Frequency Stabilization Of 689nm Diode Laser With High Fineness Cavity

The frequency stabilization of 689nm diode laser for second cooling of atomic strontium has been designed with the PDH (Pound-Drever-Hall) frequency stabilization system. Measure the ring-down signal of the high fineness F-P cavity which is the reference of frequency, laser pattern matching and frequency locking circuitMeasure the ring-down signal of the high fineness F-P cavity in use of C-W laser source at 689nm to gain the cavity fineness. Modulate the c-w laser source in AOM to get the standard ring-down signal. Analyze the ring-down signal in way of the function simulation .Compared and analyzed the data of different transmission intensity to test the measurement.High laser pattern matching effect has been achieved in use of Gauss pattern matching theory. The coupling effect between laser resonance and F-P cavity is reaching 50%.the output laser beam is single longitudinal mode in basically.The luck frequency circuit is based on the 532nm laser luck frequency circuit. Redesign the locking circuit in order to sustain the high frequency sign. EOM has been drove successfully. The whole locking frequency system has been actualized. It is the important step of the frequency stabilization of 689nm diode laser system.