34 Questions 44 Answers 0 Followers
Questions related from Abbas N.
Hi all, I am using a CFBG with the following parameters: Center wavelength = 1035nm D = 0.372 ps/nm 3dB reflection bandwidth = 18nm For SMFs, D is given in the units of ps/nm.km, GDD is simply:...
06 June 2023 3,772 3 View
I have a laser with a spectral bandwidth of 19nm and is linearly chirped. The Fourier transform limit is ~82fs assuming a Gaussian profile. I have built a pulse compressor based on the available...
27 March 2023 145 2 View
I have built an f-2f interferometer. A dichroic mirror splits the supercontinuum into two arms of the Mechzehnder type f-2f interferometer. One arm (red) has a spectrum of 1150-1700nm which...
02 November 2022 2,748 6 View
I am using 3mm MgO: PPLN crystal and want to know its pump acceptance bandwidth. I want to calculate its pump acceptance bandwidth and am wondering if there is a simple way to calculate it
28 October 2022 1,118 2 View
Dear all, I am building and aligning mech Zehnder type f-2f interferometer for CEP signal detection. I have a few questions regarding this setup if someone could advise or comment? so, I have a...
10 August 2022 8,672 7 View
Hi , I want to monitor supercontinuum on OSA and for that purpose first I couple supercontinuum into SMF (PM-980) and other end to OSA. I am wondering since the loss is wavelength dependent and...
13 April 2022 9,308 5 View
I want to generate second harmonic using the long-wavelength (1600nm) part of the supercontinuum as pump. How to decide on choosing the right focal length lens for SHG. I am using 10mm-long...
10 December 2021 5,778 3 View
I have generated an octave-spanning supercontinuum (750-1700nm) using 140fs pulses. I want to frequency double longer wavelength (1600nm) using PPLN crystal. Since, I don't know what's the pulse...
19 August 2021 890 3 View
I want to generate second harmonic of 1600nm component from the octave-spanning supercontinuum to beat it with 800nm component and detect CEO signal. What are important specs on deciding an...
04 August 2021 6,499 2 View
What would be the pulse compression limit for initial pulses from fibre laser with average power 4mw, 4.5ps duration and 0.4nm fwhm bandwidth.After amplification to 450mw and propagating through...
05 March 2021 3,106 3 View
how to do f-2f interferometry from an octave spanning supercontinnum with frequency spacing 120MHz. Which would be the most suitable optical filter in this range for filtering f and 2f components...
13 October 2020 4,650 1 View
Is it possible to see current signal on oscilloscope. Since we can only see voltage signals directly on the oscilloscope. One way can be, to use a shunt resistor and look at the voltage signal...
30 June 2020 8,844 14 View
Consider the scenario, input pulse width and spectrum = 700fs/ 2.23nm (after propagating thru 20cm SMF) Output pulse width and spectrum become = 1.183 ps/ 38.357nm How to select a compressor...
10 June 2020 3,170 4 View
What type of PCF is ideal for coherent SC generation for carrier envelope offset measurement of a modelocked laser. As far as I know, for coherent SC generation, PCF should be pumped in normal...
15 March 2020 4,202 3 View
I am trying to couple light from Laser with M^2=1, wavelength = 1030nm and beam diameter = 1.3mm. Please suggest a lens for efficient coupling into PCF (say 2um core). As far as I know, I have two...
26 February 2020 8,139 8 View
In case of thin disk laser, what is the simplest and the most efficient way to couple laser light into photonic crystal fibre for super continnum generation. Thanks
11 February 2020 5,574 4 View
how to spliced different different core size (MFD) fibres ( single mode to graded index multimode). I am trying to splice SMF to GIMF, to fabricate SMF-GIMF-SMF saturable absorber. Although, I...
01 February 2020 4,334 6 View
I am trying to build a fiber laser based on multimode interference in SMF-GIMF-SMF (GIMF spliced between two SMFs) leading to saturable absorber phenomena in the design. I am using Er fiber as a...
02 July 2019 2,485 4 View
I am making a design where I have to splice PM single mode fiber to graded index multimode fiber, can it be possible with generic splicers or need some specialized one. what parameters should be...
17 June 2019 5,567 3 View
To achieve relatively simple locking ,what should be the values of FWHM for the laser to be locked and reference cavity, if side fringe lock to etalon transmission peak is desired? Thanks
16 November 2017 2,949 0 View
Is it possible to lock the laser to fabry perot interferometer resonance curve negative slope (at half power point) by electrical feedback of transmitted signal to laser drive current source.
14 September 2017 7,963 3 View
PDH is one method what are other options to achieve stable locking of of DFB-LD to scanning fabry perot etalon with FSR=1.5GHz and 3-dB BW=7.5MHz. I want to lock DFB-LD to FPE negative...
17 August 2017 3,802 1 View
how to measure DFB-LD frequency deviation per unit drive current change (in mA).
08 August 2017 462 3 View
I am trying to lock laser at half transmission point of scanning fabry perot etalon (SA200 ) using electrical feedback to laser driver current source.How can I achieve it. my experiment consists...
07 August 2017 4,730 3 View
I am working on a project where I need Absorption spectrum of common harmful gases.Is there any authentic reliable data which can be treated as reference. Many thanks!
05 July 2017 6,083 2 View
how to decide fiber length in Delayed self-heterodyne method of laser linewidth measurement.Some authors suggest 6X coherence length and some 10X coherence length and some even more... How to...
13 February 2017 9,402 3 View
I am doing an experiment in which I am using 2.5G APD TIA to detect optical signal.On its differential outputs I am getting data and data_bar=-24dBm and -26dBm resp. Which op-amp IC should I use...
02 January 2017 7,907 4 View
Please recommend differential amplifier with sensitivity (as low as -40dBm) and Gain above 20dB. Gain bandwidth from Dc to 1MHz? Thanks
23 December 2016 1,109 4 View
I want to lock DFB-LD spectrum (LW = 5MHz) inside etalon transmission peak using feedback mechanism for laser linewidth reduction and stabilization.How can achieve that goal ? What are the options...
10 November 2016 8,510 2 View
I want to feedback RF signal from photo detector which has SMA ouput connector to twin axial BNC jack (TWBNC) of current source external modulation port. How can I do that? I tried searching SMA...
07 November 2016 5,967 1 View
Anyone has experience of using LDX-3620 constant current source to drive DFB laser diode. DFB-LD is working fine on voltage source (1.5v, 22mA) but when I try to operate on current source ,it does...
21 October 2016 5,993 1 View
I am doing an experiment in which using fabry perot filter for laser stabilization.The system is highly dependent on the temperature variations of fabry perot filter.How can I stabilize FP filter...
05 September 2016 5,683 10 View
I am using Dual parallel mach zehnder modulator for generating initial seed comb lines. Using 50/50 coupler at output of DPMZM one arm of coupler is fed into low pi phase modulator. Using EDFA...
04 August 2016 5,788 3 View
What are the basis on which researchers choose mode-locked fiber laser to be ring or linear cavity. Apparently, mode-locked linear cavity fiber lasers seems to have simple, straightforward cavity...
01 January 1970 5,747 2 View
