Laser frequency doubling unit

Abstract

The utility model discloses a laser frequency doubling unit, which comprises a frequency doubling crystal, a first adjusting mechanism, a first PB prism and a second PB prism, the frequency doubling crystal is suitable for receiving fundamental frequency light, and the first adjusting mechanism is connected with the frequency doubling crystal and is suitable for adjusting the incident angle of the frequency doubling crystal and the fundamental frequency light. The first PB prism receives laser from the frequency doubling crystal and divides the laser into frequency doubling light and fundamental frequency light which form a certain included angle, and the second PB prism receives the fundamental frequency light and the frequency doubling light and divides the fundamental frequency light and the frequency doubling light. According to the invention, frequency doubling of laser with multiple wavelengths can be realized without replacing the frequency doubling crystal.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser optics and relates to a laser frequency doubling unit. Background Art

[0002] Frequency doubling crystals can convert infrared lasers into visible lasers, or convert visible lasers into lasers with shorter wavelengths, thereby expanding the range of laser spectrum coverage. They have been widely used in laser technology. To obtain lasers with shorter wavelengths, multi-level frequency doubling can be used. There are many types of frequency doubling crystals, and they can achieve a fairly high frequency doubling conversion efficiency. For visible and near-infrared fundamental frequency light, commonly used frequency doubling crystals include KDP, KDPADP, LiIO, CDA, etc., and the conversion efficiency can be as high as 30% to 50%. For mid-infrared fundamental frequency light, commonly used crystals are AgAsS, GdGeAs, Te, CdSe, etc., and the conversion efficiency is about 5% to 15%.

[0003] At present, when using frequency doubling crystals, the laser is usually hit vertically on the frequency doubling crystal, and can only double the frequency of a single wavelength. For example, a wavelength of 1064nm becomes a wavelength of 532nm after passing through the frequency doubling crystal. If a 532nm laser is to be doubled to 266nm, the frequency doubling crystal needs to be replaced. Utility Model Content

[0004] The utility model aims to provide a laser frequency doubling unit, which can realize frequency doubling of lasers with multiple wavelengths without replacing the frequency doubling crystal.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A laser frequency doubling unit comprises a frequency doubling crystal, a first adjustment mechanism, a first PB prism and a second PB prism, wherein the frequency doubling crystal is suitable for receiving fundamental frequency light, the first adjustment mechanism is connected to the frequency doubling crystal and is suitable for adjusting the incident angle between the frequency doubling crystal and the fundamental frequency light, the first PB prism receives laser light from the frequency doubling crystal and divides it into frequency doubling light and the fundamental frequency light at a certain angle, and the second PB prism receives the fundamental frequency light and the frequency doubling light and diverts the two.

[0007] Furthermore, the first regulating mechanism comprises a worm gear mechanism, and a turbine of the worm gear mechanism is connected to the frequency doubling crystal.

[0008] Furthermore, the first adjusting mechanism further comprises a bevel gear transmission mechanism, and the bevel gear transmission mechanism is suitable for driving the worm of the worm gear mechanism.

[0009] Furthermore, the bevel gear transmission mechanism is connected to a drive motor.

[0010] Furthermore, it also includes a second adjustment mechanism and a third adjustment mechanism, the second adjustment mechanism is suitable for driving the first PB prism to rotate so as to adjust the angle between itself and the incident light; the third adjustment mechanism is suitable for driving the second PB prism to move and rotate in a straight line so that the second PB prism can separate the doubled frequency light and the fundamental frequency light.

[0011] Furthermore, it also includes a reversing reflector assembly, which is suitable for receiving the doubled frequency light from the second PB prism and adjusting it to a preset position.

