CN215267057U

CN215267057U - Novel solid laser amplifier

Info

Publication number: CN215267057U
Application number: CN202121435797.XU
Authority: CN
Inventors: 缪龙; 郑广建; 林小强
Original assignee: Fuzhou Nafei Photoelectric Technology Co ltd
Current assignee: Fuzhou Nafei Photoelectric Technology Co ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2021-12-21
Anticipated expiration: 2031-06-25

Abstract

The utility model provides a novel solid laser amplifier, include the first holophote that is used for changing the light path direction through the collimator, polarization beam splitting prism, optical rotation ware, half wave plate, at least one-level that the light path connects gradually, the amplification module and the second holophote of at least one-level. The utility model provides a novel solid laser amplifier, signal light realizes energy amplification through one-level or multistage amplification module, and wherein the amplification module of each grade can both realize the amplification of four ranges, and signal light passes through the gain crystal four times, realizes signal light energy amplification four times, effectively improves the magnification, and need not increase too much lens, makes the regulation more simple and convenient, easy to realize; the signal light is incident on the gain crystal at a certain angle, and the primary incident plane of the laser of the gain crystal is an inclined plane with an angle of 1-2 degrees, so that the self-oscillation caused by overlarge gain can be effectively inhibited.

Description

Novel solid laser amplifier

Technical Field

The utility model relates to a laser field, in particular to novel solid laser amplifier.

Background

At present, the laser with pulse energy or peak power suitable for application can be generated directly by an oscillator or realized by combining a seed source with a laser pulse amplification scheme, the laser generated by the oscillator is generally low in pulse energy or peak power, and therefore the laser pulse amplification is required for application.

The existing solid laser amplifier is mostly applied to traveling wave amplification. To obtain high-energy pulsed laser light, multi-stage traveling wave amplification or multi-pass traveling wave amplification is required. The amplification system with more than two passes is realized by the isolation system, and due to the introduction of a plurality of isolation devices, the cost is higher, and self-oscillation is easy to generate when the gain is improved, so that the laser amplification efficiency is reduced; the optical path separation method is also used for realizing multi-pass amplification, the scheme realizes the multi-pass amplification through the refraction and reflection of a plurality of reflectors, and the slab amplifier can realize the multi-pass amplification, and has high debugging precision requirement and higher difficulty. The pumping and signal of the slab amplifier need to pass through a complicated shaping system, and the slab amplifier is difficult to popularize and use.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel solid laser amplifier has solved among the prior art solid laser amplifier's the structure complicacy, with high costs and the big defect of the regulation degree of difficulty.

The technical scheme of the utility model is realized like this:

a novel solid laser amplifier comprises a collimator, a polarization beam splitter prism, an optical rotator, a half-wave plate, at least one stage of first total reflector for changing the direction of a light path, at least one stage of amplification module and a second total reflector which are sequentially connected through the light path; the amplifying module comprises a gain crystal and a dichroic mirror which are sequentially connected through a light path, an included angle is formed between laser reflected to the gain crystal from the first total reflector and the gain crystal, the dichroic mirror is used for reflecting the laser transmitted through the gain crystal to enable the laser to pass through the gain crystal for the second time and then be transmitted to the next device, and the second total reflector is used for reflecting the laser back along the original path to enable the laser to be finally emitted from the polarization beam splitter prism; and a pumping means for providing laser energy to the gain crystal.

Further, the pumping device comprises a pumping source and a lens for shaping, and laser energy provided by the pumping source enters the gain crystal through the optical path through the lens and the dichroic mirror in sequence.

Further, the number of the lenses is two.

Further, the laser wavelength of the pump source is 808nm or 878 nm.

Further, the primary laser incident surface of the gain crystal is an inclined plane with an angle of 1-2 degrees.

Further, the number of the first total reflection mirrors is two.

Further, the amplifying module is a first stage.

Further, the gain crystal is Nd: YVO4 or Nd: YAG.

Further, the optical rotator is a free space optical rotator.

The utility model has the advantages that: the utility model provides a novel solid laser amplifier, signal light realizes energy amplification through one-level or multistage amplification module, and wherein the amplification module of each grade can both realize the amplification of four ranges, and signal light passes through the gain crystal four times, realizes signal light energy amplification four times, effectively improves the magnification, and need not increase too much lens, makes the regulation more simple and convenient, easy to realize; the signal light is incident on the gain crystal at a certain angle, and the primary incident plane of the laser of the gain crystal is an inclined plane with an angle of 1-2 degrees, so that the self-oscillation caused by overlarge gain can be effectively inhibited.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

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

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, a novel solid laser amplifier includes a collimator 1, a polarization splitting prism 2, an optical rotator 3, a half-wave plate 4, at least one stage of first total reflector 5 for changing the direction of the optical path, at least one stage of amplification module, and a second total reflector 9, which are sequentially connected through the optical path; the amplifying module comprises a gain crystal 7 and a dichroic mirror 8 which are sequentially connected through a light path, the laser reflected to the gain crystal from the first total reflector 5 forms an included angle with the gain crystal 7, the dichroic mirror 8 is used for reflecting the laser transmitted through the gain crystal 7 so that the laser passes through the gain crystal 7 for the second time and then is transmitted to the next device, and the second total reflector 9 is used for reflecting the laser back along the original path so that the laser is finally transmitted out of the polarization beam splitter prism 2; pumping means for supplying laser energy to the gain crystal 7 are also included.

