Parameters, the laser is tuned to the 85 Rb and 87 Rb D 2 By patiently and systematically adjusting each one of these tuning Varying the temperature of, and the injection current through the diode Modulating the external cavity length through the use of a pulsating PZTĪttached to the rear of the grating. The laser frequency is accordingly scanned by The diode, making it possible to both tune and stabilize the laser at a The grating, selected frequencies may be sent back into the lasing cavity of The external cavity is aįabry-Perot resonator whose reflecting facets include the rear facet of theĭiode chip and a diffraction grating. The hyperfine energy states of atomic transitions. This feedback significantly narrows the naturalīandwidth of the free running laser and thereby makes it possible to probe Then "flashed" in order to ensure that the laser is in fact receivingĮxternal feedback. Solely in locking the output of a diode laser, but also concentrates on the Signals Time Constant Calibrating the Error Signal on the Lock-in References Acknowledgements Uncertainty in Locking Frequency Uncertainty in Reference Frequency Formulaic Summary Adjusting the Gain of the Hysterisis Unwanted Optical Feedback Producing an Absorption Spectrum Photodiodes Frequency Scanning Calibrating the FrequencyĪxis PZT Doppler Broadened Peaks Ground States Maxwell-Boltzman Velocity Distribution Saturation Spectroscopy Transition Bandwidth Reduced Beam Layout Doppler-Free Peaks Revealed Some Tricks Cross-over Peaks Broadening Mechanisms Doppler, Natural and Pressure Broadening Power Broadening Saturation Parameter Neutral Density Filters Frequency Locking withĪ Lock-In Amplifier Frequency Drift Reference Frequency Feedback Feedback Circuit Dither Signal Signal Processing by the Lock-In Error Signal
Spatial Orientation of Beam Extended Cavity Geometry Optical Circuit Temperature Control Temperature Feedback Temp. Parameters Bandgap of lasing chip Response of Optical PathĬavity Mode Hops Injection Current Tuning toĪn atomic Transition Frequency Wavemeter Structure of Rb The D 2Ĭontrolling the Tuning Parameters Laser Driver Spectral Range Gain Narrowing, Gain Selection Emission Line width External & Lasing Cavity Mode Structure Diffraction Grating Grating Equation, Littrow Configuration External Cavity Output Blazed Holographic Grating Grating Bandpass Lasing Cavity Mode Selection External Cavity Modes, Mode Hops Expansion of Continuous Harold Metcalf, Stony Brook UniversityĪbstract Introduction Frequency Selective Optical Feedback Longitudinal Modes Transverse Modes Extended Cavity Feedback Cavity Q-Factor Central Wavelength, Modal Line width, Free Susan Metz - Stony Brook University - MSI Minor ProjectĪdvisor: Prof. Bob Azmoun - Stony Brook University - MSI Minor Project
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