Self-frequency-doubling Yb:CNGS lasers operating in the femtosecond regime

Abstract

We study Yb:Ca 3 NbGa 3 Si 2 O 14 (Yb:CNGS) lasers in the mode-locked regime focusing on their self-frequency-doubling potential. We characterize the laser performance in configurations without and with phase-matching for second-harmonic generation. In the former case, the laser generates 47-fs pulses at a central wavelength of 1052 nm with an average output power of 45 mW at 78.4 MHz. These pulses are further compressed extracavity down to 40 fs, which indicates that the employed crystal is one of the most promising novel gain media regarding ultrafast laser operation. Furthermore, we demonstrate that in a configuration close to phase-matching the laser emits 40 mW of fundamental radiation at 1046 nm with 100-fs pulse duration simultaneously producing 66 mW of second-harmonic centered at 525 nm. In order to better describe the self-frequency-doubling phenomenon we compare our experimental observations obtained in both configurations with results of numerical modelling.

Dual‐Comb Femtosecond Solid‐State Laser with Inherent Polarization‐Multiplexing

“…The core of the system is the mode‐locked Yb:CNGS laser with a cavity design based on our previous works. [ 35,36 ] As a gain medium we used an antireflection (AR)‐coated 3 at% Yb:CNGS crystal with a length of 4 mm and an aperture of 3 × 3 mm 2 . It was pumped by a semiconductor laser diode delivering up to 1 W of 979.4 nm radiation at a maximum driving current of 1.7 A (3SP Technologies).…”

“…The experimental setup of our dual-comb spectrometer is shown in Figure 1. The core of the system is a mode-locked Yb:CNGS laser with a cavity design based on our previous works [28,29]. As a gain medium we used an antireflective (AR)-coated 3 at.% Yb:CNGS crystal with a length of 4 mm and an aperture of 3 × 3 mm 2 .…”

>10 kW peak power self-frequency doubling laser

“…An active Q-switching Tb:LiYF 4 laser that can directly emit 544 nm was successfully developed, which provided an average power of 445 mW and a peak pulse power of 580 W at a repetition rate of 3 kHz [11]. The other is to obtain pulsed green light using Nd 3+ or Yb 3+ doped laser crystals and frequencydoubling crystals [12][13][14][15]. Self-frequency doubling (SFD) crystals can complete two functions of laser emission and * Authors to whom any correspondence should be addressed.…”