CN102025097A - Electro-optic frequency modulation single-frequency short-cavity laser for improving laser efficiency - Google Patents
Electro-optic frequency modulation single-frequency short-cavity laser for improving laser efficiency Download PDFInfo
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- CN102025097A CN102025097A CN 201010533859 CN201010533859A CN102025097A CN 102025097 A CN102025097 A CN 102025097A CN 201010533859 CN201010533859 CN 201010533859 CN 201010533859 A CN201010533859 A CN 201010533859A CN 102025097 A CN102025097 A CN 102025097A
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Abstract
The invention discloses an electro-optic frequency modulation single-frequency short-cavity laser for improving laser efficiency, which at least comprises a pumping source, a laser gain medium, an electro-optic crystal, a rear cavity membrane, an output membrane and an electrode. In the invention, the refractive index of the electro-optic crystal is changed through changing the voltage applied to the electrode so as to ensure that the optical path length of a resonant cavity is changed, and the laser frequency is modulated. The invention proposes the scheme that the gain medium and the electro-optic crystal are subjected to optical cement, i.e. Van der Waals force of molecules on the surfaces of the gain medium and the electro-optic crystal attracts each other together, thereby the problem of the traditional cementing laser that a cement layer absorbs laser to cause that the laser efficiency is reduced is solved, and the laser efficiency can be obviously improved. After the optical cement is used, the defect of sensitivity of the cement layer refractive index to temperature is overcome, which is beneficial to improving the stability of the resonant cavity so as to improve the laser frequency and the power stability. The invention adopts an electro-optic frequency modulation mode and has the advantage of wide frequency responsive band width.
Description
Technical field
The present invention relates to the laser technique field, be specifically related to a kind of single-frequency short cavity laser that improves the electrooptic frequency modulation of lasing efficiency.
Background technology
Short cavity laser has the big characteristics of longitudinal mode spacing, can play the effect that suppresses limit mould starting of oscillation, is easy to obtain single-frequency output.The mode of frequency regulation that short cavity laser adopts usually comprises temperature frequency modulation, piezoelectricity frequency modulation and electrooptic frequency modulation.Temperature frequency modulation has the wide advantage of tuning range, but because temperature changing speed is slow, makes that frequency change speed is slow, and promptly frequency response bandwidth is narrow, can only reach about 1Hz.Compare with electrooptic frequency modulation, piezoelectricity frequency modulation has the lower advantage of driving voltage, but frequency response bandwidth is subject to the responsive bandwidth of piezoelectric ceramic, generally in 100kHz.Though the electrooptic frequency modulation driving voltage is higher, the present the wideest mode of frequency regulation of responsive bandwidth.
People such as J.J.Zayhowski have carried out the electric light frequency modulation(FM) of Nd:YAG short cavity laser.Laser is by gain media Nd:YAG and electrooptic crystal LiTaO
3Gummed forms.Electrode is plated in LiTaO
3Two relative sides on, direction of an electric field is perpendicular to the resonant cavity optical axis.By changing applied voltage, change LiTaO
3Refractive index, thus realize the laser frequency modulation.Laser output power is 10mW, the lasing efficiency ratio of pump power (power output with) is 5%, frequency response bandwidth reaches 1MHz, modulation frequency range is 6GHz, the frequency modulation(FM) coefficient is a 14MHz/V (list of references: J.J.Zayhowski, P.A.Schulz, C.Dill III, and S.R.Henion, Diode-pumped composite-cavity electrooptically tuned microchip laser, IEEE Photonics Technology Letters, Vol.5, p1153-1155).
When laser crystal and electrooptic crystal adopted the gummed mode to be connected, there was sink effect in glue-line in laser optical path and to laser, thereby has reduced lasing efficiency, and the laser damage threshold of optical cement is very low, has limited the power output of laser.If adopt discrete element structure, promptly replace optical cement with air, then be difficult to avoid the influence of air-flow to laser frequency, simultaneously, mechanical oscillation also can aggravate the influence of laser frequency.
Summary of the invention
Problem to be solved by this invention is: how a kind of single-frequency short cavity laser that improves the electrooptic frequency modulation of lasing efficiency is provided, this laser can overcome the defective of prior art, have that frequency response bandwidth is wide, volume is little, in light weight, simple in structure, advantage that cost is low, can be applicable to fields such as coherent laser communication, coherent laser detection, Fibre Optical Sensor, adaptive optics, gravitational wave detection, the time and frequency standards.
