Laser Power Supplies Division

Pulse Power Supply for High Power Laser

a) High Peak current pulsed power supply for solid state lasers

b) High voltage and high speed trigger circuits

c) Pulse power supply for copper vapour lasers (CVLs)

   (i) Copper vapour lasers

   (ii) Power supply for copper vapour lasers (CVLs)


a) High Peak current pulsed power supply for solid state lasers


High peak current pulsed power Supply for solid state laser
High peak current pulsed power Supply for solid state laser


The pulsed power supplies for solid state lasers consists of resonant charging circuits for large capacitor banks, Pulse forming networks (PFN), high voltage trigger circuits, interlocks and monitoring circuits. A large scale system is developed for high power high energy (400 J) 2-beam Nd: Glass laser. The stored electrical energy is of the order of (1.5 MJ) capacity. The stored energy is coupled to around 300 flash lamps of different sizes in controlled manner.
High Peak current pulsed power supply for solid state lasers


Constant current power supplies (CCPS) are developed using 50Hz resonant charging and 25 kHz resonant immittance converter topologies for capacitor banks charging. Bipolar power supplies for capacitor bank charging is design and developed for flash lamp pumped solid state lasers. High accuracy (0.1%) charging power supply is designed and developed for regenerative amplifier in OPCPA project.

Specifications of 2-beam high power laser power supply:

S. No. Parameters values
1. Input 400 V, 3-phase, 50Hz
2. Charging voltage (Max.) 5kV
3. Total installed capacity 1.5MJ
4. Peak discharge current per flash 6kA
5. Charging time (Max.) 40s
6. Pulse duration 500us
7. Peak power per flash 2.5kJ at 500us
8. Repetition rate Single shot
9. Cooling mechanism Air cooled
10. Operation mode Unipolar/bipolar

Specifications of power supplies for faraday isolator:

S. No. Parameters values
1. Charging voltage (Max.) 5kV
2. Installed capacity 16kJ
3. Pulse width 3ms
4. Coil inductance 2.5mH
5. Peak magnetic field 1.5T


a) High Peak current pulsed power supply for solid state lasers


b) High voltage and high speed trigger circuits:

High Voltage & High Speed Trigger Circuits
High Voltage & High Speed Trigger Circuits


High power and high energy lasers, their subsystems, laser plasma interaction experimental setups and Electro-optical devices need high voltage and fast rise time trigger signals. The division has expertise in development of trigger switches based on a variety of switches such as Ignitron, Thyratron, Avalanche transistors and SCRs for these applications.

C) Pulse power supply for Copper vapour laser


(i) Development of copper vapour lasers:

Copper Vapour Laser Electronics Laboratory works on design, development and maintenance of copper laser systems. Copper Vapour Laser, Copper Bromide Lasers and Copper HyBrID lasers with average power from 4 W to 100 W from single unit are developed. The lasers operate with pulse repetition rate of 5 to 20 kHz and typical pulse width of 40 ns. The laser wavelength of these units are 510 nm (green) and 578 nm (yellow). These lasers are used in various application like second harmonic generation for Fibre Bragg Grating (FBG) inscription, pumping dye lasers etc.

Elemental copper vapour lasers are typically operated at 6 kHz with wall plug efficiency of about 1% whereas Copper Bromide and Copper HyBrID lasers operate at high repetition rate of 18 KHz with wall plug efficiency of 2 %. The development of laser systems require multidisciplinary expertise in the field of high vacuum, high temperature, thermal insulation, high voltage, precise gas flow, precise electronic control and instrumentation and EMC/ EMI.

1. Elemental Copper Vapour Laser (40 W) 2. Copper Bromide Laser (40 W) 3. Copper HyBrID Laser (100 W)
1. Elemental Copper Vapour Laser (40 W) 2. Copper Bromide Laser (40 W) 3. Copper HyBrID Laser (100 W)


(ii) Development of pulsed power supply for copper vapour lasers:

The conventional design of the power supply for CVL is based on hydrogen thyratron as a high voltage, high power and high repetition rate switch in the pulse generator circuit. The power supply team has also developed systems based on insulated gate bipolar transistor (IGBT) and magnetic pulse compressors (MPC). Power supply units are designed and developed for copper lasers and its variant delivering average electrical input power range of 2 kW to 10 kW. 

Some power supply units incorporate advanced microcontroller units for monitoring and control of various parameters for the laser operation. The solid-state pulse power supplies are upgraded with reliable and user-friendly PLC based control unit. Synchronization of solid-state pulse power is achieved to operate the lasers in Master Oscillator Power Amplifier (MOPA) configuration. Some of the units / cards developed in the lab are:

  • Timer Control Unit
  • Gas and Vacuum Control Unit
  • Pressure and Temperature Monitoring Card
  • Dual IGBT driver Card for 1200V, 400A device
  • Precise delay generator Unit, 0 to 255 ns with resolution of 1 ns
  • Programmable Logic Controller Unit for monitoring and control of Laser and DC power supply


Specifications of IGBT based solid state pulse power supply for 40 W Copper Vapour Laser
  • Input: Three phase, 415 VAC mains, 50 Hz
  • Output peak voltage: 25 kV
  • Peak current: 900 A
  • Pulse repetition rate: 6.5 kHz
  • Rise time: 80 ns
  • Average dumped power: 5 kW
  • Pulse generator topology: IGBT based capacitor to capacitor charge transfer circuit with MPC
  • Cabinet size: 19” / 36U rack, 800mm depth
  • Cooling: Water cooled

Laser Power Supplies Division

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