CN101819147A - Dynamic measurement method and device of effective service life of laser upper energy level - Google Patents
Dynamic measurement method and device of effective service life of laser upper energy level Download PDFInfo
- Publication number
- CN101819147A CN101819147A CN 201010142174 CN201010142174A CN101819147A CN 101819147 A CN101819147 A CN 101819147A CN 201010142174 CN201010142174 CN 201010142174 CN 201010142174 A CN201010142174 A CN 201010142174A CN 101819147 A CN101819147 A CN 101819147A
- Authority
- CN
- China
- Prior art keywords
- laser
- energy level
- service life
- effective service
- upper energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Lasers (AREA)
Abstract
The invention provides dynamic measurement method and device of effective service life of laser upper energy level. The measurement device comprises a laser diode, a coupling lens, a resonant cavity, a laser crystal, an acoustooptical Q switch, a fast response detector and a digital oscilloscope. The measurement method comprises the steps of: (1) regulating a Q regulating laser device of pumping at end surface of the laser diode so as to ensure that the laser diode has stable pulse output; (2) measuring the changing relationship of a pulse peak power with a recurrence frequency; (3) obtaining a recurrence frequency corresponding to a state that the pulse peak power begins to descend obviously and obtaining reciprocal of the recurrence frequency, which is the effective service life of the laser upper energy level. The measurement device of the invention has simple structure and easy operation. The dynamic measurement method of the effective service life of the laser upper energy level of the invention has accurate data measurement and convenient processing.
Description
Technical field
What the present invention relates to is a kind of dynamic measurement method and measurement mechanism of effective service life of laser upper energy level.
Background technology
Q-switch solid laser has important use in fields such as laser ranging, laser remote sensing, scientific research and medical treatment.The laser instrument of ns level pulse width generally adopts Q-regulating technique, and Q-regulating technique is meant and adopts certain method that the dissipation factor rule in accordance with regulations in the chamber is changed.When pumping just begins, make laser cavity have high dissipation factor earlier, lasing threshold value is improved, can not produce laser generation because threshold value is high, so the population on the metastable state just can run up to higher level, in the suitable moment cavity loss is reduced suddenly then, threshold value also decreases, this moment, inverted population substantially exceeded threshold value, stimulated radiation promptly strengthens, in the extremely short time, the energy of the particle that last energy level stores can change laser energy into, forms a very strong laser giant-pulse output.When acousto-optic Q-switching is used for continuous light-pumped solid state laser, be the rect.p. of f when modulating the signal of high frequency oscillator when produce frequency with pulse-modulator, laser instrument is just exported the laser pulse sequence that repetition frequency is f.In order to make the abundant particle of energy level accumulation on the laser crystal, and avoid too much spontaneous radiation loss, obtain maximum inverted population utilization factor so that guarantee laser instrument, the time interval of adjacent two pulses (1/f) roughly will equate with the last energy level useful life of working-laser material, the peak power that export pulse this moment will reach maximal value, therefore under the power of a certain fixed pump Pu, can obtain the useful life of upper laser level by the maximal value that records peak value of pulse.
In Q-switched laser, the energy storage capacity of gain media is the important indicator that influences its output, and the last energy level useful life of gain media is to embody the important parameter of its energy storage capacity.Therefore, the energy storage ability of assessing laser crystal by the useful life of actual kinetic measurement upper laser level has great significance.
Summary of the invention
The object of the present invention is to provide a kind of dynamic measurement method of effective service life of laser upper energy level of simple possible.The present invention also aims to provide a kind of dynamic measurement device of effective service life of laser upper energy level.
The object of the present invention is achieved like this:
The dynamic measurement method of effective service life of laser upper energy level of the present invention comprises following step: (1) adjusts the Q-switched laser of laser diode end-face pump, makes it that stable pulse output be arranged; (2) measure the variation relation of pulse peak power with repetition frequency; Pairing repetition frequency when (3) obtaining pulse peak power and begin obviously to descend, the inverse of getting this repetition frequency is the useful life of upper laser level.
