Application of miniature diaphragm pump in laser industry

1. Background introduction

Laser – a device that can generate laser light. Since its advent in 1958, it has been rapidly iterated over decades, its functions have been continuously improved, its size has gradually decreased, and its components have become more sophisticated. It has been widely used in high-tech fields such as communications, medical treatment, and military. A revolutionary breakthrough was made. It can be divided into four categories based on its working medium: gas lasers, solid lasers, semiconductor lasers and dye lasers. Currently, lasers are widely used in industrial manufacturing fields such as laser precision cutting, laser 3D printing, laser marking, and laser etching.

2. Application introduction

For gas lasers, the laser generator can generate light sources of different wavelengths based on the gas medium carried by the resonant cavity, and their uses are also different:

1). Helium-neon laser: the most important red light radiation source (632.8 nm)

2). Carbon dioxide laser: wavelength is about 10.6 μm (infrared), important industrial laser

3). Carbon monoxide laser: wavelength is about 6-8 μm (infrared), only works under cooling conditions

4). Nitrogen laser: 337.1 nm (ultraviolet)

5). Mixed gas laser: does not contain pure gas, but several gases mixture (generally argon, krypton, etc.)

Here we take the carbon dioxide laser as an example. It is a gas laser that uses CO2 gas as the working substance. The resonant cavity is filled with CO2 and auxiliary gases such as He and N2. Under the action of the circulation miniature diaphragm pump, it continuously reciprocates in the pipeline and passes through A strong voltage is applied to the resonant cavity to form a current.

During the discharge process, the N2 molecules in the cavity are excited by the impact of electrons, collide with the CO2 molecules, and transfer the energy to the CO2 molecules. The CO2 molecules jump from a low energy level to a high energy level and are released. When the photons are emitted, under the joint action of the reflecting mirror and the output mirror in the resonant cavity, the photons transfer energy to more CO2 molecules, causing more other CO2 molecules to enter a group emission state and release more photons to form a laser.

1). Carrier gas process: The working medium and auxiliary gas to be excited are sucked in through the miniature diaphragm pump and loaded into the pipeline.

2). Circulation process: The miniature diaphragm pump realizes gas circulation inside the pipeline to ensure that a sufficient number of CO2 molecules transition effectively to produce stable laser.

As a carrier gas circulation miniature diaphragm pump, the micro air pump is equivalent to the power that drives the gas to circulate and circulate in the laser. It needs to meet various requirements for gas circulation under the working condition of the laser.

3. Project Difficulties

1). Does not pollute the loaded gas medium, does not contain oil and other impurity components, and avoids interference from other molecules entering the resonant cavity.

2). The circulation pump needs to maintain stable flow and pressure during the use of the equipment to obtain stable fluid transmission, and at the same time, it cannot pollute the gas medium and has high stability.

3). The carrier gas pump and circulation pump require extremely high air tightness to ensure that the gas leakage rate is extremely low.

4). Long life. Under ideal conditions, the working life of the miniature diaphragm pump needs to be greater than or equal to the working life of the laser, so that the laser can be maintenance-free and replacement-free during the entire life of the laser.

4. Solution for Miniature Diaphragm Pump

D23 series miniature diaphragm pump

Purpose: Used as a carrier gas pump and circulation pump to supply gas to the system and circulate the gas inside the pipeline.

Brief description: The miniature diaphragm pump can generate negative pressure at the suction port to suck in gas, and apply a positive pressure at the exhaust port to discharge gas. Suitable for sampling, gas circulation and other scenarios.

advantage:

1). Small size, stable flow, moderate positive and negative pressure, reinforced nylon and EPDM rubber materials, and good tolerance to corrosive gases and radioactive gases;

2). The use of interference-free brushless motors will not affect other pressure-sensitive components of the equipment;

3). Both the air extraction port and the exhaust port can carry large loads, and adopt double sealing method, with low leakage rate and good air tightness;

4). Using magnetic silencing technology, it has low operating noise, stable performance, high parameter consistency, long life, and a continuous working life of more than 10,000 hours.