CN200956491Y

CN200956491Y - Ring cavity laser

Info

Publication number: CN200956491Y
Application number: CN 200620077542
Authority: CN
Inventors: 吴砺
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-09-19
Filing date: 2006-09-19
Publication date: 2007-10-03
Anticipated expiration: 2016-09-19

Abstract

The utility model discloses a ring cavity laser, a front wave plate, a front work-offcrystal, a rear crystal-off crystal and a rear save plate are connected in turn. The front work-off crystal and rear work-off crystal are arranged in optical axis relative manner; a laser gain medium, a 1 / 2 wave plate and a Faraday rotating lug are arranged between the front work-off crystal and rear work-off crystal, where the laser gain medium is positioned at lower part of the 1 / 2 wave plate and a Faraday rotating lug. The front work-off crystal, the 1 / 2 wave plate, the Faraday rotating lug, the rear work-off crystal, the rear wave plate and the laser gain medium from a annular cavity. The external end of the front wave plate is plated with a front cavity membrane; the external end of the rear wave plate is plated with a rear cavity membrane. The structure is very simple; the accuracy requirements are relatively low; and the manufacture cost is also low to ensure the oscillation function of the ring cavity laser at the same time.

Description

A kind of ring cavity laser

Technical field

The utility model relates to field of lasers, relates in particular to the ring cavity laser that adopts a pair of wave plate, a pair of Work-off crystal, gain medium, faraday's revolving fragment and 1/2 wave plate to constitute.

Background technology

The ring cavity laser is a kind of effective cavity configuration that produces low noise laser, traveling wave oscillation device as shown in Figure 1, form a rectangular cavity by the four sides mirror, a Brewster end face laser bar, λ/2 wave plates and a Faraday rotator constitute, for reflector laser wavelength to greatest extent, there is three mirror contact lens to plate reflectance coating, the fourth face mirror is the part transmission, half-wave plate and Faraday rotator form unidirectional smooth casket, have a glass bar to be in the axial magnetic field of solenoid coil generation in the Faraday rotator.This structure is because element is too much, and structure is too complicated, and manufacturing cost is too high, so fail to be widely used always.

Summary of the invention

The purpose of this utility model provides a kind of ring cavity laser of simple in structure, low cost of manufacture.

The utility model is to be achieved through the following technical solutions: it comprises a LD light source, one collimation condenser lens, one faraday's revolving fragment and one 1/2 wave plates, wave plate before other has one, one back wave plate, work-off crystal before one, one back work-off crystal, one gain medium, one magnet, preceding wave plate, preceding work-off crystal, back work-off crystal, back wave plate links to each other in regular turn, preceding work-off crystal is placed with back its optical axis relative mode of work-off crystal by adopting, gain medium, 1/2 wave plate and faraday's revolving fragment are located between preceding work-off crystal and the back work-off crystal, wherein gain medium is positioned at the below of 1/2 wave plate and faraday's revolving fragment, preceding wave plate, preceding work-off crystal, 1/2 wave plate, faraday's revolving fragment, back work-off crystal, back wave plate and gain medium form annular chamber, magnet is positioned at the annular chamber top, the outer face of preceding wave plate is coated with the ante-chamber rete, and the outer face of back wave plate is coated with the back cavity rete.

Adopt formed ring cavity after the above structure, can guarantee the oscillation functions of ring cavity laser, can realize the laser output of fundamental wave, this structure is very simple, and it is lower that it makes required precision, so manufacturing cost is also lower.

For realizing the laser output of frequency doubled light, the utility model can be located at a frequency-doubling crystal and a wave plate between gain medium and the rear prism in regular turn.

Current Work-off crystal is placed with back its optical axis mode of being parallel to each other of Work-off crystal by adopting, and the utility model can be placed one 1/2 wave plates between gain medium and back Work-off crystal.

The utility model is according to actual conditions, and this gain medium also can be located between preceding wave plate and the preceding Work-off crystal.

The utility model is according to actual conditions, and this ante-chamber rete also can be the ante-chamber sheet of being located at preceding wave plate outer face, and this back cavity rete also can be the back cavity sheet of being located at wave plate outer face, back.

Work-off crystal before of the present utility model, back Work-off crystal also available a pair of PBS prism, a pair of crystal prism, crystal prism and glass prism, a pair of Rochon prism, a Lars, a pair of room pause prism or Rochon prism and optical prism replacement can reach same effect.

Space size according to the placement position, can be that separate type is placed between each optical component of the present utility model, maybe can be that the part optical component is that separate type is placed, the end face of part adjacent optical components and parts is to bond together, maybe can be that all optical components are bonded to a microplate, this bonding mode be the mode that adopts glue, optical cement or in-depth optical cement gummed.

