scholarly journals Spectral Linewidth vs. Front Facet Reflectivity of 780 nm DFB Diode Lasers at High Optical Output Power

2018 ◽  
Vol 8 (7) ◽  
pp. 1104 ◽  
Author(s):  
Thanh-Phuong Nguyen ◽  
Hans Wenzel ◽  
Olaf Brox ◽  
Frank Bugge ◽  
Peter Ressel ◽  
...  
Keyword(s):  
Output Power ◽  
Diode Lasers ◽  
Substantial Reduction ◽  
Distributed Feedback ◽  
Optical Output ◽  
Spectral Linewidth ◽  
Facet Reflectivity ◽  
Simulation Results ◽  
Front Facet

The influence of the front facet reflectivity on the spectral linewidth of high power DFB (distributed feedback) diode lasers emitting at 780 nm has been investigated theoretically and experimentally. Characterization of lasers at various front facet reflections showed substantial reduction of the linewidth. This behavior is in reasonable agreement with simulation results. A minimum linewidth of 8 kHz was achieved at an output power of 85 mW with the laser featuring a front facet reflectivity of 30%. The device with a front facet reflectivity of 5% reached the same linewidth value at an output power of 290 mW.

scholarly journals Characterization of High-power DFB-MOPA Diode Lasers Emitting at 1064 nm

2019 ◽  
Vol 29 (1) ◽  
pp. 47
Author(s):  
Thanh-Phuong Nguyen
Keyword(s):  
Output Power ◽  
Laser Diode ◽  
High Power ◽  
Room Temperature ◽  
Beam Quality ◽  
Diode Lasers ◽  
Spectral Characteristics ◽  
Far Field ◽  
Optical Output

Detail characterization of the such laser diode is important for the applications. Electro-Optical and spectral characteristics of the high power 1064 nm DFB-MOPA lasers are investigated at room temperature as function of injection current. Beam quality is characterized by waist diameter and far-field divergence angle versus average optical output power. Beam propagation ratio M2 is defined at difference intensity levels from lateral beam profile giving more detail laser behaviors at high power.

High Output Power Operation of a 1.3 µm Gain-Coupled Distributed Feedback Laser with Narrow Spectral Linewidth

1999 ◽  
Vol 38 (Part 1, No. 2B) ◽  
pp. 1252-1255
Author(s):  
Yuichi Inaba ◽  
Masahiro Kito ◽  
Jun Ohya ◽  
Masato Ishino ◽  
Yasushi Matsui
Keyword(s):  
Output Power ◽  
Distributed Feedback ◽  
High Output Power ◽  
Distributed Feedback Laser ◽  
Spectral Linewidth ◽  
Power Operation ◽  
High Output

Distributed feedback 3.27 µm diode lasers with continuous‐wave output power above 15 mW at room temperature

2014 ◽  
Vol 50 (19) ◽  
pp. 1378-1380 ◽  
Author(s):  
R. Liang ◽  
T. Hosoda ◽  
L. Shterengas ◽  
A. Stein ◽  
M. Lu ◽  
...  
Keyword(s):  
Output Power ◽  
Room Temperature ◽  
Continuous Wave ◽  
Diode Lasers ◽  
Distributed Feedback ◽  
Continuous Wave Output Power

scholarly journals Characterization of Deleterious Mutations in Outcrossing Populations

Genetics ◽  
1998 ◽  
Vol 150 (2) ◽  
pp. 945-956 ◽  
Author(s):  
Hong-Wen Deng
Keyword(s):  
Genetic Variation ◽  
Genetic Variance ◽  
Estimation Bias ◽  
Deleterious Mutations ◽  
Environmental Variance ◽  
Higher Power ◽  
Sib Mating ◽  
The Mean ◽  
Simulation Results

Abstract Deng and Lynch recently proposed estimating the rate and effects of deleterious genomic mutations from changes in the mean and genetic variance of fitness upon selfing/outcrossing in outcrossing/highly selfing populations. The utility of our original estimation approach is limited in outcrossing populations, since selfing may not always be feasible. Here we extend the approach to any form of inbreeding in outcrossing populations. By simulations, the statistical properties of the estimation under a common form of inbreeding (sib mating) are investigated under a range of biologically plausible situations. The efficiencies of different degrees of inbreeding and two different experimental designs of estimation are also investigated. We found that estimation using the total genetic variation in the inbred generation is generally more efficient than employing the genetic variation among the mean of inbred families, and that higher degree of inbreeding employed in experiments yields higher power for estimation. The simulation results of the magnitude and direction of estimation bias under variable or epistatic mutation effects may provide a basis for accurate inferences of deleterious mutations. Simulations accounting for environmental variance of fitness suggest that, under full-sib mating, our extension can achieve reasonably well an estimation with sample sizes of only ∼2000-3000.

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