[0012] Furthermore, the reversing reflector assembly includes a plurality of adjustable isosceles right-angle prisms.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The laser frequency doubling unit of the utility model comprises a frequency doubling crystal, a first adjustment mechanism, a first PB prism and a second PB prism. Fundamental frequency lights of different wavelengths will generate frequency doubling lights when passing through the frequency doubling crystals of corresponding incident angles. The first adjustment mechanism can be adjusted to drive the rotating frequency doubling crystal to change the incident angle. After the fundamental frequency light passes through the frequency doubling crystal, the fundamental frequency light and the generated frequency doubling light are overlapped. After entering the first PB prism, due to the difference in wavelengths between the fundamental frequency light and the frequency doubling light, the fundamental frequency light and the frequency doubling light refracted from the first PB prism present a certain angle. When the second PB prism receives the fundamental frequency light and the frequency doubling light, the rough surface of the second PB prism is aligned with the fundamental frequency light. The fundamental frequency light is diffusely reflected and eliminated, while the frequency doubling light is retained through the second PB prism and the propagation direction of the frequency doubling light is changed under the action of the second PB prism. Therefore, without replacing the frequency doubling crystal, frequency doubling of lasers of multiple wavelengths can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work, including:

[0016] Figure 1 This is a schematic structural diagram of a laser frequency doubling unit according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the diversion of fundamental frequency light in an embodiment of the utility model.

[0018] Markings in the figure:

[0019] 100- fundamental frequency light;

[0020] 10-fold frequency crystal;

[0021] 20- first adjustment mechanism;

[0022] 30- first PB prism;

[0023] 40 - second PB prism;

[0024] 50- second adjustment mechanism;

[0025] 60- third regulating mechanism;

[0026] 70-Isosceles right angle prism

[0027] 200-fold frequency light. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0030] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0031] As described in the background technology, when using a frequency doubling crystal, the laser is usually vertically projected onto the frequency doubling crystal, and can only double a single wavelength. For example, a wavelength of 1064nm becomes 532nm after passing through the frequency doubling crystal. If a 532nm laser is to be doubled to 266nm, the frequency doubling crystal needs to be replaced.

[0032] Based on this, the inventors have created a laser frequency doubling unit of the present application to solve the above technical problems.

[0033] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0034] Example

[0035] See also Figure 1 , Figure 2 A laser frequency doubling unit includes a frequency doubling crystal 10, a first adjustment mechanism 20, a first PB prism 30 and a second PB prism 40, wherein the frequency doubling crystal 10 is suitable for receiving a fundamental frequency light 100. Here, the fundamental frequency light 100 refers to the incident light, and the frequency doubling light 200 is frequency doubling after the frequency doubling crystal 10, so that the wavelength is different from the fundamental frequency light 100. Here, in the present application, for a frequency doubling crystal 10, the wavelength of the fundamental frequency light 100 that can be frequency doubling can be frequency doubling within a certain range. The first adjustment mechanism 20 is connected to the frequency doubling crystal 10 and is suitable for adjusting the incident angle between the frequency doubling crystal 10 and the fundamental frequency light 100, the first PB prism 30 receives the laser from the frequency doubling crystal 10 and divides it into the frequency doubling light 200 and the fundamental frequency light 100 presenting a certain angle, and the second PB prism 40 receives the fundamental frequency light 100 and the frequency doubling light 200 and divides the two. It should be noted here that the “certain angle” here is very small, which is caused by the different refractions of the fundamental frequency light 100 and the frequency doubled light 200 in the first PB prism 30 due to the different wavelengths. The fundamental frequency light 100 and the frequency doubled light 200 can be completely separated by the second PB prism 40 afterwards.

[0036] The laser frequency doubling unit of the utility model comprises a frequency doubling crystal 10, a first adjustment mechanism 20, a first PB prism 30 and a second PB prism 40. The fundamental frequency light 100 of different wavelengths will generate the frequency doubling light 200 only when it passes through the frequency doubling crystal 10 with the corresponding incident angle. The first adjustment mechanism 20 can be adjusted to drive the rotating frequency doubling crystal 10 to change the incident angle. After the fundamental frequency light 100 passes through the frequency doubling crystal 10, the fundamental frequency light 100 and the generated frequency doubling light 200 are overlapped. After entering the first PB prism 30, due to the fundamental frequency light 100 and the frequency doubling light 20 Due to the difference in wavelengths, the fundamental frequency light 100 and the doubled frequency light 200 refracted from the first PB prism 30 present a certain angle. When the second PB prism 40 receives the fundamental frequency light 100 and the doubled frequency light 200, the rough surface of the second PB prism 40 is aligned with the fundamental frequency light 100. The fundamental frequency light 100 is diffusely reflected and eliminated, while the doubled frequency light 200 is retained through the second PB prism 40. The propagation direction of the doubled frequency light 200 is changed under the action of the second PB prism 40. Therefore, without replacing the doubled frequency crystal 10, it is possible to achieve doubled frequency of lasers with multiple wavelengths.

