CN2078051U

CN2078051U - Laser bar

Info

Publication number: CN2078051U
Application number: CN 90205494
Authority: CN
Inventors: 薛志银
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-05-03
Filing date: 1990-05-03
Publication date: 1991-05-29

Abstract

The utility model relates to a novel laser bar which belongs to the field of solid laser material processing and the field of laser operating substance cooling. The novel laser bar realizes the rotating flow of cooling liquid as well as the simultaneous cooling of the center and the surrounding border of the laser bar by notching on the column surface thereof, changing the shape of the cross-section, enlarging the heat delivery surface and directing the direction of the cooling liquid flow. The utility model can overcome heat distortion and increase the capability of the resistance to damage of laser operating substance in connection, high repeat frequency, high power, high average power, high brightness and narrow pulse width of high peak power while at work. The laser bar, particularly the novel straight-line notching laser bar, can make a laser bar with major diameter into a laser device. The laser bar has no radial thermal gradient, and then a single laser head can obtain the high-power output of laser.

Description

Laser bar

The utility model belongs to solid laser material processing and solid laser working substance cooling technology field.

The operation material shape of solid state laser selects have various factors to cause.One of them is to help the working-laser material heat radiation.Because the total elementary heat problem of laser material is hot distortion, thermally induced birefringence, thermal stress-cracking.Influence is the key that obtains high light beam quality, high power output to wavefront so the restriction thermal gradient increases and reduce thermal gradient.Therefore external is to solve this type of problem to have done many work.

In the opticaly-pumpedsolidlaser in the past, their operation material is processed to the garden cylindricality usually.This laser bar is at present by extensively practical both at home and abroad.People also produce hollow garden cylindricality laser bar on this basis in addition.For better heat radiation, people have also made slab, dish type etc.Purpose is to increase cooling surface under given laser material volume situation.The slab laser bar has been declared United States Patent (USP) in 1972 by GE.The patent No.: NO.3.633.126.

The purpose of this utility model: the new model that provides the cooling laser operation material.Come expansion of laser light operation material radiating surface whereby, reduce the heat distortion, reduce thermal lensing effect, the survivability when improving working-laser material and under high-power, high brightness conditions, working.Realize that a laser head obtains the high-power output of laser.And provide new laser bar sealing-in mounting technology.

The utility model content is:

This is novel to be several thread-shaped of processing or linear cutting on the laser bar cylinder, and is processed with step, cannelure at the two ends of laser bar.And the non-light path district on the laser bar end face has louvre.

In fact, the utility model is by to Materialbearbeitung mit Laserlicht, improves the sealing-in mounting technology of the working-laser material state of cooling and laser bar.Thereby improve the working-laser material cooling effectiveness, guarantee that the laser bar after the sealing-in collimates and excellent sealing performance all the time with metal sleeve.

Concrete technology implementation is:

The new pattern laser rod that the screw thread cutting is arranged is practical outer circular end grinding machine and self-made tool, machining screw cutting on the cylinder of laser bar garden.Also outside the threaded line of laser bar two ends, process cannelure in addition.

The new pattern laser rod that the straight line cutting is arranged is to utilize self-made tool and special cutting tool, the processing linear cutting on the laser bar cylinder of practical common outer garden cutting machine, and these cuttings are parallel to each other.But, to stay one section not cutting at the two ends of new pattern laser rod, as connected body.On the connected body external diameter, be processed with step, on step, be processed with cannelure.For connected body is better dispelled the heat, on the new pattern laser plane rod end, cutting place processing louvre on the corresponding laser bar cylinder.The diameter of these louvres can not more can not be connected with cutting on the cylinder greater than cutting width on the laser bar cylinder.Can accomplish like this; Promptly do not reduce the clear aperature of laser bar, can guarantee the cooling fluid sealing again.Can also make the laser bar end-face heat sinking good.

The new pattern laser rod is to utilize laser bar two ends step and cannelure, realizes location, the collimation of metal sleeve with laser bar.Plasticity " O " type ring is used for sealing." O " type ring is placed in the cannelure, load onto metal sleeve and metal sleeve is fixing together with laser bar.They are combined as a whole to realize sealing-in.

The concrete structure of utility model is provided by accompanying drawing;

Fig. 1 is the new pattern laser rod profile that the screw thread cutting is arranged on the laser bar cylinder.

Fig. 2 is the new pattern laser rod profile that the straight line cutting is arranged on the laser bar cylinder.And the sectional view of selecting arbitrarily.

