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Self-Mode-Locking Investigation of High-Power Optically Pumped Semiconductor Laser

NCTU Electrophysics. Self-Mode-Locking Investigation of High-Power Optically Pumped Semiconductor Laser. 高功率光激發式半導體雷射之自鎖模研究. Advisor: Yung Fu Chen Student: Yi Chun Lee Date: 2010/07/09. Solid-State Laser Physics Lab. NCTU Electrophysics. Outline. 1. Introduction

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Self-Mode-Locking Investigation of High-Power Optically Pumped Semiconductor Laser

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  1. NCTU Electrophysics Self-Mode-Locking Investigation of High-Power Optically Pumped Semiconductor Laser 高功率光激發式半導體雷射之自鎖模研究 Advisor: Yung Fu Chen Student: Yi Chun Lee Date: 2010/07/09 Solid-State Laser Physics Lab. Y.C. Lee

  2. NCTU Electrophysics Outline 1. Introduction 1.1 Background and Motivation 1.2 OPSL V.S DPSSL 1.3 OPSL Technology 2. OPSL Experimental Results 2.1 OPSL Parameter Optimized 2.2 Spontaneous Mode-Locking of OPSL 2.3 Theoretical Simulation 3. Summary and Future Work Y.C. Lee Solid-State Laser Physics Lab.

  3. Flashlamp Pumped Double Frequency Nd:YAG Laser ~532nm NCTU Electrophysics 閉角型青光眼之小梁成型術 視網膜剝離、眼底止血 • Diode Pumped Double Frequency Nd:YVO4 Laser ~532nm • Diode Pumped Double Frequency Nd:YAG Laser ~561nm • Optical Pumped Semiconductor Laser ~577nm • Diode Laser ~810nm 青光眼治療、眼底光凝結手術 眼底黃斑部病變 白內障手術 • Flashlamp Pumped Nd:YAG Laser ~1064nm Y.C. Lee Solid-State Laser Physics Lab.

  4. NCTU Electrophysics Optically Pumped Semiconductor Laser • Applications for OPSL • Medical Field • Life Science and Research • Forensics • Graphic Arts and Display Y.C. Lee Solid-State Laser Physics Lab.

  5. NCTU Electrophysics 60fs Y.C. Lee Solid-State Laser Physics Lab.

  6. Flash lamp pumped passively Q-switched Nd:YAG laser 2 ns/div NCTU Electrophysics Strange Phenomenon in Time Domain Reflector Flash Lamp Output Coupler Cr4+ Crystal Polarizer 1064 nm Nd:YAG Rod Reflector Mirror Reflector Y.C. Lee Solid-State Laser Physics Lab.

  7. Diode pumped passively Q-switched Yb-doped fiber laser 10 ns/div NCTU Electrophysics Strange Phenomenon in Time Domain Fiber-coupled LD @976 nm cavity Yb doped double-clad fiber PM; clad/core: Dia. 250/30 μm (3m) NA >0.46 /<0.06 HT@976 nm HR@1030~1100 nm FP filter 3x50 QWs R~4% HR @ 1030~1100 nm Laser output Y.C. Lee Solid-State Laser Physics Lab.

  8. Cw-pumped diffusion-bonded Nd:YVO4 laser 2 ns/div 100 ns/div 1 ns/div Cavity length：19 cm Cavity length：45 cm NCTU Electrophysics Strange Phenomenon in Time Domain Diode Pumped Diffusion-Bonded Nd:YVO4 Laser 808nm Laser Diode Output Coupler Nd:YVO4 Crystal 1064nm Coupling Lens Y.C. Lee Solid-State Laser Physics Lab.

  9. Fiber coupled LD Output coupler 200 ps/div NCTU Electrophysics Self-Mode-Locked Nd:YVO4 Laser Stable CW mode locking and short pulse width Y.C. Lee Solid-State Laser Physics Lab.

  10. NCTU Electrophysics Introduction OPSL V.S DPSSL DPSSL – Diode Pumped Solid State Laser 二極體激發式固態雷射 OPSL – Optically Pumped Semiconductor Laser 光激發式半導體雷射 • In 1980s, the progress in the growth technology of semiconductor heterostructures developed the high-power diode laser pumped with a solid gain medium is so called diode-pumped solid-state (DPSS) lasers. • In 1997, M. Kuznetsov, F.Hakimi and A. Mooradian demonstrated the first optically-pumped semiconductor laser (OPSL). Y.C. Lee Solid-State Laser Physics Lab.

