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DATASHEET AND OPERATING GUIDE
Low-Noise Quantum Cascade Laser Driver
LOWEST-NOISE DRIVER AVAILABLE
The QCL OEM Series drivers use patented
produce the lowest current noise density of any commercially
available QCL driver. The 500 mA QCL driver exhibits noise
performance of 0.4 μA RMS to 100 kHz, and average current
noise density of 1 nA / √Hz-the lowest available.
ULTRA-NARROW QCL LINEWIDTH
In order to maintain their characteristically tight center
linewidths and minimize jitter, quantum cascade lasers must
be powered by drivers with exceptionally low current noise
density. Our customers have reported achieving narrower
linewidths with these drivers than any other they've used.
1. Covered by U.S. Patents 6,696,887; 6,867,644 and 7,176,755. Licensed from
Battelle Memorial Institute.
CONTENTS
www.teamWavelength.com
QCL OEM Series
circuitry to
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Applies to Product Revisions A - D
© March 2019
FEATURES AND BENEFITS
• Off-the-shelf models at 500 mA, 1 A, 1.5 A, 2 A
• Can be delivered in other current ranges up to 2 A
• Compliance voltage 16 V (standard),
Compliance 7-20 V with factory modification
• Safety features protect your QCL investment
» Adjustable soft-clamping current limit
» Brown-out, reverse-voltage, & over-voltage
protection
» Driver over-temperature protection circuit
» Relay shorts output when current is disabled
• Local and Remote Power-On and Enable control
• Analog modulation input between -5V and +5V
APPLICATIONS
The QCL Series drivers are used in trace element detection
systems, both laboratory-based and field-deployed.
This driver is well suited to applications requiring fast
measurement times and ultra high sensitivity.
REVERSE POLARITY AVAILABLE
Often, with epi-down configurations of a QCL, the exit
lead is attached to the case and it is desirable to ground
it. Now, the reverse polarity driver, a current source, is
also available in the OEM package. See QCL OEM(+).
PROTECT YOUR QCL INVESTMENT
All the essential control and monitor functions you expect in
a Wavelength laser driver are incorporated into this driver,
along with protection circuitry to safeguard your QCL from
minor power source faults, over-temperature conditions,
and electrical faults.
ORDERING INFORMATION
PART NO
DESCRIPTION
QCL500 OEM
500 mA Low Noise QCL Driver
QCL1000 OEM
1.0 A Low Noise QCL Driver
QCL1500 OEM
1.5 A Low Noise QCL Driver
QCL2000 OEM
2.0 A Low Noise QCL Driver
QCL OEM(+) Series
Positive polarity OEM models
24 VDC switching power supply
PWRPAK-24V
(2x required)
WCB312
Dual power supply wiring kit
NOISESCAN
Noise characterization scan
55-110014
SMA-BNC low noise cable
WCB310
SMA-SMA low noise cable
QCLTL Series
Test load kits for the QCL OEM
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Table of Contents
Related Manuals for Wavelength Electronics QCL OEM Series
Summary of Contents for Wavelength Electronics QCL OEM Series
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Page 1: Table Of Contents
• Analog modulation input between -5V and +5V LOWEST-NOISE DRIVER AVAILABLE APPLICATIONS The QCL OEM Series drivers use patented circuitry to The QCL Series drivers are used in trace element detection produce the lowest current noise density of any commercially systems, both laboratory-based and field-deployed. -
Page 2: Quick Connect Guide
For setup and configuration, we recommend using a test load in place of the laser (Figure 3). Recommended test Visit the Wavelength Electronics website for the most load for 0 to 1.5 A operation, R = 10 Ω, 50 W, metal... -
Page 3: Pin Descriptions
QCL OEM SERIES LOW-NOISE DRIVER PIN DESCRIPTIONS Table 1. Pin Descriptions, WCB31X Cable Descriptions NAME SYMBOL COLOR PIN DESCRIPTION Connector J1, WCB311 14-Pin Input/Output Cable Analog In GND Ground for analog setpoint input. Pin is not rated for high current return. - Page 4 QCL OEM SERIES LOW-NOISE DRIVER PIN DESCRIPTIONS (CONTINUED) Table 2. Front Panel SMA Connector Descriptions FRONT-PANEL SMA CONNECTORS Analog setpoint input. The voltage input on this pin sums with the onboard setpoint trimpot. Left SMA, Center Pin Analog In Input impedance 1 kΩ. Transfer function varies by model—refer to Table 3. The analog input voltage can be negative.
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Page 5: Electrical Specifications
QCL OEM SERIES LOW-NOISE DRIVER ELECTRICAL SPECIFICATIONS PARAMETER UNIT NOTE SYMBOL ABSOLUTE MAXIMUM RATINGS If a Product Variation modified your QCL OEM, maximum ratings change: PV # MA X V COMPLIANCE Positive Supply Voltage +24 / PV055 PV066 ±15 PV072 ±19... - Page 6 5. See technical note TN-LD02: “How is Current Noise Measured at Wavelength Electronics?” 6. We recommend that setpoint is below 85% of the current limit, because the noise level introduced into the QCL rises when operating close to the current limit.
