Method of adjustment of laser diode temperature and device for effecting same

专利摘要:
This invention relates to methods and devices for controlling the temperature of laser diodes used in printing devices. The purpose of the invention is to increase the reliability of the laser diode by increasing the accuracy of temperature control and simplify the method. To do this, after each pump pulse, a direct current is passed through the laser diode, the magnitude of which is less than the pump current, the voltage on the laser diode is measured in the time interval 200 to 300 ns after the end of the pump pulse and the resulting voltage is used to control the pump current of the laser diode. The device contains a pump current source 2, a device for controlling 8 the temperature of the laser diode, a voltage follower 3, a read and store unit 4, an evaluation unit 5, a delay unit 6, a logic unit 7, the input of the voltage follower 3 connected to the laser diode, output of repeater 3 is connected to unit 4, which is connected to the input of evaluation unit 5 and output of delay unit 6, the output of evaluation unit 5 is connected to the input of the pump current source 2 and to a device for controlling the temperature of the laser diode, logic unit 7 is connected to the input of the unit and delays 6 and with the second input of the source of the pumping current 2. 1 sludge.
公开号:SU1530104A3
申请号:SU864023034
申请日:1986-02-19
公开日:1989-12-15
发明作者:Сираньи Тамаш
申请人:Видеотон Электроникай Валлалат (Инопредприятие)；
IPC主号:

专利说明:


cm
The invention relates to methods for determining and controlling the temperature of a semiconductor (1x laser diodes, in particular, applied and laser xerographic printing devices of laser diodes of the type GaAs L1 / P, the laser diode operating in a pulsed mode.
The purpose of the invention is to increase the reliability of the laser diode by improving the accuracy of temperature control and simplify the method.
The drawing shows a block diagram of a property for controlling the temperature of a laser diode.
The device includes a laser diode 1, a pumping current source 2, a high input impedance voltage follower 3, a read and memorize unit 4, a faint 5 evaluation, a delay unit 6, a logic unit 7, and a laser temperature control unit 8 of the diode.
The method is as follows;
When the laser diode operates in a pulsed mode, the temperature of the laser diode is determined by skipping over :; the diode is a constant current, less than the threshold, in the intervals between the power pulses and the measurement of the voltage on the laser diode. The voltage across a laser diode when a direct current is passed through it depends on the temperature. The voltage is measured after 200-300, not after the termination of the next pump pulse. This provides the greatest confidence. The measured voltage is then used to control the pump current of the laser diode.
The device works in the following way.
Laser diode 1 is powered by current source 2. The current source 2 is designed as a current generator controlled with an accuracy of t.0.1 mA.
The laser diode 1 is connected to a voltage follower 3 with a high input resistance. The output of the voltage follower 3 is connected to the reading unit 4 and memorizing 1P1, the output of which is connected to the evaluation unit 5. The output of the evaluation unit 5 is connected to the control input of the laser diode 1 of the current source 2 and to the control unit 8. The control input of the block 4 read and store} 1 through the block
6 delays are connected to logic block 7, which can be made on the basis of conventional, 1x logic circuits. Another output of logic block 7 is connected to the second control input of current source 2. The inputs of logic unit 7 are connected to other units of the printing device (not shown).
Q The operating current of the laser, depending on the type of laser diode, is 50–200 ml. Between the pulses of the operating current a constant current is passed through the laser diode, the magnitude of which
.5 below threshold
Mi iioBOHHt e the voltage on the laser diode 1 is fed through the repeater 3 voltage, made with high input impedance, to block 4
Q readout and agsm. 1) LT1 filled with BiiicoiafM T resistance resistance repeater 3 voltage serves to block | at1 gdzdaGrs tppyu unit 4 for the operation of the laser diode 1.
5 Setting the moment 1: the voltage across the laser diode / tp is made using logic block 7.
Between the lot 7 and the block 4 BKJiioMCH block 6 delay. It is designed to eliminate voltage fluctuations that occur when current changes when the laser mode is turned on and off, and affect the measured voltage level 5 when measuring the temperature at the ground current n, thus measuring (; rkii. time delay}): 200-300 no. The output of unit 4 is ps connected to unit 5, which, when onacHoii d.1t of the laser diode, sets the temperature of current diode 2 by means of controlling diode 2 and temperature control 8 laser diode current 1 equal to its main well meaning.
With the help of a prelude, you can use the carpet (5 liter. 1. Temperature of the laser diode without the use of temperature measurement of 1 element. In addition, when los: liujsnpi dangerous for the impact on the laser diode temperature, control: 1 1 laser output, its mole ; but vslump ii to U11ovn the main current). B. For example, a laser diode from overburning and also from a laser diode at its gi.s;) .-; mzh.i Pii.
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权利要求:
Claims (3)
[1]
Invention Formula
one . A method of controlling the temperature of the laser diode, including supplying the pump current to the laser diode and controlling the pump current, characterized in that, in order to increase the reliability of the laser diode due to the accuracy of temperature control and simplification of the method, the pump current pulses are applied to the laser diode the pulse of the pump current passes a constant current through the laser diode, the magnitude of which is less than the threshold pump current, and the voltage on the laser diode is measured preferably in the time interval 200-300 NS le completion of the pump pulse and the received voltage controlling the current of the laser diode pumping.
[2]
2. A device for controlling the temperature of a laser diode containing a pumping current source, a feedback unit including a device for controlling the temperature of a laser
) 104
A diode, characterized in that, in order to ensure the reliability of the laser diode by increasing the accuracy of the temperature control and simplifying the method, a voltage repeater with a high input resistance is introduced into the feedback unit, the evaluation unit, a delay unit, a logic unit, with the voltage follower input connected to a laser diode, a repeater output connected to a read and memorize unit, 5 which is connected to the input of the evaluation unit and to the output of the delay unit, the output of the evaluation unit to the input of the pump current source and with a device for controlling the laser diode temperature, the logic unit is connected to the input of the delay unit and the second input of the pumping current source.
[3]
3. A device according to claim 2, characterized in that the pump current source is made in the form of a current generator controlled with an accuracy of ± 0.1 mA.
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US4215577A|1978-08-28|1980-08-05|Purdue Research Foundation|Utilization of diodes as wide range responsive thermometers|

