Pump laser and electronic equipment

Abstract

The utility model relates to the technical field of laser technology, and provides a pump laser and electronic equipment. The pump laser comprises a focusing unit, a fundamental frequency optical oscillation cavity unit and a frequency doubling unit. The fundamental frequency optical oscillation cavity unit comprises a vertical external cavity surface emitting laser chip, a first cavity mirror and a second cavity mirror. The incident side of the focusing unit is used for receiving pump light, the vertical external cavity surface emitting laser chip is arranged on the emergent side of the focusing unit, the first cavity mirror is arranged on the emergent side of the vertical external cavity surface emitting laser chip, the frequency doubling unit is arranged on the emergent side of the first cavity mirror, and the second cavity mirror is arranged on the emergent side of the second cavity mirror. The second cavity mirror is arranged on the emergent side of the frequency doubling unit; wherein the focusing unit is used for focusing the pump light on the surface of the vertical external cavity surface emitting laser chip; the fundamental frequency light oscillation cavity unit is used for carrying out oscillation amplification on fluorescent light emitted by the vertical external cavity surface emitting laser chip, so that the fluorescent light forms fundamental frequency light; the first cavity mirror is used for reflecting the fluorescent light and / or the fundamental frequency light so as to emit first reflected light to the frequency doubling unit and emit second reflected light to the vertical external cavity surface emitting laser chip; the frequency doubling unit is used for carrying out frequency doubling on the first reflected light and emitting frequency-doubled laser to the second cavity mirror; the second cavity mirror is used for reflecting the frequency-doubled laser back to the first cavity mirror; the first cavity mirror is also used for outputting the frequency-doubled laser; and the vertical external cavity surface emitting laser chip is also used for emitting new fluorescent light to the first cavity mirror under the excitation of the second reflected light. Therefore, the stability of the laser output by the pump laser can be improved, and the line width and noise can be reduced.

Description

Technical Field

[0001] The present application relates to the field of laser technology, and in particular to a pump laser and electronic equipment. Background Art

[0002] With the development of laser technology, lasers have been applied to various fields, such as atmospheric monitoring and medical testing, bringing great convenience to people's work and life.

[0003] In the related art, in order to obtain the corresponding laser, the related technicians generally inject pump light into an artificial crystal, and then amplify the light emitted from the artificial crystal and make corresponding adjustments to convert the pump light into laser and emit it to the target.

[0004] However, since the light emitted by the artificial crystal in the related art solution has a poor beam quality, it is easy to cause the final laser to be unstable, with large line width and noise. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a pump laser and an electronic device.

[0006] In a first aspect, an embodiment of the present application provides a pump laser, the pump laser comprising: a focusing unit, a fundamental frequency light oscillating cavity unit, and a frequency doubling unit; the fundamental frequency light oscillating cavity unit comprises a vertical external cavity surface emitting laser chip (Vertical-External-Cavity Surface-Emitting Laser, referred to as VECSEL), a first cavity mirror and a second cavity mirror;

[0007] The incident side of the focusing unit is used to receive pump light, the VECSEL is arranged on the exit side of the focusing unit, the first cavity mirror is arranged on the exit side of the VECSEL, the frequency doubling unit is arranged on the exit side of the first cavity mirror, and the second cavity mirror is arranged on the exit side of the frequency doubling unit;

[0008] Wherein, the focusing unit is used to focus the pump light on the surface of the VECSEL;

[0009] The fundamental frequency light oscillator cavity unit is used to oscillate and amplify the fluorescence emitted by the vertical external cavity surface emitting laser chip so that the fluorescence forms fundamental frequency light; the fluorescence is generated by the vertical external cavity surface emitting laser chip under the excitation of the pump light, and the propagation direction of the fluorescence is perpendicular to the surface of the vertical external cavity surface emitting laser chip;

[0010] The first cavity mirror is used to reflect the fluorescence and / or the fundamental frequency light to emit a first reflected light to the frequency doubling unit and emit a second reflected light to the vertical external cavity surface emitting laser chip.

[0011] The frequency doubling unit is used to double the frequency of the first reflected light and emit the frequency-doubled laser to the second cavity mirror; the second cavity mirror is used to reflect the frequency-doubled laser back to the first cavity mirror;

[0012] The first cavity mirror is further used to output the frequency-doubled laser; the vertical external cavity surface emitting laser chip is further used to emit new fluorescence toward the first cavity mirror under the excitation of the second reflected light.

[0013] Optionally, the frequency doubling unit includes a frequency doubling crystal;

[0014] The optical axis of the frequency doubling crystal is coaxial with the first reflected light, and the surface of the second cavity mirror is perpendicular to the first reflected light;

[0015] The frequency doubling crystal is used to double the frequency of the first reflected light to obtain the frequency doubling laser, and emit the frequency doubling laser to the second cavity mirror.

