Ultraviolet nanosecond laser light path structure and ultraviolet nanosecond laser module

Abstract

The invention relates to the technical field of laser, and discloses an ultraviolet nanosecond laser light path structure and an ultraviolet nanosecond laser module, the ultraviolet nanosecond laser light path structure disclosed by the invention sequentially comprises a pump light source, a first reflecting lens, an endoscope, a gain crystal, a Q crystal, a second reflecting lens, a frequency tripling crystal, a frequency doubling crystal and a third reflecting lens. The invention discloses an ultraviolet nanosecond laser module which comprises an ultraviolet nanosecond laser light path structure and further comprises a machine shell, a first radiator, a second radiator, a first electric control module and a second electric control module. The ultraviolet nanosecond laser light path structure is provided with a first reflecting lens and a second reflecting lens to form a Z-shaped light path structure, so that the size of the ultraviolet nanosecond laser light path structure is reduced, and the size of the ultraviolet nanosecond laser module is compressed through the scheme that the ultraviolet nanosecond laser light path structure with the reduced size is used and the electric control module adopts a split plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser technology, in particular to an ultraviolet nanosecond laser optical path structure and an ultraviolet nanosecond laser module. BACKGROUND

[0002] In the prior art, ultraviolet nanosecond lasers are mainly divided into two technical solutions of water-cooled heat dissipation and air-cooled heat dissipation. For the ultraviolet nanosecond laser of the water-cooled heat dissipation mode, although the laser output part can optimize the optical path to achieve the purpose of miniaturization, but in the process of use, a water tank circulating coolant is needed to assist heat dissipation. This reduces the portability of operation in application, especially in the past two years, the ultraviolet nanosecond consumer market has emerged, which is almost not a best choice. The air-cooled laser does not need a water tank for heat dissipation, and can be integrated as an integrated solution, which is currently the first choice for consumer integrated laser modules. However, the current prior art needs to consider heat dissipation and the optical path design of the V-shaped cavity which is commonly used, and most of the LD pumping modules are installed outside the cavity, resulting in a relatively large size and volume, which brings the problems of low integration, large volume of the whole machine and the situation that the consumer group cannot accept in the consumer market.

[0003] At the same time, although the prior art can ensure that the light beam is in the center of the lens barrel by adjusting the beam expander during production and debugging, it cannot guarantee the position relationship of the light beam relative to the position of the laser machine mounting foot. Especially for some fast plug-in integration requirements, it is necessary to ensure that the light beam is in the center of the beam expander at the same time, and the position relationship of the light beam relative to the positioning pin hole is unchanged or within the allowable tolerance range. SUMMARY

[0004] The present application aims to improve at least one technical problem in the background art.

[0005] The first aspect of the present application provides an ultraviolet nanosecond laser optical path structure, which comprises, in sequence, a pumping light source, a first reflecting mirror, a cavity mirror, a gain crystal, a Q crystal, a second reflecting mirror, a third harmonic crystal, a second harmonic crystal and a third reflecting mirror. The pumping light source is used to emit fiber pumping light, and the fiber pumping light emitted by the pumping light source is reflected by the first reflecting mirror, then passes through the cavity mirror, the gain crystal and the Q crystal in sequence, is reflected by the second reflecting mirror, then passes through the third harmonic crystal, the second harmonic crystal and the third reflecting mirror in sequence, and outputs ultraviolet light.

[0006] As a further improvement of the above technical solution, the ultraviolet nanosecond laser optical path structure further comprises a collimating mirror and a focusing mirror, and the collimating mirror is arranged between the pumping light source and the first reflecting mirror along the optical path direction of the fiber pumping light, and the focusing mirror is arranged between the first reflecting mirror and the cavity mirror.

[0007] The second aspect of the present application provides an ultraviolet nanosecond laser module, the ultraviolet nanosecond laser optical path structure, the ultraviolet nanosecond laser module further comprising: a shell, a first heat sink, a second heat sink, a first electric control module and a second electric control module; The ultraviolet nanosecond laser optical path structure is installed in the shell, the first heat sink and the second heat sink are fixed at the bottom of the shell, the first heat sink and the second heat sink are arranged transversely, the first heat sink is used for dissipating heat of the ultraviolet nanosecond laser optical path structure, the first electric control module is a heat-generating electric control module, the second electric control module is a non-heat-generating electric control module, the upper part of one side of the first electric control module is fixedly connected with the shell, and the lower part is fixedly connected with the second heat sink, the second electric control module is fixed on one side of the shell, the second heat sink is located between the first electric control module and the first heat sink, and the second heat sink is used for dissipating heat of the first electric control module.

