CN216563991U

CN216563991U - Eye-safe laser with integrated structure

Info

Publication number: CN216563991U
Application number: CN202122854708.1U
Authority: CN
Inventors: 赵虎
Original assignee: Beijing Oriental Sharp Laser Technology Co ltd
Current assignee: Beijing Oriental Sharp Laser Technology Co ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-05-17
Anticipated expiration: 2031-11-19

Abstract

The utility model provides an eye-safe laser with an integrated structure, which comprises an undoped YAG crystal, a Brewster angle cut Nd-YAG crystal and the like, wherein the Brewster angle cut Nd-YAG crystal and a corner cube prism are fixed on the upper end surface of the undoped YAG crystal, a dove prism is fixed on the side surface of the undoped YAG crystal, the Brewster angle cut Nd-YAG crystal is positioned between the corner cube prism and the dove prism, a Q-switched crystal and a KTP nonlinear crystal are fixed on the lower end surface of the undoped YAG crystal, the Q-switched crystal is positioned between the dove prism and the KTP nonlinear crystal, and a pumping module is arranged beside the Brewster angle cut Nd-YAG crystal. The utility model adopts undoped YAG crystal as a stable base, and other optical components are arranged on the stable base, thereby realizing a compact, lightweight and integrated structure, and the all-solid-state mechanical-free moving device.

Description

Eye-safe laser with integrated structure

Technical Field

The utility model belongs to the field of lasers, and particularly relates to a human eye safety laser with an integrated structure.

Background

The laser with the wavelength of 1.5-1.6 microns is positioned in the most safe wave band for human eyes, is positioned in an atmosphere transmission window with the wavelength of 1.5-1.8 microns, has high atmospheric transmittance and strong penetration to cloud and smoke, and can be applied to the fields of laser ranging, remote sensing detection, target identification and the like. An Optical Parametric Oscillator (OPO) is a reliable method of obtaining eye-safe laser light,the laser of the wave band can be conveniently obtained by pumping crystals such as potassium titanyl phosphate (KTP), potassium titanyl arsenate (KTA) and the like in a non-critical phase matching mode. Using 1.064 μm laser pumping along the x-axis (θ 90 °,

) The cut KTP crystal realizes non-critical phase matching, and can obtain 1.57 mu m eye safe laser. According to a related theoretical study, when a non-critical phase match (θ -90 °,

) The walk-off angle of KTP-OPO reaches a minimum value (about 0 degrees) and the acceptance angle reaches a maximum value (about 3.2 degrees), and the maximum effective nonlinear coefficient is about 3.64 pm/V. Small walk-off angles and large effective nonlinear coefficients are very favorable for the three-wave interaction in a parametric oscillator, while large acceptance angles can allow Nd: YAG fundamental frequency 1.064 μm pump light has a large divergence angle, and is thus well suited for multimode laser pumped optical parametric oscillators.

In the practical use process of the laser light source, in order to adapt to various applications in the military or civil field, the laser light source is required to have the smallest volume as possible, the structure is as simple as possible, the mass production is easy, and the laser light source can adapt to various severe environmental conditions, such as large-range temperature difference, severe vibration of the installation environment and other influencing factors. The existing eye-safe laser has a complex light path structure, a plurality of optical components are independently installed, the debugging is complex, and the volume of the laser is larger.

Disclosure of Invention

Aiming at the technical problems in the prior art, the utility model provides the eye-safe laser with the integrated structure, the undoped YAG crystal is used as the stable base, other optical components are arranged on the stable base, and compared with the eye-safe laser with the same type, the eye-safe laser can realize a compact, lightweight and integrated structure, has no solid-state mechanical moving device, and is suitable for being used as a light source of a handheld or pod type laser range finder.