[0016] Optionally, the first cavity mirror and the second cavity mirror are concave mirrors;

[0017] The incident surface of the first cavity mirror is provided with a first coating, and the incident surface of the second cavity mirror is provided with a second coating;

[0018] The first coating is used to reflect the fundamental frequency light and emit the frequency-doubled laser;

[0019] The second coating is used for reflecting the frequency-doubled laser.

[0020] Optionally, the pump laser further includes a laser spectrum range adjustment module;

[0021] The laser spectrum range adjustment module is arranged between the vertical external cavity surface emitting laser chip and the first cavity mirror;

[0022] The laser spectrum range adjustment module is used to screen and / or filter the fundamental frequency light, and emit the adjusted fundamental frequency light to the first cavity mirror.

[0023] Optionally, the laser spectrum range adjustment module includes a birefringent crystal;

[0024] The incident surface of the birefringent crystal and the surface of the vertical external cavity surface emitting laser chip form an included angle of a preset angle;

[0025] The birefringent crystal generates a first refracted light and a second refracted light based on birefringence characteristics and the fundamental frequency light, and directs the first refracted light or the second refracted light toward the first cavity mirror.

[0026] Optionally, the laser spectrum range adjustment module includes a frequency selection unit;

[0027] The frequency selection unit is used to direct the laser light in the fundamental frequency light whose polarization direction satisfies the optical axis of the frequency selection unit toward the first cavity mirror.

[0028] Optionally, the pump laser further comprises a pump light source;

[0029] The pump light source is arranged on the incident side of the focusing unit;

[0030] The pump light source is used to emit the pump light to the focusing unit.

[0031] Optionally, the pump laser further comprises a light splitting unit and a photodiode;

[0032] The light splitting unit is arranged on the exit side of the first cavity mirror;

[0033] The light splitting unit is used to split the frequency-doubled laser output by the first cavity mirror into a first light beam and a second light beam, and emit the first light beam to the photodiode and output the second light beam to the outside;

[0034] The photodiode generates detection electric energy based on the first light beam, and the detection electric energy is used to characterize the real-time power of the pump light source;

[0035] The light intensity of the first light beam is smaller than the light intensity of the second light beam.

[0036] Optionally, the pump laser further includes a driving module;

[0037] The driving module is connected to the photodiode and the pump light source respectively;

[0038] The driving module is used to receive the detection power output by the photodiode and adjust the current output to the pump light source according to the detection power.

[0039] In a second aspect, an embodiment of the present application further provides an electronic device, comprising any pump laser provided in the first aspect above.

[0040] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0041] The present application provides a pump laser, which comprises a focusing unit, a fundamental frequency light oscillation cavity unit, and a frequency doubling unit in the pump laser, wherein the fundamental frequency light oscillation cavity unit comprises a VECSEL, a first cavity mirror, and a second cavity mirror.

[0042] The focusing unit receives the pump light and focuses the pump light on the surface of the VECSEL, which can ensure that the pump light is irradiated onto the VECSEL as much as possible, so as to ensure the luminous efficiency of the excited VECSEL.

[0043] Due to the characteristics of VECSEL, the fluorescence emitted by VECSEL has the advantages of good beam quality, narrow line width and low noise. In addition, the fluorescence can be repeatedly oscillated and amplified in the fundamental frequency light oscillation cavity unit composed of VECSEL, the first cavity mirror and the second cavity mirror to obtain fundamental frequency light with greater light intensity, narrower line width, consistent propagation direction, and the same frequency and phase.

[0044] Furthermore, since the frequency doubling unit can also frequency double the first reflected light reflected by the first cavity mirror, it can be ensured that the wavelength of the obtained frequency-doubled laser and the laser finally emitted by the first cavity mirror is shorter.

[0045] It is understandable that, because different VECSELs can generate fluorescence of different wavelengths and frequencies under the excitation of the same pump light, the wavelength of the emitted fluorescence can be adjusted by directly replacing and adjusting the VECSEL, without the need to set up more and more complex optical adjustment components to achieve the purpose of obtaining laser of a specific wavelength.

[0046] In this way, the VECSEL can be excited by the pump light to produce high-quality fluorescence, thereby improving the stability of the laser output by the pump laser, reducing the line width and noise. In addition, the laser wavelength can be flexibly adjusted while ensuring low costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0048] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0049] Figure 1 A schematic diagram of the structure of a pump laser provided in an embodiment of the present application;

[0050] Figure 2A schematic diagram of the structure of another pump laser provided in an embodiment of the present application;

[0051] Figure 3 A schematic diagram of the structure of another pump laser provided in an embodiment of the present application;

[0052] Figure 4 A schematic diagram of the structure of another pump laser provided in an embodiment of the present application;

[0053] Figure 5 A schematic diagram of the structure of another pump laser provided in an embodiment of the present application;

[0054] Figure 6 A schematic diagram of the structure of another pump laser provided in an embodiment of the present application;

[0055] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0058] Usually, in order to obtain the corresponding laser, the relevant technicians generally inject the pump light into the artificial crystal, and then amplify and adjust the light emitted from the artificial crystal to convert the pump light into laser and emit it to the target. However, since the light emitted from the artificial crystal in the related art has poor beam quality, it is easy to cause the final laser to be unstable, with large line width and noise.

