Control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus

A technology of laser generation and control method, applied in the field of laser, to achieve the effect of realizing large-scale translation and improving the wavelength acceptance bandwidth of QPM

Inactive Publication Date: 2014-05-28
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, further studies have found that the inherent dispersion of PPLN crystals makes the broadened idler QPM band only exist near the mid-infrared 3.4 μm, making it difficult to effectively cover other wavelength regions

Method used

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  • Control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus
  • Control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus
  • Control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0025] A mid-infrared difference frequency generation laser generator based on PPLN crystals such as figure 1 As shown, it includes the pump source generator DL ​​with a fixed wavelength in the 1060nm band, the first and second polarization controllers PC1 and PC2 for the tunable signal source generation in the 1550nm band, the 1060 / 1550nm broadband wavelength division multiplexer WDM, and the collimation Convergence system M1, PPLN crystal, collimating lens M2, filter M3. The output fiber of the pump source generator DL ​​with a fixed wavelength of 1060nm, and the output fiber of the tunable signal source generator ECDL with a wavelength of 1550nm respectively pass through the first, The second polarization controllers PC1 and PC2 are connected to the 1060 / 1550nm broadband wavelength division multiplexer WDM, and the collimating and converging system M1, PPLN cry...

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Abstract

The invention discloses a control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus and belongs to the technical filed of laser. According to the method, QPM wavelength acceptation bandwidth of an intermediate infrared idler frequency light is greatly improved through increasing temperature gradient at the two ends of PPLN crystal. Under the premise of keeping the temperature gradient at the two ends of the PPLN crystal, the position of the idler frequency light QPM band can be offset by adjusting temperature at the initiating terminal and end terminal of the PPLN crystal, and finally broad tuning intermediate infrared laser output is obtained.

Description

technical field [0001] The invention discloses a control method of a wide-tuning mid-infrared difference frequency generating laser generating device, which belongs to the field of laser technology. Background technique [0002] The 3-5μm band continuous wave tunable mid-infrared laser source has important applications in trace gas detection. So far, a variety of mid-infrared light sources have emerged based on different laser generation mechanisms, such as quantum cascade lasers, lead-salt lasers, color center lasers, parametric oscillators, etc. Among them, the quasi phase matching (QPM, Quasi Phase Matching) difference frequency generation (DFG, Difference Frequency Generation) mid-infrared light source has become the mainstream light source for spectral detection applications due to its advantages such as simple structure, convenient tuning, narrow line width and room temperature operation. . For equiperiod periodically polarized crystals, the quasi-phase matching wave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/10H01S3/0941
Inventor 常建华顾久驭王亚炜尹杰
Owner NANJING UNIV OF INFORMATION SCI & TECH
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