Products

SDC-BT diode driver

Applications

Power supply for pump diodes of DPSS lasers such as Nd:YAG

Features

Input – 110-240 V AC
Output (for different models) – up to 300 A, up to 450 V, up to 100 W
Pulse width – 50-300 us
Repetition rate – up to 50/100 Hz
Rise time – < 20-30 us typically
1x high-power TEC + 1x low-power TEC inside
Possibility to control an extra external Pockels cell driver

Download manual (1.9 MB)

SDC-BT pulsed laser diode driver is a family of drivers specifically designed to power medium-power diode-pumped solid-state (DPSS) lasers, such as Nd:YAG. Our module provides pulsed current with pulse widths of 50-300 µs to drive pump diodes, delivering up to 100 W of average power. Pulse repetition rates of up to 50/100 Hz (high-voltage/low-voltage models) are supported.

The module can be synchronized in two ways:

Internally: Pulses are generated according to an internal clock.
Externally: Pulses with a user-defined width are triggered by an external synchronization signal.

It is also capable of powering and controlling a Pockels cell driver for the generation of Q-switched pulses. The SDC-BT is able to send output synchronization signals to other equipment.

Multiple outputs and other customizations are available on request.

The module features a universal 110-240 V AC wide-range input.

All the important parameters for SDC-BT laser diode driver (such as output current, buffer voltage, pulse width, pulse repetition rate and others) can be configured via the front panel user interface (5” color touchscreen display) or can be controlled from a computer via the USB or via the RS-485 interface. The default interface is the RS-485 (the RS-232 is available upon request).

Driver Architecture:

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

110-240 VAC, 50/60 Hz, 1 ph

Current consumption

< 5 A @ 110 V AC

Output:

Regime of operation

pulsed

Maximum buffer voltage (V_max)

model dependent (user selectable up to 450 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 400 A), other on request
I_max is fully achievable at pulse widths up to 250 us, and is derated at longer pulses

Output current

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

Buffer voltage

adjustable in 10 V – V_max range, other on request

Pulse width

adjustable in 50 us – T_max range, T_max is 300 us by default, other on request

Rise time

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

Pulse repetition rate

up to 50/100 Hz adjustable, other on request

Maximum average output power

100 W, model dependent, other on request

Peak power

model dependent (usually in the 20-50 kW range), other on request

Bias current

+, model dependent (~50-100 mA)

TEC 1:

Current

up to 10 A

Voltage

up to 20 V

Power

200 W max.

Feedback loop

10 kOhm NTC

Temperature

+10 … +40 °C by default, other on request

TEC 2:

Current

up to 5 A

Voltage

up to 20 V

Power

50 W max.

Feedback loop

10 kOhm NTC

Temperature

+10 … +40 °C by default, other on request

Miscellaneous:

Protections

• from overheating
• from incorrect buffer voltage
• TEC1 out of range
• TEC2 out of range
• too high input frequency
• door-interlock connection

Cooling

forced-air cooling with built-in fans

Interfaces

• UI – 5” display with touchscreen
• USB
• RS-485 (RS-232 on request) interface

Synchronizations

• 1 pc synchro input
• 1 pc synchro output

Pockels cell driver control

yes, the Pockels cell driver needs to be purchased separately, placed outside and connected with a cable

Environment:

Operating temperature

+10 … +40 °C

Storage temperature

-20 … +60 °C

Humidity

0 … 90%, non-condensing

Other:

Size (LxWxH)

260x195x107 mm

Weight

< 3.0 kg

SDC-BT-XXXX-[YYYY]-[VVVVV], where:

XXXX code denotes the voltage version of the driver (nominal value, can be 63 V, 80 V, 100 V, 126 V, 160 V, 200 V, 250 V, 400 V, 450 V, or custom). The maximum output current, internal capacitor bank capacitance, average output power, and number of TECs are fixed for each voltage version, see details in the table below.
YYYY defines low‑current and high‑current versions of the driver. The low‑current versions are optimized for low‑current diodes and for operating regimes with low energy but high repetition rates. It is reasonable to choose a low‑current version, which provides improved output‑current quality in the low‑current region, if the maximum operating current in your system is at least three times lower than the I_max of the standard model. If not specified, the standard version is supplied.
VVVVV code denotes the type of communication interface, it can be either RS232 or RS485. By default, the RS485 version is supplied.