[0059] In addition, since the artificial crystal in the above scheme cannot generate a light beam of a specific wavelength after receiving the pump light, if light beams of different wavelengths are to be obtained, more and more complex components must be set up to adjust the light beam emitted from the artificial crystal. Therefore, this scheme also has the problem that the laser wavelength cannot be easily adjusted.

[0060] To this end, an embodiment of the present application provides a pump laser, which is provided with a focusing unit, a fundamental frequency light oscillation cavity unit, and a frequency doubling unit, and the fundamental frequency light oscillation cavity unit includes a vertical external cavity surface emitting laser chip, a first cavity mirror, and a second cavity mirror. Among them, the focusing unit is used to focus the pump light on the surface of the VECSEL. The fundamental frequency light oscillation cavity unit is used to oscillate and amplify the fluorescence emitted by the VECSEL under the excitation of the pump light, so that the fluorescence forms fundamental frequency light. The first cavity mirror is used to reflect the fluorescence and / or the fundamental frequency light to emit a first reflected light to the frequency doubling unit and a second reflected light to the vertical external cavity surface emitting laser chip. The frequency doubling unit is used to double the frequency of the first reflected light and emit the frequency doubling laser to the second cavity mirror. The second cavity mirror is used to reflect the frequency doubling laser back to the first cavity mirror. The first cavity mirror is also used to output the frequency doubling laser; the vertical external cavity surface emitting laser chip is also used to emit new fluorescence to the first cavity mirror under the excitation of the second reflected light. In this way, the VECSEL can be excited by pump light to produce a higher-quality fundamental frequency spectrum, thereby improving the stability of the laser and reducing the line width and noise.

[0061] The pump laser provided in the present application can be used in any possible fields such as atmospheric monitoring, medical testing, laser imaging, etc. For example, it can be used in flow cytometers. The embodiments of the present application do not limit this.

[0062] The pump laser provided in the embodiments of the present application is exemplarily described below with reference to the accompanying drawings.

[0063] In one embodiment, Figure 1 As shown, a pump laser 100 is provided. The pump laser 100 comprises: a focusing unit 101, a fundamental frequency light oscillating cavity unit, and a frequency doubling unit 102. The fundamental frequency light oscillating cavity unit comprises a VECSEL 103, a first cavity mirror 104, and a second cavity mirror 105.

[0064] The incident side of the focusing unit 101 is used to receive pump light, the VECSEL 103 is arranged on the exit side of the focusing unit 101, the first cavity mirror 104 is arranged on the exit side of the VECSEL 103, the frequency doubling unit 102 is arranged on the exit side of the first cavity mirror 104, and the second cavity mirror 105 is arranged on the exit side of the frequency doubling unit 102.

[0065] The focusing unit 101 is used to focus the pump light on the surface of the VECSEL 103 .

[0066] The fundamental frequency light oscillation cavity unit is used to oscillate and amplify the fluorescence emitted by the VECSEL 103 so that the fluorescence forms fundamental frequency light.

[0067] The VECSEL 103 is used to emit fluorescence toward the first cavity mirror 104 under the excitation of the pump light.

[0068] The first cavity mirror 104 is used to reflect the fluorescence and / or the fundamental frequency light to emit the first reflected light toward the frequency doubling unit 102 and emit the second reflected light toward the VECSEL 103 .

[0069] The frequency doubling unit 102 is used to double the frequency of the first reflected light and emit the frequency doubled laser light toward the second cavity mirror 105. The second cavity mirror 105 is used to reflect the frequency doubled laser light back to the first cavity mirror 104.

[0070] The first cavity mirror 104 is also used to output the frequency-doubled laser.

[0071] The VECSEL 103 is further configured to emit new fluorescence toward the first cavity mirror 104 under the excitation of the second reflected light.

[0072] The pump light may be light emitted by any possible device or apparatus that can elevate atoms or molecules in a laser gain medium from a lower energy level to a higher energy level. The VECSEL 103 in this embodiment may be a laser gain medium, that is, the pump light may be used to excite the VECSEL 103 to generate fluorescence.

[0073] That is, the fluorescence is generated by the VECSEL 103 under the excitation of the pump light.

