Amplitude and frequency stability of a diode-pumped Nd:YAG laser operating at a single-frequency continuous-wave output power of 20 W

Freitag, I.; Golla, D.; Knoke, S.; Schöne, W.; Zellmer, H.; Tünnermann, Andreas; Welling, H.

doi:10.1364/ol.20.000462

Cited by 46 publications

(11 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason for this choice is that the free-running frequency noise of these lasers is 2 to 3 orders of magnitude smaller than for Ar + lasers, and the intensity noise of solid-states-laser is also much lower. Furthermore, solid-state lasers have a very high electrical-to-optical efficiency, which is important especially in space applications like inter-satellite communication or high power applications as laser interferometric gravitational wave detectors.Many of these experiments rely on the high intrinsic stability of Nd:YAG non-planar ring oscillators (NPRO) 2 , the output of which is used in the experiment directly or is amplified either by injection locking [3][4][5] or in a configuration with master oscillator and power amplifier 6 . The free-running frequency noise spectral density of NPROs is of the order of 1 kHz/ √ Hz at 10 Hz and falls like 1/f at higher frequencies.…”

mentioning

confidence: 99%

“…Many of these experiments rely on the high intrinsic stability of Nd:YAG non-planar ring oscillators (NPRO) 2 , the output of which is used in the experiment directly or is amplified either by injection locking [3][4][5] or in a configuration with master oscillator and power amplifier 6 . The free-running frequency noise spectral density of NPROs is of the order of 1 kHz/ √ Hz at 10 Hz and falls like 1/f at higher frequencies.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Frequency stabilization of a monolithic Nd:YAG ring laser by controlling the power of the laser-diode pump source

et al. 2000

View full text Add to dashboard Cite

The frequency of a 700 mW monolithic non-planar Nd:YAG ring laser (NPRO) depends with a large coupling coefficient (some MHz/mW) on the power of its laser-diode pump source. Using this effect we demonstrate the frequency stabilization of an NPRO to a frequency reference by feeding back to the current of its pump diodes.We achieved an error point frequency noise smaller than 1 mHz/ √ Hz, and simultaneously a reduction of the power noise of the NPRO by 10 dB without an additional power stabilization feed-back system. Due to the demanding requirements of recent experiments in quantum optics, laser spectroscopy and laser metrology there has been much interest in laser stabilization over the last years. Although very good stability was achieved with Ar + lasers 1 , diode-laser pumped solid-state lasers were chosen for almost all modern highprecision experiments. The reason for this choice is that the free-running frequency noise of these lasers is 2 to 3 orders of magnitude smaller than for Ar + lasers, and the intensity noise of solid-states-laser is also much lower. Furthermore, solid-state lasers have a very high electrical-to-optical efficiency, which is important especially in space applications like inter-satellite communication or high power applications as laser interferometric gravitational wave detectors.Many of these experiments rely on the high intrinsic stability of Nd:YAG non-planar ring oscillators (NPRO) 2 , the output of which is used in the experiment directly or is amplified either by injection locking [3][4][5] or in a configuration with master oscillator and power amplifier 6 . The free-running frequency noise spectral density of NPROs is of the order of 1 kHz/ √ Hz at 10 Hz and falls like 1/f at higher frequencies. The unstabilized power noise of such lasers has a level of 10 −7 / √ Hz. Although this intrinsic stability is quite high, experiments like gravitational wave detectors require a frequency stability in the mHz/ √ Hz range, and simultaneously the power noise needs to be reduced by at least an order of magnitude.The commonly used schemes to reduce the frequency noise of NPROs rely on stabilizing the laser frequency to a fixed-spacer reference cavity or an atomic resonance by feeding back to two different actuators: the temperature of the Nd:YAG crystal in the low Fourier frequency range below 1 Hz, and for higher frequencies to a piezoelectrical transducer (PZT) mounted on top of the crystal that changes the laser frequency due to stress-induced birefringence. The resonances of the PZT above 100 kHz limit the useful bandwidth of the latter actuator. Good results were achieved especially by using an additional external phase shifter (Pockels cell) as a fast actuator to increase the unity gain frequency of the feed-back control loop up to 1 MHz. For example Bondu et al.7 report a frequency noise spectral density below 10 −4 Hz/ √ Hz with respect to the reference cavity (in-loop) and in the order of 10 −2 Hz/ √ Hz with respect to an independent cavity (out-of-loop).Although these re...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Frequency stabilization of a monolithic Nd:YAG ring laser by controlling the power of the laser-diode pump source

et al. 2000

View full text Add to dashboard Cite

show abstract

“…Therefore amplification is required for a number of applications. Injection locking [10,11] or nonresonant amplification [12] in bulk amplifiers with a variety of geometries are demonstrated techniques to amplify single-frequency radiation up to several 10 W of output power, but suffering either from a complex electronic control for reliable operation, a sophisticated multicomponent optical setup or thermo-optical restrictions. Due to the properties of a rare-earth-doped fiber as gain medium the fiber based amplification of single-frequency radiation is an inherent simpler approach.…”

Section: Single-frequency Master-oscillator Fiber Power Amplifiermentioning

confidence: 99%

Power and energy scaling of fiber laser systems based on ytterbium-doped large-mode-area fibers

Limpert

Liem

Thomas

et al. 2003

Advances in Fiber Lasers

View full text Add to dashboard Cite

We review our recent work on fiber based laser systems in the continuous wave and nanosecond pulse regime. A significant power and energy scaling was possible by applying low-numerical aperture large-mode-area ytterbiumdoped double-clad fibers which emit an excellent beam quality and possess a reduced nonlinearity due to a mode field diameter of >20 µm. We report on a continuous wave fiber laser with an output power approaching 500 W from a single fiber and the amplification of ultrastable, narrow linewidth single-frequency radiation to the 100 W level with diffraction-limited beam quality without the limitation of nonlinear effects. Furthermore the amplification of nanosecond pulses to millijoule pulse energy and average powers up to 100 W is demonstrated.

show abstract

“…The field of the tilted master laser beam can be written [16]: (3) where is the tilt angle of the master laser beam. The field of the laterally displaced beam can be written (4) where is the lateral displacement.…”

Section: Modeling Of Tl For Injection-locked Lasersmentioning

confidence: 99%

Stabilization of injection-locked lasers using spatial mode interference

Ottaway

Gray

Shaddock

et al. 2001

IEEE J. Quantum Electron.

View full text Add to dashboard Cite

show abstract

Amplitude and frequency stability of a diode-pumped Nd:YAG laser operating at a single-frequency continuous-wave output power of 20 W

Abstract: Amplitude and frequency noise of an injection-locked diode-pumped Nd:YAG ring laser operating at a singlefrequency output power of 20 W cw are investigated. This laser system will be used as a light source for an interferometric gravitational-wave detector.

Cited by 46 publications

References 12 publications

Frequency stabilization of a monolithic Nd:YAG ring laser by controlling the power of the laser-diode pump source

Frequency stabilization of a monolithic Nd:YAG ring laser by controlling the power of the laser-diode pump source

Power and energy scaling of fiber laser systems based on ytterbium-doped large-mode-area fibers

Stabilization of injection-locked lasers using spatial mode interference

Contact Info

Product

Resources

About