CN114520458B - Device and method for switching output continuous light and pulse light - Google Patents

Device and method for switching output continuous light and pulse light Download PDF

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CN114520458B
CN114520458B CN202210066093.2A CN202210066093A CN114520458B CN 114520458 B CN114520458 B CN 114520458B CN 202210066093 A CN202210066093 A CN 202210066093A CN 114520458 B CN114520458 B CN 114520458B
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mirror
laser
polarized light
optical switch
optical
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CN114520458A (en
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李立
白冰
高正欣
王宝库
许祺峰
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Harbin Engineering University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10061—Polarization control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
    • H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
    • H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

The invention discloses a device and a method for switching and outputting continuous light and pulse light, which consists of a folding laser cavity and self-injection, wherein the device and the method sequentially comprise a 1.9 mu m horizontal linear polarization continuous light laser, a first optical switch, a resonant cavity input cavity mirror, a Brewster mirror, a Ho, an LLF laser crystal, a 2 mu m semi-transmission half mirror, a half wave plate, a first total reflection mirror, a second optical switch, a second total reflection mirror, an optical delay device, a third total reflection mirror, a first optical attenuator and a resonant cavity output coupling mirror; the invention can realize the switching of the linear polarized continuous laser and the pulse laser by a single laser, and reduce the cost of laser devices. The accurate signal control master switch can realize accurate real-time switching of continuous laser and pulse laser, and can be automatically adjusted according to requirements. The invention can respectively output two beams of laser beams with mutually vertical polarization, and can be switched between continuous horizontal light and pulse vertical light at any time according to requirements.

Description

Device and method for switching output continuous light and pulse light
Technical Field
The invention belongs to the technical field of laser, relates to a device and a method for switching and outputting continuous light and pulse light, and in particular relates to a device and a method for switching and outputting continuous light and pulse light based on self-injection.
Background
The continuous laser can output laser for a long time, and can be widely applied to the fields of laser communication, laser surgery and the like. Although the pulse laser can work at certain time intervals, the pulse laser has larger output power and peak power, and can be widely applied to the fields of laser marking, cutting, ranging and the like. It follows that continuous lasers and pulsed lasers play a great role in the domestic field. At present, a solid laser, an optical fiber laser, a semiconductor laser and the like are easy to realize high-power continuous laser, and on the basis, a Q-switching technology (such as active Q-switching technology, passive Q-switching technology and the like) is adopted, so that giant pulses can be generated, but the real-time switching of continuous laser and pulse laser for a single laser is very rare.
The laser with the wave band of 2 mu m is not only positioned in a low-loss window of atmospheric light transmission, but also can be applied to light sources of coherent Doppler wind-finding radar and laser radar systems. In addition to OH - The laser has strong absorption in the wave band, and the thermal effect of the laser can lead human tissues to be vaporized to generate a coagulation effect, so the laser can be used as a surgical knife to be applied to the laser medical field. However, according to different application scenarios, the 2 μm band laser needs to be switched between continuous wave and pulse in real time.
Current research for continuous light and pulsed laser switching has begun. Tm doped with switchable continuous and pulse 3+ In research of fiber laser seed source, tm doping is proposed 3+ The switching between the two lasers is carried out by adopting an acousto-optic Q-switching mode in the fiber laser seed source system, namely, the Tm is doped 3+ An acousto-optic Q-switch is added into a resonant cavity of the fiber laser. O.Antipov et al adopts an acousto-optic Q-switched mode, utilizes a Raman displacement erbium fiber laser to pump TM at 1670nm, lu2O3 to realize high-efficiency laser oscillation, and realizes continuous wave and active Q-switched oscillation in high-quality light beams [ high effective 2 mu m CW and Q-switched Tm ] 3+ :Lu 2 O 3 ceramics lasers in-band pumped by a Raman-shifted erbium fiber laser at 1670nm]However, these studies are only studies on pulse and continuous laser switching of the fiber laser, and switching cannot be instantaneously completed due to a long laser switching time.
Until now, in order to realize polarization output of a solid laser, a polarizing plate, a double-brewster mirror or other polarizing devices are generally adopted, but only single polarization state output can be realized, or after light is split by a light splitting prism on the basis, different polarization state outputs are realized, and the light splitting can reduce light power and complicate a light path, for example, a polarization controller, a polarizer, a beam splitter or other devices are adopted in a control stabilization method of a laser polarization state control stabilization device with the patent number of CN2016611253656. X, so that cost is increased, loss of light power of the devices is added, and complexity of the light path is increased. If the polarization state is switched by using a polarization switch, however, there is a time delay in the switching process, which greatly aggravates the phase instability and greatly reduces the polarization characteristic of the laser.