[0074] The focusing unit 101 may be a lens with a focusing function, and is specifically used to collimate the pump light and focus it on the surface of the VECSEL 103 facing the focusing unit 101 .

[0075] In this embodiment, VECSEL 103 may refer to an optical vertical external cavity surface emitting laser chip. VECSEL 103 has the characteristics of good light beam quality, narrow line width and low noise.

[0076] Furthermore, the VECSEL 103 can generate and emit a corresponding photon to the first cavity mirror 104 under the excitation of each photon in the pump light. The propagation direction of the fluorescence is perpendicular to the surface of the VECSEL 103 .

[0077] Since different VECSELs 103 have different characteristics, for example, under the excitation of the same pump light, different VECSELs 103 can generate fluorescence of different wavelengths and frequencies. Therefore, when it is necessary to generate fluorescence of different frequencies or wavelengths, there is no need to replace the pump light source or make too many adjustments to the structure of the pump laser 100, and only a different VECSEL 103 needs to be replaced.

[0078] In this embodiment, the first cavity mirror 104 may be a concave mirror, and the incident surface of the first cavity mirror 104 may be provided with a first coating.

[0079] The first coating is used to reflect the fluorescence and emit the doubled frequency laser. It can be understood that in this embodiment, the first coating can greatly reflect the fluorescence, generally 90% or even 99% of the fluorescence can be reflected to generate the first reflected light and the second reflected light. At the same time, most of the doubled frequency laser can transmit the first coating and be output as laser to any other possible external device after transmitting through the first cavity mirror 104.

[0080] That is, the first reflected light and the second reflected light are both obtained by reflecting the fluorescence by the first cavity mirror 104. Generally, the ratio of the first reflected light and the second reflected light to the fluorescence can be adjusted by adjusting the angle of the first cavity mirror 104.

[0081] In this embodiment, the frequency doubling unit 102 can perform frequency doubling on at least part of the first reflected light, and frequency doubling can specifically refer to increasing the frequency of the first reflected light and reducing the wavelength of the first reflected light. For example, the frequency doubling unit 102 can directly increase the frequency of the first reflected light to twice the original frequency and change the wavelength of the first reflected light to 1 / 2 of the original frequency to obtain the frequency doubling laser.

[0082] In addition, the second cavity mirror 105 can also reflect the first reflected light that has not been doubled back to the first cavity mirror 104, and then reflected back to VECSEL103 by the first cavity mirror 104, so as to re-stimulate VECSEL103 to produce new fluorescence, so that the fluorescence repeatedly oscillates and amplifies in the fundamental frequency light oscillation cavity unit composed of VECSEL103, the first cavity mirror 104 and the second cavity mirror 105.

[0083] Exemplarily, the fundamental frequency optical oscillation cavity unit composed of VECSEL 103, the first cavity mirror 104, and the frequency doubling unit 102 may be a V-type resonant cavity.

[0084] For example, after the first cavity mirror 104 reflects back the first reflected light and the second reflected light, the second reflected light can re-excite the VECSEL 103 to emit new photons, i.e., the new fluorescence, after irradiating the VECSEL 103. At the same time, after the first reflected light enters the frequency doubling unit 102, a portion of the first reflected light that has not been frequency-doubled can also be reflected back to the VECSEL 103 through the first cavity mirror 104 to re-excite the VECSEL 103.

[0085] In this way, the fluorescence propagating in the pump laser 100 can be increased, and the amount of subsequent frequency-doubled laser light can be increased, that is, the intensity of the laser light finally output by the pump laser 100 can be improved.

[0086] That is to say, the VECSEL 103 can be excited not only by the pump light and the second reflected light, but also by a portion of the first reflected light reflected back by the first cavity mirror 104 that has not been frequency doubled.

[0087] In addition, see Figure 1 , generally speaking, Figure 1 The angle between the fluorescent light a and the first reflected light b may be about 14°, and the bisector of the angle between the fluorescent light a and the first reflected light b is perpendicular to the first cavity mirror 104, which is not limited in this embodiment of the present application.

[0088] It is worth noting that in this embodiment, by setting the focusing unit 101, the fundamental frequency light oscillation cavity unit, and the frequency doubling unit 102 in the pump laser 100, and the fundamental frequency light oscillation cavity unit includes a VECSEL 103, a first cavity mirror 104, and a second cavity mirror 105. In addition, the VECSEL 103 is set on the exit side of the focusing unit 101, the first cavity mirror 104 is set on the exit side of the VECSEL 103, the frequency doubling unit 102 is set on the exit side of the first cavity mirror 104, and the second cavity mirror 105 is set on the exit side of the frequency doubling unit 102.

[0089] The focusing unit 101 receives the pump light and focuses the pump light on the surface of the VECSEL 103 , which can ensure that the pump light is irradiated onto the VECSEL 103 as much as possible, so as to ensure the luminous efficiency of the excited VECSEL 103 .

