CN216648856U - All-solid-state praseodymium-doped annular cavity single-frequency laser device - Google Patents
All-solid-state praseodymium-doped annular cavity single-frequency laser device Download PDFInfo
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Abstract
The utility model discloses an all-solid-state praseodymium-doped annular cavity single-frequency laser device, which comprises a blue light semiconductor laser, wherein a focusing lens, a first annular laser cavity end mirror, a praseodymium-doped laser material and a second annular laser cavity end mirror are sequentially arranged on a light path of the blue light semiconductor laser; the utility model adopts the annular cavity technology to construct the laser which runs in a single direction, and avoids the standing wave effect, thereby eliminating the space hole burning effect and obtaining the single-frequency laser output with high performance.
Description
Technical Field
The utility model is applied to the field of single-frequency laser, and particularly relates to an all-solid-state praseodymium-doped annular cavity single-frequency laser device.
Background
Visible light laser has great application requirements in the fields of display, communication, biomedicine, optical sensing, spectroscopy, high-end manufacturing and the like; on the other hand, single longitudinal mode (i.e., single frequency) lasers have better coherence than multi-longitudinal mode lasers, and their low noise advantage is also desirable for many applications. For the uniform widening medium, the main reason for generating the multi-longitudinal mode laser is the spatial hole burning effect generated by a standing wave laser cavity, and the annular cavity technology avoids the standing wave effect by constructing the laser which runs in a single direction, so that the spatial hole burning effect is eliminated, and the method is a very important single-frequency laser generation technology.
The currently common implementation means of visible light single-frequency laser include:
1. the neodymium-doped laser intracavity frequency doubling scheme based on the ring cavity technology realizes visible light single-frequency laser, which is the most mature scheme in commercialization at present. Most commonly used in this method are neodymium-doped laser materials (e.g., Nd: YAG and Nd: YVO)4Etc.) as gain medium, realize the single-frequency fundamental wave laser of near-infrared wave band through constructing the annular chamber, because inserted the frequency doubling crystal in the intracavity, therefore can further obtain the single-frequency laser of visible light wave band. However, this method requires frequency doubling, and thus the system is complex, not compact, inefficient, and costly; and the frequency doubling crystal needs temperature control to realize stable output, which further increases the complexity of the system and often causes poor stability of the system.
2. The scheme is based on other single-frequency technology combined with frequency doubling technology. Most of the laser materials are neodymium-doped laser materials, and frequency doubling crystals are combined; the single-frequency technology also comprises an ultra-short cavity method, a birefringence filtering method, a torsional pendulum cavity method, a standard method and the like, but only the birefringence filtering method and the torsional pendulum cavity method which can be effectively combined with the frequency doubling technology to realize visible light single frequency are available. The disadvantage is the same as the method for realizing visible light single-frequency laser by the frequency doubling scheme in the neodymium-doped laser cavity based on the ring cavity technology.
3. A praseodymium doping single frequency laser scheme. The currently reported praseodymium-doped visible light band single-frequency laser comprises:
(1) a method for inserting an etalon into a praseodymium-doped laser cavity. For details, see the recently published academic papers Yunshan Zhang, Lunbin Zhou, Teng Zhang, Yaqi Cai, Bin Xu, Xiaodong Xu, Jun Xu, "Blue diode-pumped single-longitudinal-mode Pr: YLF lasers in orange spectral region," Optics and Laser Technology 130,106373(2020), the schematic diagram of the Laser device is shown in FIG. 5.
(2) A praseodymium doping torsional pendulum cavity single-frequency laser method. See in detail the academic papers published by Nanjing university of science and Technology, Saiyu Luo, Zhiping Cai, Huiying Xu, Zhe Shen, Hao Chen, Li Li, Yun Cao, "Direct interaction at 640-nm in single longitudinal mode with a diodeputy Pr: YLF solid-state Laser," Optics and Laser Technology 116, 112116 (2019), the schematic diagram of the Laser device is shown in FIG. 6.