Disclosure of Invention
Aiming at the prior art, the technical problem to be solved by the invention is to provide a device and a method for switching and outputting continuous light and pulse light based on self-injection, which effectively simplify the device, reduce the device cost and realize accurate real-time switching of continuous laser and pulse laser.
In order to solve the technical problems, the device for switching and outputting continuous light and pulse light comprises a 1.9 mu m horizontal linear polarization continuous light laser, a first optical switch, a resonant cavity input cavity mirror, a Brewster mirror and a Ho, wherein the LLF laser crystal, a 2 mu m semi-transmission half mirror, a first total mirror, a second optical switch, a second total mirror, a light delay device, a third total mirror, an optical attenuator, a resonant cavity output coupling mirror, a half wave plate and a signal control total switch; the signal control master switch controls the first optical switch, the second optical switch, the optical delay device and the optical attenuator;
when the signal control master switch controls the first optical switch to be closed and the second optical switch to be opened, horizontal linear polarized light generated by the 1.9 mu m horizontal linear polarized continuous optical laser enters the resonant cavity input cavity mirror through the first optical switch, the 1.9 mu m horizontal linear polarized light provides pumping energy for the Ho: LLF laser crystal through the Brewster mirror, the pumping power of the pumping source is controlled, the 1.9 mu m horizontal linear polarized light generates 2 mu m horizontal linear polarized light through the Ho: LLF laser crystal, the 2 mu m horizontal linear polarized light is reflected to the resonant cavity output coupling mirror through the 2 mu m semi-transparent half mirror, and then continuous horizontal polarized laser is output;
when the signal control master switch controls the first optical switch to be firstly opened and then to be simultaneously closed with the second optical switch, 2 mu m horizontal polarized light transmitted by the 2 mu m semi-transmission half mirror is converted into vertical linear polarized light through the half-wave plate and is reflected to the second optical switch through the first total reflection mirror, and when the second optical switch is closed, the 2 mu m vertical linear polarized light sequentially passes through the second total reflection mirror, the optical delay device, the third total reflection mirror, the optical attenuator and the Brewster mirror, and the Brewster mirror reflects the 2 mu m vertical linear polarized light to the Ho: LLF laser crystal and outputs pulse laser in a vertical polarization state through the 2 mu m semi-transmission half mirror.
Further, a transverse electro-optic modulation crystal is arranged behind the resonant cavity output coupling mirror, and when the transverse electro-optic modulation crystal does not apply transverse half-wave voltage, the output laser is continuous horizontal polarized light or pulse vertical polarized light; when the transverse electro-optic modulation crystal applies transverse half-wave voltage, the output laser continuously vertically polarizes light or pulse horizontally polarizes light.
The invention also comprises a device for switching and outputting continuous light and pulse light, which comprises a 1.9 mu m horizontal linear polarization continuous light laser, a first optical switch, a resonant cavity input cavity mirror, a Brewster mirror, a Ho: LLF laser crystal, a 2 mu m semi-transmission half mirror, a first lithium niobate crystal, a second 2 mu m semi-transmission half mirror, a second lithium niobate crystal, a second optical switch, a second total mirror, an optical delay device, a third total mirror, an optical attenuator, a resonant cavity output coupling mirror and a signal control total switch; the signal control master switch controls the first optical switch, the second optical switch, the optical delay device and the optical attenuator;
when the signal control master switch controls the first optical switch to be closed and the second optical switch to be opened, horizontal linear polarized light generated by the 1.9 mu m horizontal linear polarized continuous optical laser enters the resonant cavity input cavity mirror through the first optical switch, the 1.9 mu m horizontal linear polarized light provides pumping energy for the Ho for the LLF laser crystal through the Brewster mirror, and the 1.9 mu m horizontal linear polarized light generates 2 mu m horizontal linear polarized light through the Ho for the LLF laser crystal through controlling the pumping power of the pumping source; when the 2 mu m horizontal polarized light is reflected to the resonant cavity output coupling mirror through the 2 mu m semi-transmission half reflecting mirror, outputting 2 mu m continuous horizontal polarized laser; when 2 mu m horizontal polarized light is transmitted to the first lithium niobate crystal through the 2 mu m semi-transmission half mirror, and transverse half-wave voltage is applied to the first lithium niobate crystal, 2 mu m continuous horizontal polarized light is changed into 2 mu m continuous vertical polarized light, and the 2 mu m continuous vertical polarized light is output from the second 2 mu m semi-transmission half mirror;