The pumping device comprises a pumping source 12 and a lens 10 for shaping, and laser energy provided by the pumping source 12 enters the gain crystal 7 through an optical path through the lens 10 and the dichroic mirror 8 in sequence.

Wherein the number of the lenses 10 is two. The laser wavelength of the pump source 12 may be 808nm or 878nm, but is not limited to these two. The primary laser incident surface of the gain crystal 7 is an inclined surface with an angle of 1-2 degrees, and the right side surface is shown in fig. 1. The number of the first total reflection mirrors 5 is two, and other numbers can be selected according to requirements. The amplifying module is a first stage, and may be a second stage, a third stage, or a fourth stage. The gain crystal 7 is Nd: YVO4 or Nd: YAG, but not limited to both. The optical rotator 3 is a free space optical rotator.

The utility model discloses a working process and principle:

after being collimated by an optical fiber collimator 1, linear polarization seed signal light sequentially passes through a polarization beam splitter prism 2 for polarization, passes through an optical rotator 3, the polarization state is converted by 45 degrees, passes through a half wave plate 4, the polarization state is converted by 45 degrees, the original horizontal polarization state is maintained, the angle is changed through two first total reflectors 5, the signal light passes through a gain crystal 7 at a proper angle, the propagation direction is changed through a dichroic reflector 8 after being output, and the signal light passes through the crystal again to the next second total reflector 9; the signal light is reflected by the second total reflector 9 and returns along the original path, and then sequentially passes through the gain crystal 7, the dichroic reflector 8, the gain crystal 7, the two second total reflectors 5, the half-wave plate 4, the optical rotator and the polarization beam splitter prism 2 to be emitted, so that the signal light amplified in four paths is output, the amplification rate is effectively improved, excessive lenses are not required to be added, and the adjustment is simpler and more convenient and is easy to realize. Wherein, the laser energy emitted by the pump source 12 enters the gain crystal 7 through the dichroic mirror 8 after being shaped by the two lenses 10, and provides energy for the gain crystal 7. The dichroic mirror 8 is a device that reflects the input signal light but transmits the laser light of the pump source 12.

Since the signal light enters the gain crystal 7 with a certain angle, and the primary laser incident surface of the gain crystal 7 is an inclined surface with an angle of 1-2 degrees, namely the right side surface in fig. 1, the self-oscillation caused by overlarge gain can be effectively inhibited.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel solid-state laser amplifier is characterized in that:

the device comprises a collimator, a polarization beam splitter prism, an optical rotator, a half-wave plate, at least one stage of first total reflector for changing the direction of a light path, at least one stage of amplification module and a second total reflector which are sequentially connected through the light path;

the amplifying module comprises a gain crystal and a dichroic mirror which are sequentially connected through a light path, an included angle is formed between laser reflected to the gain crystal from the first total reflector and the gain crystal, the dichroic mirror is used for reflecting the laser transmitted through the gain crystal to enable the laser to pass through the gain crystal for the second time and then be transmitted to the next device, and the second total reflector is used for reflecting the laser back along the original path to enable the laser to be finally emitted from the polarization beam splitter prism; and a pumping means for providing laser energy to the gain crystal.

2. A novel solid state laser amplifier as defined in claim 1 wherein: the pumping device comprises a pumping source and a lens for shaping, and laser energy provided by the pumping source enters the gain crystal through an optical path sequentially through the lens and the dichroic mirror.

3. A novel solid state laser amplifier as defined in claim 2 wherein: the number of the lenses is two.

4. A novel solid state laser amplifier as defined in claim 3 wherein: the laser wavelength of the pump source is 808nm or 878 nm.

5. A novel solid state laser amplifier as defined in claim 1 wherein: the primary laser incident surface of the gain crystal is an inclined plane with an angle of 1-2 degrees.

6. A novel solid state laser amplifier as defined in claim 1 wherein: the number of the first total reflection mirrors is two.

7. A novel solid state laser amplifier as defined in claim 1 wherein: the amplifying module is a first stage.

8. A novel solid state laser amplifier as defined in claim 1 wherein: the gain crystal is Nd: YVO4 or Nd: YAG.

9. A novel solid state laser amplifier as defined in claim 1 wherein: the optical rotator is a free space optical rotator.