Abstract
In atomic physics experiments, a frequency-stabilized or ‘locked’ laser source is commonly required. Many established techniques are available for locking close to an atomic resonance. However, in many instances, such as atomic magnetometer and magic wavelength optical lattices in ultra-cold atoms, it is desirable to lock the frequency of the laser far away from the resonance. This review presents several far off-resonance laser frequency stabilization methods, by which the frequency of the probe beam can be locked on the detuning as far as several tens of gigahertz (GHz) away from atomic resonance line, and discusses existing challenges and possible future directions in this field.
Highlights
In 1958, Townes and Schawlow took the first step on the road to the laser by establishing general physical conditions for light amplification by the stimulated emission of radiation (LASER) [1]
(RF) current-modulated diode laser which is injection locked to a 780 nm reference diode laser
University realized laser frequency stabilization of an optical transfer cavity based on PDH technology
Summary
In 1958, Townes and Schawlow took the first step on the road to the laser by establishing general physical conditions for light amplification by the stimulated emission of radiation (LASER) [1]. The cavity was previous study on narrow-linewidth lasers was limited by length instability of optical reference protected from noise by mounting it on anetaluminum v-block inside an evacuated chamber. The laser locked by the technique achieved sub-hertz linewidth and relative frequency stability vibration reduction was complex and hard to realize. AThe diode laser to the thermal-noise-limited passive optical cavity in vertical mounting configuration by associated reduction of the vibration sensitivity of the effective cavity length resulted in a simple technique [31]. JILAcould locked diode laser tonon-negligible the thermal-noise-limited passive optical cavity in vertical mounting design conceptby of PDH the vibration-insensitive optical cavity, horizontally-oriented configuration technique [31]. High frequency-stabilized, narrow-linewidth lasers have been constructed by PDH technique to lock the the laser laserfrequencies frequenciestoto resonance of reference cavities.
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