when the signal control master switch controls the first optical switch to be firstly opened and then simultaneously closed with the second optical switch, 2 mu m horizontal linearly polarized light transmitted by the first 2 mu m semi-transmission half mirror is reflected to the second lithium niobate crystal through the first lithium niobate crystal and the second 2 mu m semi-transmission half mirror which are not subjected to voltage, transverse half-wave voltage is applied to the second lithium niobate crystal, 2 mu m horizontal linearly polarized light is changed into 2 mu m vertical linearly polarized light, the 2 mu m vertical linearly polarized light sequentially passes through the closed second optical switch, the second total mirror, the optical delay device, the third total mirror, the optical attenuator and the Brewster mirror, the Brewster mirror reflects the 2 mu m vertical linearly polarized light to the Ho: LLF laser crystal, and when the 2 mu m vertical linearly polarized light is reflected to the resonant cavity output coupling mirror through the 2 mu m semi-transmission half mirror, 2 mu m pulse vertical polarized laser is output; when 2 μm vertical polarized light is transmitted to the first lithium niobate crystal by the 2 μm half-transmitting half mirror, and a transverse half-wave voltage is applied to the first lithium niobate crystal, 2 μm pulse vertical polarized light is changed into 2 μm pulse horizontal polarized light, which is output from the second 2 μm half-transmitting half mirror.
The method for switching and outputting continuous light and pulse light by adopting a first device is characterized in that a signal control master switch controls a first optical switch (2) to be closed, a second optical switch to be opened, horizontal linear polarized light generated by a 1.9 mu m horizontal linear polarization continuous light laser enters a resonant cavity input cavity mirror through the first optical switch, 1.9 mu m horizontal linear polarized light provides pumping energy for a Ho through a Brewster mirror, the pumping power of a pumping source is controlled, 1.9 mu m horizontal linear polarized light is enabled to generate 2 mu m horizontal linear polarized light through the Ho, the 2 mu m horizontal linear polarized light is reflected to a resonant cavity output coupling mirror through a 2 mu m semi-transmission half mirror, and continuous horizontal polarized laser is output;
the signal control master switch controls the first optical switch to be firstly opened and then to be simultaneously closed with the second optical switch, 2 mu m horizontal linear polarized light transmitted by the 2 mu m semi-transmission half mirror is converted into vertical linear polarized light through the half-wave plate and is reflected to the second optical switch through the first total reflection mirror, when the second optical switch is closed, the 2 mu m vertical linear polarized light sequentially passes through the second total reflection mirror, the optical delay device, the third total reflection mirror, the optical attenuator and the Brewster mirror, the Brewster mirror reflects the 2 mu m vertical linear polarized light to the Ho: LLF laser crystal, and pulse laser in a vertical polarization state is output through the 2 mu m semi-transmission half mirror.
The method for switching and outputting continuous light and pulse light by adopting a second device is characterized in that a signal control master switch is used for controlling a first optical switch to be closed and a second optical switch to be opened, horizontal linear polarized light generated by a 1.9 mu m horizontal linear polarization continuous light laser enters a resonant cavity input cavity mirror through the first optical switch, 1.9 mu m horizontal linear polarized light is provided with pumping energy for Ho by a Brewster mirror, the pumping power of a pumping source is controlled to enable the 1.9 mu m horizontal linear polarized light to be generated by the Ho by the LLF laser crystal, the 2 mu m horizontal linear polarized light is reflected to a resonant cavity output coupling mirror through a 2 mu m semi-transparent half-mirror, and continuous horizontal polarized laser is output when transverse half-wave voltage is not applied by a transverse electro-optic modulation crystal; when a transverse electro-optic modulation crystal applies a transverse half-wave voltage, outputting continuous vertical polarized laser;
the signal control master switch controls the first optical switch to be firstly opened and then to be simultaneously closed with the second optical switch, 2 mu m horizontal linear polarized light transmitted by the 2 mu m semi-transmission half mirror is converted into vertical linear polarized light by the half-wave plate, the vertical linear polarized light is reflected to the second optical switch by the first total reflection mirror, when the second optical switch is closed, the 2 mu m vertical linear polarized light sequentially passes through the second total reflection mirror, the optical delay device, the third total reflection mirror, the optical attenuator and the Brewster mirror, the Brewster mirror reflects the 2 mu m vertical linear polarized light to Ho; when the transverse electro-optic modulation crystal applies transverse half-wave voltage, pulse laser in a horizontal polarization state is output through the 2 mu m semi-transmission half-reflecting mirror.
