- Three-dimensional force measurements in optical tweezers formed with high-NA micromirrors -
- Effect of aberration on height calibration in three-dimensional localization-based microscopy and particle tracking -
- Anarkisti kuvaa tähtiä Oulussa -
- Valley machining -
- A fiber-optic interferometer with subpicometer resolution for dc and low-frequency displacement measurement -
- Nano Nano Naaaano -
- Motion control of low-index microspheres in liquid based on optical repulsive force of a focused beam array -
- Fast two-dimensional standing-wave total-internal-reflection fluorescence microscopy using acousto-optic deflectors -
- Optical force model based on sequential ray tracing -
- 03/06/09 PHD comic: 'Clarity and depth' -
- STED microscopy reveals crystal colour centres with nanometric resolution -
- Experimental Insights: Miniature filters I -
- Ultrafast optics: Imaging and manipulating biological systems -
- ?/2 fringe-spacing interferometer -
- Absolute efficiency estimation of photon-number-resolving detectors using twin beams -
- White-light interference microscopy: minimization of spurious diffraction effects by geometric phase-shifting -
Author: admin
Ultra High Modulus
Ursa telescope meeting
On Saturday I presented (slides here) our mirror-making and Bath-interferometry project at the annual meeting of the telescope&equipment division of URSA (the finnish amateur astronomy association). The program included talks by Petri Kehusmaa on supernova-hunting and J-P Metsävainio on image-processing and creating 3D stereo images.
The event was held at Tähtikallio obsevatory in Artjärvi, a 90 minutes drive northeast from Helsinki. The site features three permanent domes, two of which have big telescopes installed in them. The smaller one is a 16-inch (406 mm) F/10 Meade LX200 (Schmidt-Cassegrain), and the big one is an Astrofox 36-inch (914 mm) folded Newtonian. Between the clouds and a lot of drift-alignment I managed to catch some nice views of Saturn and M13 through both of these scopes.
See also
Boston from the sea
Part of the excellent public transport in Boston is a boat from Long Wharf which goes south down to Quincy. A nice way of seeing Boston from the sea, and part of the islands outside the city.
Boston, Massachusetts
Pikanto plug painted
The parts of the plug have been glued together, painted, and sanded. We should be ready to lay up the moulds in a few weeks.
Links - March 6, 2009
Berlin pictures
Some Berlin pictures (the Charlottenburg palace and gardens) I found in my phone from two weeks ago.
Links - February 27, 2009
Finngulf 39 radio yacht
Markku Siivinen from Helsinki, Finland, has built two of these exquisitely detailed 1:10 Finngulf 39 scale models. Length 140 cm, height ca 180cm, beam 37 cm. They weigh about 9.5 kg of which 4 kg is in the keel.
