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Semiconductor pumped full-cavity microchip laser device with stable output wavelength

A microchip laser and semiconductor technology, applied in the field of lasers, can solve problems such as laser temperature effects, and achieve the effects of accurate and stable laser wavelength, stable temperature, and high temperature control accuracy

Active Publication Date: 2012-05-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the generation of heat is still unavoidable, and the temperature fluctuation of the environment will also affect the laser temperature

Method used

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  • Semiconductor pumped full-cavity microchip laser device with stable output wavelength
  • Semiconductor pumped full-cavity microchip laser device with stable output wavelength
  • Semiconductor pumped full-cavity microchip laser device with stable output wavelength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: only Nd:YAG crystal 12 is provided with insulation space 6

[0030] Such as image 3 As shown, the thermal insulation space 6 of the present embodiment includes a base 62 arranged in a thermal insulation shell 61, a felt 63 for heat insulation is arranged between the base 62 and the thermal insulation shell 61, and the base 62 and the shell 61 A light hole is correspondingly arranged on the top, the pump beam A enters from one side, and the laser beam B outputs from the other side. The Nd:YAG crystal 12 is placed at the entrance of the light hole of the base 62 and fixed on the base 62 through a gland 64 . The temperature sensor 2 is also arranged in the heat preservation housing 61 , the temperature measuring probe of the temperature sensor 2 is attached to the Nd:YAG crystal 12 , and the electric lead of the temperature sensor 2 passes through the housing 61 . The cooling element 5 is disposed at the bottom of the base 62 , and a cooling fin 65 is disp...

Embodiment 2

[0031] Embodiment 2: heat preservation space 6,7 is set for semiconductor pump source 11 and Nd:YAG crystal 12 respectively

[0032] Such as Figure 5 As shown, in this embodiment, while the Nd:YAG crystal 12 is provided with the same heat preservation space 6 as the embodiment 1, a similar heat preservation space 7 can also be provided for the semiconductor pump source 11 . In the thermal insulation space 7, a temperature sensor 2' and a cooling element 5' identical to the temperature sensor 2 and the cooling element 5 are additionally set for the semiconductor pump source 11, and a temperature sensor 2 is set in the temperature driving device 3 to provide a driving current for the cooling element 5'. H-bridge 32'. The temperature sensor 2' on one side of semiconductor pump source 11 is connected in parallel with the temperature sensor 2 on one side of Nd:YAG crystal 12 to the same error amplifier 31; The cooling element 5 on one side of the YAG crystal 12 and the H-bridge ...

Embodiment 3

[0034] Embodiment 3: Semiconductor pump source 11 and Nd:YAG crystal 12 are arranged in the same heat preservation space 8

[0035] Such as figure 1 , Image 6 As shown, the thermal insulation space 8 of this embodiment includes a heat sink 81, a pump source base 82, a front plate 83, a crystal base 84, a crystal gland 85, a back plate 86, a window 87, an upper seat for adjustment 88 and a lower seat for adjustment 89. Both the front plate 83 and the back plate 86 are made of insulating material with a certain thickness and hardness, such as polytetrafluoroethylene, etc., and the heat sink 37 can be made of duralumin. The two sides of the window 87 are respectively coated with 1064nm anti-reflection coatings, so as to emit as much as possible the stable laser beam of the Nd:YAG crystal 12 with a wavelength of 1064nm. In this embodiment, the pump source base 82 , the Nd:YAG crystal base 84 and the crystal gland 85 can all be made of materials with good thermal conductivity, ...

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PUM

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Abstract

The invention relates to a semiconductor pumped full-cavity microchip laser device with stable output wavelength, which is characterized by comprising a laser device, a temperature sensor, a temperature drive unit, a temperature control device and a refrigerating element, wherein the laser device comprises a semiconductor pumping source, a Nd:YAG crystal and a closed thermal insulation space arranged for the Nd:YAG crystal; a thermoprobe of the temperature sensor contacts with a surface of the Nd:YAG crystal; the temperature drive unit comprises an error amplifier and an H bridge; the temperature control device comprises a data acquisition card and a computer which is connected with the data acquisition card in two directions; a control and display module and a PID digital compensating network are arranged in the computer; the error amplifier and the temperature sensor are electrically connected with each other; the data acquisition card is electrically connected with the error amplifier; the control and display module compares the existing temperature digital signal with the preset standard temperature value to obtain a temperature difference value; and the PID digital compensating network carries out PID digital compensation according to the temperature difference value, and transmits the obtained feedback conditioning signal to the H bridge for power amplification, thereby driving temperature of the refrigerating element. The invention can be widely used in the fields of laser precision measurement and laser technology.

Description

technical field [0001] The invention relates to a laser, in particular to a semiconductor-pumped full-cavity microchip laser with stable output wavelength. Background technique [0002] All-cavity diode-pumped microchip lasers have the advantages of high pumping efficiency and less residual heat, so they are widely used in interferometry. For example, semiconductor pumps are used in the feedback interferometer of quasi-common path microchip lasers A Nd:YAG microchip laser was used as the light source. The principle of interferometry ultimately traces the measured value to the light wavelength of the light source, which means that the basis for the interferometry system to achieve accurate measurement depends on the accuracy and stability of the output wavelength of the light source. A large part of the heat of the semiconductor end-pumped Nd:YAG microchip laser is generated by the power emitted by the LD to the microchip. Because it is end-pumped, this laser has its own un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/06H01S3/131H01S3/042
Inventor 谈宜东张亦男张书练
Owner TSINGHUA UNIV
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