[0090] Due to the characteristics of VECSEL103, the fluorescence emitted by VECSEL103 has the advantages of good beam quality, narrow line width and low noise, and the fluorescence can also oscillate and amplify repeatedly in the fundamental frequency light oscillation cavity unit composed of VECSEL103, the first cavity mirror 104 and the second cavity mirror 105 to obtain fundamental frequency light with greater light intensity, narrower line width, consistent propagation direction, and the same frequency and phase.

[0091] Furthermore, since the frequency doubling unit 102 can also frequency double the first reflected light reflected by the first cavity mirror 104, it can be ensured that the wavelength of the obtained frequency-doubled laser and the laser finally emitted by the first cavity mirror 104 are shorter.

[0092] It is understandable that, because different VECSEL103 can generate fluorescence of different wavelengths and frequencies under the excitation of the same pump light, the wavelength of the emitted fluorescence can be adjusted by directly replacing and adjusting VECSEL103, and the purpose of obtaining laser of a specific wavelength can be achieved without setting up more and more complex optical adjustment components.

[0093] In this way, the VECSEL 103 can be excited by the pump light to produce high-quality fluorescence, thereby achieving the effect of improving the stability of the laser output by the pump laser 100 and reducing the line width and noise. In addition, the laser wavelength can be flexibly adjusted while ensuring low cost.

[0094] For a possible implementation, see Figure 2 The frequency doubling unit 102 includes a frequency doubling crystal 1021 .

[0095] The optical axis of the frequency doubling crystal 1021 is coaxial with the first reflected light, and the surface of the second cavity mirror 105 is perpendicular to the first reflected light.

[0096] The frequency doubling crystal 1021 is used to double the frequency of the first reflected light to obtain the frequency doubled laser, and emit the frequency doubled laser to the second cavity mirror 105 .

[0097] In this embodiment, the frequency doubling crystal 1021 is a nonlinear frequency doubling crystal, for example, it may be a lithium triborate (LiB3O5, LBO for short) crystal.

[0098] For another example, if the wavelength of the fluorescence emitted by VECSEL 103 is 1064 nm, after being frequency-doubled by the frequency-doubled crystal 1021, the frequency of the obtained frequency-doubled laser becomes twice as high as the original one, and the wavelength of the frequency-doubled laser becomes 532 nm, so that the beam line width of the frequency-doubled laser becomes narrower.

[0099] In one embodiment, the second cavity mirror 105 is also a concave mirror.

[0100] Furthermore, a second coating is provided on the incident surface of the second cavity mirror 105. The second coating is used to reflect the frequency-doubled laser. In addition, if a portion of the first reflected light is not frequency-doubled, the second coating can also reflect the portion of the first reflected light that is not frequency-doubled.

[0101] It is understood that, in this embodiment, the second coating can significantly reflect the frequency-doubled laser, and generally can reflect 90% or even 99% of the frequency-doubled laser and / or the first reflected light that is not frequency-doubled back to the first cavity mirror 104.

[0102] It is worth noting that the fundamental frequency light oscillator unit composed of VECSEL 103, first cavity mirror 104, and second cavity mirror 105 can increase the fluorescence propagating in the pump laser 100, thereby increasing the amount of light of the subsequent frequency-doubled laser. In addition, the frequency-doubled laser obtained by the frequency-doubled crystal 1021 by multiplying the first reflected light also has the characteristics of high frequency and short wavelength, which can further narrow the beam line width of the frequency-doubled laser.

[0103] For a possible implementation, see Figure 3The pump laser 100 further includes a laser spectrum range adjustment module 106 .

[0104] The laser spectrum range adjustment module 106 is disposed between the VECSEL 103 and the first cavity mirror 104 .

[0105] The laser spectrum range adjustment module 106 is used to screen and / or filter the fundamental frequency light, and emit the adjusted fundamental frequency light to the first cavity mirror 104 .

[0106] In this embodiment, the wavelength range of the adjusted fundamental frequency light is smaller than the wavelength range of the fluorescence and / or the fundamental frequency light.

[0107] For example, if the wavelength range of the fundamental frequency light is 1064.1nm-1064.5nm, then after the frequency selection by the laser spectrum range adjustment module 106, the wavelength range of the adjusted fundamental frequency light may be 1064.1000001nm-1064.1000005nm.

[0108] It is worth noting that, since the laser spectrum range adjustment module 106 can screen and / or filter the fundamental frequency light, that is, the adjusted fundamental frequency light finally emitted to the first cavity mirror 104 through the laser spectrum range adjustment module 106 has a narrower line width than the fundamental frequency light oscillated and amplified by the fundamental frequency light oscillation cavity unit. In this way, the line width of the subsequent frequency-doubled laser and the finally emitted laser can be further reduced.