The method for switching and outputting continuous light and pulse light by adopting a third device is adopted, a signal control master switch controls a first optical switch to be closed, a second optical switch to be opened, horizontal linear polarized light generated by a 1.9 mu m horizontal linear polarization continuous light laser enters a resonant cavity input cavity mirror through the first optical switch, 1.9 mu m horizontal linear polarized light provides pumping energy for a Ho:LLF laser crystal through a Brewster mirror, and the pumping power of a pumping source is controlled to enable the 1.9 mu m horizontal linear polarized light to generate 2 mu m horizontal linear polarized light through the Ho:LLF laser crystal; when the 2 mu m horizontal polarized light is reflected to the resonant cavity output coupling mirror through the 2 mu m semi-transmission half reflecting mirror, outputting 2 mu m continuous horizontal polarized laser; when 2 mu m horizontal polarized light is transmitted to the first lithium niobate crystal through the 2 mu m semi-transmission half mirror, and transverse half-wave voltage is applied to the first lithium niobate crystal, 2 mu m continuous horizontal polarized light is changed into 2 mu m continuous vertical polarized light, and the 2 mu m continuous vertical polarized light is output from the second 2 mu m semi-transmission half mirror;
the signal control master switch controls the first optical switch to be firstly opened and then to be simultaneously closed with the second optical switch, 2 mu m horizontal linearly polarized light transmitted by the 2 mu m semi-transmission half mirror is reflected to the second lithium niobate crystal through the first lithium niobate crystal and the second 2 mu m semi-transmission half mirror which are not subjected to voltage, transverse half-wave voltage is applied to the second lithium niobate crystal, the 2 mu m horizontal linearly polarized light is changed into 2 mu m vertical linearly polarized light, the 2 mu m vertical linearly polarized light sequentially passes through the closed second optical switch, the second total mirror, the optical delay device, the third total mirror, the optical attenuator and the Brewster mirror, the Brewster mirror reflects the 2 mu m vertical linearly polarized light to the Ho LLF laser crystal, and when the 2 mu m vertical linearly polarized light is reflected to the resonant cavity output coupling mirror through the 2 mu m semi-transmission half mirror, then 2 mu m pulse vertical polarized laser is output; when 2 μm vertical polarized light is transmitted to the first lithium niobate crystal by the 2 μm half-transmitting half mirror, and a transverse half-wave voltage is applied to the first lithium niobate crystal, 2 μm pulse vertical polarized light is changed into 2 μm pulse horizontal polarized light, which is output from the second 2 μm half-transmitting half mirror.
The invention has the beneficial effects that: based on self injection, the single laser can realize the switching of linear polarized continuous laser and pulse laser, namely one laser can realize the functions of the continuous laser and the pulse laser, and the cost of laser devices is reduced. The accurate signal control master switch can realize accurate real-time switching of continuous laser and pulse laser, and can be automatically adjusted according to requirements. The continuous light output by the invention is in a horizontal polarization state or the pulse is in a vertical polarization state, so that the laser orthogonal double polarization state output is realized. The self-injection laser not only can realize real-time switching of continuous light and pulse light by a single laser device, but also can respectively output two beams of laser beams with mutually perpendicular polarization, and can be switched between continuous horizontal light and pulse vertical light at any time according to requirements.
Drawings
FIG. 1 is a light path diagram of a device according to embodiment 1 of the present invention;
FIG. 2 is a circuit control system according to embodiment 1 of the present invention;
FIG. 3 is a circuit control flow chart of embodiment 1 of the present invention;
fig. 4 is a light path diagram of the device in embodiment 3 of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Example 1:
referring to fig. 1 and 2,1 is a 1.9 μm horizontally linear polarized continuous light laser; 2 is a first optical switch; 3 is a resonant cavity input cavity mirror (1.9 mu m wave band antireflection, 2 mu m wave band total reflection); 4 is Brewster's mirror; and 5 is Ho, LLF laser crystal; 6 is a 2 mu m semi-transmission half reflecting mirror; 7 is a first total reflection mirror; 8 is a second optical switch; 9 is a second total reflection mirror; 10 is an optical delay; 11 is a third total reflection mirror; 12 is an optical attenuator; 13 is a resonant cavity output coupling mirror; 14 is a half wave plate; 15 is a signal control master switch.
