阅读说明：本技术 载冷剂及制备方法、冷却结构、半导体激光巴条、热沉系统 (Secondary refrigerant, preparation method, cooling structure, semiconductor laser bar and heat sink system ) 是由 薄勇 朱铎 许家林 彭钦军 陈中正 于 2021-05-28 设计创作，主要内容包括：本发明公开了一种载冷剂及制备方法、冷却结构、半导体激光巴条、热沉系统,其低温运转半导体激光巴条的所述载冷剂包括按体积计的下述组分：氟化物100份；醇1-50份。该载冷剂具有无腐蚀性、低毒性、安全稳定、导热性优良、液态温域宽等特点,适用于低温运行的半导体激光巴条微通道热沉冷却结构,有效调节半导体激光巴条工作温度,提高半导体激光巴条电光效率。该载冷剂可以使其中的杂质水份凝固点降低至工作温度以下,防止产生冰颗粒堵塞热沉微通道。该载冷剂有一定的电导率,可在工作过程中防止静电荷的累积,避免产生静电打火问题。(The invention discloses a secondary refrigerant, a preparation method, a cooling structure, a semiconductor laser bar and a heat sink system, wherein the secondary refrigerant for operating the semiconductor laser bar at low temperature comprises the following components in volume: 100 parts of fluoride; 1-50 parts of alcohol. The secondary refrigerant has the characteristics of no corrosivity, low toxicity, safety, stability, excellent thermal conductivity, wide liquid temperature range and the like, is suitable for a semiconductor laser bar micro-channel heat sink cooling structure running at low temperature, effectively adjusts the working temperature of a semiconductor laser bar, and improves the electro-optic efficiency of the semiconductor laser bar. The refrigerating medium can reduce the freezing point of impurity moisture in the refrigerating medium to be lower than the working temperature, and prevents ice particles from blocking heat sink micro-channels. The secondary refrigerant has certain conductivity, can prevent the accumulation of static charges in the working process and avoid the problem of static ignition.)

1. A coolant for a cryogenically operated semiconductor laser bar, the coolant comprising by volume:

100 parts of fluoride;

1-50 parts of alcohol.

2. The coolant for a cryogenically operated semiconductor laser bar according to claim 1, wherein the coolant comprises the following components:

the volume ratio of the fluoride is 100 parts;

the volume ratio of the alcohol is 30 parts.

3. The coolant for a semiconductor laser bar operating at low temperature according to claim 1 or 2,

the fluoride is selected from one or more of pentafluoropropane, hexafluoropropane, heptafluoropropane and freon;

the alcohol is one or more of methanol, ethanol and glycol.

4. The method for preparing the coolant for the semiconductor laser bar operating at low temperature according to claim 1, comprising:

alcohols are added to the fluoride.

5. The method for preparing the coolant for the semiconductor laser bar operating at low temperature according to claim 4, further comprising:

stirring, and uniformly stirring the fluoride and the alcohol.

6. A microchannel heat sink cooling structure characterized by using the coolant for a cryogenically operated semiconductor laser bar according to any one of claims 1 to 3 as a low temperature coolant.

7. The microchannel heat sink cooling structure of claim 6,

the heat sink material of the thermal microchannel is copper or aluminum.

8. A semiconductor laser bar comprising the microchannel heat sink cooling structure of claim 6 or 7.

9. The semiconductor laser bar of claim 8,

the semiconductor laser bars are multiple, and a semiconductor laser bar array is formed.

10. The semiconductor laser bar according to claim 8 or 9,

the gain medium of the semiconductor laser bar is one of gallium arsenide, gallium nitride, cadmium sulfide, indium phosphide and zinc sulfide.

11. A micro-thermal tunnel heat sink system characterized by using the coolant of the cryogenically operated semiconductor laser bar according to any one of claims 1 to 3 as a cryogenic coolant.

Technical Field

The invention belongs to the technical field of semiconductor laser, and particularly relates to a secondary refrigerant, a preparation method, a cooling structure, a semiconductor laser bar and a heat sink system.

