CN115954752A - Visible light waveband narrow linewidth laser device based on optical parametric oscillator and working method thereof - Google Patents
Visible light waveband narrow linewidth laser device based on optical parametric oscillator and working method thereof Download PDFInfo
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Abstract
The invention discloses a visible light wave band narrow linewidth laser device based on an optical parametric oscillator, which comprises a pump light source, a collimation focusing lens group and a V-shaped OPO frequency doubling resonant cavity, wherein the pump light source is used for providing pump light, the collimation focusing lens group is used for collimating and focusing the pump light to the resonant cavity, and the V-shaped OPO frequency doubling resonant cavity is used for generating signal light and frequency doubling light thereof under the irradiation of quasi-continuous pump light; the invention provides a solution for obtaining visible light wave band narrow linewidth laser based on an optical parametric oscillator and an optical frequency multiplication principle, has the advantage of simple structure, and has low requirement on the linewidth of a pump light source; meanwhile, a quasi-continuous 532nm laser pumping source with the repetition frequency of 10kHz is adopted to construct an optical parametric oscillator frequency doubling resonant cavity, visible light output with narrow line width can be obtained, the output laser wavelength is between 0.57 and 0.63 mu m, the line width is less than 0.1nm, and the average power is more than 0.1 watt.
Description
Technical Field
The invention relates to the technical field of all-solid-state laser, in particular to a visible light waveband narrow linewidth laser device based on an optical parametric oscillator and a working method thereof.
Background
An Optical Parametric Oscillator (OPO) is an important way to realize nonlinear frequency conversion, and its output wavelength is continuously tunable and can cover the band that the laser cannot directly generate. A high-frequency light wave with high light intensity and a low-frequency light wave with low light intensity are incident into the same nonlinear crystal, if the crystal meets a specific phase matching condition, a new difference frequency light wave can be finally obtained according to a three-wave interaction principle, and meanwhile, the incident low-frequency weak signal is amplified, and the process is called a parametric amplification process. If the nonlinear crystal is put into an optical resonant cavity and is still irradiated by high-intensity high-frequency optical waves (called pump light), when the gain of the optical waves is larger than the loss of the resonant cavity, oscillating signal optical waves and difference frequency optical waves can be established from the noise in the cavity, and the optical parametric oscillator is formed. The incident high-frequency and low-frequency optical waves are referred to as pump light and signal light, respectively, and the generated difference-frequency optical wave is referred to as idler light.
Tunable laser is often required in a plurality of research fields including spectral analysis, and the optical parametric oscillator can realize tunable laser output from ultraviolet to infrared bands by combining frequency doubling technology. The tunable laser output in the visible light band (390 nm-780 nm) is mainly dye laser, especially quasi-continuous tunable laser with repetition frequency above kilohertz. The dye laser has the advantages that the service life of the dye is short generally, the dye laser needs to be replaced frequently, the maintenance work is complicated, some dyes have toxicity, adverse effects can be caused on the health of users, and the generated dye waste liquid can pollute the environment. If the solid laser medium is used for generating laser in a visible light wave band, the inherent defects of the dye laser can be effectively avoided. One of the technical means for obtaining the visible light band tunable laser is a near-infrared parametric oscillator with an output wavelength of about 1 micrometer (μm) combined with a frequency doubling technology. However, the laser generated by the optical parametric oscillator generally has a wide line width, so that the application range thereof is greatly limited. To obtain narrow-linewidth optical parametric oscillation laser, pump light or seed light with narrow linewidth is often required, and the light source has high technical difficulty, complex structure and difficult acquisition.
Disclosure of Invention
The invention aims to provide a visible light waveband narrow linewidth laser device based on an optical parametric oscillator, aiming at the problems of high technical difficulty, complex structure and difficult acquisition of a light source in the prior art.
The invention also provides a working method of the visible light waveband narrow linewidth laser device based on the optical parametric oscillator.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a visible light wave band narrow linewidth laser device based on an optical parametric oscillator comprises a pump light source, a collimation focusing lens group and a V-shaped OPO frequency doubling resonant cavity, wherein the pump light source is used for providing pump light, the collimation focusing lens group is used for collimating and focusing the pump light to the resonant cavity, and the V-shaped OPO frequency doubling resonant cavity is used for generating signal light and frequency doubling light thereof under the irradiation of quasi-continuous pump light;
the OPO frequency doubling resonant cavity comprises a signal light total reflection mirror, an OPO crystal, a spectroscope for separating signal light and pumping light, a frequency doubling crystal, a harmonic reflector and a visible light output mirror, wherein a birefringent optical filter for adjusting the loss of the signal light in the resonant cavity is arranged between the spectroscope and the wave absorbing reflector;
the pump light source, the collimating focusing lens group, the signal light total reflection mirror and the OPO crystal are sequentially arranged on the same optical axis, the birefringent optical filter, the harmonic reflector, the frequency doubling crystal and the visible light output mirror are arranged on the same optical axis, and an included angle exists between the optical axis where the OPO crystal is located and the optical axis where the frequency doubling crystal is located.
