Abstract
We report a broadly wavelength-tunable femtosecond diode-pumped Ti:sapphire laser, passively mode-locked using both semiconductor saturable absorber mirror (SESAM) and Kerr-lens mode-locking (KLM) techniques. Using two pump laser diodes (operating at 450 nm), an average output power as high as 433 mW is generated during mode-locking with the SESAM. A tunability range of 37 nm (788-825 nm) was achieved with the shortest pulse duration of 62 fs at 812 nm. In the KLM regime, an average output power as high as 382 mW, pulses as short as 54 fs, and a tunability of 120 nm (755-875 nm) are demonstrated.
Highlights
Over the past few decades Ti:sapphire lasers have become an invaluable tool covering a wide range of applications ranging from the industrial to applied and fundamental research [1,2,3,4]
This is mainly due to the pump source, which is typically a relatively complex and expensive diode-pumped solid state laser (DPSSL) or optically-pumped semiconductor laser (OPSL)
Direct diode pumping of Ti:sapphire was not a viable option, as the high intrinsic threshold and the presence of parasitic losses at higher doping concentrations dictated the use of a high brightness pump source with diffraction-limited beam quality
Summary
Over the past few decades Ti:sapphire lasers have become an invaluable tool covering a wide range of applications ranging from the industrial to applied and fundamental research [1,2,3,4]. Due to advances in GaN laser diodes emitting in the blue region of the spectrum (~420-450 nm), developed initially for the laser projector industry, the first continuous-wave, direct diode-pumped Ti:sapphire was demonstrated in 2009 by Roth et al [7] Building upon these results, they successfully realized mode-locking using a SESAM device, generating 114 fs pulses with 13 mW of average output power [8]. The first demonstration of a green diode-pumped Ti:sapphire laser was carried out by Sawai et al using a 518 nm diode with 1 W of output power [11] This SESAM-mode-locked Ti:sapphire laser produced 62 fs pulses with 23.5 mW of average output power.
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