Multi-wavelength surface emitting quantum cascade laser based on equivalent phase shift

Zhang, J. C.; Liu, F. Q.; Yao, Di; Wang, L. J.; Yan, Fang-Liang; Liu, J. Q.; Wang, Z. G.

doi:10.1063/1.4862649

Cited by 4 publications

(3 citation statements)

References 16 publications

(11 reference statements)

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“…For ensuring stable single-mode emission, similar to Ref. [13], we employed an EPS of quarter-wave (λ∕4), which makes the emission from the defect mode. The QCL core structure was grown on an n-InP substrate by solid-source molecular beam epitaxy (MBE), and the InP layers were grown by metal-organic chemical vapor deposition (MOCVD).…”

Section: Device Design and Fabricationmentioning

confidence: 99%

“…By altering the sampling periods in one chip, multi-wavelength QCL arrays can be achieved. To stabilize the lasing wavelength, equivalent phase shift (EPS) of quarter-wave (λ∕4) [12,13] and antireflection (AR) coating can be applied to enhance the side-mode-suppression ratio and prevent mode hopping. To improve the heat dissipation, epi-side-down bonding on patterned submount has also been utilized [14].…”

Section: Introductionmentioning

confidence: 99%

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Multi-wavelength sampled Bragg grating quantum cascade laser arrays

et al. 2018

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A multi-wavelength sampled Bragg grating (SBG) quantum cascade laser array operating between 7.32 and 7.85 μm is reported. The sampling grating structure, which can be analyzed as a conventional grating multiplied by a sampling function, is fabricated by holographic exposure combined with optical photolithography. The sampling grating period was varied from 8 to 32 μm, and different sampling order (−1st, −2nd, and −3rd order) modes were achieved. We propose that higher-order modes with optimized duty cycles can be used to take full advantage of the gain curve and improve the wavelength coverage of the SBG array, which will be beneficial to many applications.

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Section: Device Design and Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-wavelength sampled Bragg grating quantum cascade laser arrays

et al. 2018

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“…problem. A quarter-wave phase shift (λ/4 PS) (Shi et al 2014;Zhang et al 2014) was introduced, which can relieve the competition between the two band-edge modes, to make lasers work in defect mode. However, the fabrication of λ/4 PS can be quite complex and is also difficult to achieve accuracy.…”

mentioning

confidence: 99%

Stable single-mode 20-channel uniform buried grating DFB QCL array emitting at ~ 8.3 μm

Feng²,

Jia³

et al. 2022

Opt Quant Electron

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A 20-channel distributed feedback (DFB) quantum cascade laser (QCL) arrays based on uniform buried grating have been demonstrated. In pulsed mode, peak power reaches 80 mW and slope efficiency reaches 167 mW/A for 2.5-mm-long laser in the arrays at room temperature. The loss difference of two band-edge mode increases when reflectivity of the front facet becomes small, which prevents the mode hopping. The device shows linear tuning after the anti-reflectivity coating is deposited in the front facet, maintaining peak power of 64 mW. The whole chip covers a tuning range of 64 cm -1 , centering at 8.3 μm, with side-mode-suppression-ratio over 20 dB at room temperature. KeywordsQCL array • Uniform buried grating • Band-edge mode • Anti-reflectivity coating 1 Introduction Mid-infrared quantum cascade lasers (QCLs) are unipolar semiconductor lasers based on resonant tunneling and optical transitions within the conduction band of a multi-quantum well structure (Faist et al. 1994). There are various application including gas sensing (Kosterev et al. 2002), industrial process monitoring (Yao et al. 2012), spectroscopy (Namjou et al. 1998), and free space communication (Corrigan et al. 2009), which demands widely tunable and single-mode QCLs. External cavity (EC)-QCLs are broadly tunable light sources and have achieved a tunability of over 300 cm −1 (Centeno et al. 2014).However, the system is usually bulky and requires fine optical alignment. DFB-QCLs are compact with side-mode-suppression-ratio (SMSR) about 30 dB. Although a single DFB-QCL has a limited tuning range of a few cm −1 (~ 10 cm −1 ) via temperature tuning, we can still achieve wide tunability by fabricating a large amount lasers of different periods of gratings in one chip (Lee et al. 2009;Rauter et al. 2015). In this way, we can develop this tunable source called DFB-QCL arrays combining the advantages of external cavity and DFB devices, and DFB-QCL array has reached an impressive tunability above 230 cm −1 (Slivken et al. 2013).However, DFB-QCL arrays still have the problem of mode hopping which can be detrimental for this

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The progress of grating coupled surface emitting distributed feedback semiconductor lasers

Tian

Zou

et al. 2015

2015 International Conference on Optoelectronics and Microelectronics (ICOM)

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Multi-wavelength surface emitting quantum cascade laser based on equivalent phase shift

Cited by 4 publications

References 16 publications

Multi-wavelength sampled Bragg grating quantum cascade laser arrays

Multi-wavelength sampled Bragg grating quantum cascade laser arrays

Stable single-mode 20-channel uniform buried grating DFB QCL array emitting at ~ 8.3 μm

The progress of grating coupled surface emitting distributed feedback semiconductor lasers

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