The technical scheme adopted by the utility model is as follows: an integrally structured, eye-safe laser comprising an undoped YAG crystal, a brewster angle cut Nd: YAG crystal, transfer Q crystal, KTP nonlinear crystal, pyramid prism, dove prism, pumping module, the brewster angle cuts Nd: YAG crystal, pyramid prism are fixed in the upper end of undoped YAG crystal, said dove prism is fixed in the side of undoped YAG crystal, said Brewster angle cuts Nd: YAG crystal is located between the pyramid prism and the dove prism, the Q-switched crystal and the KTP nonlinear crystal are fixed on the lower end face of the undoped YAG crystal, the Q-switched crystal is located between the dove prism and the KTP nonlinear crystal, and the Brewster angle cuts Nd: and a pumping module is arranged beside the YAG crystal.

Further, the brewster angle cuts Nd: the light transmission surfaces of the YAG crystal, the Q-switched crystal, the pyramid prism and the dove prism are all plated with a fundamental frequency light antireflection film, the emission end surface of the KTP nonlinear crystal is plated with a fundamental frequency light total reflection film and a signal light partial transmission film, and the intracavity end surface of the KTP nonlinear crystal is plated with a fundamental frequency light antireflection film and a signal light total reflection film.

Further, the Q-switched crystal adopts Cr: YAG saturable absorption crystal.

Further, the pumping module adopts a multi-wavelength combined LD module or a single-wavelength LD module.

Compared with the prior art, the utility model has the beneficial effects that:

1. the utility model adopts undoped YAG crystal as a stable base, and the Brewster angle cuts Nd: YAG crystal, transfer Q crystal, KTP nonlinear crystal, angle pyramid prism, dove prism all fixed mounting on undoped YAG crystal, compact structure, undoped YAG crystal are optical precision finishing, and the depth of parallelism is good, and with brewster angle cutting Nd: YAG crystal is made of the same material, so that the heat effect is reduced, and the integral mechanical stability is improved.

2. The utility model adopts the Brewster angle to cut Nd: YAG crystal, has solved the problem that needs the polaroid in the light path, has simplified the light path, can directly output the polarization laser.

3. The utility model adopts the pyramid prism as the total reflection surface of the resonant cavity, has low offset sensitivity, is convenient for calibration and debugging and reduces the manufacturing cost.

4. The pumping module can adopt a multi-wavelength combined LD module, does not need temperature control and has smaller volume; or a single-wavelength LD module is adopted and matched with a temperature control system, so that higher photoelectric conversion efficiency is realized.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure, 1-undoped YAG crystal, 2-Brewster angle cutting Nd: YAG crystal, 3-Q-switched crystal, 4-KTP nonlinear crystal, 5-pyramid prism, 6-dove prism and 7-pumping module.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

An embodiment of the present invention provides an eye-safe laser with an integrated structure, as shown in fig. 1, which includes an undoped YAG crystal 1, a brewster angle cut Nd: YAG crystal 2, Q-switched crystal 3, KTP nonlinear crystal 4, pyramid prism 5, dove prism 6 and pumping module 7, wherein the Brewster angle cuts Nd: YAG crystal 2 and pyramid prism 5 are fixed on the upper end face of undoped YAG crystal 1, dove prism 6 is fixed on the side face of undoped YAG crystal 1, and the Brewster angle cuts Nd: the YAG crystal 2 is positioned between the pyramid prism 5 and the dove prism 6, the Q-switched crystal 3 and the KTP nonlinear crystal 4 are fixed on the lower end face of the undoped YAG crystal 1, the Q-switched crystal 3 is positioned between the dove prism 6 and the KTP nonlinear crystal 4, and the Brewster angle cuts Nd: a pumping module 7 is arranged beside the YAG crystal 2. The Q-switched crystal 3 adopts Cr: YAG saturable absorption crystal. The brewster angle cuts Nd: the light transmission surfaces of the YAG crystal 2, the Q-switching crystal 3, the pyramid prism 5 and the dove prism 6 are all plated with a fundamental frequency light antireflection film, the emission end surface of the KTP nonlinear crystal 4 is plated with a fundamental frequency light total reflection film and a signal light partial transmission film, and the cavity inner end surface of the KTP nonlinear crystal 4 is plated with a fundamental frequency light antireflection film and a signal light total reflection film.

