Transcription of Nd : YAG Laser
1 Prof. DickmannNd : YAG LaserDidactic CounsellorFachhochschuleM nsterFachbereichPhysikal. TechnikABCDEFGHOSTIMECH1CH2 GAINKTEMPERATURECURRENTMODULATOR 01 MFREQUENCYAMPLITUDEOFFSETPOWERTIMECH1CH2 GAINTEMPERATURECURRENTMODULATOR (kV)ONOFFABCDEHSTEMPERATURECURRENTMODULA TOR TransferDiodelaser Pumped1 THE ND YAG- Laser 4 Optical pumping 4 Four-level system of the Nd-YAG Laser . 6 Rate equation model for four levels 6 Solution of the rate equations 7 Steady-state solution 7
2 Time-varying solution of the rate equations 8 Spiking 8 Q-switching 9 2 Laser RESONATOR 10 Types of resonators 10 Stability criterion 11 Resonator modes 11
3 Longitudinal modes 11 Gain profile 12 Transverse modes 12 3 THE PUMP-LIGHT SOURCE 13 Diode Laser 13 4 SECOND HARMONIC GENERATION 15 Introduction 15 Interaction of light and matter
4 16 Non-linear Optics 16 Frequency doubling 17 Phase matching 17 5 Q-SWITCH 20 Mechanical Q-switch 20 Optical Q-switcher 20 Passive Q-switch
5 21 Pockel s cell 22 6 SET-UP AND PERFORMANCE OF THE ND:YAG- Laser 25 The Modules 25 Experimental set-up for characterising the laserdiode 27 absorption spectrum 28 Wavelength and temperature dependence 28
6 Laser diode output power 29 The 4F3/2 life-time measurement 30 The Nd-YAG Laser set-up 31 Laser operation 31 Measurement of threshold and output power of the Nd-YAG Laser 31 Output power at various pump wavelengths 32 Display of transverse modes 32 Demonstration of Spiking 32
7 Operation of the m Line 33 Mode Aperture and TEM00 Operation 33 7 SECOND HARMONIC GENERATION 34 Modules and Set-Up 34 Dynamic measurements 35 8 PASSIVE Q-SWITCH 36 Modules and Set-Up 36 9 ACTIVE Q-SWITCH 37
8 Modules and Set-Up 37 Intra-cavity second harmonic generation with Q-switched Laser 39 Extra-cavity second harmonic generation with Q-switched Laser 40 10 Laser SAFETY 41 11 THE LASERDIODE CONTROLLER LDC01 42 Experiment 05 / 07 / 08 Diode Pumped Nd:YAG- Laser Page - 4 - Dr.
9 W. Luhs MEOS GmbH 79427 Eschbach Jan. 1999/July 2003 1 The Nd YAG- Laser Optical pumping Optical pumping is a process in which light is radiated into a specimen under investigation and the effect of the light on the specimen is exami