The invention provides a device and a method for realizing continuous light and pulse light switching based on self-injection. The self-injection optical loop mainly comprises three total reflectors and Brewster mirrors, and continuous laser and pulse light switching is realized by simultaneously controlling two optical switches and adjusting an intracavity optical delay device and an optical attenuator. The laser components are a 1.9 mu m horizontal linear polarization continuous light laser 1, a first optical switch 2, a resonant cavity input cavity mirror 3, a Brewster mirror 4 and Ho: LLF (Ho) 3+ :LiLuF 4 ) The laser crystal 5, the 2 mu m semi-transmission half mirror 6, the half wave plate 14, the first total reflection mirror 7, the second optical switch 8, the second total reflection mirror 9, the optical delay device 10, the third total reflection mirror 11, the optical attenuator 12 and the resonant cavity output coupling mirror 13. Folding the laser cavity: the folding laser cavity sequentially comprises a 1.9 mu m horizontal linear polarization continuous light laser 1, a first optical switch 2, a resonant cavity input cavity mirror 3, a Brewster mirror 4 and a Ho: LLAn F laser crystal 5, a 2 mu m semi-transmission half mirror 6 and a resonant cavity output coupling mirror 13. Self-injection cavity: the self-injection cavity sequentially comprises a 2 mu m semi-transmission half reflecting mirror 6, a half wave plate 14, a first total reflecting mirror 7, a second optical switch 8, a second total reflecting mirror 9, an optical delayer 10, a third total reflecting mirror 11, an optical attenuator 12, a Brewster mirror 4 and Ho, wherein the LLF laser crystal 5;
the method comprises the following steps:
1) Folding laser cavity device: the horizontally linearly polarized light generated by the 1.9 mu m horizontally linearly polarized continuous laser 1 enters the resonant cavity input cavity mirror 3 through the first optical switch 2, wherein the resonant cavity input cavity mirror 3 is plated with a 1.9 mu m antireflection film, and the 1.9 mu m horizontally polarized light provides pumping energy for the Ho: LLF laser crystal 5 through the Brewster mirror 4. By controlling the pumping power of the pumping source, 1.9 μm of linearly polarized light is passed through Ho: LLF laser crystal 5 generates 2 μm of linearly polarized light. The 2 mu m linearly polarized light is reflected to the resonant cavity output coupling mirror 13 through the 2 mu m semi-transmission half reflecting mirror 6, and continuous horizontally polarized laser (resonant cavity single-pass light path 3-4-5-6-13) is output;
2) Self-injection lumen device: after laser is stably output, 2 mu m horizontal linearly polarized light transmitted by a 2 mu m semi-transmitting half reflecting mirror 6 is converted into vertical linearly polarized light through a half wave plate 14, the vertical linearly polarized light is reflected to a second photoelectric switch 8 by a first total reflecting mirror 7, when the switch 8 is closed, the 2 mu m vertical linearly polarized light sequentially passes through a second total reflecting mirror 9, a light delay 10, a third total reflecting mirror 11, a light attenuator 12 and a Brewster mirror 4, wherein the Brewster mirror 4 can reflect the 2 mu m vertical linearly polarized light to Ho, and the LLF laser crystal 5 completes a self-injection light loop (self-injection light loop 6-14-7-8-9-10-11-12-4-5-6);
3) Pulse laser and continuous laser output circuit control:
referring to fig. 3, the signal control master switch 15 controls the first optical switch 2, the second optical switch 8, the optical delay 10 and the optical attenuator 12 respectively, and the signal control master switch 15 controls the first optical switch 2 and the second optical switch 8 respectively to realize continuous laser output. The signal control master switch respectively controls the first optical switch 2, the second optical switch 8, the optical delay 10 and the optical attenuator 12 to realize pulse laser output. The real-time switching of the pulse laser and the continuous laser can be realized by precisely controlling the signal control master switch 15. The signal control master switch 15 adopts a highly integrated control circuit, can automatically switch laser pulse output or continuous output according to requirements, and can ensure delay and synchronous operation of each device.
When the first optical switch 2 is closed and the second optical switch 8 is opened, the 2 mu m horizontal continuous polarized light oscillates in the folding cavity, so that the horizontal polarized continuous laser output is realized.
First, the first optical switch 2 is opened first and is closed rapidly and simultaneously with the second optical switch 8, at this time, the horizontal polarized light is changed into vertical polarized light through the half-wave plate 14, and the vertical polarized laser self-injection can be realized through the fine-tuned optical attenuator 10 and the optical delay device 12, so as to generate the pulse laser output in the vertical polarization state.