Brewster angle cut Nd: the YAG crystal 2 is used to generate linearly polarized fundamental light. The KTP nonlinear crystal 4 is used to convert 1.06 μm fundamental frequency light into 1.57 μm wavelength signal light by optical parametric oscillation. The pyramid prism 5 is used as a total reflection surface of the resonant cavity. Dove prism 6 is used to fold the cavity. The pumping module 7 is used for providing pumping energy, a multi-wavelength combined LD module can be adopted, temperature control is not needed, and the volume is smaller; or a single-wavelength LD module is adopted and matched with a temperature control system, so that higher photoelectric conversion efficiency is realized.

In the installation of the embodiment, the dove prism 6 is adhered and fixed at a proper position of the undoped YAG crystal 1; the corner cube prism 5 is adhered and fixed on the undoped YAG crystal 1 according to the reference light; and sequentially cutting Nd: the YAG crystal 2 and the Q-switched crystal 3 are respectively bonded and fixed on the undoped YAG crystal 1; temporarily installing a KTP nonlinear crystal 4 on the undoped YAG crystal 1 according to the reference light; the pump module 7 was placed at brewster angle cut Nd: at a suitable position beside the YAG crystal 2, a structural member can be used, which is fixed to the undoped YAG crystal 1 (the structural member clamps the undoped YAG crystal 1), and the pump module 7 is fixed to the structural member, so that the pump module 7 is fixed to the position of the Nd at the brewster angle: distance between YAG crystals 2; and adjusting the direction of the KTP nonlinear crystal 4 according to the actual output laser energy, determining the direction of the KTP nonlinear crystal 4 when the output energy is maximum, and adhering and fixing the KTP nonlinear crystal 4 on the undoped YAG crystal 1.

The present invention has been described in detail with reference to the embodiments, but the description is only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The scope of the utility model is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teaching of the technical solutions of the present invention, should be considered to be within the scope of the present invention, and all equivalent changes and modifications made within the scope of the present invention or equivalent technical solutions designed to achieve the above technical effects are also within the scope of the present invention.

Claims

1. An eye-safe laser with an integrated structure, which is characterized in that: including undoped YAG crystal, brewster angle cut Nd: YAG crystal, transfer Q crystal, KTP nonlinear crystal, pyramid prism, dove prism, pumping module, the brewster angle cuts Nd: YAG crystal, pyramid prism are fixed in the upper end of undoped YAG crystal, said dove prism is fixed in the side of undoped YAG crystal, said Brewster angle cuts Nd: YAG crystal is located between the pyramid prism and the dove prism, the Q-switched crystal and the KTP nonlinear crystal are fixed on the lower end face of the undoped YAG crystal, the Q-switched crystal is located between the dove prism and the KTP nonlinear crystal, and the Brewster angle cuts Nd: and a pumping module is arranged beside the YAG crystal.

2. The monolithically constructed eye-safe laser of claim 1, wherein: the brewster angle cuts Nd: the light transmission surfaces of the YAG crystal, the Q-switched crystal, the pyramid prism and the dove prism are all plated with a fundamental frequency light antireflection film, the emission end surface of the KTP nonlinear crystal is plated with a fundamental frequency light total reflection film and a signal light partial transmission film, and the intracavity end surface of the KTP nonlinear crystal is plated with a fundamental frequency light antireflection film and a signal light total reflection film.

3. The monolithically constructed eye-safe laser of claim 1, wherein: the Q-switched crystal adopts Cr: YAG saturable absorption crystal.

4. The monolithically constructed eye-safe laser of claim 1, wherein: the pumping module adopts a multi-wavelength combined LD module or a single-wavelength LD module.