  11. NCTU Electrophysics Introduction OPSL V.S DPSSL • The Mechanism of Stimulated Emission • - Four-Level System in Solid-State Laser and • Semiconductor Laser △Ec Eg Eg well barrier △Ev Y.C. Lee Solid-State Laser Physics Lab.

  12. NCTU Electrophysics Introduction OPSL V.S DPSSL DPSSL V.S OPSL Diode Pumped Solid State Laser Optically Pumped Semiconductor Laser Y.C. Lee Solid-State Laser Physics Lab.

  13. NCTU Electrophysics Introduction OPSL Technology • Semiconductor as Gain Medium - Substrate - Quantum Well - Bragg Mirror Y.C. Lee Solid-State Laser Physics Lab.

  14. NCTU Electrophysics Introduction OPSL Technology • GaAs substrate based AlGaAs (800-870nm) InGaAs (870-1150nm) GaInNAs (1.1-1.5μm) • InP substrate based Wavelength＞1.3μm Y.C. Lee Solid-State Laser Physics Lab.

  15. 30 periods ….. ….. x NCTU Electrophysics Introduction OPSL Technology • The Length of Quantum Well would be designed as 1/2 laser wavelength • Laser Wavelength would slightly shifted according to quantum well design. Active region Cap layer Substrate Y.C. Lee Solid-State Laser Physics Lab.

  16. NCTU Electrophysics Outline 1. Introduction 1.1 Background and Motivation 1.2 OPSL V.S DPSSL 1.3 OPSL Technology 2. OPSL Experimental Results 2.1 OPSL Parameter Optimized 2.2 Spontaneous Mode-Locking of OPSL 2.3 Theoretical Simulation 3. Summary and Future Work Y.C. Lee Solid-State Laser Physics Lab.

  17. NCTU Electrophysics OPSL Experimental Results OPSL Optimized Pumping Source Semiconductor Gain Medium Cavity Length 1060 nm Y.C. Lee Solid-State Laser Physics Lab.

  18. NCTU Electrophysics OPSL Experimental Results OPSL Optimized • OPSL Optimized by using • Different Radius of Output Coupler • Cavity Length Semiconductor Gain Medium High speed photo-detector Output Coupler Laser Diode 1060 nm Focusing lens Y.C. Lee Solid-State Laser Physics Lab.

  19. NCTU Electrophysics OPSL Experimental Results OPSL Optimized • Different Radius of OC and Cavity Length. ROC = 250mm Cavity Length = 25mm, Max Power ~7.8W Cavity Length = 50mm, Max Power ~8.0W Cavity Length = 100mm, Max Power ~ 7.8W ROC = 50mm Cavity Length = 30mm, Max Power ~7.4W Cavity Length ~ 50mm, Max Power ~7.03W ROC = 250mm Cavity Length = 50mm, Max Power ~8.0W ROC = 2000mm Cavity Length = 25mm, Max Power ~6.8W Cavity Length = 50mm, Max Power ~6.7W Solid-State Laser Physics Lab.

  20. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL Digital oscilloscope Semiconductor Gain Medium Output Coupler High speed photo-detector Laser Diode 1060 nm Focusing lens Power Optimized Mode-Lock Optimized 5ns/div 5ns/div

  21. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length ~ 250mm

  22. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length ~ 250mm 5ns/div Mode-Lock Optimized Power Optimized 5ns/div Y.C. Lee Solid-State Laser Physics Lab.

  23. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length = 187mm

  24. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length = 187mm 5ns/div Mode-Lock Optimized Power Optimized 5ns/div Y.C. Lee Solid-State Laser Physics Lab.

  25. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length = 125mm

  26. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length = 125mm Mode-Lock Optimized Power Optimized 2ns/div 2ns/div Y.C. Lee Solid-State Laser Physics Lab.

  27. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length = 86mm

  28. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length = 86mm Mode-Lock Optimized Power Optimized 2ns/div 2ns/div Y.C. Lee Solid-State Laser Physics Lab.

  29. NCTU Electrophysics OPSL Experimental Results Power Optimized Spontaneous Mode-Locking of OPSL ROC = 250mm Cavity Length = 125mm Mode-Lock Optimized 2ns/div 2ns/div 2ns/div Fundamental Mode Solid-State Laser Physics Lab.

  30. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL • Scan the Beating to determine the distribution of high-order mode. Digital oscilloscope Semiconductor Gain Medium High speed photo-detector Output Coupler Laser Diode 1060 nm Focusing lens Y.C. Lee Solid-State Laser Physics Lab.

