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Features & Applications

FEATURES

High energy nanosecond lasers
Temporally shaped pulses
Up to 10 J pulse energies
10 Hz pulse repetition rate
Arbitrary waveform generator for pulse shaping
0.15 – 500 ns adjustable pulse duration
Excellent pulse energy stability
Cost effective flash lamp pumped power amplifier
Optional temperature stabilized harmonics options
Super-Gaussian beam profile

APPLICATIONS

OPCPA pumping
Front end for power amplifiers
Ti:Sapphire pumping
Laser peening – material hardening by laser-induced shock wave
Plasma and shock physics

Description

The main laser feature is the ability to shape output pulses temporally which is accomplished by an electro-optical modulator driven by programmable arbitrary waveform generator (AWG).

The front end of ANL AWG laser system is comprised of a single-mode CW laser which is amplified in a fiber amplifier in the next step. Later on, AWG driven modulator transmits pulses of required temporal shape and duration which are further amplified diode pumped regenerative amplifier or all-in-fiber amplifier in order to reach energies sufficient to amplify in single-pass diode and flash lamp pumped amplifiers. Pulse shaping resolution is 125 ps, while maximum pulse length is 500 ns.

ANL series linear amplifiers are convenient solution for high energy nanosecond systems where pulses are amplified in a chain of flash lamp pumped amplification units up to required energy. During amplification spatial beam shaping is used in order to get a flat top shaped beam profile without hot spots at the system output.

Angle-tuned non-linear crystals harmonic generators mounted in temperature stabilized heaters are used for second, third and fourth harmonic generation. Harmonic separation system is designed to ensure high spectral purity of radiation and direct it to the output ports.

Specifications

Model	ANL2k10-AWG	ANL5k10-AWG	ANL10k10-AWG
MAIN SPECIFICATIONS ¹⁾
Output energy ²⁾
at 1064 nm	1 500 mJ	5 000 mJ	10 000 mJ (2 × 5 000 mJ) ³⁾
at 532 nm ^{4) 5)}	1 000 mJ	3 000 mJ	6 000 mJ
at 355 nm ⁴⁾	Inquire
Pulse repetition rate	10 Hz
Pulse duration ⁶⁾	0.15 – 20 ns
Pulse energy stability ⁷⁾
at 1064 nm	≤ 0.5 %
at 532 nm	≤ 1 %
Long-term power drift ⁸⁾	± 2 %
Beam spatial profile ⁹⁾	Super-Gaussian
Beam diameter ¹⁰⁾	~11 mm	~25 mm
Beam pointing stability ¹¹⁾	≤ 50 µrad
Beam divergence	≤ 0.5 mrad
Optical pulse jitter ¹²⁾	≤ 30 ps
Linewidth	≤ 1 cm^-1
Polarization	linear, > 90 %		linear
PHYSICAL CHARACTERISTICS ¹³⁾
Laser head size (W×L×H mm)	750 × 1350 × 300	700 × 2100 × 300	1000 × 2100 × 300
Power supply size (W×L×H mm)	550 × 600 × 840 – 1 unit 550 × 600 × 670 – 1 unit	550 × 600 × 1220 - 2 units	550 × 600 × 1220 – 2 units 550 × 600 × 670 – 1 unit
Umbilical length ¹⁴⁾	5 m
OPERATING REQUIREMENTS ¹⁵⁾
Power requirements ¹⁶⁾	208, 380 or 400 V AC, three phases, 50/60 Hz
Power consumption ¹⁷⁾	≤ 6 kVA	≤ 9 kVA	≤ 13 kVA
Water supply ¹⁷⁾	≤ 5 l/min, 2 Bar, max 15 °C	≤ 8 l/min, 2 Bar, max 15 °C	≤ 12 l/min, 2 Bar, max 15 °C
Operating ambient temperature	22 ± 2 °C
Storage ambient temperature	15 – 35 °C
Relative humidity (non-condensing)	≤ 80 %
Cleanness of the room	ISO Class 7

Due to continuous improvement, all specifications are subject to change without notice. The parameters marked ‘typical’ are indications of typical performance and will vary with each unit we manufacture. Presented parameters can be customized to meet customer‘s requirements. All parameters measured at 1064 nm if not stated otherwise.
The output energies are measured at 5 ns, rectangular pulse at time domain, FWHM.
The 10 J energy output is combined of two 5 J channels with vertical and horizontal polarizations.
Harmonic outputs are optional. Specifications valid with respective harmonic module purchased. Outputs are not simultaneous.
Second harmonic is available with LBO crystal then the conversion efficiency is increased to 70%. If TH/FH options are orders second harmonic efficiency is reduced to ~50 %.
Variable pulse duration in steps of 125 ps. Standard pulse duration adjustability is between 1-20 ns. Shorter or longer pulse durations are optional. Pulse shaping is possible in the range of 1 – 500 ns.
Under stable environmental conditions, normalized to average pulse energy (RMS, averaged from 60 s).
Measured over 8 hours period after 30 min warm-up when ambient temperature variation is less than ±2 °C.
Super-Gaussian spatial mode of 6-11th order in near field.
Beam diameter is measured at signal output at 1/e² level for Gaussian beams and FWHM level for Super-Gaussian beams.
Beam pointing stability is evaluated as movement of the beam centroid in the focal plane of a focusing element (RMS, averaged from 60 s).
Optical pulse jitter with respect to electrical outputs: Trig out > 3.5 V @ 50 Ω.
System sizes are preliminary and depend on customer lab layout and additional options purchased.
Longer umbilical with up to 10 m available upon request.
The laser and auxiliary units must be settled in such a place void of dust and aerosols. It is advisable to operate the laser in air conditioned room, provided that the laser is placed at a distance from air conditioning outlets. The laser should be positioned on a solid worktable. Access from one side should be ensured.
Voltage fluctuations allowed are +10 % / -15 % from nominal value.
Power consumption and water supply requirements deviate depending on system configuration.

Note: Laser must be connected to the mains electricity all the time. If there will be no mains electricity for longer that 1 hour then laser (system) needs warm up for a few hours before switching on.

Options

Option	Description	Comment
- G	Provides a Gaussian-like beam profile	Pulse energies are typically lower in comparison to standard version by 80%
- AW	Water-air cooling unit or chiller
- N20…N500	Extended AWG pulse durations	Output energies (especially for SHG output) are specified for one pulse duration with square temporal pulse shape

Performance

Principal optical layout of ANL10k10-AWG-SH (actual layout might vary)	Temporally square shaped pulse (yelow line)	Temporally M shaped pulse (yelow line)
Typical beam profile of ANL AWG laser system at 532 nm (imaged from SH crystal plane)

Drawings

ANL10k10-AWG laser head outline drawing (actual dimensions might vary)

Typical power supply rack dimensions (MR rack used depends on the laser model)

Power Supply

Cabinet	Usable height	Height H, mm	Width W, mm	Depth D, mm
MR-9	9 U	455.5 (519 ¹⁾ )	553	600
MR-12	12 U	589 (653 ¹⁾ )	553	600
MR-16	16 U	768 (832 ¹⁾ )	553	600
MR-20	20 U	889 (952 ¹⁾ )	553	600
MR-25	25 U	1167 (1231 ¹⁾ )	553	600
MR-34	34 U	1640 (1709 ¹⁾ )	553	600

1.Full height with wheels.

Publications

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Spectral pulse shaping of a 5 Hz, multi-joule, broadband optical parametric chirped pulse amplification frontend for a 10 PW laser system

Related applications: High Intensity Sources OPCPA Systems

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