Spectral beam combining of a 980 nm tapered diode laser bar

Abstract

Abstract:We demonstrate spectral beam combining of a 980 nm tapered diode laser bar. The combined beam from 12 tapered emitters on the bar yielded an output power of 9.3 W at 30 A of operating current. An M 2 value of 5.3 has been achieved along the slow axis. This value is close to that of a free running single tapered emitter on the bar at the same current level. The overall spectral beam combining efficiency was measured to be 63%. ©2010 Optical Society of America

Power Amplification and Coherent Combination Techniques for Terahertz Quantum Cascade Lasers

“…The tapered resonant cavity has been widely adopted in near-infrared diodes [5][6][7][8] and midinfrared QCLs [9][10][11][12][13]. The introduction of the tapered region may affect the propagation of the fundamental mode of the light field, threshold current and output power of laser devices.…”

Power Scaling of Nonlinear Frequency Converted Tapered Diode Lasers for Biophotonics

“…simultaneous SHG and SFG Spectral beam combination of fiber lasers have been demonstrated with up to 5 lasers [97] and with diode lasers significantly more lasers have been combined [100]- [104]. If the wavelengths of these combined lasers are chosen properly, it is possible to obtain efficient frequency conversion of several lasers simultaneously and generation of light at a single wavelength can be achieved while operating the nonlinear crystal at a constant temperature.…”

16 W output power by high-efficient spectral beam combining of DBR-tapered diode lasers

“…In this context combining of a 100 emitter array reaching 35 W in pulsed mode at 915 nm with a beam quality of 1.4 was reported [20]. Vijayakumar et al demonstrated the first ever combining of a tapered diode laser bar reaching 9.3 W with a combining efficiency of 63% [21]. However, diode laser arrays have the disadvantage of mounting induced smiles, leading to a degradation of the beam quality even when the array consists of individual near diffraction limited emitters [20].…”

“…This also proofs the reliability of such gratings within a large power range. The increase in combining efficiency compared to the combining of diode laser arrays [21] might result from an increased flexibility in terms of optical alignments and adjustments of laser parameters.…”