Disclosure of Invention
The utility model aims to solve the technical problem of the prior art and provides an all-solid-state praseodymium-doped annular cavity single-frequency laser device.
In order to solve the technical problem, the all-solid-state praseodymium-doped annular cavity single-frequency laser device comprises a blue-light semiconductor laser, wherein a focusing lens, a first annular laser cavity end mirror, a praseodymium-doped laser material and a second annular laser cavity end mirror are sequentially arranged on a light path of the blue-light semiconductor laser;
a third annular laser cavity end mirror is arranged on a reflection light path of the second annular laser cavity end mirror, an optical rotator, a half-wave plate, a polarizer and a fourth annular laser cavity end mirror are sequentially arranged on the reflection light path of the third annular laser cavity end mirror, and the first annular laser cavity end mirror is positioned on the reflection light path of the fourth annular laser cavity end mirror;
the laser comprises a blue-light semiconductor laser, a praseodymium-doped laser material, a focusing lens, a first annular laser cavity end mirror, a second annular laser cavity end mirror, a third annular laser cavity end mirror and a fourth annular laser cavity end mirror, wherein pump light output by the blue-light semiconductor laser enters the praseodymium-doped laser material through the focusing lens and the first annular laser cavity end mirror, the praseodymium-doped laser material converts the pump light into praseodymium-doped visible light laser, the praseodymium-doped visible light laser is transmitted in a single direction in an annular laser cavity formed by the first annular laser cavity end mirror, the second annular laser cavity end mirror, the third annular laser cavity end mirror and the fourth annular laser cavity end mirror to output single-frequency laser, and in the process, reverse transmission light passes through an optical rotator and a half-wave plate to enable polarization of the reverse transmission light to rotate and be inconsistent with the light transmission direction of the polarizer, so that high loss of the reverse transmission light is caused, and formation of the reverse transmission laser is inhibited.
As a possible implementation, further, the focusing lens is an aspheric focusing lens, and the focal length thereof is 100 mm.
As a possible implementation, further, the first ring laser cavity end mirror is a curved mirror, and is highly transparent to the pump light wavelength and highly reflective to the intra-cavity visible laser light.
As a possible implementation, further, the second annular laser cavity end mirror is a curved mirror and is highly reflective to intra-cavity visible laser light.
As a possible implementation manner, further, the third ring laser cavity end mirror is a plane mirror and is highly reflective to the intra-cavity visible laser light.
As a possible implementation, further, the fourth ring-shaped laser cavity end mirror is a flat mirror and is partially transmissive to the intra-cavity visible laser light.
As a possible implementation manner, further, the praseodymium-doped laser material is Pr: LiYF4And (4) crystals.
As a possible embodiment, further, the optical rotator is TGG crystal applying a magnetic field.
By adopting the technical scheme, the utility model has the following beneficial effects:
the utility model can output single-frequency laser with good coherence, adopts the annular cavity technology to avoid standing wave effect by constructing laser which runs in one direction, thereby eliminating space hole burning effect, has simple structure, and solves the problem that the scheme of realizing visible light single-frequency laser by the frequency doubling scheme in the neodymium-doped laser cavity based on the annular cavity technology needs frequency doubling, so that the system is complex and not compact, has low efficiency and high cost; and the frequency doubling crystal needs temperature control to realize stable output, which further increases the complexity of the system and often causes poor stability of the system.