Example 2:
with reference to fig. 1, a transverse electro-optic modulation crystal is placed behind the resonant cavity output coupling mirror 13, so that 2 μm continuous orthogonal polarization state output or pulse orthogonal polarization state output can be realized. When the transverse electro-optic modulation crystal does not apply transverse half-wave voltage, the output laser is continuous horizontal polarized light, namely P polarized light or pulse vertical polarized light, namely S polarized light; when the transverse electro-optic modulation crystal applies transverse half-wave voltage, the output laser continuously vertically polarizes light, namely S polarized light, or pulse horizontally polarizes light, namely P polarized light. By applying a half-wave voltage on the transverse electro-optic modulation crystal, S/P polarization state asynchronous output in continuous/pulse can be realized.
The specific method comprises the following steps: the signal control master switch 15 controls the first optical switch 2 to be closed, the second optical switch 8 to be opened, the horizontal linear polarized light generated by the 1.9 mu m horizontal linear polarization continuous optical laser 1 enters the resonant cavity input cavity mirror 3,1.9 mu m through the first optical switch 2 and is provided with pumping energy by the LLF laser crystal 5 through the Brewster mirror 4, the pumping power of a pumping source is controlled to enable the 1.9 mu m horizontal linear polarized light to generate 2 mu m horizontal linear polarized light by the Ho, the 2 mu m horizontal linear polarized light is reflected to the resonant cavity output coupling mirror 13 through the 2 mu m semi-transparent half-reflecting mirror 6, and when the transverse electro-optic modulation crystal does not apply transverse half-wave voltage, continuous horizontal polarized laser is output; when a transverse electro-optic modulation crystal applies a transverse half-wave voltage, outputting continuous vertical polarized laser;
the signal control master switch controls the first optical switch 2 to be firstly opened and then to be simultaneously closed with the second optical switch 8, 2 mu m horizontal linear polarized light transmitted by the 2 mu m semi-transmission half mirror 6 is converted into vertical linear polarized light by the half wave plate 14, the vertical linear polarized light is reflected to the second optical switch 8 by the first total mirror 7, when the second optical switch 8 is closed, the 2 mu m vertical linear polarized light sequentially passes through the second total mirror 9, the optical delay 10, the third total mirror 11, the optical attenuator 12 and the Brewster mirror 4, the Brewster mirror 4 reflects the 2 mu m vertical linear polarized light to the Ho LLF laser crystal 5, and when the transverse electro-optic modulation crystal does not apply transverse half wave voltage, pulse laser in a vertical polarization state is output by the 2 mu m semi-transmission half mirror 6; when a transverse half-wave voltage is applied to the transverse electro-optic modulation crystal, pulse laser in a horizontal polarization state is output through the 2 mu m semi-transmission half-reflecting mirror 6.
Example 3:
in connection with fig. 4, the side pumping mode is used for the 1.9 μm horizontally polarized continuous light laser 1 in fig. 1, and the same applies to end pumping. If the first total reflection mirror 7 is replaced with a second 2 μm half-transmission half-reflection mirror 17, the half-wave plate 14 is removed and two lithium niobate crystals having lateral half-wave voltage control are replaced with a first lithium niobate crystal 16 and a second lithium niobate crystal 18, respectively, on both sides of the second 2 μm half-transmission half-reflection mirror 17, as shown in fig. 4.
The signal control master switch 15 controls the first optical switch 2 to be closed, the second optical switch 8 to be opened, the horizontally linearly polarized light generated by the 1.9 mu m horizontally linearly polarized continuous optical laser 1 enters the resonant cavity input cavity mirror 3,1.9 mu m horizontally linearly polarized light through the first optical switch 2, pump energy is provided for the Ho: LLF laser crystal 5 through the Brewster mirror 4, and the pump power of the pump source is controlled to enable the 1.9 mu m horizontally linearly polarized light to generate 2 mu m horizontally linearly polarized light through the Ho: LLF laser crystal 5. When the 2 mu m horizontal polarized light is reflected to the resonant cavity output coupling mirror 13 through the 2 mu m semi-transmission half reflecting mirror 6, 2 mu m continuous horizontal polarized laser is output; when 2 μm horizontal polarized light is transmitted to the first lithium niobate crystal 16 through the 2 μm half-transmitting half mirror 6, and a transverse half-wave voltage is applied to the first lithium niobate crystal 16, 2 μm continuous horizontal polarized light is changed into 2 μm continuous vertical polarized light (i.e., p polarized light) and is output from the second 2 μm half-transmitting half mirror 17, so that continuous orthogonal polarized output of dual port output can be realized.
