The two most promising configurations for the LISA laser are a stand-alone diode-pumped nonplanar ring oscillator (NPRO) or a fibre amplifier seeded by a low-power NPRO. The stand-alone laser was stabilized in frequency to a ULE cavity and in power to an electronic reference. For the first time the LISA requirement of relative power noise below 2 × 10−4/Hz1/2 was fulfilled in the whole frequency range from 0.1 mHz to 1 Hz. The LISA goal of frequency noise below 30 Hz/Hz1/2 was achieved for frequencies above 3 mHz. As a first step in the characterization of an oscillator-amplifier system, the excess frequency noise of an ytterbium-doped fibre amplifier was measured. For frequencies between 0.1 mHz and 1 Hz the excess noise was measured to be below 0.1 Hz/Hz1/2, which is significantly below the free-running frequency noise of NPROs.

We demonstrate, for the first time to our knowledge, a longitudinally diode-pumped, monolithic ytterbium ion-doped YAG non-planar ring laser (NPRO). We achieved a continuous-wave (cw) single-frequency output power of 1 W with 45.0% slope efficiency and a beam quality factor of M(2)<1.1. In view of iodine frequency stabilization we have characterized the frequency tuning properties and have measured the relative intensity noise. Additionally, 6.1 mW second harmonic power at 515 nm was achieved using a periodically poled KTP crystal in a single-pass setup.

We have shown that pump light intensity stabilisation of a single-mode laser diode pumped Nd:YAG non-planar ring oscillator (NPRO) results in significant intensity noise reduction of the NPRO, as well as frequency noise suppression in the same order of magnitude. This effect does not occur in conventional laser diode array pumped NPROs due to mode beating effects originating in the multi-mode pump. As opposed to individual intensity and frequency stabilisation, pump light stabilisation contributes a simplified stabilisation scheme for single-mode laser diode pumped NPROs for high precision applications.

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text M. Hildebrandt, M. Frede, D. Kracht, I. Freitag, and P. Weßels, "Single-frequency fiber amplifier emitting 7.8 W at 1030 nm," in Advanced Solid-State Photonics, Technical Digest (Optica Publishing Group, 2006), paper MB6. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Non-resonant frequency conversion into the blue, green, orange, and red spectral regions is reported. Fundamental light sources were continuous-wave non-planar monolithic single-mode ring Nd: YAG lasers as well as a standing-wave multi-mode Nd: YAG laser. Periodically poled KTiOPO4 was employed as the nonlinear medium, but the considerations could also be applied to other periodically poled materials. A multi-pass scheme resulted in a normalized conversion efficiency as high as 27.2 % W-1 for frequency doubling in the small-signal regime at 1064 nm.

Recently, a simple common-path, two-color interferometer has been used for Doppler-free saturated dispersion spectroscopy of iodine. We have used such a set-up to stabilize a Nd:YAG laser for the first time, to our knowledge. This method requires only a small number of low-cost optical components compared to frequency modulation techniques.We have measured a root Allan variance of 5 . 10(-12) for 0.2 s, and below 5 . 10 (-11) for integration times up to 300 s.

This contribution summarizes recent progress in the development of diode-pumped Nd:YAG lasers suited for applications in laser-based metrology. Applying an unstable resonator design to a monolithic ring laser, 2 W single-frequency output power in a diffraction-limited beam is generated. Injection locking was used to increase the available power even further. Finally, techniques to improve the free-running lasers intensity and frequency stability are demonstrated. Low intensity noise is accomplished by application of an electronic feedback loop. Low frequency noise is achieved by stabilization onto a hyperfine transition of molecular iodine.

In this contribution, we report on the first demonstration of an nonplanar ring lasers (NPROs) at 1.053 /spl mu/m based on Nd:YLF as the active medium. Single-pass and resonant SHG results in ultrastable emission at 526.5 nm.

The development of a space qualifiable laser system based on a monolithic non-planar Nd:YAG ring laser is reported. Such a system can be used in a satellite-based measurement setup to measure wind velocities. (C) 2001 Optical Society of America.

We present beat measurements of two Nd:YAG lasers frequency-locked to thermally shielded room-temperature cavities. By suppressing convection, heat radiation, and heat conduction we reach lower beat-frequency drifts than are currently found in literature. (C) 2001 Optical Society of America.

We report on a compact approach to obtain single-frequency pulses with high average power at 266 nm. An amplified, passively Q-switched monolithic Nd:YAG ring laser was frequency quadrupled with periodically-poled KTP and BBO as nonlinear media. (C) 2000 Optical Society of America.

We demonstrate a compact ultraviolet light source based on frequency-converted diode-pumped passively Q-switched miniature Nd:yttrium–aluminum–garnet (YAG) ring lasers. A unique pulse-to-pulse stability in single-frequency operation is obtained by diffusion-bonding the Nd:YAG crystal with the Cr4+:YAG saturable absorber crystal to form an all-solid-state quasimonolithic ring laser cavity. Amplified in a longitudinally pumped Nd:vanadate (YVO4) crystal and single-pass frequency quadrupled in periodically poled potassium titanyl phosphate and barium borate crystals, an average output power of 485 mW at 266 nm with 25 μJ pulse energy is achieved with an overall efficiency of 3.3% with respect to the diode pump power.

We report a master-oscillator fiber power-amplifier system consisting of a diode-pumped monolithic nonplanar ring laser as the master oscillator and a Yb-doped large-mode-area double-clad fiber as the power amplifier. The system emits up to 20.1 W of single-frequency radiation at a wavelength of 1064 nm with diffraction-limited beam quality (M(2)=1.3) . The optical emission spectrum and amplitude-noise behavior are investigated. Furthermore, the power-scaling possibilities are discussed.

Ultra-violet single frequency pulses with high averagepower using frequency converted passively Q-switched quasi-monolithic Nd:YAGring lasers

Periodically poled KTiOPO4 for low thresholdparametric oscillation in the spectral range around 2.1 μm

Summary form only given. There is a high demand for ultrastable, ultra-violet single-frequency pulses in a large number of applications. Two examples are writing fiber Bragg gratings and LIDAR systems. Both applications need high average output power. However, a very compact approach to obtain single-frequency UV pulses has been realized, but the average output power was low. Other similar laser systems lead to sufficiently high average output power, but suffer from low pulse to pulse stability. We report on a laser system that combines the advantages of both of the previous laser systems, single-frequency operation and high average output power.