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Page 7: Safety Information
QCL OEM SERIES LOW-NOISE DRIVER SAFETY INFORMATION THEORY OF OPERATION The QCL Series low noise drivers are designed expressly SAFE OPERATING AREA — DO NOT EXCEED to drive quantum cascade lasers, and utilize patented INTERNAL POWER DISSIPATION LIMITS circuitry to deliver ultra-low noise current and still maintain a wide modulation bandwidth. -
Page 8: Operating Instructions
QCL OEM SERIES LOW-NOISE DRIVER OPERATING INSTRUCTIONS PREVENT DAMAGE FROM ELECTROSTATIC DISCHARGE These instructions are written for the most common Before proceeding, it is critical that you take precautions to operating mode of the QCL driver. prevent electrostatic discharge (ESD) damage to the driver and your laser. - Page 9 QCL OEM SERIES LOW-NOISE DRIVER Figure 4 indicates a 150 kΩ resistor connecting the WIRE THE POWER SUPPLIES power supplies to ground; this resistor is necessary if the Wire the QCL driver to the dual power supplies as shown in electronics ground is tied to earth ground at some point Figure 4.
- Page 10 QCL OEM SERIES LOW-NOISE DRIVER • Connect the voltmeter to the Current Limit Monitor, Once the driver is configured, disable the output then switch pins J1:4 (positive) and J1:3 (negative/gnd). off the driver. Finally, switch off the power supplies. • Adjust the LIMIT trimpot until the Current Limit Monitor...
- Page 11 QCL OEM SERIES LOW-NOISE DRIVER Table 4. Local vs. Remote Switch Settings CONFIGURE LOCAL VS. REMOTE CONTROL SWITCH ON (LEFT) OFF (RIGHT) The factory default configuration is with onboard Power and Remote Signal Tied Remote Signal Enable switches active, and the remote signals are inactive.
- Page 12 QCL OEM SERIES LOW-NOISE DRIVER CONNECT THE QUANTUM CASCADE LASER RECOVER FROM AN INTERNAL OVER-TEMPERATURE FAULT Once you are comfortable with operating the QCL driver, disable the output, switch off all power to the driver, The QCL driver is equipped with a protection circuit to switch disconnect the test load, and connect the laser.
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Page 13: Troubleshooting
Refer to page 12. Noise current is higher than There may be ground loops Refer to Wavelength Electronics Application Note AN-LD08: “Manage expected in the system; some system Grounding to Minimize Noise with the QCL Drivers”: components may be higher https://www.teamwavelength.com/download/applicationtechnotes/an-ld08.pdf... -
Page 14: Technical Support Information
QCL OEM SERIES LOW-NOISE DRIVER TECHNICAL SUPPORT QCL OEM REV A – C TRANSFER FUNCTIONS INFORMATION The transfer functions for production revisions A – C are shown in Table 5 and Table 6. This section includes useful technical information on these Table 5. - Page 15 QCL OEM SERIES LOW-NOISE DRIVER REPLACE THE INTERNAL FUSES SOFT-CLAMP CURRENT LIMIT The QCL driver is equipped with two internal fuses. If the The QCL driver employs a soft-clamping current limit that QCL driver will not power on and you have verified that the...
- Page 16 QCL OEM SERIES LOW-NOISE DRIVER SQUARE WAVE RESPONSE PRODUCT VARIATIONS Figure 10 and Figure 11 illustrate the modulation response We design and manufacture our products in-house, and of the QCL1000 driven at 1.15 A into a 10 Ω test load.
- Page 17 The QCL driver is designed to deliver extremely low noise drive current to the quantum cascade laser, but other factors must also be considered for optimum system performance. Wavelength Electronics provides a number of resources on our website that will help you understand noise sources and 60 Hz Noise how to eliminate them.
- Page 18 Operating the QCL Driver outside of the SOA voids the warranty. Refer to the Wavelength Electronics website for the most up-to-date SOA calculator for our products. The online tool Airflow Required is fast and easy to use, and also takes into consideration operating temperature.
- Page 19 QCL OEM SERIES LOW-NOISE DRIVER CABLE SPECIFICATIONS WCB31 1 — 14-PIN I/O CABLE; ONE INCLUDED WITH QCL OEM DRIVER Optional connections for Analog In Setpoint Analog In GND POSITION 1 OPEN Analog In POSITION 2 OPEN Monitor Ground LIM_MON OUT_MON...
- Page 20 QCL OEM SERIES LOW-NOISE DRIVER WCB313 — 3-PIN QCL POWER CABLE; ONE INCLUDED WITH QCL OEM DRIVER PGND V– Overall Cable Length 18” STRIP 5.00" OF 3-pin MOLEX PVC JACKET SDA-43645-0300 TYP, THIS END WCB314 — 4-PIN QCL LOAD CABLE; ONE INCLUDED WITH QCL OEM DRIVER...
- Page 21 QCL OEM SERIES LOW-NOISE DRIVER MECHANICAL SPECIFICATIONS - PWRPAK-24V POWER SUPPLY (10.1) VOLTAGE ADJUSTMENT SEE NOTE C 5-M3.5 AC(L) AC(N) (14) (10) 62±0.5 19MAX 80±1 31.5±1 NAME PLATE SEE NOTE A SEE NOTE B HWS15 - 5 /A INPUT : 100-240VAC 0.5 A...
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Page 22: Mechanical Specifications
QCL OEM SERIES LOW-NOISE DRIVER MECHANICAL SPECIFICATIONS 6.274 5.00 166.370 6.55 152.400 6.00 140.818 5.54 55.378 2.18 35.738 1.41 14.996 15.011 18.250 3.569 R.14 18.974 101.600 58.712 4.00 2.31 58.712 2.31 139.700 5.50 Figure 21. QCL OEM Driver Mechanical Dimensions The QCL OEM Driver must be firmly secured by the baseplate mounting tabs, and not supported by the cable connectors. -
Page 23: Certification And Warranty
There are two fuses within the chassis that are user-serviceable. CERTIFICATION There are no other user-serviceable parts inside this product. Return the product to Wavelength Electronics for service and Wavelength Electronics, Inc. (Wavelength) certifies that this repair to ensure that safety features are maintained.