Background

The semiconductor laser has the advantages of high efficiency, narrow line width compared with a light emitting diode, full electric drive and the like, has wide application prospect, can effectively aim at the pump absorption wavelength of a solid laser crystal due to the characteristic of narrow line width particularly in the field of all-solid-state lasers, and is an ideal solid laser pump source. Because of the low output power of a single semiconductor laser, the semiconductor lasers are generally packaged into a one-dimensional array, which is called a semiconductor laser bar, and can be combined into a two-dimensional array, which is called a semiconductor laser array. In the process of using the semiconductor laser bar, partial power which cannot be converted into laser output becomes waste heat, so that the temperature of the bar is obviously increased. The temperature rise of the semiconductor laser will seriously affect the output efficiency of the semiconductor laser, and red shift the central wavelength of the laser output of the semiconductor laser, and in a serious case, the semiconductor laser may be damaged due to overhigh temperature.

In order to make the semiconductor laser bar have better output efficiency, the semiconductor laser bar is usually made to work at low temperature which is lower than zero degree in the process of temperature control. Due to the fact that local temperature rise is caused by micro-channel blockage, the phenomena of reduction of power of a laser semiconductor bar, instability of output wavelength and the like are caused, and under the severe condition, a single bar or even a large-area array can be burnt out. The occurrence of these conditions seriously threatens the operational stability and reliability of semiconductor laser bars or arrays and solid-state lasers using semiconductor lasers as pumping sources. In the working process of the low-temperature secondary refrigerant, the temperature of the pipeline and the joint is low, and the moisture in the air is easy to adhere to the outer pipe wall or the joint to be liquefied or frosted and possibly permeates into the pipeline to become impurity ice. The adopted low-temperature refrigerating medium is usually organic matter which is not melted with water, so that ice particles can keep a solid particle state and become solid impurities to block the micro-channel.

Disclosure of Invention

Objects of the invention

The invention aims to provide a secondary refrigerant, a preparation method, a cooling structure, a semiconductor laser bar and a heat sink system, and aims to solve the technical problems that ice particles generated in a micro-channel heat sink cooling structure block a heat sink micro-channel and are subjected to electrostatic ignition in the prior art.

(II) technical scheme

In order to solve the above problems, a first aspect of the present invention provides a coolant for operating a semiconductor laser bar at a low temperature, the coolant comprising the following components by volume: 100 parts of fluoride; 1-50 parts of alcohol.

Further, the refrigerating medium comprises the following components: the volume ratio of the fluoride is 100 parts; the volume ratio of the alcohol is 30 parts.

Further, the fluoride is selected from one or more of pentafluoropropane, hexafluoropropane, heptafluoropropane and freon; the alcohol is one or more of methanol, ethanol and glycol.

According to another aspect of the present invention, there is provided a method for preparing a coolant for operating a semiconductor laser bar at low temperature according to the above-mentioned scheme, comprising: alcohols are added to the fluoride.

Further, still include: stirring, and uniformly stirring the fluoride and the alcohol.

According to another aspect of the invention, a microchannel heat sink cooling structure is provided, wherein the coolant of the low-temperature operation semiconductor laser bar in any one of the above aspects is used as the low-temperature coolant.

Further, the heat sink material of the thermal microchannel is copper or aluminum.

According to yet another aspect of the present invention, there is provided a semiconductor laser bar comprising the microchannel heat sink cooling structure of any one of the above aspects.

Furthermore, the semiconductor laser bars are multiple, and a semiconductor laser bar array is formed.

Furthermore, the gain medium of the semiconductor laser bar is one of gallium arsenide, gallium nitride, cadmium sulfide, indium phosphide and zinc sulfide.

According to another aspect of the invention, a micro thermal channel heat sink system is provided, wherein the coolant of the low-temperature operation semiconductor laser bar in any one of the above aspects is used as the low-temperature coolant.

(III) advantageous effects

The technical scheme of the invention has the following beneficial technical effects:

the secondary refrigerant of the semiconductor laser bar running at low temperature has the characteristics of no corrosivity, low toxicity, safety, stability, excellent thermal conductivity, wide liquid temperature range and the like, is suitable for a semiconductor laser bar micro-channel heat sink cooling structure running at low temperature, effectively adjusts the working temperature of the semiconductor laser bar, and improves the electro-optic efficiency of the semiconductor laser bar. The refrigerating medium can reduce the freezing point of impurity moisture in the refrigerating medium to be lower than the working temperature, and prevents ice particles from blocking heat sink micro-channels. The secondary refrigerant has certain conductivity, can prevent the accumulation of static charges in the working process and avoid the problem of static ignition.

Drawings

FIG. 1 is a schematic structural view of a microchannel heat sink cooling structure according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a semiconductor laser bar according to an embodiment of the present invention.

