CN1055065A - The continuous wave electro-optical detecting technology is measured the method and the device thereof of semiconductor laser Electric Field Distribution - Google Patents
The continuous wave electro-optical detecting technology is measured the method and the device thereof of semiconductor laser Electric Field Distribution Download PDFInfo
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- CN1055065A CN1055065A CN 91101294 CN91101294A CN1055065A CN 1055065 A CN1055065 A CN 1055065A CN 91101294 CN91101294 CN 91101294 CN 91101294 A CN91101294 A CN 91101294A CN 1055065 A CN1055065 A CN 1055065A
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Abstract
The continuous wave electro-optical detecting technology is measured the method and the device of semiconductor laser field distribution: the method feature is the in running order tested semiconductor laser of the vertical cleavage plane transmission of exploring laser light, and the laser that itself sends is through separating and/or elimination; Device characteristic is to set up microscopic system, beam split and/or filtering apparatus between semiconductor laser and analyzer, to semiconductor laser the adjustable bias current source is set.This device can directly be measured the field distribution of semiconductor laser, determines its carrier confinement, current expansion characteristic, for the design and making foundation and monitoring are provided.Advantage is a non-destruction, noiseless, resolution and highly sensitive.
Description
The present invention relates to the measuring technique of Electric Field Distribution, specifically, it relates under the duty measuring method of Electric Field Distribution and device in the semiconductor laser.
At present, the quality of semiconductor laser performance is normally waited by volt-ampere characteristic, luminous power-current characteristics and threshold current density, mode characteristic, spectral characteristic and live width to characterize.But noise spectra of semiconductor lasers, its carrier confinement characteristic, promptly to injecting the power of carrier confinement ability, and the size of injection current expansion, quantum efficiency, threshold current density, luminous power-current characteristics, pattern and temperature characterisitic etc. direct and semiconductor laser are closely related, so people have designed the limited characteristic that various structure is improved the semiconductor laser charge carrier.
In the past, during the designing semiconductor laser instrument, the someone adopts numerical analysis method, utilizes computer mould to draw up wherein Electric Field Distribution as foundation.But the model of supposing normally is similar to, and condition is Utopian, so there is difference in the situation of Simulation result and practical semiconductor laser instrument.For each concrete semiconductor laser of making, because the problem of process repeatability, situation is far from each other especially.
The continuous wave electro-optical detecting technology that is developed by the inventor is a kind of steady-state field new measurement method that is applicable to, its measuring method and experimental provision are with behind the exploring laser light collimation, focus on the sample with Electric Field Distribution, exploring laser light is parallel with electric field, become vertical electric light reflection detection mode, variation through the exploring laser light polarization of electric field modulation in the sample, change the variation of laser intensity into, become electric signal by photodetector again, the input lock-in amplifier is read, by the variation of beam splitter,, thereby reduce to change the error that causes because of light intensity itself with this photosignal that comes normalizing to record with the intensity of light power meter monitoring exploring laser light own.With the scanning survey position of infrared video camera monitoring exploring laser light on sample.This device is made up of laser instrument, collimator objective, quarter wave plate, focusing objective len, sample, analyzer, beam splitter, light power meter, photodetector, lock-in amplifier, infrared video camera.The measurement Research that now has been used for some GaAs waveguide devices and material Electric Field Distribution.But this device can't be directly used in the measurement of semiconductor laser Electric Field Distribution under the duty.In the past, people inferred the situation of its carrier confinement and current expansion indirectly just from the measurement of characteristics such as the volt-ampere of semiconductor laser, luminous power-electric current, pattern.
In view of the foregoing, purpose of the present invention is intended to propose to use the continuous wave electro-optical detecting technology, directly measure method and the device that semiconductor laser descends internal electric field to distribute in working order, describe its inner Electric Field Distribution, to determine its carrier confinement and current expansion characteristic.
The present invention measures according to the linear electro-optic effect principle.The objective of the invention is to realize by following method and apparatus.
Semiconductor laser descends the measuring method feature of Electric Field Distribution to be in working order: chip, its direction and tested direction of an electric field quadrature are passed through in the exploring laser light vertical transmission on the cleavage plane of tested semiconductor laser chip that focuses on; The laser that tested semiconductor laser self sends is through separating and/or elimination.
The measurement mechanism feature that realizes said method is: set up a microscopic system, beam split and/or filtering apparatus between tested semiconductor laser and analyzer.Make microscopic system have long operating distance, and can utilize infrared video camera to monitor each measured position of tested semiconductor laser easily; Separated and/or the elimination of laser that tested semiconductor laser self in the laser optical path is sent only allows exploring laser light pass through.Be provided with an adjustable bias current source for tested semiconductor laser.It comprises the biasing of adjustable forward dc and is superimposed upon an adjustable low-frequency ac biasing in the forward dc biasing, makes tested semiconductor laser reach on the threshold value and makes above-mentioned adjustable low-frequency ac offset signal supply with lock-in amplifier simultaneously along separate routes.Make tested semiconductor laser in running order, form steady-state field and distribute; It is in order to guarantee the lock-in amplifier co-ordination that the low-frequency ac offset signal is exported along separate routes.
