Title :
Frequency stability measurements of 1.5 μm erbium lasers locked to acetylene absorption lines
Author :
Svelto, Cesare ; Bava, Elio
Author_Institution :
Dept. of Electron. & Inf., Politecnico di Milano, Italy
fDate :
4/1/1999 12:00:00 AM
Abstract :
We report on the absolute frequency stabilization of Yb-Er:glass lasers against different acetylene absorption lines in the 1.5 μm spectral region. An external frequency modulation technique was adopted to independently stabilize two diode-pumped erbium microlasers against the P(15) rovibrational line at 1534.099 nm. A long-term frequency stability below 10-9 (200 kHz) was measured on both the closed-loop error signal and on the beat note frequency. From the beat signal analysis, a 1 ms laser linewidth of 50 kHz was observed. The Allan standard deviation of the beat frequency was below 10-10 for integration times between 10 ms and 1 s and as low as 4×10-11 around 0.1 s
Keywords :
erbium; laser frequency stability; organic compounds; solid lasers; 1.5 micron; Allan variance; Yb-Er:glass laser; acetylene absorption line; beat signal; closed loop error signal; diode pumped erbium microlaser; frequency locking; frequency modulation; frequency stability; integration time; linewidth; rovibrational line; Absorption; Erbium; Frequency measurement; Frequency modulation; Glass; Laser beams; Laser stability; Pump lasers; Semiconductor diodes; Solid lasers;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