[0037] In another embodiment, the first adjustment mechanism 20 includes a worm gear mechanism, and the turbine of the worm gear mechanism is connected to the frequency doubling crystal 10. The worm gear allows the angle of the frequency doubling crystal 10 of the output shaft to be self-locking. Preferably, the first adjustment mechanism 20 also includes a bevel gear transmission mechanism, and the bevel gear transmission mechanism is suitable for driving the worm of the worm gear mechanism. The setting of the bevel gear transmission mechanism improves the reduction ratio, the output shaft resolution is higher, the bevel gear transmission is smooth, and the clearance of ordinary spur gear operation is eliminated, and the transmission accuracy is higher. Preferably, the bevel gear transmission mechanism is connected to a drive motor. In this way, the frequency doubling crystal 10 is driven to rotate by the drive motor, avoiding external factors interfering with the angle deviation of the frequency doubling crystal 10.

[0038] In another embodiment, the laser frequency doubling unit further includes a second adjustment mechanism 50 and a third adjustment mechanism 60, wherein the second adjustment mechanism 50 is adapted to drive the first PB prism 30 to rotate so as to adjust the angle between the second adjustment mechanism 50 and the incident light; and the third adjustment mechanism 60 is adapted to drive the second PB prism 40 to move and rotate along a straight line so as to make the second PB prism 40 shunt the frequency doubling light 200 and the fundamental frequency light 100. With such a configuration, the position adjustment of the first PB prism 30 and the second PB prism 40 is more convenient, thereby improving the frequency doubling efficiency.

[0039] In another embodiment, the laser frequency doubling unit further includes a reversing reflector assembly, which is adapted to receive the frequency-doubled light 200 from the second PB prism 40 and adjust it to a preset position. By setting the reversing reflector assembly, the frequency-doubled light 200 can be adjusted to a preset position to meet actual needs. Preferably, the reversing reflector assembly includes a plurality of adjustable isosceles right-angle prisms 70.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laser frequency doubling unit, characterized in that: The invention comprises a frequency doubling crystal, a first adjusting mechanism, a first PB prism and a second PB prism. The frequency doubling crystal is suitable for receiving fundamental frequency light. The first adjusting mechanism is connected to the frequency doubling crystal and is suitable for adjusting the incident angle between the frequency doubling crystal and the fundamental frequency light. The first PB prism receives the laser from the frequency doubling crystal and divides it into the frequency doubling light and the fundamental frequency light with a certain angle. The second PB prism receives the fundamental frequency light and the frequency doubling light and diverts the two.

2. A laser frequency doubling unit according to claim 1, characterized in that: The first adjustment mechanism comprises a worm gear mechanism, and a turbine of the worm gear mechanism is connected to the frequency doubling crystal.

3. A laser frequency doubling unit according to claim 2, characterized in that: The first adjustment mechanism further comprises a bevel gear transmission mechanism, and the bevel gear transmission mechanism is suitable for driving the worm of the worm gear mechanism.

4. A laser frequency doubling unit according to claim 3, characterized in that: The bevel gear transmission mechanism is connected with a driving motor.

5. A laser frequency doubling unit according to claim 1, characterized in that: It also includes a second adjustment mechanism and a third adjustment mechanism. The second adjustment mechanism is suitable for driving the first PB prism to rotate so as to adjust the angle between itself and the incident light; the third adjustment mechanism is suitable for driving the second PB prism to move and rotate in a straight line so that the second PB prism can separate the doubled frequency light and the fundamental frequency light.

6. A laser frequency doubling unit according to any one of claims 1 to 5, characterized in that: It also includes a reversing reflector assembly, which is suitable for receiving the frequency-doubled light from the second PB prism and adjusting it to a preset position.

7. A laser frequency doubling unit according to claim 6, characterized in that: The reversing reflector assembly comprises a plurality of adjustable isosceles right-angle prisms.

Images