CN209823102U

CN209823102U - Pulse width adjustable solid laser

Info

Publication number: CN209823102U
Application number: CN201921187480.1U
Authority: CN
Inventors: 贾养春; 刘国宏
Original assignee: Shenzhen Laser Precision Co Ltd
Current assignee: Suzhou Baifu Laser Technology Co.,Ltd.
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2019-12-20
Anticipated expiration: 2029-07-26

Abstract

The utility model belongs to the technical field of lasers, in particular to a pulse width adjustable solid laser, which comprises a pumping shell and a crystal shell positioned on the right side of the pumping shell, the back side wall of the crystal shell is movably connected with a guide rail through a mechanical part, the top of the crystal shell is connected with the output end of a stepping motor, the inner cavity of the pumping shell is sequentially provided with a pumping source, a collimating lens and a focusing lens from left to right, the pump source is adhered to the center of the inner wall of the left side of the pump shell, the collimating lens and the focusing lens are respectively connected to the right side of the pump source through a positioning piece, the laser crystal of trapezium structure has been nested in the inner chamber left side of crystal casing, the right-hand member of laser crystal has the saturable absorber of triangle-shaped structure through the high temperature bonding, and this device structure is simple relatively, simple operation when adjusting the pulse width, and the pulse width adjustable range is enough big.

Description

Pulse width adjustable solid laser

Technical Field

The utility model relates to a laser instrument technical field specifically is an adjustable solid laser of pulsewidth.

Background

With the rapid development of science and technology, lasers are increasingly used in various fields: such as industrial processing, scientific and technological research and development, medical cosmetology, laser storage, laser display, laser radar and the like, along with the development of various industries, increasingly high requirements are provided for performance parameters, reliability and stability, convenience in operation, compact structure, portability and the like of a laser.

For example, a diode pump passive Q-switched laser device of chinese utility model application No. CN201520271405.9 includes a laser diode, an optical fiber, a coupler, a convex lens group, a first laser crystal, a second laser crystal and a reflector, and the laser emitted by the laser diode reaches the convex lens group after passing through the optical fiber and the coupler.

However, the existing device has the problems of complex structure, complex operation when adjusting the pulse width and insufficient adjustable range of the pulse width.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an adjustable solid laser of pulse width to the structure that proposes in solving above-mentioned background art is complicated, and the operation is complicated when adjusting the pulse width, and the not big problem of pulse width adjustable range.

In order to achieve the above object, the utility model provides a following technical scheme: a pulse width adjustable solid laser comprises a pumping shell and a crystal shell positioned on the right side of the pumping shell, the back side wall of the crystal shell is movably connected with a guide rail through a mechanical part, the top of the crystal shell is connected with the output end of a stepping motor, the inner cavity of the pumping shell is sequentially provided with a pumping source, a collimating lens and a focusing lens from left to right, the pump source is adhered to the center of the inner wall of the left side of the pump shell, the collimating lens and the focusing lens are respectively connected to the right side of the pump source through a positioning piece, the left side of the inner cavity of the crystal shell is nested with a laser crystal with a trapezoidal structure, the right end of the laser crystal is bonded with a saturable absorber with a triangular structure through high temperature, the laser crystal and the saturable absorber form a bond and a crystal, the left end of the laser crystal is plated with an antireflection film, and the right end of the saturable absorber is plated with a reflecting film.

Preferably, centers of the pump source, the collimating lens and the focusing lens are located on the same straight line.

Preferably, the pump source is a semiconductor laser with an output wavelength of 808 nm.

Preferably, the outer wall of the left side of the pumping shell is connected with a connecting piece, and a connecting hole is formed in the body of the connecting piece.

Preferably, the laser crystal is a trapezoidal structure laser crystal with an included angle of 60-75 degrees between the right end and the horizontal plane, and the included angle between the left end of the saturable absorber and the horizontal plane is the same as the right end of the laser crystal.

Preferably, the contact position of the right end of the pumping shell and the left end of the crystal shell is connected with a chromium plating ring.

Compared with the prior art, the beneficial effects of the utility model are that:

1) the laser crystal and the saturable absorber are adopted as main structures for changing the pulse width, the structure is simple, and faults are easy to check;

2) the relative height of the pumping shell and the crystal shell can be relatively changed by adjusting the height of the crystal shell through the stepping motor, the pulse width can be changed, and the operation is simple;

3) the range of the path length of the laser passing through the saturable absorber determines the adjustment range of the pulse width, and is larger than the adjustable pulse width range of the existing laser;

4) the coating films at the two ends of the bonded crystal form two cavity mirrors of the laser, the laser with the structure can directly emit light without debugging, and the phenomenon that the output of the laser is influenced by slight change of the angles of the cavity mirrors of the laser with other mechanisms can not occur, so that the laser has stable and reliable performance, omits the cavity mirror, and has more compact structure and lower cost.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a sectional view of the present invention;

fig. 3 is a cross-sectional view of the present invention when performing pulse width modulation.

In the figure: the device comprises a pump shell 1, a crystal shell 2, a guide rail 3, a stepping motor 4, a pump source 5, a collimating lens 6, a focusing lens 7, a laser crystal 8, a saturable absorber 9, a antireflection film 10, a reflecting film 11, a connecting piece 12 and a chrome-plated ring 13.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Example (b):

referring to fig. 1-3, the present invention provides a technical solution: the utility model provides an adjustable solid laser of pulsewidth, includes pumping casing 1 and the crystal casing 2 that is located pumping casing 1 right side, and the back lateral wall of crystal casing 2 has guide rail 3 through mechanical part swing joint, and the top of crystal casing 2 is connected with step motor 4's output, and step motor 4 can control crystal casing 2 along 3 directions of guide rail with small step displacement to steadily adjust the pulsewidth, above-mentioned part constitutes the structural framework of whole device.