The signal control master switch 15 controls the first optical switch 2 to be opened firstly and then closed simultaneously with the second optical switch 8, the horizontally linear polarized light generated by the 1.9 mu m horizontally linear polarized continuous optical laser 1 enters the resonant cavity input cavity mirror 3,1.9 mu m horizontally linear polarized light through the first optical switch 2 and provides pumping energy for the Ho: LLF laser crystal 5 through the Brewster mirror 4, and the 1.9 mu m horizontally linear polarized light is caused to generate 2 mu m horizontally linear polarized light through the Ho: LLF laser crystal 5 through controlling the pumping power of the pumping source. The 2 μm horizontally polarized light transmitted through the 2 μm half mirror 6 is reflected to the second lithium niobate crystal 18 by the first lithium niobate crystal 16 and the second 2 μm half mirror 17, which are not energized, and the 2 μm horizontally polarized light (i.e., P polarized light) is changed into 2 μm vertically polarized light (S polarized light) by applying a transverse half-wave voltage to the second lithium niobate crystal 18. The 2 mu m vertical linearly polarized light sequentially passes through a closed second optical switch 8, a second total reflecting mirror 9, an optical delay device 10, a third total reflecting mirror 11, an optical attenuator 12 and a Brewster mirror 4, and the Brewster mirror 4 reflects the 2 mu m vertical linearly polarized light to the Ho: LLF laser crystal 5. When the 2 mu m vertical linearly polarized light is reflected to the resonant cavity output coupling mirror 13 through the 2 mu m semi-transmission half mirror 6, 2 mu m pulse vertical polarized laser is output; when 2 μm vertical polarized light is transmitted to the first lithium niobate crystal 16 through the 2 μm half-transmitting half mirror 6, and a transverse half-wave voltage is applied to the first lithium niobate crystal 16, 2 μm pulse vertical polarized light is changed into 2 μm pulse horizontal polarized light (i.e., S polarized light) and output from the second 2 μm half-transmitting half mirror 17, so that pulse orthogonal polarized output of dual port output can be realized.

Claims (4)

1. A device for switching between continuous light and pulsed light, comprising: the device comprises a 1.9 mu m horizontal linear polarization continuous light laser (1), a first optical switch (2), a resonant cavity input cavity mirror (3), a Brewster mirror (4), a Ho: LLF laser crystal (5), a 2 mu m semi-transmission half mirror (6), a first total mirror (7), a second optical switch (8), a second total mirror (9), an optical delayer (10), a third total mirror (11), an optical attenuator (12), a resonant cavity output coupling mirror (13), a half-wave plate (14) and a signal control total switch (15); the signal control master switch (15) controls the first optical switch (2), the second optical switch (8), the optical delayer (10) and the optical attenuator (12);
when the signal control master switch (15) controls the first optical switch (2) to be closed and the second optical switch (8) to be opened, horizontal linear polarized light generated by the 1.9 mu m horizontal linear polarization continuous light laser (1) enters the resonant cavity input cavity mirror (3) through the first optical switch (2), the 1.9 mu m horizontal linear polarized light provides pumping energy for the Ho: LLF laser crystal (5) through the Brewster mirror (4), the 1.9 mu m horizontal linear polarized light is enabled to generate 2 mu m horizontal linear polarized light through the Ho: LLF laser crystal (5) through controlling the pumping power of the pumping source, the 2 mu m horizontal linear polarized light is reflected to the resonant cavity output coupling mirror (13) through the 2 mu m semi-transparent half mirror (6), and then continuous horizontal polarized laser is output;
when the signal control master switch controls the first optical switch (2) to be opened firstly and then to be closed simultaneously with the second optical switch (8), 2 mu m horizontal polarized light transmitted by the 2 mu m semi-transmission half mirror (6) is converted into vertical linear polarized light through the half-wave plate (14), the vertical linear polarized light is reflected to the second optical switch (8) through the first full-reflection mirror (7), when the second optical switch (8) is closed, the 2 mu m vertical linear polarized light sequentially passes through the second full-reflection mirror (9), the optical delay device (10), the third full-reflection mirror (11), the optical attenuator (12) and the Brewster mirror (4), and the Brewster mirror (4) reflects the 2 mu m vertical linear polarized light to the Ho LLF laser crystal (5) and outputs pulse laser in a vertical polarization state through the 2 mu m semi-transmission half mirror (6).