Utilize the continuous wave electro-optical detecting technology to measure Electric Field Distribution in the semiconductor laser, determine its carrier confinement, current expansion characteristic, for the design and the making of semiconductor laser provides foundation and monitoring.This method and device have to tested semiconductor laser do not contact, non-destruction, noiseless; All high to Electric Field Distribution measurement spatial resolution and sensitivity; Advantages such as measurement mechanism is simple, small investment.
Fig. 1 is a principle schematic of the present invention.
Fig. 2 is the synoptic diagram of the tested semiconductor laser chip cleavage plane of the vertical transmission of exploring laser light.
Fig. 3 is the block scheme in adjustable bias current source.
Fig. 4 is the Electric Field Distribution curve that records.
Describe optimum implementation of the present invention in detail below in conjunction with each accompanying drawing.
With reference to Fig. 1, Fig. 2, Fig. 3, between analyzer 11 and photodetector 13, can set up a focusing objective len 12, exploring laser light is focused on the photodetector 13, make that exploring laser light is more to be received by photodetector 13.Between collimator objective 2 and quarter wave plate 4, can set up a polarizer 3, constant to guarantee exploring laser light linear polarization characteristic, make the polarization direction of analyzer 11 and the polarization direction quadrature of polarizer 3.Between beam split and/or filtering apparatus 8 and analyzer 11, a beam splitter 9 can be set, make exploring laser light 20 tell directive light power meter 10, its reading is used to record the normalizing of electro-optical signal, and this can reduce owing to reflection and body inscattering on the semiconductor laser chip cleavage plane, absorb the error that the different light intensity variations that cause itself bring to measurement result.Quarter wave plate 4 also can be arranged between beam splitter 9 and the analyzer 11.Its effect is along the phase shift of introducing a pi/2 of fixing between two quadrature induction main shaft electric field components at exploring laser light.I
nG
aA
sThe P semiconductor laser is exploring laser light source 1, and its excitation wavelength is 1.3 μ m, and maximum Output optical power continuously is 10mw.Require the excitation wavelength of its excitation wavelength, for guaranteeing that obtaining the enough strong continuous Output optical power of electro-optical signal generally is not less than 5mw greater than tested semiconductor laser 6.Its emitted laser, through collimator objective (20 *) 2 collimations, guarantee that by polarizer 3 the laser rays polarization characteristic is constant, line focus object lens (40 *) 5 focus on laser beam on the chip 17 of tested AlGaAs semiconductor laser 6 then, the exploring laser light polarization direction is at 45 with X-axis in cleavage plane, and exploring laser light 20 passes through from the vertical transmission of chip 17 cleavage planes.Bias current sources 15 is received tested AlGaAs semiconductor laser 6 by electrode 18 and heat sink 19 makes it in running order, produces consistent electric field in its chip and distributes.Be subjected to the exploring laser light 20 of electric field modulation in tested AlGaAs semiconductor laser 6 chips 17, after entering a microscopic system 7 that comprises object lens, stationary mirror, mobile mirror and eyepiece after the outgoing, when mobile mirror inserts light path, it is with regard to beam split and/or filtering apparatus 8 through saturating anti-mirror and optical filter composition, make laser that exploring laser light 20 and AlGaAs semiconductor laser 6 send in apart, again through the remaining non-exploring laser light of optical filter elimination.By beam splitter 9, tell part exploring laser light 20 directive light power meters 10, the electro-optical signal that comes normalizing to record by its luminous power of reading.See through most exploring laser lights 20 of beam splitter 9, through mica quarter wave plate 4 and analyzer 11, make the polarization variations of exploring laser light 20 change the variation of light intensity into after, focus it on the photodetector 13 through object lens 12 again.After by photodetector 13 intensity variation of exploring laser light 20 being become the variation of electric signal, be input to lock-in amplifier 14, directly read the electro-optical signal that is directly proportional with electric field intensity.Adjustable bias current source 15 is made up of audio signal generating circuit 21, double limiting circuit 22, voltage amplifier circuit 23, buffer amplifier circuit 24 and driving circuit 25.It can provide adjustable forward dc biasing and low-frequency ac biasing, and their adjustable extent is 0～100mA.Audio signal generating circuit 21 is audio signal generator or standard signal generator.The effect of double limiting circuit 22 is to avoid the unexpected increase of input signal to cause the damage of tested AlGaAs semiconductor laser 6, and provides the measurement electric current of alternation for it.Driving circuit 25 comprises that direct current biasing is regulated, AC driving adds circuit and tested AlGaAs semiconductor laser reverse protection circuit.In a single day mobile mirror in microscopic system 7 shifts out light path, and infrared video camera 16 just can be monitored measuring position and other situation of exploring laser light in tested AlGaAs semiconductor laser 6 chips.
According to above-mentioned detection mode, move tested AlGaAs semiconductor laser 6, when allowing on the exploring laser light Shu Zaiqi chip cleavage plane, just recorded the electric field E in AlGaAs semiconductor laser 6 chips along X-axis and Z-direction scanning
ZDistribution on the transversal section.Its size has directly reflected the size of current and the direction of tested AlGaAs semiconductor laser 6 chips of vertical injection, i.e. current expansion and carrier confinement situation.