Technical problem proposed by the invention is to solve like this: a kind of single-frequency short cavity laser that improves the electrooptic frequency modulation of lasing efficiency is provided, it is characterized in that:
1. comprise pumping source, gain medium, electrooptic crystal, back cavity film, output film and electrode;
2. described gain medium and electrooptic crystal optical cement form composite crystal, the back cavity film is arranged on the input end face of described composite crystal, and is anti-to the laser light wave height, anti-reflection to pumping wavelength, described output film is arranged in the output face of composite crystal, optical maser wavelength is had the transmitance of setting;
3. described composite crystal places between two plate electrodes, and the logical light end face of composite crystal is vertical with direction of an electric field or parallel.
Single-frequency short cavity laser according to the electrooptic frequency modulation of raising lasing efficiency provided by the present invention is characterized in that, the pump light that described pumping source sends is directly or by incident laser gain media behind the coupling device.
Single-frequency short cavity laser according to the electrooptic frequency modulation of raising lasing efficiency provided by the present invention is characterized in that described output film is the optical thin film that a kind of reflectivity radially changes.
Single-frequency short cavity laser according to the electrooptic frequency modulation of raising lasing efficiency provided by the present invention is characterized in that the transmitance of described setting is 0.01%-90%.
The present invention proposes gain media and electrooptic crystal are carried out optical cement, the Robert Van de Walle power of promptly utilizing the surface both molecule is with both adhesives, avoided in traditional gummed laser can significantly improving lasing efficiency owing to glue-line descends to the lasing efficiency that the absorption of laser causes.After using optical cement instead, overcome the thermally sensitive shortcoming of glue-line refractive index, helped improving the resonant cavity thermal stability, thereby improved laser frequency and power stability.The present invention adopts the electrooptic frequency modulation mode, has the wide advantage of frequency response bandwidth.
Description of drawings
Fig. 1 is the structural representation of first embodiment of single-frequency short cavity laser of the electrooptic frequency modulation of raising lasing efficiency provided by the invention, and (a) figure is the laser front view, and (b) figure is a gain media input end face structural representation;
Fig. 2 is the structural representation of second embodiment of single-frequency short cavity laser of the electrooptic frequency modulation of raising lasing efficiency provided by the invention.
Wherein, the 1-semiconductor laser, the 2-coupled fiber, the 3-pump light, the 4-coupled lens, the 5-electrode, 6-back cavity film, the 7-gain medium, the 8-electrooptic crystal, 9-exports film, and 10-exports laser, 11-pump spot.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described:
The present invention contains at least: pumping source, gain medium, electrooptic crystal, back cavity film, output film, electrode; The pump light that pumping source sends can be direct, or by incident laser gain media behind the coupling device; Gain medium and electrooptic crystal optical cement form composite crystal; The back cavity film is plated on the input end face of composite crystal, and laser wave is grown tall instead, and is anti-reflection to pumping wavelength; The output film is plated on the output end face of composite crystal, optical maser wavelength is had the transmitance of setting; Composite crystal places between two plate electrodes, and the logical light end face of composite crystal is vertical with direction of an electric field.
Described electrode can be positioned at the side of composite crystal, and direction of an electric field is parallel with the logical light end face of composite crystal.
Described output film can be the optical thin film that a kind of reflectivity radially changes.
Fig. 1 is first embodiment of single-frequency short cavity laser of the electrooptic frequency modulation of raising lasing efficiency provided by the invention.The pump light 3 that semiconductor laser 1 is sent, after coupled fiber 2 transmission and coupled lens 4 convergences, incident laser gain media 7, gain medium 7 forms composite crystal with electrooptic crystal 8 optical cements, and back cavity film 6 is plated on the input end face of composite crystal, and is anti-reflection to pumping wavelength, laser wave is grown tall instead, output film 9 is plated on the output end face of composite crystal, and optical maser wavelength is had the transmitance of setting, and the transmitance of described setting is 0.01%-90%.Composite crystal places between two plate electrodes 5, and the logical light end face of composite crystal is vertical with direction of an electric field.
In first embodiment, under to the less demanding situation of the pump power density in the gain medium 7, the pump light 3 of semiconductor laser 1 emission can directly incident laser gain medium 7.Output film 9 can be the optical thin film that a kind of reflectivity radially changes, and in the hot spot distribution, when foveal reflex rate height, when the edge reflections rate is hanged down, can play the effect of improving beam quality.
