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Device and method for measuring output laser field shape of terahertz quantum cascade laser

A technology of quantum cascade and measurement device, applied in the field of terahertz applications, to achieve the effect of improving application advantages, improving accuracy and reliability, and measuring means quickly and intuitively

Inactive Publication Date: 2012-07-18
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the laser beam performance of THz QCL has been well improved, there is no frequency-matched photodetector array at present, and only thermal detector arrays can be used to characterize its laser beam pattern.

Method used

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  • Device and method for measuring output laser field shape of terahertz quantum cascade laser
  • Device and method for measuring output laser field shape of terahertz quantum cascade laser
  • Device and method for measuring output laser field shape of terahertz quantum cascade laser

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Embodiment 1

[0033] see figure 1 , which is a schematic diagram of a measurement device for the output laser field shape of a terahertz quantum cascade laser according to the present invention. As shown in the figure, the present invention provides a measurement device for a terahertz quantum cascade laser output laser field shape, which at least includes a laser part 1 and laser detection part 2.

[0034] Wherein, the laser part 1 includes a driving power source 11 , a cold head 12 , a heat sink 13 , a terahertz quantum cascade laser 14 , and a polyethylene window 15 . The laser detection part 2 includes a thermal imager 21 .

[0035] The driving power supply 11 is used to provide electrical signals. In this embodiment, the driving power supply 11 is a programmable DC stabilized power supply, which can output voltage or current. The voltage / current signal output range is: 0-6A (corresponding to voltage 0~30V), 0~3.3A (corresponding voltage is 0~60V); output voltage rising edge≤100ms, ou...

Embodiment 2

[0043] Please refer to figure 1 This embodiment provides a method for measuring the laser field shape of the measurement device for the output laser field shape of the terahertz quantum cascade laser described in the first embodiment above, and the method at least includes the following steps:

[0044] Step 1: According to the analysis results of the divergence characteristics of the laser beam emitted by the terahertz quantum cascade laser 14, the focal plane array 212 of the detection module 211 of the thermal imager 21 is vertically placed at a distance from the laser emission of the terahertz quantum cascade laser 14. within the preset distance from the end face. In this embodiment, the preset distance range is that the focal plane array 212 of the detection module 211 of the thermal imager 21 is vertically placed at a position 40 mm away from the laser emission end face of the terahertz quantum cascade laser 14 .

[0045] Step 2, using the drive power supply 11 to apply ...

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Abstract

The invention provides a device and method for measuring the output laser field shape of a terahertz quantum cascade laser. The device comprises a laser part and a laser detection part, wherein the laser part comprises a driving power supply, a cold head, a hot sink installed in the cold head, a terahertz quantum cascade laser installed on the hot sink and a polyethylene screen installed on the cold head; and the laser detection part comprises a thermal imager. The invention has the advantages that the thermal imager with mature manufacturing technologies, stable and reliable performance and real-time display function is used as a detection device of a laser beam output by the terahertz quantum cascade laser, the two-dimensional distribution situation of the laser beam section within a certain distance range away from the outgoing end face of the laser can be measured by the device in real time, and a good technical means is provided for the terahertz quantum cascade laser on performance testing in the imaging application aspect.

Description

technical field [0001] The invention relates to the technical field of terahertz applications, in particular to a measurement device and method for measuring the output laser field shape of a terahertz quantum cascade laser based on a thermal imager. Background technique [0002] Terahertz quantum-cascade laser (THz QCL) is a compact electronic device based on semiconductor materials, which has the characteristics of high energy conversion efficiency, small size, easy integration and long service life. With the rapid development of energy band engineering and material growth technology, THz QCL has made great progress in improving device performance and expanding device applications since it was first successfully developed in 2002. So far, the highest operating temperature of THz QCLs reported in the literature is 186K in pulse mode and 117K in continuous mode; the highest output power can reach 248mW (pulse mode) and 130mW (continuous mode) respectively under optimal worki...

Claims

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Application Information

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IPC IPC(8): G01J5/10H01S5/00
Inventor 谭智勇曹俊诚郭旭光陈镇
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI