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 to diodes – up to 350 A, 140 V, 300 us, 30 Hz (but 50 W max)
Pulse width – 50-300 us
Repetition rate – up to 30 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)

Output Pulse Example

An output pulse for SDC-150-160V (pre-set pulse width 200 us, 100 A, rise time 7.35 us, fall time 8.05 us)

Input:

Voltage, V_IN

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)

model dependent (user selectable up to 160 V), other on request

Maximum output voltage

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

Maximum output current (I_max or I₂₅₀)

model dependent (user selectable up to 350 A), other on request
I_max is fully achievable at pulse widths up to 250 us, and is derated at longer pulses

Maximum peak power (I_max*V_max)

model dependent (usually in the 20-25 kW range)

Output current (I)

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

Buffer voltage

adjustable in V_IN – 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 ramp adjustable in 0-50 us range

Repetition rate (f)

up to 30 Hz adjustable, other on request

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

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

V_IN-4V (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
• door interlock connection
• input frequency is too high

Interfaces (digital)

RS-232 interface (RS-485 on request)

Synchronizations

• synchro inputs (2 pcs)
• synchro output (1 pc)

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)

180x70x(30-35) mm, model dependent

Weight

< 0.5 kg

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

YYYY codes the voltage version of the driver (nominal value, can be 63 V, 80 V, 100 V, 126 V, 160 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 ⁽¹⁾
	SDC-150-63V	SDC-150-80V	SDC-150-100V	SDC-150-126V	SDC-150-160V
Embedded capacitor bank:
Voltage (V_max), V	63	80	100	126	160
Capacitance, mF	13	6.1	3.9	3.3	1.5
Capacitor charging power supply:
Output voltage (buffer voltage), V (V_MIN=V_IN+5V)	V_MIN…63	V_MIN…80	V_MIN…100	V_MIN…126	V_MIN…160
Maximum power in dependence on buffer voltage, W ⁽²⁾ (V_MIN=V_IN+5V)	> 50 @ V_MIN…63V	> 50 @ V_MIN…80V	> 50 @ V_MIN…100V	> 50 @ V_MIN…126V	> 50 @ V_MIN…160V
Diode driver:
Maximum output current, A: – @ 250 us (I₂₅₀) – @ 300 us (I₃₀₀)	350 300	250 200	200 150	200 150	150 100
Minimum output current, A	10	10	10	10	5
Recommended diode voltage, V ⁽³⁾: – @ I₃₀₀, 300 us – @ ½I₂₅₀, 250 us	< 48 < 53	< 62 < 69	< 80 < 87	< 104 < 110	< 132 < 143
Maximum pulse width (T_max), us	300
Minimum pulse width, us	50
Maximum repetition rate, Hz ⁽⁴⁾	30
Output limitations:
Pulse energy limit, J ⁽⁴⁾ I₃₀₀V_maxT_max	~5.6	~4.8	~4.5	~4.5	~5.2
Power limit, W	50
Guaranteed regime	300A-48V- 250us-10Hz or 150A-53V- 250us-20Hz	200A-62V- 300us-10Hz or 100A-69V- 250us-20Hz	150A-80V- 300us-10Hz or 100A-87V- 250us-20Hz	150A-104V- 250us-10Hz or 100A-106V- 250us-20Hz	100A-230V- 250us-5Hz or 100A-150V- 250us-10Hz or 100A-80V- 250us-20Hz
TEC	+	+	+	+	+
Pockels cell driver	QBD-nano-3801
Height (H), mm	< 36	< 31	< 31	< 36	< 31

⁽¹⁾ 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 contact the manufacturer for the details.

⁽²⁾ Models listed above deliver full output power in a wide range of the output voltages.

⁽³⁾ Please note that the output voltage applied to the diodes is always 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.

⁽⁴⁾ If the diode voltage is close to V_max and the operating current is close to I_max, the typical pulse energy is ~5 J, and 30 Hz operation is not possible due to the 50 W average power limitation. Therefore, 50 Hz operation is only possible when the operating current and/or voltage are several times lower than I_max and V_max, respectively.

Examples:

– SDC-150-100V – fully standard 100 V version with all the parameters as given above
– SDC-150-630V-RS485 – standard 63 V version, but with RS-485 machine interface

SDC-150 diode controller

Applications

Features

Output Pulse Example

Input:

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

Output 2 (TEC):

Output 3 (Pockels cell driver):

Miscellaneous:

Environment:

Other:

Examples:

Resources