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Table of Contents
Summary of Contents for OsTech Laser Lab Source LDI Series
- Page 1 Operating Manual LDI, LDC and TEC Series Laser Diode Drivers and TEC Controllers...
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Page 3: Overview
Overview The LDC and TEC series laser diode drivers and TEC controllers are designed to precisely and reliably drive diode lasers and Peltier cooler elements. They are available as bench- top units and as OEM units. All devices have an integrated QCW pulse generator and can be run from QCW pulsed to CW mode. - Page 4 TEC Controller Features • Thermosensor input for NTCs (standard 10 kΩ), PT100, PT1000 or others • Polynomial and Steinhart-Hart sensor model • PID temperature controller for TEC coolers • Voltage, current and temperature limits • Target temperature sequencer on request...
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Page 5: Table Of Contents
Contents Overview Contents 1 Introduction 2 Technical parameters General parameters ......Laser module . - Page 6 Contents 5.4.3 External analog modulation ..... Pilot laser control ....... 6 Temperature controller and sensors PID controller parameters .
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Page 7: Introduction
The operating instructions should be followed for safe operation and optimum performance of the laser diode. In case of questions or problems, please contact Laser Lab Source in North America or our service staff at OsTech in Europe. North America: Laser Lab Source / LaserDiodeControl.com contact@laserlabsource.com 800-877-5065... -
Page 8: Technical Parameters
2. Technical Parameters 2.1 General Parameters FOR ALL MODELS input voltage DS01: 24 V DC DS11: 110–220 V AC ambient temperature 40 C humidity housing size width×height×depth (depth without connectors) o44 housing 105 mm 44 mm 160 mm (4.1 in 1.7 in 6.3 in) o85 housing... -
Page 9: Security Breakdown Conditions
accuracy laser diode voltage min. 1.2 V max. 3 6 9 12 15 18 24 48 V current noise 0.01 % of I internal pulse mode pulse width range (model specific) 10 µs µs (71 min) pulse period range pulse width 100 µs µs (71 min) time base... -
Page 10: Peltier Module
2.3 (Model Specific) TEC Controller peltier current range 16 A accuracy /4000 peltier voltage max. 4 8 14 18 24 48 V temperature controller range −25 C 150 C, larger on request accuracy typical: 10 mK max.: 100 mK temperature limits range −25 C 150 C... -
Page 11: Keypad And Display Menus
3. Keypad and Display Menus 3.1 Keypad • increases the digit under the cursor DOWN • decreases the digit under the cursor LEFT • moves to the previous input field, unsaved changes are discarded RIGHT • moves to the next input field, unsaved changes are discarded OK or Enter •... -
Page 12: Laser Menu
switch the laser on and off, can only be changed if the device has Laser On no separate laser switch laser current target laser voltage actual laser current bias (for modulation) modulation mode CW Mode, ... Mod. switch the TEC controller on and off TEC On target temperature TT, LTT, CTT... -
Page 13: Tec Menu
laser current limit compliance voltage ( laser voltage actual laser current bias (for modulation) limit for average laser current (for modulation) LCLM laser temperature maximum, laser stops above this temperature error number (0 = no error) Error# no modulation CW Mode external analog modulation LMAX external digital modulation... -
Page 14: Device Menu
TEC voltage actual TEC controller is automatically activated when the temperature is TC Auto On whithin limits restores the default settings for the TEC controller Restore Def. upper temperature limit lower temperature limit set the PID coefficents (see figure 3.3b) PID parameters select one of some predefined temperature sensor settings (see Select Sensor... - Page 15 default fan voltage Reset all settings in the device to their default values. Restore Default Settings Show type, serial number and software version of the device. Service Figure 3.4: Device menu.