Reference numerals:

1: a secondary refrigerant liquid pool; 2: the flow direction of the secondary refrigerant; 3: a liquid nitrogen pool; 4: the flow direction of liquid nitrogen; 5: a plate heat exchanger; 6: a semiconductor laser array operating at low temperature; 7: nitrogen flow direction; 8: a liquid inlet; 9: and a liquid outlet.

The arrows in fig. 2 indicate the flow of coolant in the semiconductor laser bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

In the drawings a schematic view of a layer structure according to an embodiment of the invention is shown. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.

It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

In the prior art, a micro-channel heat sink cooling structure is often used in the process of cooling a semiconductor laser bar. The flow channel with the hydraulic equivalent diameter smaller than 1mm is generally called as a micro-channel, and the micro-channel heat sink is a heat sink with a micro-channel structure, is a reinforced heat exchange device and has the advantages of compact structure, high heat exchange coefficient and the like. In the cooling process of the high-power semiconductor laser bar, a cooling structure is required to have higher heat exchange capacity, and a microchannel heat sink is generally used as the cooling structure.

In order to make the semiconductor laser bar have better output efficiency, the semiconductor laser bar is usually made to work at low temperature which is lower than zero degree in the process of temperature control. Due to the fact that local temperature rise is caused by micro-channel blockage, the phenomena of reduction of power of a laser semiconductor bar, instability of output wavelength and the like are caused, and under the severe condition, a single bar or even a large-area array can be burnt out. The occurrence of these conditions seriously threatens the operational stability and reliability of semiconductor laser bars or arrays and solid-state lasers using semiconductor lasers as pumping sources. In the working process of the low-temperature secondary refrigerant, the temperature of the pipeline and the joint is low, and the moisture in the air is easy to adhere to the outer pipe wall or the joint to be liquefied or frosted and possibly permeates into the pipeline to become impurity ice. The adopted low-temperature refrigerating medium is usually organic matter which is not melted with water, so that ice particles can keep a solid particle state and become solid impurities to block the micro-channel.

Another problem with semiconductor laser bar cooling structures operating at low temperatures is that the low temperature coolant is mostly organic and tends to be relatively pure and therefore tends to have a relatively low electrical conductivity. In the case of pentafluoropropane, the conductivity is only about 0.002 μ S/cm. and the coolant is in a high velocity flow regime during operation, which inevitably results in the build up of static charge. The low conductivity determines that the low-temperature secondary refrigerant cannot discharge the accumulated static charges in time, and when the static charges are accumulated to a certain degree, a local electric field may break down semiconductor laser bars, and the static voltage is accumulated in an array structure, so that the problem is more serious.

In one embodiment of an embodiment of the present invention, a coolant for a low temperature operation semiconductor laser bar is provided, the coolant comprising the following components by volume: 100 parts of fluoride; 1-50 parts of alcohol.

The secondary refrigerant of the semiconductor laser bar running at low temperature has the characteristics of no corrosivity, low toxicity, safety, stability, excellent thermal conductivity, wide liquid temperature range and the like, is suitable for a semiconductor laser bar micro-channel heat sink cooling structure running at low temperature, effectively adjusts the working temperature of the semiconductor laser bar, and improves the electro-optic efficiency of the semiconductor laser bar. The refrigerating medium can reduce the freezing point of impurity moisture in the refrigerating medium to be lower than the working temperature, and prevents ice particles from blocking heat sink micro-channels. The secondary refrigerant has certain conductivity, can prevent the accumulation of static charges in the working process and avoid the problem of static ignition.

In a preferred embodiment, the coolant can comprise the following components: the volume ratio of the fluoride is 100 parts; the volume ratio of the alcohol is 30 parts.

In an alternative embodiment, the fluoride is one or more of pentafluoropropane, hexafluoropropane, heptafluoropropane, and freon.

In an alternative embodiment, the alcohol is one or more of methanol, ethanol and ethylene glycol.

In a preferred embodiment, the fluoride is pentafluoropropane.

In a preferred embodiment, the alcohol is absolute ethanol.

In another embodiment of the present invention, a method for preparing a coolant for a semiconductor laser bar operating at low temperature according to the above-mentioned scheme is provided, which includes: alcohol is added to the fluoride.

In an alternative embodiment, the volume ratio of the fluoride to the alcohol is 100: 1-2: 1.

in an optional embodiment, the method may further include: stirring, and uniformly stirring the fluoride and the alcohol.

In an alternative embodiment, the fluoride is one or more of pentafluoropropane, hexafluoropropane, heptafluoropropane, and freon.