Drawings
The utility model is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a schematic diagram of the variation of single-frequency laser output power with absorbed pump power in the experiment of the present invention;
FIG. 3 is a schematic diagram of a circular cavity praseodymium-doped single-frequency red light laser spectrum in an experiment of the present invention;
FIG. 4 is a diagram of single-frequency laser characteristics measured by an F-P scanning interferometer in an experiment according to the present invention;
FIG. 5 is a schematic diagram of a single-frequency laser device obtained by inserting an etalon into a praseodymium-doped laser cavity according to the background art of the present invention;
FIG. 6 is a schematic diagram of a praseodymium doping torsional pendulum cavity obtaining single frequency laser device in the background art of the present invention;
fig. 7 is a schematic structural diagram of embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the present invention provides an all-solid-state praseodymium-doped ring cavity single-frequency laser device, which comprises a blue light semiconductor laser 1, wherein a focusing lens 2, a first ring laser cavity end mirror 3.1, a praseodymium-doped laser material 4 and a second ring laser cavity end mirror 3.2 are sequentially arranged on a light path of the blue light semiconductor laser 1;
a third annular laser cavity end mirror 3.3 is arranged on a reflection light path of the second annular laser cavity end mirror 3.2, an optical rotator 5, a half-wave plate 6, a polarizer 7 and a fourth annular laser cavity end mirror 3.4 are sequentially arranged on the reflection light path of the third annular laser cavity end mirror 3.3, and the first annular laser cavity end mirror 3.4 is positioned on the reflection light path of the fourth annular laser cavity end mirror 3.1;
the blue light semiconductor laser 1 outputs pump light which is incident into a praseodymium-doped laser material 4 through a focusing lens 2 and a first annular laser cavity end mirror 3.1, the praseodymium-doped laser material 4 converts the pump light into praseodymium-doped visible light laser, the praseodymium-doped visible light laser is transmitted in a single direction in an annular laser cavity formed by the first annular laser cavity end mirror 3.1, a second annular laser cavity end mirror 3.2, a third annular laser cavity end mirror 3.3 and a fourth annular laser cavity end mirror 3.4 to output single-frequency laser, and in the process, the polarization of the reversely transmitted light is rotated through an optical rotator 5 and a half-wave plate 6 and is not consistent with the light transmission direction of a polarizer 7 so as to loss the reversely transmitted light.
The focusing lens 2 is an aspheric focusing lens 2, and the focal length of the focusing lens is 100 mm. The first ring laser cavity end mirror 3.1 is a curved mirror, and has high transmittance to the pump light wavelength and high reflection to the visible light laser in the cavity. The second annular laser cavity end mirror 3.2 is a curved mirror and is highly reflective of the intracavity visible laser light. The third ring laser cavity end mirror 3.3 is a plane mirror and highly reflective to the intra-cavity visible laser light. The fourth ring-shaped laser cavity end mirror 3.4 is a flat mirror and is partially transmissive for the intra-cavity visible laser light. The praseodymium-doped laser material 4 is Pr: LiYF4And (4) crystals. The optical rotator 5 is TGG crystal to which a magnetic field is applied.
FIG. 1 includes a 1 blue semiconductor laser; 2 aspheric focusing lens (the lens used in the experiment is focused to 100 mm); 3.1/3.2/3.3/3.4 annular laser cavity end face mirror (wherein 3.1 is a curved mirror, a plano-concave lens with 100mm curvature radius is adopted in the experiment, the coating is high-transmittance on pump light wavelength and high-reflectance on visible light laser in a cavity, 3.2 is a curved mirror, a plano-concave lens with 100mm curvature radius is adopted in the experiment, the coating is high-reflectance on visible light laser in the cavity, 3.3 is a plane mirror with high-reflectance on visible light laser in the cavity, 3.4 is a plane mirror with 3% transmittance on the part of visible light laser in the cavity, the coating is used as an output mirror, and 4 is doped with praseodymium laser material (Pr is adopted in the experiment: LiYF)4Crystals); 5 optical rotator (TGG crystal applied with magnetic field is used in the experiment); 6 half-wave plate; and 7 a polarizer.