[0008] As a further improvement of the above technical solution, the ultraviolet nanosecond laser module further comprises a first fan and a second fan, the first fan and the second fan are fixed on the shell respectively, the first fan is fixed on one side of the first heat sink, and the second fan is fixed on one side of the second heat sink.

[0009] As a further improvement of the above technical solution, the ultraviolet nanosecond laser module further comprises a position adjusting mechanism and a double concave lens, the position adjusting mechanism is fixed on the shell, the double concave lens is fixed on the position adjusting mechanism, the position adjusting mechanism is used for adjusting the position of the double concave lens, and the double concave lens is used for receiving ultraviolet light output by the ultraviolet nanosecond laser optical path structure and expanding the ultraviolet light.

[0010] As a further improvement of the above technical solution, the position adjusting mechanism comprises a first seat, a first screw, a second seat and a second screw; The first seat is adjustably mounted on the inner wall of the shell through the first screw, the second seat is adjustably mounted on the first seat through the second screw, the first screw is used for adjusting the vertical position of the first seat, the second screw is used for adjusting the horizontal position of the second seat, and the double concave lens is fixed on the second seat.

[0011] As a further improvement of the above technical solution, the ultraviolet nanosecond laser module further comprises a double-color lens and a red light indicator, the double-color lens and the red light indicator are fixed on the shell respectively, the red light indicator is used for emitting red light, the double-color lens is used for transmitting the ultraviolet light and reflecting the red light, so that the ultraviolet light and the red light are coincidently output.

[0012] As a further improvement of the above technical solution, the ultraviolet nanosecond laser module further comprises a convex mirror and a lens barrel, the lens barrel is fixed on the casing, and the convex mirror is installed in the lens barrel, and the lens barrel is used to adjust the distance between the convex mirror and the dichroic mirror.

[0013] The present application has the following advantages: The ultraviolet nanosecond laser optical path structure provided by the present application has the following advantages: in the optical path design, two reflecting mirrors are arranged, the fiber pump light passes through the first reflecting mirror to complete the first folding of the optical path, then passes through the focusing mirror, the cavity mirror, the gain crystal and the Q crystal in turn, and then passes through the second reflecting mirror to complete the second folding of the optical path, so that a Z-shaped cavity optical path is obtained, the fundamental frequency light passes through the second folding, then passes through the third harmonic crystal, the second harmonic crystal and the third reflecting mirror in turn, and then is combined to output 355nm ultraviolet light, so that the volume of the ultraviolet nanosecond laser optical path structure is reduced, and the design of the ultraviolet nanosecond laser module structure using air cooling is facilitated.

[0014] The ultraviolet nanosecond laser module provided by the present application has the following advantages: the ultraviolet nanosecond laser optical path structure is used, the electric control module adopts a split board scheme, the electric control module which needs to be cooled is cooled by the second heat sink, and the electric control module which does not generate heat is designed and installed on the side of the casing, so that the volume of the ultraviolet nanosecond laser module is compressed. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which: Fig. 1 It is an explosion diagram of the ultraviolet nanosecond laser module embodiment of the present application; Fig. 2 It is an explosion diagram of part of the structure of the ultraviolet nanosecond laser module embodiment of the present application; Fig. 3 It is an isometric view of the ultraviolet nanosecond laser module embodiment of the present application.

[0016] In the drawings: 1-casing;21-first heat sink;22-second heat sink;31-first electric control module;32-second electric control module;4-first seat;41-first screw;5-second seat;51-second screw;6-dichroic mirror;7-red light indicator;8-lens barrel. DETAILED DESCRIPTION

[0017] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0018] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.Figs. 1 to 3 Embodiments of the present application are described.