With reference to Fig. 4, horizontal ordinate is the distance along chip cleavage plane directions X, and ordinate is the electro-optical signal that measures.The upper right corner is depicted as the transversal section of tested AlGaAs semiconductor laser 6 chips among the figure, and the scanning pattern of exploring laser light 20 when measuring.A shown in the figure, b, three curves of c are represented respectively in chip thickness direction (Z direction) three electro-optical signals that the different parts place obtains along the directions X scanning survey, the i.e. distributions of electric field intensity.The result that curve a representative obtains along X-direction scanning near active layer; The result that active layer different-thickness place obtains along X-direction scanning is left in curve b, c representative.The zone of electric field intensity maximum is corresponding with the position of active layer luminous zone among the curve a.This shows that smooth more away from its curve of active layer, this has shown the spread scenarios of injection current.
Claims (10)
1, utilize the continuous wave electro-optical detecting technology to measure the method for semiconductor laser Electric Field Distribution, after exploring laser light is collimated, focus on the sample with Electric Field Distribution, variation through the exploring laser light polarization of electric field modulation in the sample, change the variation of laser intensity into, become electric signal by photodetector again, the input lock-in amplifier is read, with the scanning survey position of infrared video camera monitoring exploring laser light on sample, it is characterized in that described sample is in running order semiconductor laser, the exploring laser light that focuses on is vertical transmission on the cleavage plane of its chip, its direction and tested direction of an electric field quadrature, the laser that tested semiconductor laser itself sends is through separating and/or elimination.
2, use the described method of claim 1 and custom-designed measurement mechanism, comprising laser instrument (1), collimator objective (2), quarter wave plate (4), focusing objective len (5), sample, analyzer (11), photodetector (13), lock-in amplifier (14), infrared video camera (16), it is characterized in that described sample is semiconductor laser (6), between itself and analyzer (11), set up a microscopic system (7), beam split and/or filtering apparatus (8), be provided with one for tested semiconductor laser (6) and contain the forward dc biasing and the low-frequency ac biasing reaches on the threshold value it, and make the shunt simultaneously of above-mentioned low-frequency ac offset signal supply with the adjustable bias current source (15) of lock-in amplifier (14).
3, measurement mechanism according to claim 2 is characterized in that can setting up a focusing objective len (12) between analyzer (11) and the photodetector (13).
4, according to claim 2 or 3 described measurement mechanisms, it is characterized in that can setting up a polarizer (3) between collimator objective (2) and the quarter wave plate (4), make polarization direction and its polarization direction quadrature of analyzer (11).
5,, it is characterized in that adjustable bias current source (15) is made up of audio signal generating circuit (21), double limiting circuit (22), voltage amplifier circuit (23), buffer amplifier circuit (24) and driving circuit (25) according to claim 2 or 3 described measurement mechanisms.
6, measurement mechanism according to claim 4 is characterized in that adjustable bias current source (15) is made up of audio signal generating circuit (21), double limiting circuit (22), voltage amplifier circuit (23), buffer amplifier circuit (24) and driving circuit (25).
7,, it is characterized in that to be provided with between beam split and/or filtering apparatus (8) and the analyzer (11) beam splitter (9) that makes exploring laser light (20) tell directive light power meter (10) according to claim 2 or 3 or 6 described measurement mechanisms.
8, measurement mechanism according to claim 4 is characterized in that can being provided with between beam split and/or filtering apparatus (8) and the analyzer (11) beam splitter (9) that makes exploring laser light (20) tell directive light power meter (10).
9, measurement mechanism according to claim 5 is characterized in that can being provided with between beam split and/or filtering apparatus (8) and the analyzer (11) beam splitter (9) that makes exploring laser light (20) tell directive light power meter (10).
10,, it is characterized in that quarter wave plate (4) also can be arranged between beam splitter (9) and the analyzer (11) according to claim 2 or 3 or 6 or 8 or 9 described measurement mechanisms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91101294 CN1016998B (en) | 1991-02-26 | 1991-02-26 | Method and device for measuring electric field distribution of semiconductor laser in working order |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91101294 CN1016998B (en) | 1991-02-26 | 1991-02-26 | Method and device for measuring electric field distribution of semiconductor laser in working order |
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| Publication Number | Publication Date |
|---|---|
| CN1055065A true CN1055065A (en) | 1991-10-02 |
| CN1016998B CN1016998B (en) | 1992-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91101294 Expired CN1016998B (en) | 1991-02-26 | 1991-02-26 | Method and device for measuring electric field distribution of semiconductor laser in working order |
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| CN (1) | CN1016998B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333446C (en) * | 1999-08-18 | 2007-08-22 | 株式会社半导体能源研究所 | Laser equipment and laser annealing method |
-
1991
- 1991-02-26 CN CN 91101294 patent/CN1016998B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333446C (en) * | 1999-08-18 | 2007-08-22 | 株式会社半导体能源研究所 | Laser equipment and laser annealing method |
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| Publication number | Publication date |
|---|---|
| CN1016998B (en) | 1992-06-10 |
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