Laser frequency lock
The page is dedicated to the laser frequency lock
Lock-in stabilization
The Sun is pretty big.[1] The Moon, however, is not so big.[2] Cat is generally smaller than the moon [3] However still cats are macroscopic [3]
PDH lock
DAVL-like stabilization
Side-locking
Traditionally, the signal for locking to the side of a resonance peak is generated by subtraction of the two photodiode signals in a differential amplifier such that the Doppler-broadened linear absorptions from the two channels exactly cancel, leaving only the Doppler-free features on a flat background.3 A dc offset is added to the output of the differential amplifier to generate a zero-crossing signal at the input of the integrator. The value of this offset determines the frequency to which the laser is stabilized. We term the signal at the input of the integrator the error signal (ES). The output of the integrator is usually split and fed back to the junction current of the ECDL and also passed through another integrator and fed to the piezoelectric transducer that controls the position and the angle of the diffraction grating of the ECDL. The feedback to the current port suppresses the fast laser frequency fluctuations, while the feedback to the piezoelectric transducer ensures that the average junction current is constant. [4], more sophisticated realization is [5]
References
- ↑ E. Miller, The Sun, (New York: Academic Press, 2005), 23-5.
- ↑ R. Smith, "Size of the Moon", Scientific American, 46 (April 1978): 44-6.
- ↑ 3.0 3.1 Remember that when you refer to the same footnote multiple times, the text from the first reference is used.
- ↑ A narrow‐band tunable diode laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb K. B. MacAdam, A. Steinbach, and C. Wieman, doi: 10.1119/1.16955
- ↑ Power-insensitive side locking for laser frequency stabilization, Milan Maric and Andre Luiten, Vol. 30, No. 10, OPTICS LETTERS