[0109] For a possible implementation, see Figure 4 The laser spectrum range adjustment module 106 includes a birefringent crystal 1061 .

[0110] The optical axis of the birefringent crystal 1061 and the polarization direction of the fundamental frequency light form an included angle of a preset angle.

[0111] The birefringent crystal 1061 generates a first refracted light and a second refracted light based on the birefringence characteristic and the fundamental frequency light, and directs the first refracted light or the second refracted light toward the first cavity mirror 104 .

[0112] Specifically, the birefringent crystal 1061 is inserted into the fundamental frequency optical path between the VECSEL 103 and the first cavity mirror 104 at the Brewster angle.

[0113] The birefringent crystal 1061 can generate different refraction angles for all longitudinal modes in the fundamental frequency light based on the birefringence characteristics. By adjusting the fundamental frequency light oscillation unit, the required longitudinal modes can be selected to participate in the light oscillation, and the generation of redundant longitudinal modes can be suppressed, thereby playing the role of frequency selective filtering.

[0114] In this embodiment, the preset angle can be set by relevant technical personnel according to the actual needs of frequency selection, and the embodiment of the present application is not limited to this.

[0115] In addition, the birefringence characteristic refers to the property that the birefringent crystal 1061 can refract light in different propagation directions according to the incident fundamental frequency light.

[0116] Exemplarily, by adjusting the preset angle, the propagation path of the fundamental frequency light when passing through the birefringent crystal 1061 can be changed to adjust the different refracted lights that can be diffracted, so that the diffracted light of a specific wavelength is directed to the first cavity mirror 104. In this way, the purpose of frequency selection can be achieved based on the diffraction phenomenon between the refracted lights generated by the birefringent crystal.

[0117] It should be understood that the propagation directions of the first refracted light and the second refracted light generated by the birefringent crystal 1061 refracting the fundamental frequency light must be different, and the propagation directions of the first refracted light and the second refracted light are also different from those of the fundamental frequency light. Therefore, it is necessary to adaptively adjust the position and / or direction of the first cavity mirror 104 and the second cavity mirror 105 to select the required refracted light to participate in the laser oscillation of the fundamental frequency light oscillation cavity unit, so that only one refracted light can participate in the fundamental frequency light oscillation, thereby achieving the purpose of suppressing the generation of laser light by redundant light waves to reduce the spectrum width of the laser.

[0118] For example, after the first refracted light and the second refracted light are generated, the position and / or direction of the first cavity mirror 104 can be adjusted so that the birefringent crystal 1061 directs the first refracted light toward the first cavity mirror 104, and the position and / or direction of the second cavity mirror 105 can be adjusted so that the first cavity mirror 104 directs the first refracted light vertically toward the surface of the second cavity mirror 105. Since the propagation direction of the second refracted light is different from that of the first refracted light, in this case, the second refracted light cannot be directed toward the first cavity mirror 104 and the second cavity mirror 105. In this way, it can be ensured that the first refracted light can participate in the laser oscillation of the fundamental frequency optical oscillation cavity unit, while the second refracted light does not participate in the oscillation.

[0119] It is worth noting that, since only specific refracted light can be diffracted to emit toward the first cavity mirror 104, the line width of the light finally emitted toward the first cavity mirror 104 can be optimized to be narrower. In this way, the line width of the subsequent doubled frequency laser and the finally emitted laser can be further reduced.

[0120] For a possible implementation, see Figure 5 The laser spectrum range adjustment module 106 includes a frequency selection unit 1062 .

[0121] The frequency selection unit 1062 is used to direct the laser light whose polarization direction in the fundamental frequency light satisfies the optical axis of the frequency selection unit 1062 toward the first cavity mirror 104 .

[0122] Specifically, the frequency selection unit 1062 is used to make the fundamental frequency light form equal-inclination interference, and through the above-mentioned fundamental frequency light oscillation unit, select the required longitudinal mode to participate in the light oscillation, suppress the generation of redundant longitudinal modes, thereby playing the role of frequency selection filtering.

[0123] In this embodiment, the frequency selection unit 1062 may be a Fabry-Perot etalon (FP etalon for short), that is, a Fabry-Perot tunable filter.

[0124] Specifically, the frequency selection unit 1062 can allow light in a specific wavelength band to pass through, while suppressing fundamental frequency light in other wavelength bands outside the specific wavelength band from participating in optical oscillation.

[0125] It should be noted that, in the pump laser 100 provided in this embodiment, only the frequency selection unit 1062 or only the birefringent crystal 1061 may be provided, or both the birefringent crystal 1061 and the frequency selection unit 1062 may be provided. Figure 5 As shown, the birefringent crystal 1061 is arranged on a side close to the VECSEL 103, and the frequency selection unit 1062 is arranged on a side close to the first cavity mirror 104. Alternatively, the birefringent crystal 1061 may be arranged on a side close to the first cavity mirror 104, and the frequency selection unit 1062 may be arranged on a side close to the VECSEL 103. This embodiment of the present application is not limited thereto.