[0019] The embodiment relates to an ultraviolet nanosecond laser light path structure, which sequentially comprises a pump light source, a first reflecting mirror, a cavity mirror, a gain crystal, a Q crystal, a second reflecting mirror, a third harmonic generation crystal, a second harmonic generation crystal and a third reflecting mirror. The pump light source is used for emitting fiber pump light, the fiber pump light emitted by the pump light source is reflected by the first reflecting mirror, then sequentially passes through the cavity mirror, the gain crystal and the Q crystal, is reflected by the second reflecting mirror, then sequentially passes through the third harmonic generation crystal, the second harmonic generation crystal and the third reflecting mirror, and ultraviolet light is output.

[0020] In the embodiment, two reflecting mirrors are arranged in the light path design, the fiber pump light passes through the first reflecting mirror to complete the first folding of the light path, then sequentially passes through a focusing mirror, the cavity mirror, the gain crystal and the Q crystal, and passes through the second reflecting mirror to complete the second folding of the light path, so that a Z-shaped cavity light path is obtained, the fundamental light passes through the second folding, then sequentially passes through the third harmonic generation crystal, the second harmonic generation crystal and the third reflecting mirror, is combined and output as 355nm ultraviolet light, so that the volume of the ultraviolet nanosecond laser light path structure is reduced, and the design of the ultraviolet nanosecond laser module structure using air cooling is facilitated. Specifically, the pump light source is used for emitting fiber pump light, the fiber pump light is first reflected by the first reflecting mirror, then enters a laser resonant cavity, and sequentially passes through the cavity mirror, the gain crystal and the Q crystal, the gain crystal is used for stimulated emission amplification of the pump light, and the Q crystal is used for modulation of the loss in the resonant cavity, so that nanosecond pulse laser is formed, the modulated laser beam is reflected by the second reflecting mirror, then sequentially enters the third harmonic generation crystal and the second harmonic generation crystal for nonlinear frequency conversion, is reflected by the third reflecting mirror, and finally ultraviolet band laser is output.

[0021] In some embodiments, the ultraviolet nanosecond laser light path structure further comprises a collimating mirror and a focusing mirror, the collimating mirror is arranged between the pump light source and the first reflecting mirror along the light path direction of the fiber pump light, and the focusing mirror is arranged between the first reflecting mirror and the cavity mirror.

[0022] In the embodiment, the collimating mirror and the focusing mirror are arranged, the beam quality and the coupling efficiency of the pump light are improved, the pump energy is more effectively injected into the gain crystal, and therefore the laser output stability and the conversion efficiency are improved. Specifically, the collimating mirror is arranged between the pump light source and the first reflecting mirror along the light path direction of the fiber pump light, and is used for collimating the fiber pump light, and the focusing mirror is arranged between the first reflecting mirror and the cavity mirror, and is used for focusing the collimated fiber pump light to the cavity mirror.

[0023] Reference Fig. 1 andFig. 3 The embodiment relates to an ultraviolet nanosecond laser module, comprising the ultraviolet nanosecond laser optical path structure, and the ultraviolet nanosecond laser module further comprises a shell 1, a first radiator 21, a second radiator 22, a first electric control module 31 and a second electric control module 32. The ultraviolet nanosecond laser optical path structure is installed in the shell 1, the first radiator 21 and the second radiator 22 are fixed at the bottom of the shell 1, the first radiator 21 and the second radiator 22 are arranged transversely, the first radiator 21 is used for radiating the ultraviolet nanosecond laser optical path structure, the first electric control module 31 is a heat-generating electric control module, the second electric control module 32 is a non-heat-generating electric control module, the upper part of one side surface of the first electric control module 31 is fixedly connected with the shell 1, the lower part is fixedly connected with the second radiator 22, the second electric control module 32 is fixed on one side surface of the shell 1, and the second radiator 22 is located between the first electric control module 31 and the first radiator 21, and the second radiator 22 is used for radiating the first electric control module 31.

[0024] In the embodiment, the electric control module adopts a split plate scheme, the electric control module needing to be radiated is radiated through the second radiator 22, the electric control module not generating heat is designed to be installed on the side surface of the shell 1, so that the volume of the ultraviolet nanosecond laser module is compressed. Specifically, the ultraviolet nanosecond laser optical path structure is installed in the shell 1, the laser optical path structure is radiated through the first radiator 21, and the electric control module needing to be radiated is radiated through the second radiator 22.

