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Novel High-Power, High Repetition Rate Laser Diode Pump Modules Suitable for High-Energy Class Laser Facilities
- Source :
- Instruments, Volume 3, Issue 3, Instruments, Vol 3, Iss 3, p 34 (2019)
- Publication Year :
- 2019
- Publisher :
- MDPI AG, 2019.
-
Abstract
- The latest generation of high-energy-class pulsed laser facilities, under construction or planned, such as EuPRAXIA, require reliable pump sources with high power (many kW), brightness (&gt<br />1 MW/cm2/sr) and electro-optical conversion efficiency (&gt<br />50%). These new facilities will be operated at high repetition rates (around 100 Hz) and only diode lasers are capable of delivering the necessary performance. Commercial (quasi-continuous wave, QCW) diode laser pulse-pump sources are, however, constructed as low-cost passively cooled stacked arrays that are limited either in brightness, efficiency or repetition rate. Commercial continuous wave diode laser pumps constructed using microchannel coolers (as used in high-value industrial machine tools) can fulfil all requirements, but are typically not preferred, due to their cost and complexity and the challenges of preventing cooler degradation. A custom solution is shown here to fill this gap, using advanced diode lasers in a novel passive side-cooling geometry to realize 100 &hellip<br />200 Hz pump modules (10%&ndash<br />20% duty cycle) that emit peak power of 6 kW at wavelength = 940 nm. The latest performance of these modules is summarized and compared to literature. We show that a brightness &gt<br />1 MW/cm2/sr can be efficiently delivered across a wide range of laser pulse conditions with 10% duty cycle (pulse width: 100 &micro<br />s &hellip<br />100 ms &hellip<br />cw, repetition rate up to 1 kHz). Furthermore, we describe how these pumps have been used to construct and reliably operate (&gt<br />109 pulses without degradation) in high-energy-class regenerative and ring amplifiers at the Max-Born-Institut f&uuml<br />r Nichtlineare Optik und Kurzzeitspektroskopie (MBI). We also show first results on 100 Hz pumping of cryogenically cooled solid-state Yb:YAG slab amplifiers, as anticipated for use in the EuPRAXIA laser, and note that peak temperature is disproportionately increased, indicating that improved cooling and more detailed studies are needed.
- Subjects :
- Materials science
fibre coupled
02 engineering and technology
01 natural sciences
law.invention
diode laser
010309 optics
020210 optoelectronics & photonics
law
0103 physical sciences
0202 electrical engineering, electronic engineering, information engineering
lcsh:Nuclear and particle physics. Atomic energy. Radioactivity
Instrumentation
100 Hz pumping
Diode
Laser diode
business.industry
Amplifier
Energy conversion efficiency
diode stacks
EuPRAXIA
Laser
high duty cycle
lcsh:QC1-999
Duty cycle
lcsh:QC770-798
Optoelectronics
Continuous wave
business
lcsh:Physics
Pulse-width modulation
Subjects
Details
- ISSN :
- 2410390X
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- Instruments
- Accession number :
- edsair.doi.dedup.....84e011a138ad1a132b0effe2a8551eaa