Description of drawings

Now in conjunction with the accompanying drawings the utility model is further elaborated:

Fig. 1 is the optical texture schematic diagram of existing traveling wave oscillation device;

Fig. 2 is the optical texture schematic diagram of one of the utility model embodiment;

Fig. 3 is two the optical texture schematic diagram of the utility model embodiment;

Fig. 4 is three the optical texture schematic diagram of the utility model embodiment;

Fig. 5 is four the optical texture schematic diagram of the utility model embodiment;

Fig. 6 is five the optical texture schematic diagram of the utility model embodiment;

Fig. 7 is six the optical texture schematic diagram of the utility model embodiment;

Fig. 8 is the light path schematic diagram of the crystal prism of Work-off crystal of the present utility model when being a pair of crystal prism;

Fig. 9 be Work-off crystal of the present utility model when being crystal prism and glass prism crystal prism and the light path schematic diagram of glass prism;

Figure 10 is the optical texture schematic diagrames of all optical components of the utility model when being bonded to a microplate.

Embodiment

The utility model as shown in Figure 2, it comprises LD light source 101, collimation condenser lens 102,103, preceding wave plate 104, back wave plate 108, preceding Work-off crystal 105, back Work-off crystal 107, gain medium 106, faraday's revolving fragment 109,1/2 wave plate 110 and magnet 111, preceding wave plate 104, preceding work-off crystal 105, back work-off crystal 107, back wave plate 108 links to each other in regular turn, preceding work-off crystal 105 adopts its optical axis relative modes to place with back work-off crystal 107, gain medium 106,1/2 wave plate 110 and faraday revolving fragment 109 are located between preceding work-off crystal 105 and the back work-off crystal 107, wherein gain medium 106 is positioned at 1/2 wave plate 110 and faraday revolving fragment 109 belows, preceding wave plate 104, preceding work-off crystal 105,1/2 wave plate 110, faraday's revolving fragment 109, back work-off crystal 107, back wave plate 108, gain medium 106 forms annular chamber, magnet 111 is positioned at the annular chamber top, the outer face of preceding wave plate 104 is coated with ante-chamber rete 112, and the outer face of back wave plate 108 is coated with back cavity rete 113.

Preceding wave plate 104 relative pump light wavelength are full-wave plate, laser oscillation wavelength is a quarter wave plate relatively, the optical axis projection angle at 45 of the optical direction of its optical axis and preceding work-off crystal 105, back wave plate 108 relative fundamental wavelengths are quarter wave plate, the optical axis projection angle at 45 of the optical direction of its optical axis and back work-off crystal 107, the effect of preceding wave plate 104, back wave plate 108 all is to become e light after first-harmonic incident light O light is reflected back, or e light is become O light; Before work-off crystal 105 and back work-off crystal 107 optical axises at grade, ante-chamber rete 112 is anti-reflection to fundamental wave high-reflecting film layer to pump light, back cavity rete 113 is to fundamental wave part transmission rete; Faraday's revolving fragment 109 singles are θ by the anglec of rotation, then the optical axis projection angle of the optical axis of 1/2 wave plate 110 and preceding work-off crystal 105 optical directions is θ/2, when guaranteeing light so counterclockwise by faraday's revolving fragment 109,1/2 wave plate 110, the polarization direction remains unchanged, and light is when being the up time direction, and then the polarization direction rotates 2 θ, after light arrives back work-off crystal 107 like this, to be decomposed into O light and e light, wherein O light light intensity component is total Sin ²θ, promptly each circulation loss light intensity is the Sin of total light intensity ²θ.Draw thus be rotated counterclockwise laser can starting of oscillation, can not starting of oscillation and turn clockwise, thus realize the vibration of little shape ring cavity laser, realize the laser output of the circulator laser of fundamental wave.

The utility model also can be located at a frequency-doubling crystal 114 and a wave plate 115 between gain medium 106 and the back work-off crystal 107 as shown in Figure 3 in regular turn, forms the laser cavity structure of output frequency doubled light.Wave plate 115 relative fundamental wavelengths are full-wave plate, and frequency doubled light is 1/2 wave plate relatively, and back cavity rete 113 is at this moment high anti-to first-harmonic, to the frequency doubled light antireflective coating.When frequency-doubling crystal 114 was I class phase-matching crystals, wave plate 115 optical axises were at 45 with the optical axis projection of back work-off crystal 107 optical directions, or do not establish wave plate 115 when light path, and then frequency doubled light is exported by the 107 below transmissions of back work-off crystal with e light; When frequency-doubling crystal 114 was II class phase-matching crystals, wave plate 115 was 22.5 ° or 67.5 ° with the incident light direction optical axis projection angle of back work-off crystal 107, can make frequency-doubling crystal 114 respectively with O light or e light output frequency doubled light.

