T/CI 029-2022 Active Group standards

T/CI 029-2022 Narrow-linewidth laser beam testing specifications

Publish Date: 2022-04-28 Implement Date: 2022-04-28 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/CI 029-2022

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Other standards related to optics and optical measurement

Publish Date: 2022-04-28

Implement Date: 2022-04-28

Scope

Scope: This standard specifies the test specifications for the main performance parameters of narrow-linewidth lasers. This standard is applicable to the determination of the main performance parameters of narrow-linewidth lasers; Main technical content: Laser linewidth - the spectral linewidth of the laser output signal on the frequency coordinate axis, with the numerical value corresponding to the frequency width at the center of the peak of the laser spectrum after Lorentzian line fitting. The Lorentzian line shape - the distribution of spectral line intensity as a function of frequency conforms to the following formula: g_L (ν) = Δυ/2π [(υ - ν_0) 2 + (Δυ)?2] (1) where: g_L (ν) - the Lorentzian line function, unit is Hz (1/Hz); ν - frequency, unit is Hz; Δυ - frequency spectral width, unit is Hz; ν_0 - the center frequency of the spectral line, unit is Hz. [GB/T 15313-2008, Definition 2.1.24] Narrow-linewidth lasers - lasers with single longitudinal mode, extremely narrow linewidth, and extremely low frequency noise and phase noise, with excellent frequency stability, are known as narrow-linewidth lasers. Frequency noise - the random fluctuations of the instantaneous frequency of the laser output, referred to as frequency noise. Phase noise - the short-term continuous fluctuations of the laser phase caused by quantum noise, gain medium disturbance, etc., referred to as phase noise. Relative intensity noise - the unilateral spectral density when the laser power fluctuation is normalized to the square of the average power, which is a function of frequency f. [GB/T 15313-2008, Definition 2.1.111]