[0126] In order to reduce the wavelength band of the light irradiated to the first cavity mirror 104 as much as possible, the birefringent crystal 1061 and the frequency selection unit 1062 can be set simultaneously. Thus, under the joint action of the two, the central wavelength line width of the fundamental frequency spectrum irradiated to the first cavity mirror 104 can reach the required index, such as 0.002nm.

[0127] For a possible implementation, see Figure 6 The pump laser 100 also includes a pump light source 107 .

[0128] The pump light source 107 is disposed on the incident side of the focusing unit 101 .

[0129] The pump light source 107 is used to emit the pump light to the focusing unit 101 .

[0130] In this embodiment, the pump light source 107 may be any possible light source. For example, the pump light source 107 may be a laser diode (Laser Diode, LD for short).

[0131] It is worth noting that the light emitting surface of the pump light source 107 can be arranged on the incident side of the focusing unit 101, so that the pump light emitted by the pump light source 107 can be correctly emitted to the focusing unit 101. That is, the pump light source 107 and the focusing unit 101 can constitute a pumping system, so that the focusing unit 101 can collimate the pump light emitted by the pump light source 107, and focus the collimated pump light on the surface of the VECSEL 103, so as to ensure that a suitable light spot is generated on the VECSEL 103.

[0132] In one possible approach, see Figure 6 The pump laser 100 further includes a light splitting unit 108 and a photodiode 109 .

[0133] The light splitting unit 108 is disposed on the exit side of the first cavity mirror 104 .

[0134] The light splitting unit 108 is used to split the frequency-doubled laser emitted by the first cavity mirror 104 into a first light beam and a second light beam, and emit the first light beam to the photodiode 109 and emit the second light beam to the outside.

[0135] The photodiode 109 generates detection power based on the first light beam.

[0136] In this embodiment, the light splitting unit 108 may be a beam splitter. The propagation directions of the first light beam and the second light beam are different.

[0137] The photodiode 109 may be a photodiode (PD for short). When the first light beam irradiates the photodiode 109 , the photodiode 109 may generate an electrical signal for representing the real-time power size based on the first light beam.

[0138] In this embodiment, the detection electric energy is used to characterize the real-time power of the pump light source 107 .

[0139] In one possible way, in order to minimize the impact on external devices that need to use lasers, the light intensity of the first light beam can be less than the light intensity of the second light beam. Specifically, when the light splitting unit 108 splits the light, 99% of the frequency-doubled laser light emitted by the first cavity mirror 104 can be split into the second light beam, and 1% of the frequency-doubled laser light emitted by the first cavity mirror 104 can be split into the first light beam. This embodiment of the present application is not limited to this.

[0140] In this way, the real-time power of the pump light source 107 can be accurately obtained without affecting the use of laser by external devices.

[0141] In one possible approach, see Figure 6 The pump laser 100 further includes a driving module 110 .

[0142] The driving module 110 is connected to the photodiode 109 and the pump light source 107 respectively.

[0143] The driving module 110 is used to receive the detection power output by the photodiode 109 and adjust the current output to the pump light source 107 according to the detection power.

[0144] In this embodiment, the driving module 110 may be a module for outputting an operating voltage to the pump light source 107 .

[0145] Since the detection electric energy output by the photodiode 109 can represent the real-time power of the pump light source 107, when the detection electric energy represents that the real-time power is less than the set power, the driving module 110 can increase the current output to the pump light source 107. When the detection electric energy represents that the real-time power is greater than the set power, the driving module 110 can reduce the current output to the pump light source 107.

[0146] In some possible implementations, whether the real-time power is less than the set power may be determined specifically according to the voltage value of the detected electric energy, or may be determined in any other possible manner. This embodiment of the present application does not limit this.

[0147] In this way, the pump light source 107 can be controlled at a constant power, so that the pump light, the fundamental frequency spectrum, and the frequency-doubled laser can all remain stable, thereby further improving the stability of the laser.

[0148] On the basis of the above implementation modes and based on the same concept, an embodiment of the present application further provides an electronic device.

[0149] For example, see Figure 7 An electronic device 200 provided in an embodiment of the present application may include the pump laser 100 provided in any of the above embodiments.

[0150] It can be understood that the electronic device 200 provided in the embodiment of the present application can realize the functions that can be realized by any pump laser 100 provided in the above-mentioned embodiments, and has corresponding beneficial effects, which will not be elaborated here.