2. The apparatus for switching output of continuous light and pulsed light according to claim 1, wherein: placing a transverse electro-optic modulation crystal behind the resonant cavity output coupling mirror, and outputting laser which is continuous horizontal polarized light or pulse vertical polarized light when transverse half-wave voltage is not applied to the transverse electro-optic modulation crystal; when the transverse electro-optic modulation crystal applies transverse half-wave voltage, the output laser continuously vertically polarizes light or pulse horizontally polarizes light.
3. A method of switching output of continuous light and pulsed light using the apparatus of claim 1, wherein: the signal control master switch (15) controls the first optical switch (2) to be closed, the second optical switch (8) to be opened, horizontal linear polarized light generated by the 1.9 mu m horizontal linear polarization continuous optical laser (1) enters the resonant cavity input cavity mirror (3) through the first optical switch (2), the 1.9 mu m horizontal linear polarized light provides pumping energy for the Ho for the LLF laser crystal (5) through the Brewster mirror (4), the 1.9 mu m horizontal linear polarized light passes through the Ho by controlling the pumping power of the pumping source, the LLF laser crystal (5) generates 2 mu m horizontal linear polarized light, the 2 mu m horizontal linear polarized light is reflected to the resonant cavity output coupling mirror (13) through the 2 mu m semi-transmission half mirror (6), and then continuous horizontal polarized laser is output;
the signal control master switch controls the first optical switch (2) to be opened firstly and then to be closed simultaneously with the second optical switch (8), 2 mu m horizontal polarized light transmitted by the 2 mu m semi-transmission half mirror (6) is converted into vertical linear polarized light through the half-wave plate (14), the vertical linear polarized light is reflected to the second optical switch (8) through the first total mirror (7), when the second optical switch (8) is closed, the 2 mu m vertical linear polarized light sequentially passes through the second total mirror (9), the optical delay device (10), the third total mirror (11), the optical attenuator (12) and the Brewster mirror (4), and the Brewster mirror (4) reflects the 2 mu m vertical linear polarized light to the Ho: LLF laser crystal (5) and outputs pulse laser in a vertical polarization state through the 2 mu m semi-transmission half mirror (6).
4. A method of switching output of continuous light and pulsed light using the apparatus of claim 2, characterized by: the signal control master switch (15) controls the first optical switch (2) to be closed, the second optical switch (8) to be opened, horizontal linear polarized light generated by the 1.9 mu m horizontal linear polarization continuous optical laser (1) enters the resonant cavity input cavity mirror (3) through the first optical switch (2), the 1.9 mu m horizontal linear polarized light provides pumping energy for the Ho for the LLF laser crystal (5) through the Brewster mirror (4), the 1.9 mu m horizontal linear polarized light passes through the Ho by controlling the pumping power of the pumping source, the LLF laser crystal (5) generates 2 mu m horizontal linear polarized light, the 2 mu m horizontal linear polarized light is reflected to the resonant cavity output coupling mirror (13) through the 2 mu m semi-transmission half mirror (6), and when the transverse electro-optical modulation crystal does not apply transverse half-wave voltage, continuous horizontal polarized laser is output; when a transverse electro-optic modulation crystal applies a transverse half-wave voltage, outputting continuous vertical polarized laser;
the signal control master switch controls the first optical switch (2) to be firstly opened and then to be simultaneously closed with the second optical switch (8), 2 mu m horizontal linear polarized light transmitted by the 2 mu m semi-transmission half mirror (6) is converted into vertical linear polarized light through the half-wave plate (14), the vertical linear polarized light is reflected to the second optical switch (8) through the first full-reflection mirror (7), when the second optical switch (8) is closed, the 2 mu m vertical linear polarized light sequentially passes through the second full-reflection mirror (9), the optical delay device (10), the third full-reflection mirror (11), the optical attenuator (12) and the Brewster mirror (4), the Brewster mirror (4) reflects the 2 mu m vertical linear polarized light to the Ho: LLF laser crystal (5), and when the transverse half-wave voltage is not applied to the transverse electro-optical modulation crystal, pulse laser in a vertical polarization state is output through the 2 mu m semi-transmission half mirror (6); when a transverse half-wave voltage is applied to the transverse electro-optic modulation crystal, pulse laser in a horizontal polarization state is output through a 2 mu m semi-transmission half-reflecting mirror (6).
CN202210066093.2A 2022-01-20 2022-01-20 Device and method for switching output continuous light and pulse light Active CN114520458B (en)

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