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A Method of Laser Bias Frequency Locking Using Scanning Confocal Cavity f-p Interferometer

An F-P, interferometer technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of complex technology, multiple radio frequency components, limited frequency shift range, etc., to reduce complexity and reduce the number of components.

Active Publication Date: 2016-08-24
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

We can lock the laser within the absorption line through existing mature methods such as PDH (Pound-Drever-Hall), but it is more difficult to lock the laser outside the absorption line
The conventional method uses laser frequency shifting equipment such as acousto-optic or electro-optic to lock the frequency into the absorption spectrum line. The disadvantage of this method is that the frequency shifting range is limited, and it requires a lot of radio frequency components (frequency greater than 1GHz), which is costly. technical complexity

Method used

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  • A Method of Laser Bias Frequency Locking Using Scanning Confocal Cavity f-p Interferometer
  • A Method of Laser Bias Frequency Locking Using Scanning Confocal Cavity f-p Interferometer
  • A Method of Laser Bias Frequency Locking Using Scanning Confocal Cavity f-p Interferometer

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Embodiment Construction

[0023] Specific implementation methods such as figure 2 As shown, including: main laser, beam splitter (BS2), acousto-optic modulator (EOM), gas cell, photodetector, local oscillator, mixer (Mixer), low-pass filter, PID controller, spectroscopic mirror (BS1), focusing lens (L1), F-P interferometer with piezoelectric (PZT), comparator (C), sawtooth wave generator, amplifier (A), time measurement (TDC) unit, microprocessor (MCU ), a slave laser whose wavelength can be adjusted by changing the current, temperature, or internal piezoelectric ceramics.

[0024] The wavelength of the main laser can be adjusted by changing the current and temperature or the internal piezoelectric ceramics, and the absolute frequency is stabilized by conventional methods, such as the PDH method, as follows: the main laser passes through the beam splitter BS2, a part of the light enters the F-P cavity, and the other part enters the EOM, EOM is driven by a local oscillator, the laser is frequency-shif...

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Abstract

The invention discloses a method for achieving laser frequency-offset-lock through an F-P interferometer. According to the method, a main laser locked through a traditional absolute frequency stabilizing method is used as a reference, the peak time difference between emergent signals of lasers of the main laser and lasers of an auxiliary laser for jointly transmitting an F-P cavity is used as frequency error signals, and then frequency-offset-lock of the main laser and the auxiliary laser is achieved. The large-range frequency-offset-lock can be achieved without a radio frequency device, and the F-P interferometer has the advantages of being simple in structure, high in stability and the like.

Description

technical field [0001] The present invention relates to a laser frequency locking technology, in particular to a method of using a scanning confocal cavity F-P interferometer to realize the offset frequency locking between two or more lasers, which is mainly used in systems that need to accurately control the wavelength of multiple lasers , such as differential absorption lidar systems. Background technique [0002] Differential absorption lidar systems often require multiple frequency-stabilized laser sources. Some laser wavelengths are within the molecular or atomic absorption line, and others are outside the atomic absorption line. We can lock the laser within the absorption line through existing mature methods such as PDH (Pound-Drever-Hall), but it is more difficult to lock the laser outside the absorption line. The conventional method uses laser frequency shifting equipment such as acousto-optic or electro-optic to lock the frequency into the absorption spectrum line....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/13
Inventor 胡以华刘豪舒嵘洪光烈郑龙葛烨
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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