  31. 8 2ns/div 1 2ns/div 8 2ns/div 4 9 2 1 3 4 5 7 6 2ns/div 7 2ns/div 3 10 11 6 11 2ns/div 2ns/div Y.C. Lee

  32. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL Spectral power density (dBm) -35 Transverse Frequency -45 -55 Longitudinal Frequency -65 -75 1.6 3.2 4.8. 6.4. 8.0. Frequency (GHz) Y.C. Lee Solid-State Laser Physics Lab.

  33. NCTU Electrophysics OPSL Experimental Results Spontaneous Mode-Locking of OPSL Fundamental Mode Detected Point 8 4 3 7 6 1 11 High-Order Mode High-Order Mode Y.C. Lee Solid-State Laser Physics Lab.

  34. NCTU Electrophysics OPSL Experimental Results Theoretical Simulation q 0 表示縱向模態的指標， lcav代表有效的共振腔長，R 為曲率半徑。 Y.C. Lee Solid-State Laser Physics Lab.

  35. NCTU Electrophysics OPSL Experimental Results Theoretical Simulation Y.C. Lee Solid-State Laser Physics Lab.

  36. NCTU Electrophysics OPSL Experimental Results Theoretical Simulation Y.C. Lee Solid-State Laser Physics Lab.

  37. NCTU Electrophysics 1 2ns/div Experimental Results Theoretical Simulation 2 1 2ns/div 2ns/div 2 2ns/div 2ns/div 3 3 2ns/div Y.C. Lee Solid-State Laser Physics Lab.

  38. 6 2ns/div NCTU Electrophysics 4 2ns/div 2ns/div 4 5 2ns/div 5 2ns/div 2ns/div 7 7 2ns/div 6 2ns/div Y.C. Lee Solid-State Laser Physics Lab.

  39. 8 2ns/div NCTU Electrophysics 10 9 2ns/div 2ns/div 2ns/div 9 8 2ns/div 2ns/div 10 11 11 2ns/div 2ns/div Y.C. Lee Solid-State Laser Physics Lab.

  40. 8 2ns/div 1 2ns/div 4 2ns/div 8 2ns/div 4 9 2 1 3 4 5 7 6 2ns/div 1 2ns/div 7 2ns/div 7 2ns/div 3 10 3 2ns/div 11 6 6 2ns/div 11 2ns/div 11 8 2ns/div 2ns/div 2ns/div Y.C. Lee

  41. NCTU Electrophysics Outline 1. Introduction 1.1 Background and Motivation 1.2 OPSL V.S DPSSL 1.3 OPSL Technology 2. OPSL Experimental Results 2.1 OPSL Parameter Optimized 2.2 Spontaneous Mode-Locking of OPSL 2.3 Theoretical Simulation 3. Summary and Future Work Y.C. Lee Solid-State Laser Physics Lab.

  42. NCTU Electrophysics Summary and Future Work Summary • OPSLalso discovered the spontaneous mode-locking phenomenon. • The beating of the mode-locking output pulse trains are observed of transverse modes coupling. • Theoretical simulation is matched to experimental results. 5ns/div 5ns/div Y.C. Lee Solid-State Laser Physics Lab.

  43. NCTU Electrophysics Summary and Future Work Future Work 0/1 1/1 1/2 1/3 2/3 1/4 2/5 3/5 3/4 1/5 2/7 3/8 3/7 4/7 5/8 5/7 4/6 Farey Tree 1/6 2/9 3/11 3/10 4/11 5/13 5/12 4/9 Y.C. Lee Solid-State Laser Physics Lab.

  44. NCTU Electrophysics Summary and Future Work Future Work 1:3 Y.C. Lee Solid-State Laser Physics Lab.

  45. NCTU Electrophysics Summary and Future Work Future Work 2ns/div 1:4 Y.C. Lee Solid-State Laser Physics Lab.

  46. NCTU Electrophysics Summary and Future Work Future Work 2:5 Y.C. Lee Solid-State Laser Physics Lab.

  47. NCTU Electrophysics Summary and Future Work Future Work 5:12 Y.C. Lee Solid-State Laser Physics Lab.

  48. NCTU Electrophysics Summary and Future Work Future Work 5ns/div 7:17 12:29 Y.C. Lee Solid-State Laser Physics Lab.

  49. NCTU Electrophysics Summary and Future Work Future Work Digital oscilloscope Semiconductor Gain Medium Output Coupler High speed photo-detector Laser Diode 1060 nm SESAM Focusing lens Y.C. Lee Solid-State Laser Physics Lab.

  50. NCTU Electrophysics Thanks for your attention! Y.C. Lee Solid-State Laser Physics Lab.

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