In the above technical scheme, the pump light source is a solid laser, the repetition frequency is 8-12 kHz, and the beam quality factor M 2 Is 10 to 15.
In the technical scheme, the OPO crystal and the frequency doubling crystal are both arranged in a water-cooling clamp.
In the above technical solution, the collimating and focusing lens group is composed of two convex lenses, the focal length ratio of the two convex lenses is (1-3): 1, and preferably one collimating lens and one focusing lens.
In the above technical solution, the OPO crystal and the frequency doubling crystal are made of BBO, LBO, or KTP, preferably KTP, and are cut at a phase matching angle of a central wavelength of the specific signal light.
In the above technical scheme, the spectroscope is a concave mirror, and the surface of the spectroscope is plated with a film which is highly transparent to the pump light and highly reflective to the signal light.
In the above technical scheme, the signal light total reflection mirror is a plane mirror, and a film which is highly transparent to the pump light and highly reflective to the signal light is plated on the surface of the plane mirror.
In the above technical scheme, the visible light output mirror is a plane mirror, and the surface of the visible light output mirror is plated with a film which is highly reflective to fundamental frequency light and highly transparent to frequency doubling light.
In the above technical solution, the visible light band narrow linewidth laser device further includes an absorber, the absorber is disposed on the other side of the spectroscope, and the absorber is made of aluminum material.
A working method of a visible light wave band narrow linewidth laser device comprises the following steps:
step 1, the pump light source emits a beam of laser, and the beam passes through the collimating and focusing lens group to be focused into the OPO crystal through the signal light total reflection mirror;
and 4, inserting the birefringent optical filter and rotating the optical axis to a proper position to enable the output visible light to have the strongest power, and obtaining the visible light with narrow line width after frequency doubling.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a solution for obtaining visible light waveband narrow linewidth laser based on an optical parametric oscillator and an optical frequency multiplication principle, has the advantage of simple structure, and has low requirement on the linewidth of a pump light source.
2. The invention provides a visible light wave band narrow linewidth laser device with a simpler structure, which adopts a quasi-continuous 532nm laser pumping source with the repetition frequency of 10kHz to construct an optical parametric oscillator frequency doubling resonant cavity, visible light output with a narrow linewidth can be obtained, the output laser wavelength is between 0.57 and 0.63 mu m, the linewidth is less than 0.1nm, and the average power is more than 0.1 watt.
Drawings
Fig. 1 is a structural diagram of a visible light band narrow linewidth laser device.
In the figure: the optical fiber laser comprises a 1-pumping light source, a 2-collimating lens, a 3-focusing lens, a 4-optical total reflection mirror, a 5-OPO crystal, a 6-spectroscope, a 7-birefringent optical filter, an 8-harmonic reflector, a 9-frequency doubling crystal, a 10-visible light output mirror and an 11-absorber.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A visible light wave band narrow linewidth laser device based on an optical parametric oscillator comprises a pumping light source 1 for providing pumping light, a collimation focusing lens group for collimating and focusing the pumping light to a resonant cavity and a V-shaped OPO frequency doubling resonant cavity for generating signal light and frequency doubling light thereof under the irradiation of quasi-continuous pumping light, which are sequentially arranged. The OPO frequency doubling resonant cavity comprises a signal light total reflection mirror 4, an OPO crystal 5, a spectroscope 6 for separating signal light and pumping light, a frequency doubling crystal 9, a harmonic wave reflector 8 and a visible light output mirror 10. The pump light source 1 is a quasi-continuous-running green light solid laser, the output laser wavelength is 532nm, the repetition frequency is 8-12 kHz, and the beam quality factor M 2 Is 10 to 15. A birefringent filter 7 used for adjusting the loss of the signal light in the resonant cavity is arranged between the spectroscope 6 and the wave-absorbing reflector, and the OPO crystal 5 and the frequency doubling crystal 9 are both arranged in a water-cooling clamp.
