Highly coherent modeless broadband semiconductor laser.

We report on the highly coherent modeless broadband continuous wave operation of a semiconductor vertical-external-cavity-surface-emitting laser. The laser design is based on a frequency-shifted-feedback scheme provided by an acousto-optic frequency shifter inserted in a linear or a ring traveling wave cavity. The gain mirror is a GaAs-based multiple quantum well structure providing large gain at 1.07 μm. This laser exhibits a coherent optical spectrum over 1.27 nm (330 GHz) bandwidth, with 70 mW output power and a high beam quality. The light polarization is linear (>30  dB extinction ratio). The laser dynamics exhibits a low intensity noise close to class A regime, with a ∼1.5  MHz cutoff frequency. The frequency noise spectral density shows a first-order low-pass like shape (130 kHz cutoff) leading to a Gaussian shape for homodyne interferometric signals. The measured beat width is ≃54  kHz and the coherence time of ∼19  μs. No nonlinear effects are observed, showing dynamics very close to theory.

[1]  Jean-Paul Pique,et al.  Efficient modeless laser for a mesospheric sodium laser guide star , 2003 .

[2]  I. R. Perry,et al.  Frequency shifted feedback and frequency comb generation in an Er3+ -doped fibre laser , 1994 .

[3]  Olivier Jacquin,et al.  The hypothesis of the moving comb in frequency shifted feedback lasers , 2011 .

[4]  L. P. Yatsenko,et al.  Ranging and interferometry with a frequency shifted feedback laser , 2004 .

[5]  L. P. Yatsenko,et al.  Theory of a frequency-shifted feedback laser , 2004 .

[6]  P. Hale,et al.  Broadband continuous-wave laser. , 1988, Optics letters.

[7]  Leonid P. Yatsenko,et al.  Coherence in the output spectrum of frequency shifted feedback lasers , 2009 .

[8]  Boualem Boashash,et al.  Estimating and interpreting the instantaneous frequency of a signal. I. Fundamentals , 1992, Proc. IEEE.

[9]  S. Schilt,et al.  Simple approach to the relation between laser frequency noise and laser line shape. , 2010, Applied optics.

[10]  Olivier Jacquin,et al.  Theory of Talbot lasers , 2013 .

[11]  B. Shore,et al.  Dynamics of frequency shifted feedback lasers: simulation studies. , 2003, Optics express.

[12]  I. Sagnes,et al.  Multiwatt-power highly-coherent compact single-frequency tunable vertical-external-cavity-surface-emitting-semiconductor-laser. , 2010, Optics express.

[13]  D. Romanini,et al.  Single-Frequency operation of External-Cavity VCSELs: Non-linear multimode temporal dynamics and quantum limit. , 2007, Optics express.

[14]  E. Brinkmeyer,et al.  Pulse generation in fiber lasers with frequency shifted feedback , 1994 .