[0025] In some embodiments, the ultraviolet nanosecond laser module further comprises a first fan and a second fan, the first fan and the second fan are fixed on the shell 1 respectively, the first fan is fixed on one side of the first radiator 21, and the second fan is fixed on one side of the second radiator 22.

[0026] In the embodiment, the first fan and the second fan are further arranged, the heat dissipation efficiency is improved through cooperation of the fans and the radiators, the temperature of the laser module can be kept stable under the conditions of high power or long time work, and the system operation stability is improved. Specifically, the first fan is fixed on one side of the first radiator 21 and is used for forcibly air cooling the ultraviolet nanosecond laser optical path structure, and the second fan is fixed on one side of the second radiator 22 and is used for enhancing the heat dissipation effect of the first electric control module 31.

[0027] Reference Fig. 2In some embodiments, the ultraviolet nanosecond laser module further comprises a position adjusting mechanism fixed on the casing 1 and a double-concave lens fixed on the position adjusting mechanism, the position adjusting mechanism is used to adjust the position of the double-concave lens, and the double-concave lens is used to receive the ultraviolet light output by the ultraviolet nanosecond laser light path structure and expand the beam of the ultraviolet light.

[0028] In this embodiment, the double-concave lens is used to expand the beam of the ultraviolet light, and the position of the double-concave lens is adjusted by the adjusting mechanism. The position of the double-concave lens can be adjusted to change the output direction of the light path, which can improve the spot size and divergence angle of the output light beam and improve the applicability of the laser in subsequent processing or detection applications.

[0029] Reference Fig. 2 In some embodiments, the position adjusting mechanism comprises a first seat 4, a first screw 41, a second seat 5 and a second screw 51. The first seat 4 is adjustably mounted on the inner wall of the casing 1 by the first screw 41, the second seat 5 is adjustably mounted on the first seat 4 by the second screw 51, the first screw 41 is used to adjust the vertical position of the first seat 4, the second screw 51 is used to adjust the horizontal position of the second seat 5, and the double-concave lens is fixed on the second seat 5.

[0030] In this embodiment, the multi-stage adjustable structure is provided to realize fine position adjustment of the double-concave lens in different directions, which facilitates light path alignment, improves beam shaping precision and assembly fault tolerance. Specifically, the first seat 4 is adjustably mounted on the inner wall of the casing 1 by the first screw 41, the first screw 41 is connected with the threaded hole on the inner wall of the casing 1 to enable the first seat 4 to be position-adjusted and fixed in the vertical direction, the second seat 5 is arranged on the first seat 4, the second seat 5 is adjustably connected with the first seat 4 by the second screw 51 to enable the second seat 5 to be position-adjusted and fixed in the horizontal direction, and the double-concave lens is fixed on the second seat 5 and moves synchronously with the second seat 5. By rotating the first screw 41 and the second screw 51, the position of the double-concave lens in the vertical and horizontal directions is adjusted, respectively.

[0031] Reference Fig. 2 In some embodiments, the ultraviolet nanosecond laser module further comprises a dichroic lens 6 and a red light indicator 7, the dichroic lens 6 and the red light indicator 7 are fixed on the casing 1 respectively, the red light indicator 7 is used to emit red light, and the dichroic lens 6 is used to transmit the ultraviolet light and reflect the red light, so that the ultraviolet light and the red light are output coincidentally.

[0032] In the embodiment, the invisible ultraviolet light has visible reference light by introducing the red light indicator 7 and the dichroic lens 6, so that the positioning accuracy and safety during equipment debugging and use are improved.

[0033] With reference to Figs. 1 to 3 In some embodiments, the ultraviolet nanosecond laser module further comprises a convex mirror and a lens barrel 8, the lens barrel 8 is fixed on the casing 1, the convex mirror is installed in the lens barrel 8, and the lens barrel 8 is used to adjust the distance between the convex mirror and the dichroic lens 6.

[0034] In the embodiment, the position of the convex mirror is adjusted by the lens barrel 8, so that the divergence characteristics and spot size of the output light beam can be flexibly changed, the adaptation ability of the laser module to different application scenarios is improved, the red light and the ultraviolet light emitted by the red light indicator 7 pass through the convex mirror at the same time, and the red light indicator 7 arranged can meet the requirements of light path following indication while beam expanding.