The pump light source 1, the collimating and focusing lens group, the signal light total reflection mirror 4 and the OPO crystal 5 are sequentially arranged on the same optical axis, and the birefringent optical filter 7, the harmonic reflector 8, the frequency doubling crystal 9 and the visible light output mirror 10 are arranged on the same optical axis. An included angle exists between the optical axis of the OPO crystal 5 and the optical axis of the frequency doubling crystal 9.
When the laser oscillator is used, the pumping light source 1 emits a green laser beam with a wavelength of 532nm, the green laser beam passes through the collimating and focusing lens 3 groups, the collimating and focusing lens 3 groups enable the light beam to pass through the signal light total reflection mirror 4 and be focused into the OPO crystal 5, at this time, the signal light total reflection mirror 4, the beam splitter 6 and the visible light output mirror 10 form a V-shaped optical parametric oscillator resonant cavity, the harmonic reflection mirror 8, the frequency doubling crystal 9 and the visible light output mirror 10 form a typical intracavity frequency doubling structure, and an included angle between the normal direction of the mirror surface of the beam splitter 6 and incident light is about 22.5 degrees. And adjusting the signal light total reflection mirror 4, the OPO crystal 5, the harmonic reflection mirror 8, the frequency doubling crystal 9 and the visible light output mirror 10 to be in a collimation state, when the pump light is increased to a certain power (8-10W), oscillating signal light and idle frequency light in a cavity of the V-shaped optical parametric oscillator resonant cavity, converting the signal light into visible light through the frequency doubling crystal 9, and adjusting the signal light total reflection mirror 4 and the visible light output mirror 10 to enable the output signal light to be strongest outside the cavity output by the visible light output mirror 10. Then, the birefringent filter 7 is inserted into the position shown in fig. 1, and the optical axis is rotated to a proper position, so that the power of the output visible light is strongest, and at this time, the line width of the visible light is compressed, because only the signal light in a small range near the central wavelength passes through the birefringent filter 7, the polarization state remains substantially unchanged, the phase matching condition of the OPO crystal 5 can be continuously satisfied, only the signal light with a narrow line width (fundamental frequency light) oscillates in the resonant cavity, and the visible light with a narrow line width is obtained after frequency doubling. When the wavelength of the output light needs to be changed, the pitch of the OPO crystal 5 can be adjusted to change the phase matching angle, the wavelength of the signal light can be continuously changed within a certain range, and therefore the wavelength of the output visible light can be changed.
Example 2
On the basis of the embodiment 1, the collimating and focusing lens group consists of two convex lenses, the focal length ratio of the two convex lenses is (1-3): 1, and specifically, a collimating lens 2 and a focusing lens 3 are included.
The signal light total reflection mirror 4 is a plane mirror, and the surface of the signal light total reflection mirror is plated with a film which is highly transparent to pump light (532 nm) and highly reflective to signal light (1.1-1.3 mu m).
The OPO crystal 5 is made of BBO, LBO, or KTP, and is a KTP crystal in this embodiment, cut at a phase matching angle of a certain signal light center wavelength (1.15 μm or 1.26 μm in this embodiment), and mounted in a jig through which water is passed for cooling.
The spectroscope 6 is a concave mirror, and the surface of the spectroscope is coated with a film (the incident angle is about 22.5 degrees) which is highly transparent to the pump light and highly reflective to the signal light, so that the residual pump light can be transmitted out of the resonant cavity.
The harmonic reflector 8 is a plane mirror, and the surface of the harmonic reflector is plated with a thin film which is highly transparent to fundamental frequency light (namely signal light with the wavelength of 1.1-1.3 mu m) and highly reflective to frequency doubling light (0.55-0.65 mu m).
The frequency doubling crystal 9 is made of BBO, LBO, or KTP, and in this embodiment, is a KTP crystal, cut at a phase matching angle of a certain wavelength fundamental frequency light (1.15 μm or 1.26 μm in this embodiment), and is installed in a clamp through which water is passed for cooling.
The visible light output mirror 10 is a plane mirror, and the surface of the visible light output mirror is plated with a thin film which is highly reflective to fundamental frequency light (namely, signal light with the wavelength of 1.1-1.3 mu m) and highly transparent to frequency doubling light (0.55-0.65 mu m).
The birefringent filter 7 is a quartz crystal thin plate, and due to the birefringent effect, the loss of the signal light in the resonant cavity can be adjusted by rotating the optical axis, and the loss is sensitive to the wavelength and is used for narrowing the line width of the output signal light.
Since the pump light is only absorbed to a small extent by the OPO crystal 5, an absorber 11 is provided to absorb the remaining pump light transmitted through the beam splitter 6. The absorber 11 is arranged on the other side of the spectroscope 6, the absorber 11 is made of aluminum materials and can absorb residual pump light transmitted out of the resonant cavity, and an absorption surface for the light is a rough plane or conical surface.
