Products

SDC-150 diode controller

Applications

DPSS Nd:YAG pumping + q-switching

Features

The module consists of pulsed current source, TEC controller and Pockels cell driver
Input – 28±7 V DC
Output diode current – up to 250 A, 230 V, 300 us, 20 Hz (but 40-50 W max)
Pulse width – 50-300 us
Repetition rate – up to 20 Hz
Rise time – < 20-30 us
Modifications are possible

Download manual (1.2 MB)

The SDC-150 Nd:YAG controller is a complete solution for powering and controlling a diode-pumped solid-state Nd:YAG laser. Our module includes a pulsed current source to drive pump diodes, TEC controller for their thermal stabilization and embedded Pockels cell driver for generation of Q-switched pulses.

The module requires a 28 V DC (±7 V) power supply.

The SDC-150 can be controlled either digitally via RS-232 interface or manually using jumpers and trimpots (stand-alone mode). The default interface is RS-232 (RS-485 is available as an option). Simple PC software is supplied together with the controller.

The module could be synchronized internally, when pulses are generated according to the internal clock, or externally, when pulses with user fixed width are triggered by an external synchronization signal.

The SDC-150 laser diode controller includes an aluminum heat-dissipation base plate, which by itself is not sufficient to cool the module. The driver is intended to be passively cooled by mounting its bottom surface onto the customer’s external cold plate or heatsink. It is the customer’s responsibility to ensure that the plate temperature remains below 70 °C.

For your convenience for pulsed drivers we offer a calculator for an average output power and a pulse energy (link to open it as a new window)

Input:

Voltage

28±7 V DC

Current consumption

10 A max

Output 1 (diode driver, pulses to pump diodes):

Load

laser diodes (bars and stacks)

Maximum buffer voltage (V_max)

up to 250 V, other on request

Maximum output voltage

model dependent (see also How to order?), other on request

Maximum output current (I_max)

model dependent (user selectable up to 250 A), other on request

Maximum peak power (I_max*V_max)

model dependent (usually in the 10-20 kW range)

Output current (I)

approx. 10-100 % of I_max adjustable, other on request

Buffer voltage

adjustable in V_INPUT – V_max range, other on request

Accuracy

< 1% of I_max

Pulse width (t)

adjustable from 50 us to 300 us (T_max), other on request

Pulse rise time

< 20-30 us typically, slow start adjustable in 0-50 us range

Repetition rate (f)

up to 20 Hz adjustable, other on request

Maximum output power (V*I*t*f)

> 40-50 W model dependent, other on request

Target regime

to be specified for exact version, see also How to order section

Output 2 (TEC):

Load

Peltiers

Maximum output current

5 A (other on request)

Maximum output voltage

20 V (other on request)

Stabilization temperature

+20 … +60 °C adjustable (other on request)

Accuracy

0.1 °C

Thermistor

10 kOhm NTC

Output 3 (Pockels cell driver):

Description

by default, SDC-150 is equipped with QBD-nano-3801 Pockels cell driver. Other drivers can be installed on request.

Load

DKDP Pockels cell

Load capacitance

5-7 pF typically

Pulse shape

triangular (fast rise, relatively slow decay)

Rise time

1-3 ns

Recovery time

5 us typically

Pulse amplitude

2800-3800 V adjustable by default, other on request

Bias voltage

Other

adjustable delay relative to the diode driver

Miscellaneous:

Cooling

passive cooling provided through the driver’s bottom-surface plate attached to the customer’s external cold plate/heatsink. The customer’s responsibility is to keep the plate temperature below 70 °C

Protections

• from incorrect buffer voltage
• TEC is out of range
• from overheating of internal components
• interlock door connection
• input frequency is too high

Interfaces (digital)

RS-232 interface (RS-485 on request)

Interfaces (analogue)

• IDC
• Fault
• Synchro inputs
• Synchro output

Environment:

Operating temperature

0…+40 °C at full output (guaranteed)
-30…+55 °C at 50% of the output power (designed for)

Storage temperature

-40 … +85 °C

Humidity

0 … 90%, non-condensing

Shock / vibration

no special requirements

Other:

Size (LxWxH)

180x70x30 mm

Weight

< 0.5 kg

SDC-150-YYYY-[VVVVV], where:

YYYY codes the voltage version of the driver (nominal value, can be 50 V, 100 V, 250 V, or custom). The maximum output current, internal capacitor bank capacitance, average output power, and other parameters are fixed for each voltage version, see details in the table below.
VVVVV code denotes the type of communication interface, it can be either RS232 or RS485. By default, the RS232 version is supplied.

PARAMETER	VALUE (*)
	SDC-150-50V	SDC-150-100V	SDC-150-250V
Embedded capacitor bank:
Voltage (V_max), V	63	100	250
Capacitance, mF	8.1	4	3
Capacitor charging power supply:
Output voltage (buffer voltage), V	V_IN…63	V_IN…100	V_IN…250
Maximum power in dependence on buffer voltage, W	> 50 @ V_IN…63V	> 50 @ V_IN…100V	> 40 @ V_IN…250V
Diode driver:
Output current (I_min-I_max), A	15…250	10…150	5…100
Recommended diode voltage @ I_max, T_max, V (**)	> V_IN-15 < 50	> V_IN-15 < 85	> V_IN-15 < 230
Pulse width (50-T_max), us	50…300	50…300	50…250
Repetition rate, Hz	0…20	0…20	0…20
Output limitations:
Energy limit	I_maxV_maxT_max
Power limit, W	50	50	40
Guaranteed regime	250A-50V- 300us-10Hz or 250A-20V- 300us-20Hz	150A-85V- 300us-10Hz or 150A-45V- 300us-20Hz	100A-230V- 250us-5Hz or 100A-150V- 250us-10Hz or 100A-80V- 250us-20Hz
TEC	+	+	+
Pockels cell driver	QBD-nano-3801	QBD-nano-3801	QBD-nano-3801

(*) Customizations (e.g. non-standard output currents, non-standard diode voltages and other parameters, software customizations, Pockels cell driver control customizations) are possible on request.

(**) Please note that the output voltage applied to the diodes is several volts lower than the buffer voltage due to voltage drops across internal components and wiring. The higher output current and pulse width are, the lower output voltage is possible with the same buffer voltage. On the contrary, the possible output voltage reaches exactly the buffer voltage at very low currents and pulse widths.

Examples:

– SDC-150-100V – fully standard 100 V version with all the parameters as given above
– SDC-150-50V-RS485 – standard 50 V version, but with RS-485 machine interface

SDC-150 diode controller

Applications

Features

Input:

Output 1 (diode driver, pulses to pump diodes):

Output 2 (TEC):

Output 3 (Pockels cell driver):

Miscellaneous:

Environment:

Other:

Examples:

Resources