In first embodiment, be added in voltage on the electrode 5 by change, the field intensity in the electrooptic crystal 8 change, and cause the variations in refractive index of electrooptic crystal 8, make the resonant cavity optical path length variation, thereby realize the modulation to laser frequency.Compare with other mode of frequency regulations, electrooptic frequency modulation has the wide advantage of frequency response bandwidth.After replacing gummed with optical cement, avoided because glue-line to the lasing efficiency decline that the absorption of laser causes, can significantly improve lasing efficiency; And overcome the thermally sensitive shortcoming of glue-line refractive index, help improving the resonant cavity thermal stability, thereby improve laser frequency and power stability.
(b) figure is the gain media input end face structural representation of first embodiment, and there is a circular hole at the center of electrode 5, and its diameter is more than the twice of the diameter of pump spot 13 on the composite crystal input end face, to avoid blocking pump light 3.Generally, pump spot 13 is more bigger than laser facula, so the circular hole on the electrode can not cause laser diffraction.On the composite crystal output end face, also there is a circular hole at the center of electrode 5, and its diameter is consistent with the circular hole on the input end face, to avoid laser diffraction.
Fig. 2 is second embodiment of single-frequency short cavity laser of the electrooptic frequency modulation of raising lasing efficiency provided by the invention, its basic structure and first embodiment are similar, the main distinction is the side that electrode 5 is positioned at composite crystal, and direction of an electric field is parallel to the logical light end face of composite crystal.Be added in voltage on the electrode 5 by change, change the refractive index of electrooptic crystal 8, thereby realize the laser frequency modulation.
Claims (4)
1. single-frequency short cavity laser that improves the electrooptic frequency modulation of laser frequency is characterized in that:
1. comprise pumping source, gain medium, electrooptic crystal, back cavity film, output film and electrode;
2. described gain medium and electrooptic crystal optical cement form composite crystal, the back cavity film is arranged on the input end face of described composite crystal, and laser wave is grown tall instead, and is anti-reflection to pumping wavelength, described output film is arranged in the output face of composite crystal, optical maser wavelength is had the transmitance of setting;
3. described composite crystal places between two plate electrodes, and the logical light end face of composite crystal is vertical with direction of an electric field or parallel.
2. the single-frequency short cavity laser of electrooptic frequency modulation according to claim 1 is characterized in that, the pump light that described pumping source sends is directly or by incident laser gain media behind the coupling device.
3. the single-frequency short cavity laser of the electrooptic frequency modulation of raising laser frequency according to claim 1 is characterized in that, described output film is the optical thin film that a kind of reflectivity radially changes.
4. the single-frequency short cavity laser of the electrooptic frequency modulation of raising lasing efficiency according to claim 1 is characterized in that, the transmitance of described setting is 0.01%-90%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199430A (en) * | 2013-03-20 | 2013-07-10 | 厦门大学 | Frequency doubling self-regulating Q green laser inside double-doped chrome yttrium aluminum garnet composite photassium titanyl phosphate cavity |
| CN111505842A (en) * | 2020-04-30 | 2020-08-07 | 温州激光与光电子协同创新中心 | Passive optical sensitive device for improving laser power stability and implementation and test method thereof |
| CN113078547A (en) * | 2021-03-30 | 2021-07-06 | 电子科技大学 | Single-frequency high-power tunable short-cavity laser |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101005189A (en) * | 2006-12-05 | 2007-07-25 | 上海艾敦光电子材料有限公司 | Micro sheet structure blue light laser |
-
2010
- 2010-11-05 CN CN 201010533859 patent/CN102025097A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101005189A (en) * | 2006-12-05 | 2007-07-25 | 上海艾敦光电子材料有限公司 | Micro sheet structure blue light laser |
Non-Patent Citations (1)
| Title |
|---|
| 《IEEE PHOTONICS TECHNOLOGY LETTERS》 19931031 J.J.Zayhowski,et al. Diode-Pumped Composite-Cavity Electrooptically Tuned Microchip Laser P1153-1155 1-4 第5卷, 第10期 2 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199430A (en) * | 2013-03-20 | 2013-07-10 | 厦门大学 | Frequency doubling self-regulating Q green laser inside double-doped chrome yttrium aluminum garnet composite photassium titanyl phosphate cavity |
| CN111505842A (en) * | 2020-04-30 | 2020-08-07 | 温州激光与光电子协同创新中心 | Passive optical sensitive device for improving laser power stability and implementation and test method thereof |
| CN111505842B (en) * | 2020-04-30 | 2023-11-10 | 温州激光与光电子协同创新中心 | Passive photosensitive device for improving laser power stability and implementation and test method thereof |
| CN113078547A (en) * | 2021-03-30 | 2021-07-06 | 电子科技大学 | Single-frequency high-power tunable short-cavity laser |
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Application publication date: 20110420 |