In an alternative embodiment, the alcohol is one or more of methanol, ethanol and ethylene glycol.

FIG. 1 is a schematic structural view of a microchannel heat sink cooling structure according to an embodiment of the present invention.

In another embodiment of the present invention, as shown in fig. 1, a microchannel heat sink cooling structure is provided by using the coolant of the cryogenically operated semiconductor laser bar according to any of the above embodiments as a low temperature coolant.

In an alternative embodiment, the heat sink material of the thermal microchannel is copper.

In an alternative embodiment, the heat sink material of the thermal microchannel is aluminum.

Fig. 2 is a schematic diagram of a semiconductor laser bar according to an embodiment of the present invention.

In one implementation of yet another embodiment of the present invention, as shown in fig. 2, a semiconductor laser bar is provided that may include a microchannel heat sink cooling structure as described in any of the above aspects.

The coolant of the semiconductor laser bar operating at low temperature enters from the liquid inlet 8, is separated, flows to the liquid outlet 9 from two ways, and finally flows out from the liquid outlet 9.

In an alternative embodiment, the semiconductor laser bars are multiple, and a semiconductor laser bar array is formed.

In an optional embodiment, the semiconductor laser bar array is formed by connecting a plurality of semiconductor laser bars in series, and the liquid outlet 9 of the nth semiconductor laser bar is communicated with the liquid inlet 8 of the (N + 1) th semiconductor laser bar (N is an integer not less than 1).

In an alternative embodiment, the semiconductor laser bar array is formed by a plurality of the semiconductor laser bars connected in parallel,

in an optional embodiment, the gain medium of the semiconductor laser bar is one of gallium arsenide, gallium nitride, cadmium sulfide, indium phosphide and zinc sulfide.

In an implementation manner of another embodiment of the present invention, a micro thermal channel heat sink system is provided, wherein the coolant of the low-temperature operation semiconductor laser bar according to any one of the above aspects is used as a low-temperature coolant.

Example 1

100ml of pentafluoropropane and 10ml of absolute ethanol were added to a beaker, and after stirring sufficiently with a glass rod, the temperature of the mixed solution was measured to be-25 ℃.

Example 2

100ml of pentafluoropropane and 20ml of absolute ethanol were added to a beaker, and after sufficiently stirring with a glass rod, the temperature of the mixed solution was measured to be-25 ℃.

Example 3

100ml of pentafluoropropane and 30ml of absolute ethanol were added to a beaker, and after sufficiently stirring with a glass rod, the temperature of the mixed solution was measured to be-25 ℃.

Example 4

100ml of pentafluoropropane and 30ml of absolute ethanol were added to a beaker, and after stirring sufficiently with a glass rod, the temperature of the mixed solution was measured to be-45 ℃.

A group of metal pieces was cooled to-45 c, liquid water was dropped thereon and frozen to obtain a group of metal pieces with ice, and put into the mixed solution described in examples 1-4 above to obtain table 1.

TABLE 1

Example 5

100g of pentafluoropropane was added to a beaker, and anhydrous ethanol was not added.

Example 6

97g of pentafluoropropane and 3g of absolute ethanol were added to a beaker, and the mixture was sufficiently stirred.

Example 7

80g of pentafluoropropane and 20g of absolute ethanol were added to a beaker, and the mixture was sufficiently stirred.

The conductivities of the refrigerants of examples 5-7 were measured and used separately to observe whether sparking occurred over a period of time (long run) to give Table 2.

TABLE 2

The invention aims to protect a secondary refrigerant, a preparation method, a cooling structure, a semiconductor laser bar and a heat sink system, wherein the secondary refrigerant for operating the semiconductor laser bar at low temperature comprises the following components in volume: 100 parts of fluoride; 1-50 parts of alcohol. The secondary refrigerant of the semiconductor laser bar running at low temperature has the characteristics of no corrosivity, low toxicity, safety, stability, excellent thermal conductivity, wide liquid temperature range and the like, is suitable for a semiconductor laser bar micro-channel heat sink cooling structure running at low temperature, effectively adjusts the working temperature of the semiconductor laser bar, and improves the electro-optic efficiency of the semiconductor laser bar. The refrigerating medium can reduce the freezing point of impurity moisture in the refrigerating medium to be lower than the working temperature, and prevents ice particles from blocking heat sink micro-channels. The secondary refrigerant has certain conductivity, can prevent the accumulation of static charges in the working process and avoid the problem of static ignition.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.