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DE2911858C2|1979-03-26|1983-01-13|Robert Bosch Gmbh, 7000 Stuttgart|Circuit for limiting the light output emitted by a semiconductor laser|

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GB2054949B|1979-07-26|1983-04-07|Standard Telephones Cables Ltd|Cooling arrangement for laser diode|

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DE19617552A1|1996-05-02|1997-11-06|Heidelberger Druckmasch Ag|Method and device for regulating the temperature in a printing plate labeling unit working with laser light, in particular an offset printing machine|

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DE19828427A1|1998-06-25|2000-02-10|Litef Gmbh|Method to control wavelength of radiation emitting semiconductor component, e.g. superluminescence or laser diode, where emission wavelength depends both on its temperature and current|

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DE19839088B4|1998-08-27|2006-08-03|Avalon Photonics Ltd.|Apparatus and method for temperature stabilization of a semiconductor light emitting device|

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DE10042022A1|2000-08-08|2002-03-07|Infineon Technologies Ag|Method and device for measuring the temperature of the laser-active region of a semiconductor laser diode|

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DE10244700A1|2002-09-24|2004-04-01|Bktel Communications Gmbh|Operating point stabilization for laser transmitter in optical telecommunications system provided by temperature regulation device controlled for maintaining required laser transmitter oscillation frequency|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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HU59785A|HUT39871A|1985-02-19|1985-02-19|Method for measuring the temperature of semiconductor laser diode and circuit arrangement for carrying out thereof|

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