The utility model also can be as shown in Figure 4, sets up 1/2 wave plate 116 of a relative fundamental wave between gain medium 106 and back work-off crystal 107.

The utility model also can be as shown in Figure 5, and this gain medium 106 is located between preceding wave plate 104 and the preceding work-off crystal 105.

The utility model also can be as shown in Figure 6, and this ante-chamber rete 112 is the ante-chamber sheet 117 of wave plate 104 outer faces before being located at, and this back cavity rete 113 is for being located at the back cavity sheet 118 of wave plate 108 outer faces, back.

The utility model also can be as shown in Figure 7, work-off crystal 105, back work-off crystal 107 are replaced by a pair of PBS prism 119,120 before being somebody's turn to do, in like manner, it also can be a pair of crystal prism, crystal prism and glass prism, a pair of Rochon prism, a Lars, a pair of room pause prism or Rochon prism and optical prism.It is the light path schematic diagram of 121,122 o'clock crystal prism of a pair of crystal prism that Fig. 8 is; Fig. 9 promptly is the crystal prism during with glass prism 123 and the light path schematic diagram of glass prism for crystal prism 121.

Can be that separate type is placed between each optical component of the present utility model, also can be as Fig. 2～shown in Figure 9, the part optical component is that separate type is placed, the end face of part adjacent optical components and parts is to bond together, also can be as shown in figure 10, all optical components are bonded to a microplate, and this bonding mode is the mode that adopts glue, optical cement or in-depth optical cement gummed.

The utility model can also adopt a pair of reducing and expansion bundle telescope to make that one section light beam attenuates in the chamber, constitutes isolator in order to use the less work-off crystal of size.

Claims

1, a kind of ring cavity laser, comprise a LD light source, one collimation condenser lens, one faraday's revolving fragment and one 1/2 wave plates, it is characterized in that: wave plate before other has, one back wave plate, work-off crystal before one, one back work-off crystal, one gain medium, one magnet, preceding wave plate, preceding work-off crystal, back work-off crystal, back wave plate links to each other in regular turn, preceding work-off crystal is placed with back its optical axis relative mode of work-off crystal by adopting, gain medium, 1/2 wave plate and faraday's revolving fragment are located between preceding work-off crystal and the back work-off crystal, wherein gain medium is positioned at the below of 1/2 wave plate and faraday's revolving fragment, preceding wave plate, preceding work-off crystal, 1/2 wave plate, faraday's revolving fragment, back work-off crystal, back wave plate and gain medium form annular chamber, magnet is positioned at the annular chamber top, the outer face of preceding wave plate is coated with the ante-chamber rete, and the outer face of back wave plate is coated with the back cavity rete.

2, a kind of ring cavity laser according to claim 1 is characterized in that: a frequency-doubling crystal and a wave plate are located between gain medium and the back work-off crystal in regular turn.

3, a kind of annular cavity laser according to claim 1 is characterized in that: preceding work-off crystal is placed with back its optical axis mode of being parallel to each other of work-off crystal by adopting, places one 1/2 wave plates between gain medium and rear prism.

4, a kind of annular cavity laser according to claim 1 is characterized in that: this gain medium is located between preceding wave plate and the preceding work-off crystal.

5, according to the described a kind of annular cavity laser of one of claim 1 to 4, it is characterized in that: this ante-chamber rete is the ante-chamber sheet of wave plate outer face before being located at, and this back cavity rete is a back cavity sheet of being located at wave plate outer face, back.

6, according to the described a kind of annular cavity laser of one of claim 1 to 4, it is characterized in that: this preceding work-off crystal, back work-off crystal are by a pair of PBS prism, a pair of crystal prism, crystal prism and glass prism, a pair of Rochon prism, a Lars, a pair of room pause prism or Rochon prism and optical prism replacement.

7, a kind of ring cavity laser according to claim 5 is characterized in that: this preceding work-off crystal, back work-off crystal are by a pair of PBS prism, a pair of crystal prism, crystal prism and glass prism, a pair of Rochon prism, a Lars, a pair of room pause prism or Rochon prism and optical prism replacement.

8, according to the described a kind of ring cavity laser of one of claim 1 to 4, it is characterized in that: be that separate type is placed between each optical component, or the part optical component is that separate type is placed, the end face of part adjacent optical components and parts is to bond together, or all optical components are bonded to a microplate, and this bonding mode is the mode that adopts glue, optical cement or in-depth optical cement gummed.

9, a kind of ring cavity laser according to claim 5, it is characterized in that: be that separate type is placed between each optical component, or the part optical component is that separate type is placed, the end face of part adjacent optical components and parts is to bond together, or all optical components are bonded to a microplate, and this bonding mode is the mode that adopts glue, optical cement or in-depth optical cement gummed.