Narrow line diode laser stacks for DPAL pumping

Koenning, Tobias; Irwin, David; Stapleton, Dean; Pandey, Rajiv; Guiney, Tina; Patterson, Steve

doi:10.1117/12.2044723

Cited by 9 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, efficient pumping is possible only in case the emission spectrum of the diode laser is narrower than the absorption spectrum of the laser medium. An example is pumping of alkali metal vapor lasers requiring δλ < 0.2 nm [26]. However, even in case of laser media such as Yb:LuAG or Yb:YAG with a comparable broad absorption band [27], wavelength stabilization can be beneficial, especially in case of short or ultra-short pulsed laser systems with highest output power.…”

Section: Pumping Of Solid State Lasersmentioning

confidence: 99%

Wavelength stabilization and feedback sensitivity of multi-kW diode laser stacks

Witte,

Dommermuth,

Weber

et al. 2024

High-Power Diode Laser Technology XXII

View full text Add to dashboard Cite

In the first part of this paper, we report on a fiber-coupled wavelength-stabilized high power diode laser system with an optical output power of more than 4 kW at a wavelength of 969 nm. The spectrum is locked over the entire working range with a FWHM of less than 0.5 nm. More than 90% power is encircled within 0.7 nm. The radiation is coupled into a fiber with a core diameter of 1000 µm. Additionally, we show the way for further power scaling up to 8 kW by using diode laser bars that enable higher injection current and output power. In the second part of this paper, we report on the impact of external back-reflections on the diode laser either by long term operation with VBGs or by short term operation in an experimental set-up based on a partially reflective mirror. For our standard set-up with VBG, we do not observe any feedback induced failures or degradation for operating times up to 3,000 hours. However, as expected, we do observe failures with increased feedback. In accordance with the literature, misalignment towards the p-clad can be very critical at wavelengths greater than 960 nm. The feedback-induced failure-rate increases exponentially with the injection current which make high power diode laser bars with high filling factors a very robust solution for external wavelength stabilization.

show abstract

Section: Pumping Of Solid State Lasersmentioning

confidence: 99%

Wavelength stabilization and feedback sensitivity of multi-kW diode laser stacks

Witte,

Dommermuth,

Weber

et al. 2024

High-Power Diode Laser Technology XXII

View full text Add to dashboard Cite

show abstract

“…Large-scale diode pump arrays are based on stacked arrays of 1-cm diode laser bars, mounted either as a series of closespaced bars on a single water cooler located on the rear edge of the stack (forming a quasi-continuous-wave, QCW-stack), or as a stacked array of microchannel coolers, as shown in Fig 6 . Microchannel coolers (one water cooler per bar) provide the highest overall performance, with around Popt = 400…500 W continuous wave (CW) power per bar for use in highspecification industrial laser processing tools [25]. Such configurations have high purchase costs, so are not preferred for very large systems, not least as microchannel coolers require very specialized handling to ensure long lifetime, although they do find use in specialist high-value applications such as pumping of alkali-lasers [26]. In contrast, although the bars in water-cooled QCW stacked arrays can operate with Popt = 400…600 W, the cooling configuration (one water cooler for many 10's of bars) is typically only suitable for use in low-duty cycle operation of around 1%, limiting the achievable repetition rate of the coolers to f = 20 Hz or less.…”

Section: Examples Of Current State Of Technologymentioning

confidence: 99%

Diode pumps for future laser plasma accelerators: perspectives from research and industry

Crump,

Gizzi

2024

High-Power Diode Laser Technology XXII

View full text Add to dashboard Cite

Diode laser pumps are a critical technology for advanced accelerators based on laser plasma accelerators, and essential system components when higher repetition rate operation is needed. They are also a significant cost element in larger systems. An overview of progress in research and industry is presented, summarizing status of the technology, focusing on efforts to economically scale peak and average power and to enable new options in plasma acceleration, for example the use of thulium-doped gain media with its pumping wavelength at 780 nm. Development needs to support the accelerator community will be collected, covering topics such as efforts to lower cost in €/W by raising the diode laser output power, to increase repetition rates to 100 Hz and even up to 1 kHz, to scale TRL of emerging diode laser technologies, and to ensure low-failure-rate operation of large systems.

show abstract

“…For example, they play an important role in pumping Rb atoms in a Rb fountain atomic clock. [1][2][3][4] Additionally, it is vital for laser cooling and imprisoning atoms, [5] atomic interferometry, [6] as well as establishing new quantum frequency standards. [7] Phase-related noise characteristics are essential aspects of laser performance, especially the linewidth parameter.…”

Section: Introductionmentioning

confidence: 99%

Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock*

Zhang¹,

Yang²,

Feng³

et al. 2019

Chinese Phys. B

View full text Add to dashboard Cite

We propose a method to directly measure phase-related noise characteristics of single-frequency lasers in the 728–980 nm band based on a 120° phase difference interferometer. Differential phase information of the laser under test is demodulated via the interferometer. Other parameters related to the phase noise characteristics such as linewidth at different observation time, phase/frequency noise, power spectrum density of phase/frequency fluctuation, and Allan deviation are further obtained. Frequency noise as low as 1 Hz2/Hz can be measured using our system. Then the phase-related noise characteristics of two commercial lasers frequently used in cold atomic clocks are studied systematically by the method. Furthermore, several influencing factors and their relative evolution laws are also revealed, such as the pump current and frequency-locking control parameters. This would help to optimize the laser performance, select laser sources, and evaluate the system performance for cold atomic physics applications.

show abstract

Narrow line diode laser stacks for DPAL pumping

Cited by 9 publications

References 2 publications

Wavelength stabilization and feedback sensitivity of multi-kW diode laser stacks

Wavelength stabilization and feedback sensitivity of multi-kW diode laser stacks

Diode pumps for future laser plasma accelerators: perspectives from research and industry

Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock*

Contact Info

Product

Resources

About