The inner cavity of the pumping shell 1 is sequentially provided with a pumping source 5, a collimating lens 6 and a focusing lens 7 from left to right, the pumping source 5 is adhered to the center of the inner wall of the left side of the pumping shell 1, the collimating lens 6 and the focusing lens 7 are respectively connected to the right side of the pumping source 5 through positioning pieces, and laser emitted by the pumping source 5 passes through the collimating lens6 and a focusing lens 7 are focused and then enter the crystal shell 2, the left side of the inner cavity of the crystal shell 2 is nested with a laser crystal 8 with a trapezoidal structure, and the laser crystal 8 can be Nd: YAG, Nd: YVO₄Or Nd: GdVO₄YAG saturated absorber, laser crystal 8 and saturated absorber 9 form the key and crystal, the left end of the laser crystal 8 plates and subtracts the reflection film 10, subtract the reflection to the pump light, highly reflect to the oscillating light, the right end of the saturated absorber 9 plates and reflects to the oscillating light part, the coating film of the bonding crystal both ends forms two cavity mirrors of the laser, make the laser of this structure need not to debug and can direct the light-emitting, omit the cavity mirror at the same time, make the laser that is shot stable, the above-mentioned part forms the complete laser channel.

The centers of the pump source 5, the collimating lens 6 and the focusing lens 7 are located on the same straight line, so that the light emitted by the pump source 5 can stably enter the crystal shell 2.

The pumping source 5 is a semiconductor laser with an output wavelength of 808nm, the output mode can be free space output or optical fiber coupling output, and the output laser is stable.

The outer wall of the left side of the pumping shell 1 is connected with a connecting piece 12, the body of the connecting piece 12 is provided with a connecting hole, and the pumping shell 1 can be stably fixed through the connecting piece 12.

The laser crystal 8 is a trapezoidal structure laser crystal with an included angle of 60-75 degrees between the right end and the horizontal plane, and the included angle between the left end of the saturable absorber 9 and the horizontal plane is the same as the right end of the laser crystal 8, so that the length of the cross section of the laser crystal 8 is enough to adjust the laser pulse width.

The contact position of the right end of the pumping shell 1 and the left end of the crystal shell 2 is connected with a chromium plating ring 13, so that the obstruction of the pumping shell 1 in the adjustment of the crystal shell 2 is avoided.

The working principle is as follows: the pumping shell 1 is fixed by a connecting piece 12, the whole device is connected with an external power supply, a pumping light source 5 is started, laser emitted by the pumping light source 5 is incident into the crystal shell 2 through a collimating lens 6 and a focusing lens 7, the process of passing through the crystal case 2 is divided into two parts, and when no adjustment is performed, the laser beam is emitted through a b path composed of a b1 part located in the laser crystal 8 and a b2 part located in the saturable absorber 9 on the same horizontal line, when the pulse width needs to be adjusted, the crystal shell 2 can be controlled by the stepping motor 4 to move in a micro-step along the direction of the guide rail 3, so that the incident light passes through the path of the light path which is a1+ a2 or c1+ c2, the lengths of the saturable absorbers 9 are different, the initial transmittance is smaller corresponding to different initial transmittances of the saturable absorber, the output pulse width of the system is smaller, and therefore the laser pulse width is efficiently adjusted.

Having shown and described the basic principles and principal features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an adjustable solid laser of pulse width, includes pumping casing (1) and crystal casing (2) that are located pumping casing (1) right side which characterized in that: the rear side wall of the crystal shell (2) is movably connected with a guide rail (3) through a mechanical part, the top of the crystal shell (2) is connected with the output end of a stepping motor (4), the inner cavity of the pump shell (1) is sequentially provided with a pump source (5), a collimating lens (6) and a focusing lens (7) from left to right, the pump source (5) is bonded at the center of the inner wall of the left side of the pump shell (1), the collimating lens (6) and the focusing lens (7) are respectively connected to the right side of the pump source (5) through positioning parts, the laser crystal (8) with a trapezoidal structure is nested on the left side of the inner cavity of the crystal shell (2), the right end of the laser crystal (8) is bonded with a saturated absorber (9) with a triangular structure through high temperature, the laser crystal (8) and the saturated absorber (9) form a key and a crystal, the left end of the laser crystal (8) is, the right end of the saturable absorber (9) is plated with a reflecting film (11).

2. A pulse width tunable solid state laser as claimed in claim 1, wherein: the centers of the pumping source (5), the collimating lens (6) and the focusing lens (7) are positioned on the same straight line.

3. A pulse width tunable solid state laser as claimed in claim 1, wherein: the pumping source (5) is a semiconductor laser with an output wavelength of 808 nm.

4. A pulse width tunable solid state laser as claimed in claim 1, wherein: the pump casing (1) is characterized in that the outer wall of the left side of the pump casing is connected with a connecting piece (12), and a connecting hole is formed in the body of the connecting piece (12).

5. A pulse width tunable solid state laser as claimed in claim 1, wherein: the laser crystal (8) is a trapezoidal structure laser crystal with an included angle of 60-75 degrees between the right end and the horizontal plane, and the included angle between the left end of the saturable absorber (9) and the horizontal plane is the same as the right end of the laser crystal (8).

6. A pulse width tunable solid state laser as claimed in claim 1, wherein: and a chrome plating ring (13) is connected to the contact position of the right end of the pumping shell (1) and the left end of the crystal shell (2).