Fig. 3 is the profile of new pattern laser rod after with the metal sleeve sealing-in.

Below in conjunction with Fig. 1, Fig. 2, Fig. 3 the utility model detail is described.

In Fig. 1: the screw thread cutting (1) that enlarges the heat-delivery surface and the direct coolant flow direction is arranged, the cannelure (2) of sealed laser rod and location metal sleeve is provided.

In Fig. 2: the laser bar that changes leads to optical cross-section face shape, expansion radiating surface, constitutes the straight line cutting (3) of cooling passage.And the step (4) that sealing, locating laser rod and metal sleeve are provided, and cannelure (5), end-face heat sinking hole (6).

In Fig. 3: new pattern laser rod (7) is arranged, the metal sleeve (8) of lengthening and sealed laser rod." O " type ring (9), fluid sealant (10).

Briefly: the new pattern laser rod is except expansion of laser light operation material radiating surface, the cooling effectiveness that improves laser bar, change laser bar cross section face shape, and the new pattern laser rod has solved the center cooling problem of major diameter laser bar.And can realize that cooling fluid centers on laser bar axle rotation symmetry and flows, thereby make the laser bar interior temperature distribution symmetrically.The sealing mounting technology of new pattern laser rod can guarantee that laser bar is with the collimation between the metal sleeve in addition.

Further specify the advantage of new pattern laser rod below.Because now practical all kinds laser bar, in the processing and manufacturing of laser bar and practical application, all there is shortcoming, the new pattern laser rod can overcome these shortcomings to a certain extent, therefore the novel performance that can improve solid state laser.For example: general garden cylindricality laser bar, big radial symmetry gradient is arranged, this temperature gradient is to strengthen with the laser bar diameter.Big thermal gradient can cause big heat distortion, therefore has a strong impact on the raising of beam quality and laser power.Cooling can't be forced in the inside of hollow garden cylindricality laser bar, and radial direction temperature difference is still very big.Slab has good radiating condition, but the optics difficulty of processing is very big, and wide and thin lath technique for fixing also is difficult.Making such lath simultaneously also needs the major diameter crystal, and the expense of growth major diameter crystal is very high.Surface scattering of disk laser cooling fluid and the optical loss that causes of decay, and the difficulty of technique for fixing also all make us disappointment.

The novel laser bar that the screw thread cutting is arranged has under the condition of identical clear aperature with garden cylindricality laser bar in maintenance, the further expansion of laser light rod of novel energy radiating surface, and can make the part cooling fluid along screw thread, moving around the laser bar symmetrical swirling flow.Thereby reduced the laser bar radial symmetry gradient.And make the laser bar radial temperature profile symmetrically.

The novel laser bar that the straight line cutting is arranged has changed the logical optical cross-section face shape of garden cylindricality laser bar fully.Novelly can realize laser bar center and the large tracts of land equal conditions cooling on border on every side.Therefore do not have radial symmetry gradient, light distortion is overcome to a great extent.Temperature field on its logical optical cross-section distributes, and can accomplish that the temperature field that is similar to slab structure laser bar distributes.The new pattern laser rod is equivalent to many laser bar parallel connections.Therefore can make the laser of many lamp pumped great-powers laser output.So this new pattern laser rod has the ability that just can obtain high-power output with a laser head, will change like this is to realize the high-power output of laser at present both at home and abroad, and must adopt the technology of cascade laser series connection.

According to calculating: the new pattern laser rod of a diameter phi 30mm, its effective clear aperature are equivalent to the summation of effective clear aperature of six diameter phi 10mm garden cylindricality laser bars.But the radiating surface of new pattern laser rod is but much larger than total area of dissipation of six diameter phi 10mm garden cylindricality laser bars.

The characteristics of the sealing-in mounting technology of new pattern laser rod, it is indeformable with the collimation between the metal sleeve to be that it can remain laser bar.Laser performance is improved for this and the raising of laser stability all can be helpful.

Claims

1, new pattern laser rod is characterized in that being processed with on the laser bar cylinder thread-shaped cutting (1) and linear cutting (3), cannelure (2), (5), step (4), louvre (6).

2, laser bar according to claim 1, it is characterized in that utilizing step (4) location, in ring shaped slot (2), (5), place " O " type ring or fluid sealant, can also go up at step (4) and place sealing gasket, carry out laser bar and assemble with the sealing between the metal sleeve.