Praseodymium-doped laser can be excited in blue light, green light, orange light, red light and deep red light wave bands, in the patent, the praseodymium-doped red light is taken as an example to carry out experimental research, and the experimental research results of the related 'all-solid-state praseodymium-doped ring cavity single-frequency laser' are shown in fig. 2, fig. 3 and fig. 4;
in fig. 1, a pump source "1" is a commercial blue semiconductor laser, pump light is incident into a laser crystal "4" via a focusing mirror "2" and an input mirror "3.1", and the laser crystal is a laser gain material and is a working substance of laser. The pumping light is absorbed by the laser crystal and converted into praseodymium-doped visible light laser. The laser cavity is of a ring structure and consists of four coated lenses of 3.1, 3.2, 3.3 and 3.4 as shown in the figure. The visible laser light propagates in the ring laser cavity as indicated by the arrows in the figure, and thus the ring cavity is characterized by unidirectional laser light propagation within the cavity. In order to completely eliminate the spatial hole burning effect and obtain single-frequency laser output, an optical rotator '5', a half-wave plate '6' and a polarizer '7' are also required to be inserted into a laser cavity, wherein the polarization of the reverse transmission light is rotated by the '5' and the '6' so as to be inconsistent with the light transmission direction of the polarizer '7', loss to the reverse light is caused, the reverse light cannot start to vibrate, the spatial hole burning effect is completely eliminated, and single-frequency laser is obtained. The finally obtained praseodymium-doped visible light wave band single-frequency laser is output from a plane mirror 3.4. Fig. 2 is a relation curve of output power and absorbed pump power of the ring cavity praseodymium-doped single-frequency red light, and when the absorbed pump power is 4.1 watts, 365 milliwatts of single-frequency laser is obtained. FIG. 3 is a spectrum of a red monochromatic laser light obtained in the experiment, with a peak wavelength of 639.78 nm. FIG. 4 is a graph of the single frequency laser characteristics we measured with a commercial F-P scanning interferometer (SA200-5B, Thorlabs Corp.), demonstrating that the single longitudinal mode laser output obtained in the experiment is indeed single.
Example 2
An all-solid-state praseodymium-doped ring cavity single-frequency laser device is provided, which has the same main structure as that of embodiment 1, and is mainly different from the embodiment in that a polarizer is not included, and instead, the function of replacing the polarizer is realized by processing a praseodymium-doped laser material 4 into a Brewster angle (Brewster).
The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.
Claims (10)
1. The utility model provides an all-solid-state praseodymium-doped annular cavity single-frequency laser device which characterized in that: the laser comprises a blue-light semiconductor laser, wherein a focusing lens, a first annular laser cavity end mirror, a praseodymium-doped laser material and a second annular laser cavity end mirror are sequentially arranged on a light path of the blue-light semiconductor laser;
and a third annular laser cavity end mirror is arranged on a reflection light path of the second annular laser cavity end mirror, an optical rotator, a half-wave plate and a fourth annular laser cavity end mirror are sequentially arranged on the reflection light path of the third annular laser cavity end mirror, and the first annular laser cavity end mirror is positioned on the reflection light path of the fourth annular laser cavity end mirror.
2. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, characterized in that: and a polarizer is also arranged between the half-wave plate and the fourth ring-shaped laser cavity end mirror on the reflecting light path of the third ring-shaped laser cavity end mirror.
3. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, characterized in that: the praseodymium-doped laser material is processed to a Brewster angle.
4. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, characterized in that: and the second annular laser cavity end mirror is a curved mirror and has high reflection to the visible light laser in the cavity.
5. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, characterized in that: the third annular laser cavity end mirror is a plane mirror and has high reflection to visible laser in the cavity.
6. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, characterized in that: the fourth annular laser cavity end mirror is a plane mirror and partially transmits visible laser in the cavity.
7. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, wherein: the praseodymium-doped laser material is Pr, LiYF4And (4) crystals.
8. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, characterized in that: the rotator is a TGG crystal that applies a magnetic field.
9. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, wherein: the focusing lens is an aspheric focusing lens, and the focal length of the focusing lens is 100 mm.
10. The all-solid-state praseodymium-doped ring cavity single-frequency laser device according to claim 1, characterized in that: the end mirror of the first annular laser cavity is a curved mirror, and the end mirror is highly transparent to the pump light wavelength and highly reflective to the visible light laser in the cavity.
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