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Page 16: Hardware Setup Preparations
4. Hardware Set-Up Preparation These steps must be followed: • Make sure that the power supply is disconnected from your main power supply. • Use an approved personal grounding bracelet or other means for ESD protection during the assembly of the laser or other electronics. •... -
Page 17: Laser Control
5. Laser Diode Current 5.1 Preparations First the laser current limit and the laser compliance voltage must be configured. To adjust the laser current limit using the display: • go to the by pressing Laser Menu • go to the input field by pressing to adjust the laser current limit •... -
Page 18: Ramp On Laser Switching
Laser : 0 . . . 34000 ms LZTR (default: 300 ms) LZTR LZTR Figure 5.1: Laser current on-off ramp in CW mode. The ramp is active at any change of laser current. When using the RS232 interface the command may be used to switch the laser on. -
Page 19: Gate Option
5.3 Gate option Before turning the laser diode on you must connect the photo-sensor between the PDC (cathode) and the GND (anode) pins at the laser connector. After this you should test whether the sensor is working. For this step, run the laser and check with the command (laser photo-current actual). -
Page 20: Internal Digital Modulation Mode
laser laser current target – : 100 . . . 2 µs : 200 . . . 2 µs + 100 µs ≥ laser bias current – Figure 5.2: continuous pulse mode menu show the mean values not the peak values. These measured values may differ from the adjusted ones caused by the low speed of the AD converter. -
Page 21: External Digital Modulation
as in continuous pulse mode LMDIC 0 . . . 64000 continuous pulse mode LMDIC single pulse mode LMDIC = 2 . . . 64000 n-pulses mode LMDIC LMDIC Figure 5.3: single pulse mode, n-pulses mode the number of pulses will be generated. Afterwards, the driver enters the OFF state automatically. -
Page 22: Pilot Laser Control
5.5 Pilot Laser Control These laser diode drivers support an internal pilot laser. One pin on the laser & peltier connector is reserved for this purpose. In ON state a voltage between 4.0 and 5.0 V is applied. The maximum output current is 150 mA. In OFF state the output is near 0 V level. -
Page 23: Temperature Controller And Sensors
6. TEC Controller and Temperature Sensors As some models may have more than one TEC controller, the temperature sensor or TEC controller is selected by a prefix, in this chapter written as x. So, x has to be replaced by a digit (or letter) to select the temperature sensor or TEC. -
Page 24: Temperature Sensor
3-wire option for PT100 R = 4, 27 kΩ SSUP SINP ϑ DRIVER PLUG CABLE SENSOR Figure 6.1: schematic for connecting a temperature sensor 0.2. . . 5 TCCK 5. . . 50 TCCN 0.2. . . 2 TCCV If you don’t know anything about the TEC circuit, you may set xTCCK = 0.2, xTCCN = 2 and xTCCV = 0.1. - Page 25 6.2 Temperature sensor The default coefficients c and c of this polynomial correspond to an NTC with 10 k at 25 C which is a wide spread standard. You may adjust these coefficients to a different sensor by the commands x .
- Page 26 For tolerances of real sensors you may need to calibrate the setup point of your sensor by adding the difference between the real temperature and the shown temperature to the absolute part x TSC0 If you need assistance in connecting your sensors or you want to assemble any other sensor to the driver we would be pleased to assist you in finding the appropriate coefficients.
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Page 27: Remote Control
7. Remote Control All models may be controlled over a serial interface. The transfer parameters of the serial interface are fixed to 9600 baud 8N1. 7.1 Standard Mode In standard mode you can send commands and parameters to the device in text format and the device answers in the same way. -
Page 28: Binary Mode
GMC8 clear bit 0x08 of mode variable 7.4 Software http://www.ostech.de you may download software to interact with OsTech devices. • the terminal program OSTERM • LabVIEW™ VIs, including a runtime version Sample routines in C and C++ are also available on request. -
Page 29: Error Codes
8. Error Codes When an error occurs, the driver generates an error code. The error code can be determined by the command. Furthermore, the error is shown on the display. A list of error codes and their causes follows: error code cause no error interlock open... -
Page 30: Command Reference
9 Command References 9.1 Laser Commands (L) type default unit description bool laser stop/run float laser temperature maximum bool gate option 9.1.1 Laser Current Commands ( type default unit description float current limit float current target float actual current — no parameter — float base or bias current 9.1.2 Laser Coltage Commands (... -
Page 31: Laser Modulation Commands Lm
9.1.4 Laser Modulation Commands type default unit description bool internal digital modulation LMDI bool external digital modulation LMDX bool external analog modulation LMAX float 1000000 1000 pulse width float 600000000 2000 pulse period word 65534 number of pulses LMDIC word 65534 number of suppressed pulses LMDIO... -
Page 32: Temperature Sensor Commands
As the first temperature sensor or TEC is usually used for a laser and the second for a crystal, a deprecated option for selecting them is the use of the letters respectively. 9.2.1 Temperature Sensor Commands In new firmware versions t he s ensor c ommands a re a lso available w ith p refix n instead of x where n corresponds to the number of the temperature sensor. -
Page 33: Status Command
type default unit description float default fan voltage bool external control stop/run float device temperature (head) — no parameter — word software version — no parameter — word serial number — no parameter — 9.3.1 Status Commands type default unit description word get status... - Page 34 0x0040 0x4000 gate option LMDX 0x0080 0x8000 reduced mode LMAX...
- Page 36 Copyright © 2009-2020 OsTech e. K. Version 1.2 2016-06...
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