Adaptive narrow-linewidth semiconductor laser frequency stabilization device

Abstract

The invention discloses an adaptive narrow-linewidth semiconductor laser frequency stabilization device comprising a semiconductor laser, a beam collimating system, volume gratings, a heating device, an atomic gas chamber, a fluorescence measurement device and a signal processing and control system. The semiconductor laser, the beam collimating system and the volume gratings form an external chamber. The external chamber emergent laser spectrum is narrowed in comparison with that of the freely operating semiconductor laser 1 under the volume grating narrowband backward diffraction feedback effect. A part of emergent laser is incident to the atomic gas chamber to excite alkali metal atoms to generate resonance fluorescence. The fluorescence measurement system detects a fluorescence signal and inputs the fluorescence signal to the signal processing and control system. The signal processing and control system changes the grating temperature by regulating the heating power of the heating device in the volume gratings so as to change the emergent laser central wavelength. The adaptive narrow-linewidth semiconductor laser frequency stabilization device has the advantages of effectively enhancing pumping system spectrum stability, use convenience and environment adaptability.

Description

technical field [0001] The invention mainly relates to the technical field of lasers, in particular to an adaptive narrow-linewidth semiconductor laser frequency stabilization device for alkali metal laser pumping. Background technique [0002] Alkali metal lasers use semiconductor lasers to pump the saturated vapor of alkali metal atoms, and use the energy level transition of valence electrons in the outer shell of alkali metal atoms to achieve laser output. This type of laser combines the advantages of semiconductor laser high power output and gas medium flow heat dissipation, has the characteristics of all-electric operation, light weight and compactness, high quantum efficiency and good atmospheric transmission characteristics, and has good high power output potential. Aerospace and military fields have potential application value. [0003] The realization of alkali metal laser depends on high-quality semiconductor pump source, which has strict requirements on its spect...

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Problems solved by technology

It should be pointed out here that for low-power single-frequency semiconductor lasers, although there is a mature active wavelength control scheme based on the saturation absorption of alkali metal atomic gas chambers, this scheme requires the semiconductor laser to work in a single longitudinal mode state and the alkali metal The atomic gas chamber does not contain other buffer gases so that the ultrafine structure of the alkali metal atomic energy level can be resolved, but the operation of the alkali metal laser does not meet the above conditions, so the saturated absorption frequency stabilization method cannot be used

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