Example 3
A working method of a visible band narrow linewidth laser device based on embodiment 1-2, comprising the steps of:
step 1, a beam of green laser with the wavelength of 532nm is emitted by a pump light source 1, and is collimated into an approximately parallel beam by a collimating lens 2 to be incident on a focusing lens 3, so that the beam passes through a signal light total reflection mirror 4 and is focused into an OPO crystal 5;
and 4, inserting the birefringent optical filter 7 and rotating the optical axis to a proper position to enable the output visible light power to be strongest, and obtaining the visible light with narrow line width after frequency doubling.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A visible light wave band narrow linewidth laser device based on an optical parametric oscillator is characterized by comprising a pump light source, a collimation focusing lens group and a V-shaped OPO frequency doubling resonant cavity, wherein the pump light source is used for providing pump light, the collimation focusing lens group is used for collimating and focusing the pump light to the resonant cavity, and the V-shaped OPO frequency doubling resonant cavity is used for generating signal light and frequency doubling light thereof under the irradiation of quasi-continuous pump light;
the OPO frequency doubling resonant cavity comprises a signal light total reflection mirror, an OPO crystal, a spectroscope for separating signal light and pumping light, a frequency doubling crystal, a harmonic reflector and a visible light output mirror, wherein a birefringent optical filter for adjusting the loss of the signal light in the resonant cavity is arranged between the spectroscope and the wave absorbing reflector;
the pump light source, the collimating focusing lens group, the signal light total reflection mirror and the OPO crystal are sequentially arranged on the same optical axis, the birefringent optical filter, the harmonic reflector, the frequency doubling crystal and the visible light output mirror are arranged on the same optical axis, and an included angle exists between the optical axis where the OPO crystal is located and the optical axis where the frequency doubling crystal is located.
2. The visible waveband narrow linewidth laser device of claim 1, wherein the pump light source is a solid state laser, repetitiveFrequency of 8-12 kHz, and beam quality factor M 2 Is 10 to 15.
3. The visible-light-band narrow-linewidth laser device of claim 1, wherein the OPO crystal and the frequency doubling crystal are both disposed in a water-cooled fixture.
4. The visible light band narrow linewidth laser device of claim 1, wherein the collimating and focusing lens group is composed of two convex lenses, the focal length ratio of the two convex lenses is (1-3): 1, and preferably one collimating lens and one focusing lens.
5. The narrow linewidth visible laser device of claim 1, wherein the OPO crystal and the frequency doubling crystal are BBO, LBO or KTP, preferably KTP, and are cut at a phase matching angle of a specific signal light center wavelength.
6. The visible-light-band narrow-linewidth laser apparatus according to claim 1, wherein the spectroscope is a concave mirror having a surface coated with a thin film highly transparent to the pump light and highly reflective to the signal light.
7. The visible-light-band narrow-linewidth laser device of claim 1, wherein the signal light total reflection mirror is a flat mirror, and a thin film highly transparent to the pump light and highly reflective to the signal light is coated on a surface of the flat mirror.
8. The visible-band narrow-linewidth laser apparatus of claim 1 in which the visible-light output mirror is a flat mirror coated with a thin film that is highly reflective to fundamental light and highly transmissive to octave light.
9. The visible light band narrow linewidth laser device of claim 1, further comprising an absorber disposed on the other side of the beam splitter, the absorber being an aluminum material.
10. A method of operating a narrow linewidth laser device based on any one of claims 1-9, comprising the steps of:
step 1, the pump light source emits a beam of laser, and the beam passes through the collimating and focusing lens group to be focused into the OPO crystal through the signal light total reflection mirror;
step 2, adjusting the signal light total reflection mirror, the OPO crystal, the harmonic wave reflector, the frequency doubling crystal 9 and the visible light output mirror to a collimation state;
step 3, when the pump light is increased to a preset power, the signal light is converted into visible light through the frequency doubling crystal, and the signal light total reflection mirror and the visible light output mirror are adjusted to enable the output signal light to be strongest outside the output cavity of the visible light output mirror;
and 4, inserting the birefringent optical filter and rotating the optical axis to a proper position to enable the output visible light power to be strongest, and obtaining the visible light with narrow line width after frequency doubling.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114628982A (en) * | 2020-12-11 | 2022-06-14 | 核工业理化工程研究院 | Parameter oscillation optical system and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114628982A (en) * | 2020-12-11 | 2022-06-14 | 核工业理化工程研究院 | Parameter oscillation optical system and working method thereof |
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