The dynamic measurement method of effective service life of laser upper energy level of the present invention is to realize by such measurement mechanism: measurement mechanism comprises laser diode, coupled lens, resonator cavity, laser crystal, acousto-optic Q-switching, quick response detector and digital oscilloscope; The pump light that is sent by laser diode enters in the resonator cavity after the coupled lens shaping, the flat-concave cavity that described resonator cavity is made up of Effect of Back-Cavity Mirror and outgoing mirror, the pumping end surface of laser crystal is coated with high saturating, anti-to the oscillating laser height film system of pump light, the Effect of Back-Cavity Mirror of serving as laser instrument, the plano-concave mirror of rear end is an outgoing mirror; The laser crystal side is wrapped with indium foil and is sandwiched in the light hole that has the metal copper billet, and copper billet sticks at the huyashi-chuuka (cold chinese-style noodles) of thermoelectric module with heat conductive silica gel, and the hot side of thermoelectric module and heat radiator close proximity are touched, and is used for dissipating the heat that refrigeration produces; Between laser crystal and outgoing mirror, place acousto-optic Q-switching, reach the purpose of transferring Q.
At first adjust Q-switched laser, make it that stable output pulse sequence be arranged under a certain pump power; Observe under certain pump power pulse peak power with the variation relation of repetition frequency with detector in conjunction with digital oscilloscope then, find in the process that repetition frequency is increasing, pulse peak power is constant substantially within the specific limits, but the pulse peak power reaches maximal value when repetition frequency is increased to a certain numerical value, further increase pulse repetition rate, then pulse peak power begins to occur tangible decline; Get pulse peak power begin to occur obviously the to descend inverse of time institute's respective pulses repetition frequency value and be the useful life of upper laser level.The invention is characterized in that experimental provision is simple,, need not change the structure of laser resonant cavity in case the Q-switched laser debugging is finished.
The method of energy level useful life on the described Laser Measurement is being the Q-switch solid laser of laser diode end-face pump to the measuring object in the measurement of the relation of output pulse peak power and repetition frequency wherein.
The method of energy level useful life on the described Laser Measurement is characterized in that used laser instrument comprises laser diode end-face pump source, coupled lens, resonator cavity, laser crystal and acousto-optic Q-switching.
The method of energy level useful life on the described Laser Measurement, the measurement of wherein said relation to output pulse peak power and repetition frequency does not need to make any change after in a single day Q-switched laser is adjusted.
Described pumping source is the optical fiber coupling laser diode end-face pump source of output continuously, focuses in the laser crystal after the pump light process coupled lens group shaping of its output.
Described gain media can be Nd
3+, Tm
3+, Ho
3+, Yb
3+, Er
3+Deng the laser crystal that mixes, its size and doping content are decided on the kind of laser crystal.
Described laser crystal, two end face is through strict polishing, one of them end face is coated with the anti-reflection film of corresponding output laser, and another end face is coated with at the anti-reflection film of pump light and the film that is all-trans of output laser, and this end face also serves as the Effect of Back-Cavity Mirror of resonator cavity.
Described laser crystal, described laser crystal be placed on copper heat sink on, and by thermoelectric refrigerating unit temperature control initiatively.
Described resonator cavity, the Effect of Back-Cavity Mirror of described resonator cavity are an end face of laser crystal, and this end face is coated with the anti-reflection film of the be all-trans film and the pumping wavelength of output laser.
Described resonator cavity, the outgoing mirror of described laser instrument are the plano-concave mirror, and its transmitance at output wavelength is 1～30%, and concrete value is decided on different situations.
Described acousto-optic Q-switching, two end faces of described adjusting Q crystal are coated with the anti-reflection film at output laser.
Measurement mechanism of the present invention is simple in structure, easy to operate.The dynamic measurement method DATA REASONING of effective service life of laser upper energy level of the present invention is accurate, and it is convenient to handle.
Description of drawings
Fig. 1 represents measurement mechanism synoptic diagram of the present invention;
Fig. 2 represents to use output pulse peak power that measurement mechanism shown in Figure 1 the records variation relation with pulse repetition rate, and wherein pump power is 1.38W;
Fig. 3 represents to use measurement mechanism shown in Figure 1 to record the variation relation of the useful life of upper laser level with pump power.
Embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
The measurement mechanism of present embodiment as shown in Figure 1, comprise that output wavelength is optical fiber coupling output laser diode end-face pump source 1, coupled lens 2, the Tm of 792nm, Ho:YLF laser crystal (its pumping end surface is served as the Effect of Back-Cavity Mirror of resonator cavity) 3, acousto-optic Q-switching 4, outgoing mirror 5, quick response detector 6, digital oscilloscope 7.Pump light by the 792nm of laser diode end-face pump source 1 output enters Tm after coupled lens 2 shapings, in the Ho:YLF laser crystal 3; Tm, Ho:YLF laser crystal sandwich and have in light hole copper heat sink, and by the temperature of the strict control of temperature control system crystal with take away the heat that crystal produces in the pumping process, in the present embodiment, Tm, the temperature of Ho:YLF laser crystal 3 is controlled in 10 ℃; At Tm, place acousto-optic Q-switching 4 between Ho:YLF laser crystal 3 and the outgoing mirror 5; Adjust laser instrument, make it produce 2.06 μ m laser generations by outgoing mirror 5 outputs, and by response detector 6 detections fast; The shape of output pulse and peak value are shown by digital oscilloscope 7.Fig. 2 has provided when pump power is 1.38W, and pulse peak power is with the variation relation of repetition frequency.As seen from Figure 2, when repetition frequency was 400Hz, pulse peak power began to occur comparatively significantly to descend, so the useful life that laser instrument is gone up energy level at this moment should get the inverse of this repetition frequency, was 2.5ms.Fig. 3 has provided the variation relation of effective service life of laser upper energy level with pump power.As seen from Figure 3, Tm, the useful life of energy level reduces with the increase of pump power on the Ho:YLF laser instrument.
The output wavelength of the fibre coupled laser diode of described continuous output is 792nm, focuses on Tm after the pump light process coupled lens group shaping of the 792nm of its output, in the Ho:YLF laser crystal.
Each end face of described coupled lens group is coated with the anti-reflection film of 792nm.
Described Tm, the cut direction of Ho:YLF crystal is a direction of principal axis along the physics definition, and crystal is long to be 2.5mm, and doping content is 6%Tm
3+, 0.4%Ho
3+
Described Tm, Ho:YLF crystal pumping end surface is coated with the anti-reflection film of the be all-trans film and the 792nm pump light of 2.06 μ m laser, and the other end is coated with 2.06 μ m anti-reflection films.
Described laser instrument is pulse output, and its output wavelength is 2.06 μ m.
Described laser crystal Tm, Ho:YLF be placed on copper heat sink on, and by thermoelectric refrigerating unit temperature control initiatively.
The outgoing mirror of described laser instrument is the plano-concave mirror, and its midplane is coated with the anti-reflection film of 2.06 μ m, and it is 2% film system that concave surface is coated with wavelength 2.06 μ m laser transmittances.
Described acousto-optic Q-switching is characterized in that two end faces of described adjusting Q crystal are coated with the anti-reflection film at wavelength 2.06 μ m laser.
Claims (4)
1. the dynamic measurement method of an effective service life of laser upper energy level, it is characterized in that comprising following step: (1) adjusts the Q-switched laser of laser diode end-face pump, makes it that stable pulse output be arranged; (2) measure the variation relation of pulse peak power with repetition frequency; Pairing repetition frequency when (3) obtaining pulse peak power and begin obviously to descend, the inverse of getting this repetition frequency is the useful life of upper laser level.
2. the dynamic measurement device of an effective service life of laser upper energy level comprises laser diode, coupled lens, resonator cavity, laser crystal, acousto-optic Q-switching, quick response detector and digital oscilloscope; It is characterized in that: the pump light that is sent by laser diode enters in the resonator cavity after the coupled lens shaping, the flat-concave cavity that described resonator cavity is made up of Effect of Back-Cavity Mirror and outgoing mirror, the pumping end surface of laser crystal is coated with high saturating, anti-to the oscillating laser height film system of pump light, the Effect of Back-Cavity Mirror of serving as laser instrument, the plano-concave mirror of rear end is an outgoing mirror; The laser crystal side is wrapped with indium foil and is sandwiched in the light hole that has the metal copper billet, and copper billet sticks at the huyashi-chuuka (cold chinese-style noodles) of thermoelectric module with heat conductive silica gel, and the hot side of thermoelectric module and heat radiator close proximity are touched, and is used for dissipating the heat that refrigeration produces; Between laser crystal and outgoing mirror, place acousto-optic Q-switching.
