1. High Power LD, LDA & LDS Speaker: Shiuan-Li Lin Advisor : Sheng-Lung Huang Solid-State Laser Crystal and Device Laboratory

2. Page 2 Outline  Semiconductor laser diode  The working principle of laser diode  High power laser diode (LD)  High power laser diode array (LDA)  High power laser diode stack (LDS)  Conclusion Solid-State Laser Crystal and Device Laboratory

3. Page 3 Semiconductor Laser Diode Solid-State Laser Crystal and Device Laboratory  Laser diode is a laser whose active medium is a semiconductor similar light-emitting diode, which is formed from a p-n junction and powered by injected electric current  Laser diodes are numerically the most common laser type and have many applications like laser printer, laser pointer, optical communication etc.

4. Page 4 The working principle of laser diode Solid-State Laser Crystal and Device Laboratory  Carrier generation and recombination in active regions  Recombined carriers contribute to gain & photon emission

5. Page 5 The working principle of laser diode Solid-State Laser Crystal and Device Laboratory  Double heterostructure lasers Enhance most of the electron-hole pairs can contribute to amplification  Quantum well lasers Enable laser action at relatively long wavelengths & be tuned  VCSEL The optical cavity axis along the direction of current flow

6. Page 6 The working principle of laser diode Solid-State Laser Crystal and Device Laboratory  Material systems : laser diode can achieve a wide range of emission wavelength

7. Page 7 High power laser diode Solid-State Laser Crystal and Device Laboratory

8. Page 8 High power laser diode : narrow band Solid-State Laser Crystal and Device Laboratory  RW laser 1. many Fabry-Perot modes exist 2. mutlimode  DFB/DBR laser 1. integrated grating structure acting as frequency filter 2. purely singlemode

9. Page 9 High power laser diode : narrow band Solid-State Laser Crystal and Device Laboratory  Volume Bragg Grating (VBG) using the grating design to select the selected wavelength passing through

10. Page 10 State of the art : single emitter of LD Solid-State Laser Crystal and Device Laboratory  Coherent : 790-830 nm Single Emitter Devices

11. Page 11 High power laser diode : LDA Solid-State Laser Crystal and Device Laboratory CCP

12. Page 12 State of the art : single emitter of LDA Solid-State Laser Crystal and Device Laboratory  Coherent : 780-830 nm CCP

13. Page 13 State of the art : single emitter of LDA Solid-State Laser Crystal and Device Laboratory  Coherent : PulseLife CW Horizontal Array

14. Page 14 High power laser diode : LDS Solid-State Laser Crystal and Device Laboratory  Laser diode stacks output power usually around 40W to 4500W, depend on the arrays or emitters‘ number  LDS has many kinds of shape like G-stacks, diode laser bars or etc.

15. Page 15 State of the art : single emitter of LDA Solid-State Laser Crystal and Device Laboratory  JENOPDIK : Vertical Diode Laser Stacks

16. Page 16 Conclution Solid-State Laser Crystal and Device Laboratory  Semiconductor laser diode are numerically the most common laser type, with 2004 sales of approximately 733 million units  High power laser diode has many application like laser cutting industry, optical pumping etc.

17. Page 17 Solid-State Laser Crystal and Device Laboratory bee6565 Thanks for your listening!