 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 (PLASER_= 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
30Laser & Fiber Electronics Group Thank you for your attention!