3. the dynamic measurement device of effective service life of laser upper energy level according to claim 2, it is characterized in that: described laser crystal is to contain Nd
3+, Tm
3+, Ho
3+, Yb
3+, Er
3+The laser crystal that gain media mixes.
4. according to the dynamic measurement device of claim 2 or 3 described effective service life of laser upper energy level, it is characterized in that: the outgoing mirror of described laser instrument is the plano-concave mirror, and its transmitance at output wavelength is 1～30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010142174 CN101819147A (en) | 2010-04-09 | 2010-04-09 | Dynamic measurement method and device of effective service life of laser upper energy level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010142174 CN101819147A (en) | 2010-04-09 | 2010-04-09 | Dynamic measurement method and device of effective service life of laser upper energy level |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101819147A true CN101819147A (en) | 2010-09-01 |
Family
ID=42654323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010142174 Pending CN101819147A (en) | 2010-04-09 | 2010-04-09 | Dynamic measurement method and device of effective service life of laser upper energy level |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101819147A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054626A (en) * | 2017-12-13 | 2018-05-18 | 西安理工大学 | To the method for pump light finely regulating in a kind of end-face pump solid laser |
| CN110095258A (en) * | 2019-05-26 | 2019-08-06 | 天津大学 | Rare earth ion life time of the level measuring device and measuring method in a kind of Active Optical Fiber |
| CN111505474A (en) * | 2020-04-24 | 2020-08-07 | 中国科学院长春光学精密机械与物理研究所 | CO2Laser amplifier upper energy level service life testing device and method |
| CN112683846A (en) * | 2021-01-05 | 2021-04-20 | 中国科学技术大学 | Trace gas detection device and method |
| US11881676B2 (en) * | 2019-01-31 | 2024-01-23 | L3Harris Technologies, Inc. | End-pumped Q-switched laser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063159A (en) * | 1992-01-23 | 1992-07-29 | 中国科学院上海技术物理研究所 | Measure the new method of semiconductor nonequilibrium carrier lifetime |
| US5315122A (en) * | 1992-08-25 | 1994-05-24 | Becton, Dickinson And Company | Apparatus and method for fluorescent lifetime measurement |
| CN101162694A (en) * | 2007-11-16 | 2008-04-16 | 中国科学院电工研究所 | Chemical passivation method for measuring minority carrier lifetime of crystalline silicon |
| RU2330299C1 (en) * | 2007-02-26 | 2008-07-27 | Государственное образовательное учреждение высшего профессионального образования "Саратовский государственный университет имени Н.Г. Чернышевского" | Method of determination of electron lifetime in active range of the solid-state injection laser diode |
-
2010
- 2010-04-09 CN CN 201010142174 patent/CN101819147A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063159A (en) * | 1992-01-23 | 1992-07-29 | 中国科学院上海技术物理研究所 | Measure the new method of semiconductor nonequilibrium carrier lifetime |
| US5315122A (en) * | 1992-08-25 | 1994-05-24 | Becton, Dickinson And Company | Apparatus and method for fluorescent lifetime measurement |
| RU2330299C1 (en) * | 2007-02-26 | 2008-07-27 | Государственное образовательное учреждение высшего профессионального образования "Саратовский государственный университет имени Н.Г. Чернышевского" | Method of determination of electron lifetime in active range of the solid-state injection laser diode |
| CN101162694A (en) * | 2007-11-16 | 2008-04-16 | 中国科学院电工研究所 | Chemical passivation method for measuring minority carrier lifetime of crystalline silicon |
Non-Patent Citations (2)
| Title |
|---|
| 《新疆大学学报(自然科学版)》 20090228 王敏等 Rb蒸气中的辐射陷获效应和5P1/2能级有效寿命的测量 参见期刊第74-77页 1-4 第26卷, 第1期 2 * |
