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Method for maintaining the synchronism of fourier domain mode locked (FDML) laser

A Fourier domain lock and laser technology, which is applied to lasers, laser components, laser monitoring devices, etc., can solve the problems of increased shutdown and laser emission deterioration

Pending Publication Date: 2020-02-04
OPTORES GMBH
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Problems solved by technology

Thus, at round-trip propagation frequencies of a few hundred kilohertz, a change in tuning rate of a few millihertz can cause an increase in turn-off and consequently a significant deterioration in lasing emission

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  • Method for maintaining the synchronism of fourier domain mode locked (FDML) laser
  • Method for maintaining the synchronism of fourier domain mode locked (FDML) laser
  • Method for maintaining the synchronism of fourier domain mode locked (FDML) laser

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Embodiment Construction

[0049] An exemplary experimental configuration of an FDML laser has a resonator length of approximately 500 m, a round-trip propagation frequency of 411 kHz, a tuning bandwidth of approximately 130 nm, and a tuning rate of 411 kHz. The passband wavelength λ(t) here follows a sinusoidal function at the center wavelength λ 0 =time profile around 1295 nm, but for lasers only the ascent section of the sinusoidal function, which extends as linearly as possible, corresponds to one-eighth of the function profile. Correspondingly, the laser-active medium is only optically pumped for one-eighth of each propagation period. Therefore, the duration of the scan is 1 / 3.288MHz = 304 nanoseconds.

[0050] FIG. 1 shows the intensity distribution of the outcoupled laser component measured with the aid of a high-resolution oscilloscope (detection bandwidth 50 GHz) over the duration of the scan. Thus, the time axis corresponds simultaneously to the wavelength axis, and the average intensity var...

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Abstract

The invention relates to a method for maintaining the synchronism of a Fourier Domain Mode Locked (FDML) laser, the FDML laser comprising at least one dispersion-compensated resonator with at least one variably wavelength-selective optical filter, the laser light circulating in the resonator at a circulation frequency, and the wavelength selectivity of the filter being repeatedly modified at a syntonising rate, the FDML laser being synchronous when the syntonising rate is an integral multiple of the circulation frequency. Said method is characterised by the following steps: a) at least a portion of the laser light is coupled out of the resonator; b) at least a portion of the decoupled laser light is detected by means of a photodetector; c) amplitudes in the measuring signal of the photodetector are counted during successive counting intervals; and d) the circulation frequency or syntonising rate is adjusted such that the ratios of the count value to the lengths of the counting intervals are maintained within a predetermined nominal value interval.

Description

technical field [0001] The present invention relates to a method for maintaining synchronization of Fourier domain mode-locked (FDML) lasers. Background technique [0002] The FDML laser has at least one resonator with at least one variable wavelength-selective optical filter, wherein the laser light propagates in the resonator with the round-trip propagation frequency (Umlauffrequenz), and the filter is repeatedly The tuning frequency varies in its wavelength selectivity. Here, the average number of times a filter passes through its tuning bandwidth per unit time is referred to as the tuning rate. If the filter is tuned exactly periodically, for example by means of electronic control, this can also be referred to as the tuning frequency. [0003] It is important for continuous operation of the laser that the tuning rate of the filter is synchronized with the round-trip propagation frequency of the laser light so that each of the spin wavelengths reaches the filter again a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/137H01S3/139H01S3/08H01S3/106H01S3/13H01S3/00
CPCH01S3/08013H01S3/1062H01S3/1305H01S3/1307H01S3/137H01S3/139H01S3/0014H01S2301/02H01S3/1109H01S3/08004
Inventor 罗伯特·休伯汤姆·法伊弗
Owner OPTORES GMBH
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