LOW-VOLTAGE VERSIONS

PARAMETER	VALUE ⁽¹⁾
	SDC-BT-63V	SDC-BT-80V	SDC-BT-100V	SDC-BT-126V
Embedded capacitor bank:
Voltage (V_max), V	63	80	100	126
Capacitance, mF	10.8	10.8	6.0	3.6
Capacitor charging power supply:
Buffer voltage, V	10…63	10…80	10…100	10…126
Maximum power in dependence on buffer voltage, W ⁽²⁾	> 100 @ 30V…63V	> 100 @ 30V…80V	> 100 @ 30V…100V	> 100 @ 30V…126V
Diode driver:
Maximum output current, A: – @ 250 us (I₂₅₀) – @ 300 us (I₃₀₀)	350 300	350 300	300 250	250 200
Minimum output current, A	10
Recommended diode voltage, V ⁽³⁾: – @ I₃₀₀, 300 us – @ ½I₂₅₀, 250 us	< 47 < 50	< 63 < 69	< 79 < 87	< 96 < 107
Maximum pulse width (T_max), us	300
Minimum pulse width, us	50
Maximum repetition rate, Hz ⁽⁴⁾	100
Output limitations:
Pulse energy limit, J I₃₀₀V_maxT_max	~5.6	~7.2	~7.5	~7.5
Power limit, W	100
Guaranteed regime	300A-46V- 300us-15Hz or 100A-25V- 250us-100Hz	300A-63V- 300us-10Hz or 100A-25V- 250us-100Hz	250A-79V- 300us-10Hz or 100A-25V- 250us-100Hz	200A-96V- 300us-10Hz or 100A-25V- 250us-100Hz
TEC 1	+	+	+	+
TEC 2	+	+	+	+
Low-current versions	SDC-BT-63V-100A	SDC-BT-80V-100A	on request	on request
I₂₅₀ / I₃₀₀, A	100 / 100	100 / 100	–	–
I_min, A	5	5	–	–
High-current versions	SDC-BT-63V-400A	SDC-BT-80V-400A	on request	on request
Capacitance, mF	14.4	14.4	–	–
I₂₅₀ / I₃₀₀, A	400 / 350	400 / 350	–	–
I_min, A	10	10	–	–
Recommended diode voltage, V ⁽³⁾: – @ I₃₀₀, 300 us – @ ½I₂₅₀, 250 us	< 46 < 52	< 63 < 69	–	–
Guaranteed regime	400A-44V- 250us-10Hz or 350A-44V- 300us-10Hz	400A-44V- 250us-10Hz or 350A-44V- 300us-10Hz	–	–

⁽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.

⁽²⁾ In dependence on the topology of the internal DC/DC power converter the dependence of the output power of the capacitor charger from the output voltage is principally different for different models of SDC-BT. Two low-voltage models deliver full output power in a wide range of the output voltages. Unlike them, two high-voltage models are able to deliver full output power close to V_max only. At lower output voltages the output power of high-voltage models drops approx. linearly with decreasing output voltage.

⁽³⁾ 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.

⁽⁴⁾ If the diode voltage is close to V_max and the operating current is close to I_max, the typical pulse energy is ~5–7 J, and 100 Hz operation is not possible due to the 100 W average power limitation. Therefore, 100 Hz operation is only possible when the operating current and/or voltage are several times lower than I_max and V_max, respectively. In such cases, it may be reasonable to consider a low‑current version of the driver.

Examples:

– SDC-BT-63V – fully standard 63 V version with all the parameters as given above
– SDC-BT-63V-100A-RS232 – low-current version of 63 V model with RS-232 communication interface instead of RS-485

HIGH-VOLTAGE VERSIONS

PARAMETER	VALUE ⁽¹⁾
	SDC-BT-160V	SDC-BT-200V	SDC-BT-250V	SDC-BT-400V
Embedded capacitor bank:
Voltage (V_max), V	160	200	250	400
Capacitance, uF	2700	2200	1500	820
Capacitor charging power supply:
Buffer voltage, V	10…160	10…200	10…250	10…400
Maximum power in dependence on buffer voltage, W ⁽²⁾	> 100 @ 160V	> 100 @ 200V	> 100 @ 250V	> 100 @ 400V
Diode driver:
Maximum output current, A: – @ 250 us (I₂₅₀) – @ 300 us (I₃₀₀)	225 200	200 175	175 150	125 100
Minimum output current, A	10	10	10	5
Recommended diode voltage, V ⁽³⁾: – @ I₃₀₀, 300 us – @ ½I₂₅₀, 250 us	< 118 < 137	< 144 < 161	< 196 < 223	< 333 < 357
Maximum pulse width (T_max), us	300
Minimum pulse width, us	50
Maximum repetition rate, Hz ⁽⁴⁾	50
Output limitations:
Pulse energy limit, J I₃₀₀V_maxT_max	~9.6	~10.5	~11.2	~12.0
Power limit, W	100
Guaranteed regime	225A-137V- 250us-10Hz or 110A-140V- 250us-20Hz or 50A-120V- 250us-50Hz	200A-160V- 250us-10Hz or 100A-150V- 250us-20Hz or 50A-110V- 250us-50Hz	150A-195V- 250us-10Hz or 100A-148V- 250us-20Hz or 50A-105V- 250us-50Hz	100A-330V- 250us-10Hz or 50A-360V- 250us-20Hz or 50A-100V- 250us-50Hz
TEC 1	+	+	+	+
TEC 2	N/A
Alternative versions	on request	on request	on request	SDC-BT-450V
Capacitance, uF	–	–	–	780
I₂₅₀ / I₃₀₀, A	–		–	125 / 100
I_min, A	–	–	–	5
Recommended diode voltage, V ⁽³⁾: – @ I₃₀₀, 300 us – @ ½I₂₅₀, 250 us	–	–	–	< 371 < 403
Guaranteed regime	–	–	–	100A-330V- 250us-10Hz or 50A-360V- 250us-20Hz or 50A-120V- 250us-50Hz

⁽⁴⁾ If the diode voltage is close to V_max and the operating current is close to I_max, the typical pulse energy is ~10–15 J, and 50 Hz operation is not possible due to the 100 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. In such cases, it may be reasonable to consider a low‑current version of the driver.

Examples:

– SDC-BT-400V – fully standard 400 V version with all the parameters as given above
– SDC-BT-250V-RS232 – standard 250V version, but with RS-232 communication interface

SDC-BT diode driver

Applications

Features

Driver Architecture:

Input:

Output:

TEC 1:

TEC 2:

Miscellaneous:

Environment:

Other:

SDC-200:

LOW-VOLTAGE VERSIONS

Examples:

HIGH-VOLTAGE VERSIONS

Examples:

Resources