| 《物理学报》 20060331 张新陆等 能量传递上转换对Tm,Ho:YLF调Q激光器上能级寿命的影响 参见期刊第1162页右栏倒数第1段至第1163右栏倒数页第2段、图5-6 1-4 第55卷, 第3期 2 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054626A (en) * | 2017-12-13 | 2018-05-18 | 西安理工大学 | To the method for pump light finely regulating in a kind of end-face pump solid laser |
| US11881676B2 (en) * | 2019-01-31 | 2024-01-23 | L3Harris Technologies, Inc. | End-pumped Q-switched laser |
| CN110095258A (en) * | 2019-05-26 | 2019-08-06 | 天津大学 | Rare earth ion life time of the level measuring device and measuring method in a kind of Active Optical Fiber |
| CN110095258B (en) * | 2019-05-26 | 2021-04-27 | 天津大学 | Device and method for measuring energy level life of rare earth ions in active optical fiber |
| CN111505474A (en) * | 2020-04-24 | 2020-08-07 | 中国科学院长春光学精密机械与物理研究所 | CO2Laser amplifier upper energy level service life testing device and method |
| WO2021212710A1 (en) * | 2020-04-24 | 2021-10-28 | 中国科学院长春光学精密机械与物理研究所 | Device and method for measuring upper energy level lifetime of co2 laser amplifier |
| CN112683846A (en) * | 2021-01-05 | 2021-04-20 | 中国科学技术大学 | Trace gas detection device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101819147A (en) | Dynamic measurement method and device of effective service life of laser upper energy level | |
| Lü et al. | Dual-wavelength laser operation at 1064 and 914 nm in two Nd: YVO 4 crystals | |
| CN101592845B (en) | Dual-wavelength tunable inner cavity tera-hertz parametric oscillator and using method thereof | |
| CN102684061B (en) | All solid-state angular momentum tunable laser device with stable pulse energy | |
| CN102646920A (en) | Intracavity-frequency-doubling 532nm single-longitudinal-mode laser based on seed light injection | |
| CN102208745A (en) | Miniaturized passive Q-switching eye-safe Raman laser | |
| Huang et al. | Resonantly pumped Er: YAG laser Q-switched by topological insulator nanosheets at 1617 nm | |
| CN105811231A (en) | Volume Bragg grating high-energy pisosecond laser | |
| Yao et al. | Diode pumped operation of Tm, Ho: YAP microchip laser | |
| CN203645130U (en) | High-power glass-doped laser device | |
| Zhu et al. | High average power passively Q-switched laser diode side-pumped green laser by using Nd: YAG/Cr4+: YAG/YAG composite crystal | |
| Fan et al. | Diode pumped passively Q-switched Nd: YAG/Cr: YAG solid-state lasers with a stable output of millijoules at 1064 nm over a wide temperature range | |
| Wang et al. | Continuous-wave and pulsed operation of a ring laser cavity with the Ho: YLF and Ho: YAG crystals | |
| Ma et al. | Diode-pumped acousto-optically Q-switched laser with Nd3+ doped GdYNbO4 mixed crystal | |
| Xu et al. | A 6.5 ns gain-switched electro-optical Q-switched Nd: YAG laser by 885 nm laser diode pulsed-end pumping | |
| Feng et al. | Graphene oxide saturable absorber on golden reflective film for Tm: YAP Q-switched mode-locking laser at 2 μm | |
| Duan et al. | High-power resonantly pumped passively Q-switched Ho: GdVO 4 laser | |
| Shen et al. | 108-W diode-end-pumped slab Tm: YLF laser with high beam quality | |
| Han et al. | High power slab Tm: YAP laser dual-end-pumped by fiber coupled laser diodes | |
| Yin et al. | Semiconductor saturable-absorber mirror passively Q-switched Yb: YAG microchip laser | |
| Zhou et al. | Continuous-wave and passively Q-switched c-cut Nd: CTGS laser | |
| Ren et al. | Transient thermal effect analysis and laser characteristics of novel Tm: LuYAG crystal | |
| Jambunathan et al. | Diode-pumped continuous-wave laser operation of co-doped (Ho, Tm): KLu (WO4) 2 monoclinic crystal | |
| Quan et al. | Performance of a 968-nm laser-diode side-pumped, electro-optical Q-switched Er, Pr: YAP laser with emission at 2.7 μ m | |
| Zhang et al. | Passively Q-switched 1617-nm polycrystalline ceramic Er: YAG laser using a Cr: ZnSe saturable absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100901 |