[0035] The preferred embodiments of the present application are described above, but the present disclosure is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present disclosure.

[0036] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

Claims

1. A UV nanosecond laser optical path structure, characterized in that: It includes, in sequence, a pump source, a first reflecting mirror, a cavity mirror, a gain crystal, a Q crystal, a second reflecting mirror, a third harmonic crystal, a second harmonic crystal, and a third reflecting mirror; The pump light source is used to emit fiber pump light. The fiber pump light emitted by the pump light source is reflected by the first reflective mirror, and then passes through the cavity mirror, the gain crystal and the Q crystal in sequence. It is then reflected by the second reflective mirror, and then passes through the third harmonic crystal, the second harmonic crystal and the third reflective mirror in sequence to output ultraviolet light.

2. The ultraviolet nanosecond laser optical path structure according to claim 1, characterized in that: The ultraviolet nanosecond laser optical path structure also includes a collimating lens and a focusing lens. Along the optical path direction of the fiber pump light, the collimating lens is disposed between the pump source and the first reflecting lens, and the focusing lens is disposed between the first reflecting lens and the cavity mirror.

3. An ultraviolet nanosecond laser module, characterized in that, The ultraviolet nanosecond laser optical path structure as described in claim 1 is further comprising: a housing (1), a first heat sink (21), a second heat sink (22), a first electronic control module (31), and a second electronic control module (32). The ultraviolet nanosecond laser optical path structure is installed inside the housing (1). The first heat sink (21) and the second heat sink (22) are fixed to the bottom of the housing (1). The first heat sink (21) and the second heat sink (22) are arranged horizontally. The first heat sink (21) is used to dissipate heat from the ultraviolet nanosecond laser optical path structure. The first electronic control module (31) is an electronic control module that generates heat. The second electronic control module (32) is an electronic control module that does not generate heat. The upper part of one side of the first electronic control module (31) is fixedly connected to the housing (1), and the lower part is fixedly connected to the second heat sink (22). The second electronic control module (32) is fixed to one side of the housing (1). The second heat sink (22) is located between the first electronic control module (31) and the first heat sink (21). The second heat sink (22) is used to dissipate heat from the first electronic control module (31).

4. The ultraviolet nanosecond laser module according to claim 3, characterized in that: The ultraviolet nanosecond laser module also includes a first fan and a second fan. The first fan and the second fan are respectively fixed on the housing (1). The first fan is fixed on one side of the first heat sink (21), and the second fan is fixed on one side of the second heat sink (22).

5. The ultraviolet nanosecond laser module according to claim 3, characterized in that: The ultraviolet nanosecond laser module also includes a position adjustment mechanism and a biconcave lens. The position adjustment mechanism is fixed on the housing (1), and the biconcave lens is fixed on the position adjustment mechanism. The position adjustment mechanism is used to adjust the position of the biconcave lens. The biconcave lens is used to receive the ultraviolet light output by the ultraviolet nanosecond laser optical path structure and expand the ultraviolet light beam.

6. The ultraviolet nanosecond laser module according to claim 5, characterized in that: The position adjustment mechanism includes a first seat (4), a first screw (41), a second seat (5), and a second screw (51); The first base (4) is adjustablely mounted on the inner wall of the housing (1) by a first screw (41), and the second base (5) is adjustablely mounted on the first base (4) by a second screw (51). The first screw (41) is used to adjust the vertical position of the first base (4), and the second screw (51) is used to adjust the horizontal position of the second base (5). The biconcave lens is fixed on the second base (5).

7. The ultraviolet nanosecond laser module according to claim 3, characterized in that: The ultraviolet nanosecond laser module also includes a dual-color lens (6) and a red light indicator (7). The dual-color lens (6) and the red light indicator (7) are respectively fixed on the housing (1). The red light indicator (7) is used to emit red light, and the dual-color lens (6) is used to transmit the ultraviolet light and reflect the red light, so that the ultraviolet light and the red light are output in coincidence.

8. The ultraviolet nanosecond laser module according to claim 7, characterized in that: The ultraviolet nanosecond laser module also includes a convex lens and a lens barrel (8). The lens barrel (8) is fixed on the housing (1). The convex lens is installed inside the lens barrel (8). The lens barrel (8) is used to adjust the distance between the convex lens and the dichroic lens (6).

Images