[0151] It should be noted that, in this article, relational terms such as "first" and "second" are only used 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, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0152] The above are only specific embodiments of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pump laser, characterized in that: The pump laser comprises: a focusing unit, a fundamental frequency light oscillating cavity unit, and a frequency doubling unit; the fundamental frequency light oscillating cavity unit comprises a vertical external cavity surface emitting laser chip, a first cavity mirror, and a second cavity mirror; The incident side of the focusing unit is used to receive pump light, the vertical external cavity surface emitting laser chip is arranged on the exit side of the focusing unit, the first cavity mirror is arranged on the exit side of the vertical external cavity surface emitting laser chip, the frequency doubling unit is arranged on the exit side of the first cavity mirror, and the second cavity mirror is arranged on the exit side of the frequency doubling unit; Wherein, the focusing unit is used to focus the pump light on the surface of the vertical external cavity surface emitting laser chip; The fundamental frequency light oscillator cavity unit is used to oscillate and amplify the fluorescence emitted by the vertical external cavity surface emitting laser chip so that the fluorescence forms fundamental frequency light; the fluorescence is generated by the vertical external cavity surface emitting laser chip under the excitation of the pump light, and the propagation direction of the fluorescence is perpendicular to the surface of the vertical external cavity surface emitting laser chip; The first cavity mirror is used to reflect the fluorescence and / or the fundamental frequency light to emit a first reflected light to the frequency doubling unit and emit a second reflected light to the vertical external cavity surface emitting laser chip; The frequency doubling unit is used to double the frequency of the first reflected light and emit the frequency-doubled laser to the second cavity mirror; the second cavity mirror is used to reflect the frequency-doubled laser back to the first cavity mirror; The first cavity mirror is further used to output the frequency-doubled laser; the vertical external cavity surface emitting laser chip is further used to emit new fluorescence toward the first cavity mirror under the excitation of the second reflected light.

2. The pump laser according to claim 1, characterized in that: The frequency doubling unit includes a frequency doubling crystal; The optical axis of the frequency doubling crystal is coaxial with the first reflected light, and the surface of the second cavity mirror is perpendicular to the first reflected light; The frequency doubling crystal is used to double the frequency of the first reflected light to obtain the frequency doubling laser, and emit the frequency doubling laser to the second cavity mirror.

3. The pump laser according to claim 1, characterized in that: The first cavity mirror and the second cavity mirror are concave mirrors; The incident surface of the first cavity mirror is provided with a first coating, and the incident surface of the second cavity mirror is provided with a second coating; The first coating is used to reflect the fundamental frequency light and emit the frequency-doubled laser; The second coating is used for reflecting the frequency-doubled laser.

4. The pump laser according to claim 1, characterized in that: The pump laser also includes a laser spectrum range adjustment module; The laser spectrum range adjustment module is arranged between the vertical external cavity surface emitting laser chip and the first cavity mirror; The laser spectrum range adjustment module is used to screen and / or filter the fundamental frequency light, and emit the adjusted fundamental frequency light to the first cavity mirror.

5. The pump laser according to claim 4, characterized in that: The laser spectrum range adjustment module includes a birefringent crystal; The optical axis of the birefringent crystal and the polarization direction of the fundamental frequency light form an included angle of a preset angle; The birefringent crystal generates a first refracted light and a second refracted light based on birefringence characteristics and the fundamental frequency light, and directs the first refracted light or the second refracted light toward the first cavity mirror.

6. The pump laser according to claim 4, characterized in that: The laser spectrum range adjustment module includes a frequency selection unit; The frequency selection unit is used to direct the laser light in the fundamental frequency light whose polarization direction satisfies the optical axis of the frequency selection unit toward the first cavity mirror.

7. The pump laser according to any one of claims 1 to 6, characterized in that: The pump laser also includes a pump light source; The pump light source is arranged on the incident side of the focusing unit; The pump light source is used to emit the pump light to the focusing unit.

8. The pump laser according to claim 7, characterized in that: The pump laser also includes a light splitting unit and a photodiode; The light splitting unit is arranged on the exit side of the first cavity mirror; The light splitting unit is used to split the frequency-doubled laser output by the first cavity mirror into a first light beam and a second light beam, and emit the first light beam to the photodiode and output the second light beam to the outside; The photodiode generates detection electric energy based on the first light beam, and the detection electric energy is used to characterize the real-time power of the pump light source; The light intensity of the first light beam is smaller than the light intensity of the second light beam.

9. The pump laser according to claim 8, characterized in that: The pump laser also includes a driving module; The driving module is connected to the photodiode and the pump light source respectively; The driving module is used to receive the detection electric energy output by the photodiode, and adjust the magnitude of the current output to the pump light source according to the detection electric energy.

10. An electronic device, characterized in that: The electronic device comprises a pump laser as claimed in any one of claims 1 to 9.

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